Lumentum Holdings 10-K 2026-06-27

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

(Mark One)

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended June 27, 2026

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from

to

Commission File Number 001-36861

Lumentum Holdings Inc.

(Exact name of Registrant as specified in its charter)

1001 Ridder Park Drive, San Jose, California 95131

(Address of principal executive offices including Zip code)

(408) 546-5483

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

Yes ☒ No o

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes o No ☒

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See definition of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. o

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant was approximately $16,469 million, based on the closing sales price of the registrant’s common stock on December 26, 2025 (the last business day of the registrant’s most recently completed second fiscal quarter) of $390.77 per share, as reported on the Nasdaq Global Select Market. Shares of common stock held by officers, directors and holders of more than five percent of the outstanding common stock have been excluded from this calculation because such persons may be deemed to be affiliates.

As of August 14, 2026, the Registrant had 89.7 million shares of common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the information called for by Part III of this Annual Report on Form 10-K are hereby incorporated by reference from the definitive proxy statement for the registrant’s annual meeting of stockholders, which will be filed with the Securities and Exchange Commission not later than 120 days after the registrant’s fiscal year ended June 27, 2026.

FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K (this “Annual Report”) contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). These statements relate to, among other things, our markets and industry, products and strategy, the impact of export regulation changes, the expected benefits of our acquisitions, macroeconomic conditions, including supply chain conditions and inventory management by our customers, instability and uncertainty in the banking and financial services markets, and tightening credit markets on our business and results of operations, sales, gross margins, operating expenses, capital expenditures and requirements, liquidity, product development and research and development efforts, manufacturing plans, litigation, effective tax rates and tax reserves, our corporate and financial reporting structure, our plans for growth and innovation, our expectations regarding U.S.-China relations, international trade regulation and restrictions (including tariffs, duties, and export controls to be implemented by the U.S. and other countries), market and regulatory conditions, trends and uncertainties in our business and financial results, and are often identified by the use of words such as, but not limited to, “anticipate,” “believe,” “can,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “project,” “seek,” “should,” “target,” “will,” “would,” “contemplate,” “believe,” “predict,” “potential” and similar expressions or variations intended to identify forward-looking statements. These statements are based on the beliefs and assumptions of our management, which are in turn based on information currently available to management. Such forward-looking statements are subject to risks, uncertainties and other important factors that could cause actual results and the timing of certain events to differ materially from future results expressed or implied by such forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those discussed in the section entitled “Risk Factors” included under Part I, Item 1A of this Annual Report. Furthermore, such forward-looking statements speak only as of the date of this Annual Report. Except as required by law, we undertake no obligation to update any forward-looking statements to reflect events or circumstances after the date of such statements.

PART I

General

Overview

Lumentum Holdings Inc. (“we,” “us,” “our”, “Lumentum” or the “Company”) is a global leader in optical and photonic technologies and an industry-leading provider of optical and photonic products based on revenue and market share. Our products are essential to a range of cloud, artificial intelligence and machine learning (“AI/ML”), telecommunications, consumer, and industrial end-market applications. We operate in one reportable segment as a single, integrated enterprise. See “Note 17. Operating Segments and Geographic Information” to the consolidated financial statements.

We disaggregate revenue by type of product, which are Components and Systems, and by geography. A Components product is defined as one of the individual building blocks that goes into creating a larger solution. It is typically not a complete solution on its own but rather a specialized element that enables system functionality. This includes semiconductor laser chips, laser sub-assemblies, line subsystems and wavelength management systems. These are supplied to customers who then integrate them into their own full system solutions. Components represent foundational parts that support or enable that system’s operation and include optical chips and subsystems that are supplied to cloud data center operators, AI/ML infrastructure providers, and network equipment manufacturer customers.

A Systems product is defined as a complete, stand-alone solution that delivers full functionality to the end customer. It is typically self-contained and ready to operate within a customer’s network or application environment. This includes optical modules, optical circuit switches, and industrial lasers such as short-pulse solid-state lasers and kilowatt-class fiber lasers. These products integrate multiple technologies and subsystems into a finished solution that directly addresses a customer’s needs. A system represents the end-product that can be deployed and used independently.

Our products enable high-capacity optical links for cloud computing, AI/ML workloads, and data center interconnect (“DCI”) applications, as well as for communications service provider networks. Our offerings support access (local), metro (intracity), long-haul (intercity and global), and submarine (undersea) network infrastructure. Our products serve enterprise network infrastructure needs, including storage area networks (“SANs”), local area networks (“LANs”), and wide area networks (“WANs”). Demand for our products is fueled by the ongoing expansion of network capacity required to support cloud services, AI/ML processing, streaming video, video conferencing, wireless and mobile connectivity, and the internet of things (“IoT”). In addition, our industrial laser products are used for precision material processing across diverse industries, including semiconductor and microelectronics fabrication, electric vehicle and battery production, metal cutting and welding, and advanced manufacturing that emphasize greater manufacturing precision, flexibility, and sustainability.

We have a global footprint that enables us to address global market opportunities for our products with employees engaged in research and development (“R&D”), administration, manufacturing, support and sales and marketing activities in various locations worldwide. Our headquarters are located in San Jose, California, and we have manufacturing capabilities and facilities in North America, Asia-Pacific, and Europe.

Lumentum was incorporated in Delaware as a wholly owned subsidiary of JDS Uniphase Corporation (“JDSU”) on February 10, 2015. In August 2015, we were spun off from JDSU and became an independent publicly traded company through the distribution of our common stock by JDSU to its stockholders.

Since our spin-off from JDSU (now Viavi Solutions, Inc., or Viavi), we have completed a number of acquisitions, including Oclaro, Inc. (“Oclaro”) in 2018, NeoPhotonics Corporation and IPG Photonics’ telecom transmission product lines in 2022, and Cloud Light Technology Limited (“Cloud Light”) in 2023. These acquisitions have enhanced our product portfolio, broadened our revenue mix and strengthened our position to meet the evolving needs of our customers.

Our Industry

Our business is driven by end-market applications leveraging the performance advantages of advanced optical and photonic solutions. We operate within global markets characterized by robust, long-term growth trends that are increasing demand for our products and technologies.

The convergence of factors including the growing reliance on data transmission, the rapid adoption of AI/ML, and the increasing digitalization of society is driving expansion in cloud data centers and the demand for higher-bandwidth network solutions. Our products and technologies are at the forefront of these trends, engineered to support increased data volumes and computational loads while meeting the industry's need for advanced network capabilities.

Additionally, the manufacturing industry's pursuit of higher precision, innovative materials, and improved efficiency fuels demand for industrial laser-based solutions. Lumentum is well-positioned to capitalize on this trend through the provision of ultrafast lasers for micromachining and advanced material processing. In addition, we also produce laser emitters for 3D sensing applications in consumer electronics.

While we maintain a positive outlook on the long-term prospects for our products and technologies, we acknowledge the presence of industry and market risks and uncertainties, including fluctuations in supply and demand, that have led to volatility in our business and financial performance.

Industry Conditions

Through fiscal year 2024, we experienced significant fluctuations in demand as customers delayed projected shipments or built up inventory in response to supply shortages and then brought down inventories as supply chain constraints eased. Our revenue fluctuated in response to these changes in demand and our margins were adversely impacted as we were not able to fully recover costs, such as underutilized manufacturing capacity. However, beginning in the first quarter of fiscal year 2025, network equipment manufacturers normalized inventory levels; and since then, we have seen increasing demand from AI and cloud customers as they continue to expand their data centers, driven in part by the continued advances in cloud and AI infrastructure. This demand is outpacing our current supply which has required us to make decisions on supply allocation. We are investing in manufacturing capacity, both internally and with contract manufacturers, to meet demand.

Our supply chain is complex, and we need to manage supply of certain components required to build our products while confronted with fluctuating demand from our customers. From time to time, we experience logistics and supply chain issues and shortages of the types of components we and our customers require in our products, and when we experience these shortages, we have had to incur incremental supply and procurement costs in order to increase our ability to fulfill demands from our customers.

Due to worldwide operations, we and our customers are also subject to risks relating to the global trade environment. We are actively monitoring and assessing the global trade environment, particularly with respect to various proposed and enacted changes in tariff regulations and trade restrictions. The ongoing uncertainty surrounding trading policies, including the potential for additional tariffs, restrictions related to our customers and retaliatory measures by non-U.S. governments, continues to create a volatile environment that could disrupt our operations. The imposition of tariffs on certain imported goods and materials and export controls on critical components may increase our costs and place upward pressure on the cost of goods sold, which, in turn, may reduce our gross margins if we are unable to pass these costs onto customers through price increases.

For more information on risks associated with supply chain constraints and customer inventory, as well as tariffs and other trade restrictions, refer to Item 1A “Risk Factors” of this Annual Report.

Geopolitical Developments

As a global business with operations spanning diverse geographic regions, we are exposed to geopolitical risks. Fluctuations in the geopolitical landscape, including war, military conflicts, changes in export regulations, the effects of heightened, scheduled, or proposed tariffs, and shifts in national priorities and foreign relations policies, can significantly impact our business. For instance, modifications to trade restrictions and export regulations can adversely affect both product demand and our ability to supply customers, which would harm revenue and profit margins. Moreover, disruptions in our customers' supply chains due to geopolitical events could reduce or delay their demand for our products, ultimately impacting our revenue and operating results.

For more information on risks associated with the change in geopolitical landscape and regulatory actions, refer to Item 1A “Risk Factors” of this Annual Report.

Markets

We maintain leading market positions in our fast-growing optical networking markets through our extensive product and technology portfolio and close relationships with a wide range of market-leading customers. We provide a wide range of optical and photonic components, modules, and subsystems that support high-speed, high-capacity transmission of data over fiber optic links in cloud data centers, AI/ML, enterprise and communications services networking. Our customers include cloud and network service providers, AI infrastructure providers, and network equipment manufacturers (“NEMs”). Within data center and AI/M applications, our products enable high-speed interconnection across networked servers, AI accelerators, storage, and switches. Within communication service provider applications, our products support high-capacity access (local), metro (intracity), long-haul (city-to-city and worldwide) and submarine (undersea) optical networks.

Within the industrial market, our diode lasers serve as pump sources for high-power fiber lasers used in metal fabrication and other demanding applications. Our ultrafast lasers cater to industries such as printed circuit board manufacturing, semiconductor processing, electric vehicle battery production, solar cell production, and flat panel display fabrication, where precise micromachining is essential.

In the consumer electronics market, our laser light sources are integral components of 3D sensing cameras used in smartphones, computers, and other consumer electronics devices. These 3D sensing capabilities enable applications such as biometric identification, augmented and virtual reality, and computational photography.

Trends

The convergence of cloud computing and AI is driving rapid innovation and expansion in optical hardware for hyperscale operators. The immense computational demands of training and running AI models are shifting infrastructure from traditional copper interconnects to high-speed photonics. Concurrently, surging data traffic from video streaming, search engines, e-commerce, and cloud services continues to fuel the data center expansion.

Photonic solutions offer substantial advantages over copper connections, including ultra-fast, high-volume data transmission and reduced electromagnetic interference, enabling data traffic to continue to scale to accelerate AI model training and enhance high-performance computing (“HPC”) efficiency.

To address these challenges, web-scale companies are adopting distinct optical architectures:

• Scale-Out Optical Solutions: Optical hardware connects individual compute clusters, servers, and switches across the broader data center network to manage massive parallel workloads. This includes the adoption of 200G lane speed optical components that double data transfer rates compared to traditional 100G lanes.

• Scale-Up Optical Solutions: High-speed photonics and optical switches are deployed to directly cluster and interconnect GPUs and AI accelerators within the compute fabric, maximizing cluster efficiency and processing speeds.

• Scale-Across DCI Solutions: High-speed data center interconnects (“DCIs”) are constructed to enable seamless, low-latency data exchange across geographically dispersed data center units. This scale-across capability optimizes resource utilization by allowing cloud operators to leverage and balance computing power across multiple disparate locations.

The exponential growth of data across industries also drives the expansion of long-haul, metro, and access networks. Dense wavelength-division multiplexing (“DWDM”) technologies are being leveraged to increase data speeds while reducing costs. High-end networking equipment must now handle both legacy and internet protocol traffic while meeting stringent requirements for bandwidth, scalability, speed, reliability, compactness, and cost-effectiveness.

Further, the dynamic nature of network traffic demands agile optical networks that adapt to changing conditions. Technologies like Reconfigurable Optical Add-Drop Multiplexers (“ROADMs”), wavelength-selective switches, and tunable transmission products facilitate remote capacity adjustments. This need for capacity expansion across DCIs, metro regional networks, and long-haul networks is further accelerated by the widespread deployment of 5G mobile networks and bandwidth-intensive applications is increasing data speed at the network edge.

The industrial laser market is driven by the pursuit of precision and efficiency in material processing. Fiber lasers have surpassed gas lasers in sheet metal processing and welding due to their superior power, beam quality, power efficiency, and cost-effectiveness. This technology empowers manufacturers across metal fabrication, automotive, and electronics to produce smaller, lighter, and more functional products from advanced materials.

The trend toward miniaturization necessitates precise micromachining with minimal heat impact. Solid-state and ultrafast lasers excel in these tasks, replacing traditional tools for processes like creating vias in circuit boards and singulating wafers. Ultrafast lasers, with their exceptionally short pulses, are particularly adept at the delicate and precise micromachining required in semiconductor, display, solar cell, and EV battery production.

In the consumer market, laser light sources are integral to 3D sensors primarily used in mobile devices. This technology enables real-time depth perception, transforming image capture and granting devices the ability to perceive the world in three dimensions. Applications span biometric identification, computational photography, virtual and augmented reality, and natural user interfaces.

Offerings

Lumentum is a leading provider of high-speed optical transceivers and optical components underpinning modern AI and cloud computing applications. Optical transceivers and data interconnect solutions are essential for connecting servers, switches, and routers within data centers. We also manufacture key components used in optical transceivers and data interconnect solutions, including high-speed laser transmitters, photonic integrated circuits, and photodiodes, high-power laser light sources. For data center interconnects, Lumentum offers both its own coherent pluggable transceivers and the underlying ultra-narrow linewidth laser and coherent components used by transceiver customers.

Beyond standard offerings, we deliver customized solutions tailored to specific customer needs, such as high-power laser sources, compact laser arrays, and advanced packaging schemes enabling co-packaged optics and integrated photonics assemblies.

In metro and long-haul optical networks, Lumentum offers a comprehensive suite of coherent and direct-detect optical transmission components, modules, and optical transport solutions. Our tunable transceivers, transmitter modules, and high-speed coherent components are essential to DWDM systems maximizing fiber capacity and minimizing cost per bit.

For optical transport applications, we offer a broad range of products, including ROADMs, optical amplifiers, and optical channel monitors to efficiently switch, route, and condition optical signals. Our portfolio also includes pump lasers for optical amplifiers and passive components such as switches, attenuators, and wavelength-division multiplexing (WDM) systems. Beyond discrete components, we provide integrated modules, circuit packs, and subsystems for amplification, switching, and wavelength management. Additionally, our transport offerings include optical circuit switches for data center applications, helping to reduce power consumption and improve overall network efficiency.

We also offer a comprehensive range of industrial lasers to address diverse manufacturing needs. Our fiber lasers deliver kilowatt-class output power and excellent beam quality, making them ideal for sheet metal processing and general manufacturing applications. Additionally, high-power, solid-state and ultrafast lasers are used by manufacturers for precision machining tasks like drilling in printed circuit boards, wafer singulation, glass cutting, and solar cell scribing. Our 3D sensing products are primarily laser light sources, including higher-performance vertical-cavity surface-emitting lasers (VCSELs) and VCSEL arrays.

Strategy

In optical networking, we focus on technology leadership through innovation in close partnership with our customers, cost leadership and functional and vertical integration. We align the latest technologies with industry-leading, scalable manufacturing and operations to make us a valuable partner for cloud data center and network operators, AI/ML infrastructure providers, and NEMs. We aim to drive the next phase of data center infrastructure and communication data network scaling with technologies and products that are faster, more energy-efficient, more agile and more reliable.

Our commitment to innovation, particularly in photonic integration, drives the development of optical products that meet the evolving demands of data centers. Each product generation offers enhanced functionality, reduced size, lower power consumption, and improved cost-effectiveness. By providing a wide range of innovative optical solutions, from components to integrated modules to complete systems, we enable our customers to build the high-performance data center and communication networks of today and engineer those of the future.

In industrial lasers, we leverage our long-term relationships with OEM customers and our broad product and manufacturing technology portfolio to create innovative and valuable solutions that enable our customers to win in their markets.

Customers

During fiscal years 2026, 2025, and 2024, net revenue from a single end customer which represented 10% or more of our total net revenue of the applicable fiscal year is summarized in the table below:

International Operations

During fiscal years 2026, 2025 and 2024, net revenue from customers outside the United States based on the geographic region and country where our product is initially shipped to represented 79.2%, 81.0% and 73.8% of net revenue, respectively. Frequently, customers request shipment of our products to their factories, contract manufacturer factories, or other locations in countries that differ from their headquarter location (which in many cases is in the U.S.). Our net revenue is primarily denominated in U.S. dollars, including our net revenue from customers outside the United States based on customer shipment locations as described above. Refer to “Note 17. Operating Segments and Geographic Information” to the consolidated financial statements. For information regarding risks associated with our international operations, refer to Item 1A “Risk Factors” of this Annual Report.

Backlog

Due to possible changes in product delivery schedules and cancellation of product orders, and because our sales often reflect orders shipped in the same quarter in which they are received, our backlog at any particular date is not necessarily indicative of actual revenue or the level of orders for any succeeding period.

Competition

We compete against various public and private companies providing photonic components, modules, and systems. Some of these competitors are also our customers for certain of our products.

Seasonality

Our revenue may be influenced on a quarter-to-quarter basis by customer demand patterns and new product introductions. Some of our products may be incorporated into consumer electronic products, which are subject to seasonality and fluctuations in demand.

Mergers and Acquisitions

We evaluate strategic opportunities regularly and, where appropriate, have acquired and expect to acquire in the future, additional businesses, products, or technologies that are complementary to, or broaden the markets for our products. We believe we have strengthened our business model by expanding our addressable markets, customer base and expertise, diversifying our product portfolio and fortifying our core businesses through acquisitions as well as through organic initiatives.

Refer to “General - Overview” above and “Note 4. Business Combination” to the consolidated financial statements for additional information.

Research and Development

We devote substantial resources to research and development (“R&D”) for the development of new and enhanced products to serve our current markets and attractive new markets for our technology. We also expend significant engineering resources to enhance both product performance and our ability to manufacture products in greater volume and at lower cost.

We are maintaining our capability to provide leading products throughout the network, while focusing on several important sub-segments. We are making significant investments in next generation optical components for cloud data center and AI/ML applications, including higher speed and higher optical power laser chips for use in high-speed datacom transceivers and data interconnection solutions. We are also investing in the development of new high-speed optical transceiver modules for use in cloud data center, AI/ML, and DCI applications. In addition, we are investing in the emerging optical circuit switching market to enable direct data transmission between fiber optic cables in data centers within the optical plane. We continue to invest in research and development to develop innovative components and modules for telecommunications networks, such as higher capacity ROADMs and tunable laser and coherent components and transceiver modules needed for long-haul and metro applications. We are also responding to market needs for higher levels of integration, including the integration of optics, electronics and software in our modules, subsystems and circuit packs. We continue to develop new solid-state, fiber, and ultrafast short pulse lasers that leverage our technologies. These products are targeted at serving customers engaging in the semiconductor device, solar cell, display, and electric vehicle and battery manufacturing markets as well as broader materials processing and precision micromachining end-markets. We also continue to develop new and enhanced laser diode products with higher performance and efficiency at lower cost, primarily for the consumer end-market.

Intellectual Property

Intellectual property rights that apply to our various products include patents, trade secrets and trademarks. We do not intend to broadly license our intellectual property rights unless we can obtain adequate consideration or enter into acceptable patent cross-license agreements. As of June 27, 2026, we owned approximately 1,000 U.S. patents and 900 foreign patents with expiration dates through 2046 and had approximately 670 patent applications pending throughout the world.

Manufacturing

We use a combination of our own wafer fabrication facilities, or wafer fabs, assembly and test facilities, as well as third-party contract manufacturers to produce our products. Our significant manufacturing facilities are located in the United States, Thailand, China, the United Kingdom, Slovenia, and Japan.

We expanded our manufacturing footprint through our various acquisitions, and in 2026, we continued to add to our footprint by acquiring a manufacturing facility in Greensboro, North Carolina. We have undertaken various initiatives to consolidate and restructure certain of our manufacturing and operational sites, particularly in light of efficiencies and synergies achievable from prior acquisitions, while also expanding overall manufacturing capacity for new and high growth product lines across our global manufacturing footprint.

Our significant contract manufacturing partners are located primarily in Thailand, Taiwan, Malaysia and the Philippines. We rely on the capabilities of our contract manufacturers to plan and procure components and manage the inventory in these locations.

Sources and Availability of Raw Materials

We use various suppliers and contract manufacturers to supply parts and components for manufacturing and support of multiple product lines. Although our intention is to establish at least two sources of supply for materials whenever possible, for certain components we have sole or limited source supply arrangements. We may not be able to procure these components from alternate sources at acceptable prices and quality within a reasonable time, or at all, therefore, the risk of loss or interruption of such supply could impact our ability to deliver certain products on a timely basis. Risks associated with reliance on third parties for the timely and reliable delivery of raw materials are discussed in greater detail in Item 1A “Risk Factors” of this Annual Report.

Human Capital Resources

As of June 27, 2026, we employed approximately 13,757 full-time employees, including approximately 11,916 employees in manufacturing, 1,085 employees in R&D and 756 employees in SG&A. Of the 13,757 employees, approximately 1% are represented by two national collective bargaining agreements with local chapters in Slovenia and two labor unions in China. We believe that our relations with both our union and non-union employees are in good standing.

We believe that our future performance relies on the strength of our employees, and our ability to recruit, retain, develop and motivate the services of executive, engineering, sales and marketing, and support personnel is critical to our success. We strive to meet these objectives by offering competitive pay and benefits in a diverse, inclusive and safe workplace and by providing opportunities for our employees to grow and develop their careers.

Competitive Pay and Benefits

We provide compensation and benefits packages that we believe are competitive within the applicable market. We use a combination of compensation and other programs (which vary by region and salary grade) to attract, motivate and retain our employees, including semi-annual or annual performance bonuses, stock awards, an employee stock purchase plan, health savings and flexible spending accounts, paid time off, family leave, tuition assistance programs, health and wellness benefits and programs. We review our benefits packages annually, or more frequently as needed, to ensure we remain competitive with our peers and continue to attract and retain talent throughout our organization.

Employee Recruitment, Retention and Development

We are committed to recruiting, hiring, retaining, promoting and engaging a global, diverse workforce to best serve our global customers, suppliers, and partners. We have established relationships with professional associations and industry groups to proactively attract talent, and we partner with universities for our internship program. We believe that our commitment to our internship program and university partnerships contributes to developing the next generation of talent and provides a pipeline of recent college graduates into our talent pool.

Material Government Regulations

Our business activities are international and subject us to various federal, state, local and foreign laws in the countries in which we operate, and our products and services are subject to certain laws and regulations affecting the sale of our products.

Environment

Our R&D, manufacturing and distribution operations involve the use of hazardous substances and are regulated under international, federal, state and local laws governing health and safety and the environment. We apply strict standards for protection of the environment and occupational health and safety to sites inside and outside the United States, even if not subject to regulation imposed by foreign governments. We believe that our properties and operations at our facilities comply in all material respects with applicable environmental laws and occupational health and safety laws. However, the risk of environmental liabilities cannot be completely eliminated, and there can be no assurance that the application of environmental and health and safety laws will not require us to incur significant expenditures. We are also regulated under a number of international, federal, state and local laws regarding recycling, product packaging and product content requirements. The environmental, product content/disposal and recycling laws are gradually becoming more stringent and may cause us to incur significant expenditures in the future.

In connection with our separation from JDSU and trading as an independent public company in 2015, we agreed to indemnify Viavi for any liability associated with contamination from past operations at all properties transferred to us from Viavi, to the extent the resulting issues primarily related to our business. We have not been presented with any claims to date.

Global Trade and Export Controls

As a global business, we operate in many jurisdictions and our products and services are subject to diverse and evolving import and export laws, including international treaties, U.S. export controls and sanctions, customs regulations, and local trade laws. These regulations may delay product launches, restrict our operations in certain regions, or limit dealings with specific entities or individuals, particularly where sensitive or controlled technology is involved. For instance, the U.S. and other governments have imposed restrictions on certain semiconductors and telecommunications products and components, which limit both sales of our products and our access to product components. At the same time, noncompliance with these trade regulations could significantly hinder our ability to operate in some markets or serve particular customers.

For additional information concerning regulatory compliance and a discussion of the risks associated with governmental regulations that may materially impact us, refer to Item 1A “Risk Factors” of this Annual Report.

Available Information

Our website is located at www.lumentum.com, and our investor relations website is located at http://investor.lumentum.com. Copies of our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to these reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act, as amended, are available free of charge on our investor relations website as soon as reasonably practicable after we file such material electronically with or furnish it to the Securities and Exchange Commission (the “SEC”). The SEC also maintains a website that contains our SEC filings at www.sec.gov.

Investors and others should note that we routinely use the Investors section of our website to announce material information to investors and the marketplace. While not all of the information that we post on our corporate website is of a material nature, some information could be deemed to be material. Accordingly, we encourage investors, the media and others interested in us to review the information that we share on www.lumentum.com. Information in, or that can be accessed through, our website is not incorporated into this Form 10-K.

Investing in our common stock involves a high degree of risk. You should carefully consider the risks and uncertainties described below, together with all of the other information in this Annual Report on Form 10-K, including the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and related notes, before making a decision to invest in our common stock. Our business, financial condition, results of operations or prospects could also be harmed by risks and uncertainties not currently known to us or that we currently do not believe are material. If any of the risks actually occur, our business, financial condition, results of operations and prospects could be adversely affected. In that event, the market price of our common stock could decline, and you could lose part or all of your investment.

Risk Factor Summary

Our business operations are subject to numerous risks, factors and uncertainties, including those outside of our control, which could cause our actual results to be harmed, including risks regarding the following:

Risks Related to our Business

• unfavorable economic and market conditions, including trade restrictions, export control laws and customs regulations, and tariffs;

• our reliance on a limited number of suppliers and customers;

• order cancellations, reductions or delays in delivery schedules by our customers or distributors;

• failure of banking institutions and liquidity concerns at other financial institutions;

• our backlog may not be an accurate indicator of our level and timing of future revenue;

• our gross margins and operating margins may vary over time;

• challenges relating to supply chain constraints;

• changes in technology and intense competition;

• our ability to sell to a significant customer;

• higher tariffs and other trade restrictions between the U.S. and other countries, including China and Thailand;

• the impact of a widespread health crisis;

• our international operations structure;

• volatility and maintenance of our real property portfolio;

• our ability to timely procure components needed to manufacture our products;

• our ability to manufacture our products;

• our leverage in negotiations with large customers;

• design and manufacturing defects or quality issues in our products;

• our ability to timely adapt to changes in laws, regulations, administrative procedures and regulators’ expectations, including those related to U.S. and international import laws and export controls;

• our strategic transactions and implementation strategy for our acquisitions;

• restructuring and related charges;

• changes in spending levels, demand and customer requirements for our products;

• changes in tax laws;

• fluctuations in foreign currency;

• our future capital requirements;

• actual or perceived security or privacy breaches or incidents, as well as defects, errors or vulnerabilities in our technology and that of third-party providers;

• the failure or absence of business continuity plans with respect to our global facilities and operations;

• the unpredictability of our results of operations;

• our ability to protect our product and proprietary rights;

• factors relating to our intellectual property rights as well as the intellectual property rights of others;

• actions taken by suppliers, customers and authorized or unauthorized resellers or distributors that adversely affect our reputation or violate import or export regulations;

• litigation risks, including intellectual property litigation;

• our reliance on licensed third-party technology; and

• our ability to maintain an effective system of disclosure controls and internal control over financial reporting

Risks Related to Our Indebtedness

• our ability to service our current and future debt; and

• our current and future indebtedness, which may limit our operating flexibility or otherwise affect our business

Risks Related to Human Capital

• our ability to hire and retain key personnel;

• the effects of immigration policy on our ability to hire and retain employees; and

• employment related disputes and claims

Risks Related to Legal, Regulatory and Compliance

• our ability to obtain government authorization to export our products; and

• changes in social and environmental responsibility regulations, policies and provisions, as well as government, customer, business partner, investor or other stakeholder demands

Risks Related to Our Common Stock

• the volatility of the trading price of our common stock;

• dilution related to our convertible notes;

• our intention not to pay dividends for the foreseeable future;

• provisions of Delaware law and our certificate of incorporation and bylaws that may make a merger, tender offer or proxy contest difficult;

• exclusive forum provisions in our bylaws;

• the potential impact of the hedging activity of the 2032 Capped Call Counterparties on the market price of our common stock; and

• counterparty risk with respect to the 2032 Capped Call Options

Risks Related to Our Business

Our operating results may be adversely affected by unfavorable changes in macroeconomics and market conditions and the uncertain geopolitical environment.

Our business and operating results depend significantly on general market and economic conditions. The current global macroeconomic environment is volatile and continues to be significantly and adversely impacted by inflation and a dynamic demand environment. Additionally, instability in the global credit and banking markets, inflation, trade wars, disputes and tariffs, capital expenditure reductions, unemployment, stock market volatility, armed conflicts and geopolitical tensions in many parts of the world (including as a result of the on-going Russia-Ukraine war, ongoing conflicts in the Middle East, including the U.S.-Iran war, political and territorial conflicts in the Western Hemisphere, the conflict between Cambodia and Thailand, and China-Taiwan relations), economic challenges in China and the U.S., including global economic ramifications of Chinese and U.S. economic difficulties, and other disruptions may continue to put pressure on global economic conditions. Further, conditions in the global economy have an inherent degree of uncertainty. As a result, it is difficult to estimate the level of growth or contraction of the global economy as a whole. It is even more difficult to estimate growth or contraction in various parts, sectors, and regions of the economy, including the markets in which we participate. All aspects of our forecasts depend on estimates of growth or contraction in the markets we serve.

Adverse changes to and uncertainty in the global economy have affected industries in which our customers operate and have resulted in decreases in the rate of demand, consumption or use of certain of our customers’ products which, in turn, have resulted in, and may in the future result in, decreased demand for our products, revenue fluctuations, increased price competition for our products, and increased the risk of excess and obsolete inventories as well as higher overhead costs as a percentage of revenue. For example, customers who had built up large inventories when supply chains were tight related to the COVID-19 pandemic brought down inventories as supply constraints eased and, in some cases, these customers delayed projected shipments, which harmed our revenue and profitability. These conditions may recur in the future, and similar losses or delays may harm our results of operations. The impact of economic challenges on the global financial markets could negatively impact our operations by affecting the solvency of our customers, the solvency of our key suppliers or the ability of our customers to obtain credit to finance purchases of our products. Further, supply chain disruptions have led and may contin

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None.

Risk Management and Strategy

Cybersecurity risk management is an important part of and is integrated into our overall enterprise risk management framework, with cybersecurity risks being among the core enterprise risks identified for oversight by our Board of Directors (the “Board”) through our annual enterprise risk assessment. We maintain an enterprise-wide cybersecurity risk assessment program and framework that is designed to identify, assess, and manage cybersecurity risk, vulnerabilities, and threats. The foundation of our cybersecurity program is based on the National Institute of Standards and Technology ("NIST") Cybersecurity Framework and complies with the International Organization for Standardization (“ISO”) 27001:2022 standard. In alignment with the concepts and principles articulated in these standards, we have implemented controls related to cybersecurity threats and incidents including monitoring, log collection and analysis, threat hunting and intelligence surveillance, and regular vulnerability scans/penetration tests. Additionally, in furtherance of assessing, identifying, and managing material cybersecurity risks, we:

• Leverage technology solutions designed to provide protection for our assets and detect threats in our environment;

• Perform regular vulnerability assessments and penetration testing in efforts to identify, assess, and remediate weaknesses;

• Maintain an enterprise-wide disaster recovery governance program;

• Regularly perform cybersecurity-related disaster recovery testing designed to ensure that our mission-critical IT systems are recoverable, in support of our business continuity needs; and

• Work with each of our business and corporate groups with our internal cybersecurity program to integrate cybersecurity requirements into operating environments as appropriate. In addition, executive management, as well as our Board, regularly review our financial planning processes for these areas, inclusive of our cybersecurity programs.

Changes or additions to our cybersecurity risk assessment program and related practices and procedures described above in response to cybersecurity needs are reviewed by our Cybersecurity Steering Committee (“CSC”), an executive management-level cross-functional group.

We regularly engage independent third parties to assess the effectiveness of our cybersecurity program and practices and to assist with risk mitigation. These assessments are performed in conformance with ISO standards and requirements. Enhancements to our cybersecurity program and practices are identified from assessment findings, and if deemed appropriate, implemented.

In addition, we evaluate the security posture and features of critical vendors and suppliers. This includes reviewing and monitoring of the third party controls, to help ensure third party services meet our standards for such providers and that the cybersecurity risks associated with the use of these services are appropriate.

For additional information regarding whether any risks from cybersecurity threats are reasonably likely to materially affect our company, including our business strategy, results of operations, or financial condition, please refer to Item 1A, “Risk Factors - Any failure, disruption or security breach or incident of or impacting our information technology infrastructure or information management systems could have an adverse impact on our business and operations.” We believe that risks from prior cybersecurity threats, including as a result of any previous cybersecurity incidents, have not materially affected our business to date. However, we can provide no assurance that there will not be incidents in the future or that they will not materially affect us, including our business strategy, results of operations, or financial condition.

Governance

Our Board oversees our enterprise risk management program and practices, and the Audit Committee assists the Board in its oversight of cybersecurity matters. Quarterly updates are presented to our Audit Committee by our Chief Information Security Officer (“CISO”) on cybersecurity risks and threats. In addition, our Audit Committee provides Board-level oversight for management’s actions with respect to practices, procedures and controls used to identify, assess, and manage our key cybersecurity programs and risks, and, as necessary, responses to any significant cybersecurity incidents.

Our cybersecurity program is led by our CISO, who manages a team of cybersecurity professionals. Our CISO has over 20 years of experience in cybersecurity and technology, including as a CISO at another public company. Members of our cybersecurity team, combined, have over 80 years of cybersecurity experience and members of the team hold various professional certifications.

As noted above, we also maintain a CSC, which consists of our Vice President IT - Chief Information Security Officer (CISO), Chief Executive Officer, Executive Vice President - Chief Financial Officer, Senior Vice President - Chief Human Resources Officer, Senior Vice President - General Counsel, Executive Vice President - Chief Transformation Officer, Senior Vice President - Global Fabs, Senior Vice President - Manufacturing Operations, Group Vice President - Chief Information Officer (CIO), and Vice President - Internal Audit. The CSC has the primary responsibility to monitor and manage existing and emerging cybersecurity risks. The CSC provides oversight of cybersecurity initiatives within Lumentum and is responsible for integrating cybersecurity risk management practices with critical business processes to help ensure that cybersecurity is appropriately addressed throughout Lumentum.

We own and lease various properties in the United States and eleven other countries around the world. We use the properties for executive and administrative offices, product development offices, customer service offices and manufacturing facilities. Our current corporate headquarters, which we own, is approximately 124,000 square feet and located in San Jose, California. As of June 27, 2026, our leased and owned properties in total are approximately 3,100,000 square feet, of which we own approximately 2,136,000 square feet, including the 1,173,000 square feet manufacturing sites in Thailand, the 183,000 square feet manufacturing site in the United Kingdom, the 148,000 square feet manufacturing site in Greensboro, North Carolina, the 124,000 square feet on the San Jose campus, the 472,000 square feet manufacturing and R&D site in Japan, and the 36,000 square feet manufacturing and R&D sites in Slovenia. Leased sites include properties located in Canada, China, Hong Kong, Italy, Japan, Switzerland, Taiwan, the United States, and South Korea. We believe our existing properties, including both owned and leased sites, are in good condition and suitable for the conduct of our business.

From time-to-time we consider various alternatives related to our long-term facilities’ needs. While we believe our existing facilities are adequate to meet our immediate needs, it may become necessary to lease, acquire, or sell additional or alternative space to accommodate future business needs. In March 2026, we acquired a manufacturing facility in Greensboro, North Carolina, which mainly included land, building, machinery and equipment. In March 2026, we also completed the sale of two commercial real estate properties located in San Jose, California. The properties consist of commercial buildings used by us for administrative, research and development and manufacturing support activities. In March 2025, we completed a transaction to sell the land and building of a 250,000 square feet manufacturing facility located in Shenzhen, China. In July 2024, we completed a transaction to purchase the land and building of our wafer fabrication facility located in Sagamihara, Japan. Our lease of the building at the premises was terminated as a result of the purchase.

We are subject to a variety of claims and suits that arise from time-to-time in the ordinary course of our business. As such, we regularly evaluate developments in legal matters that could affect the amount of the previously accrued liability and record adjustments as appropriate. While management currently believes that resolving claims against us, individually or in the aggregate, will not have a material adverse impact on our financial position, results of operations or cash flows, these matters are subject to inherent uncertainties and management’s view of these matters may change in the future. Should we experience an unfavorable final outcome, there exists the possibility of a material adverse impact on our financial position, results of operations or cash flows for the period in which the effect becomes reasonably estimable. For a description of our material pending legal proceedings, refer to “Note 16. Commitments and Contingencies” to the consolidated financial statements.

None.

PART II

Our common stock trades on the Nasdaq Global Select Market under the symbol “LITE”. According to records of our transfer agent, we had 1,657 stockholders of record as of August 14, 2026, and we believe there is a substantially greater number of beneficial holders.

We do not expect to pay cash dividends on our common stock in the foreseeable future.

Stock Performance Graph

This performance graph shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the Exchange Act), or incorporated by reference into any filing of Lumentum Holdings Inc. under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

The following graph compares the cumulative total return of our common stock with the total return for the Nasdaq Composite Index (the “IXIC”) and the Nasdaq 100 Technology Sector Index (the “NDXT”) from market close on July 2, 2021 (the last trading day before the beginning of our fifth preceding fiscal year) through June 27, 2026. The stock price performance on the following graph is not necessarily indicative of future stock price performance.

Recent Sale of Unregistered Equity Securities

None.

Issuer Purchases of Equity Securities

None.

You should read the following discussion in conjunction with the audited consolidated financial statements and the corresponding notes included elsewhere in this Annual Report. This Management’s Discussion and Analysis of Financial Condition and Results of Operations contains forward-looking statements. The matters discussed in these forward-looking statements are subject to risk, uncertainties and other factors that could cause actual results to differ materially from those made, projected or implied in the forward-looking statements. Refer to “Risk Factors” and “Forward-Looking Statements” for a discussion of the uncertainties, risks and assumptions associated with these statements.

Overview

We are a global leader in optical and photonic technologies and an industry-leading provider of optical and photonic products based on revenue and market share. Our products are essential to a range of cloud, artificial intelligence and machine learning (“AI/ML”), telecommunications, consumer, and industrial end-market applications.

We believe the global markets in which Lumentum participates have fundamentally robust, long-term trends that will increase the need for our photonics products and technologies. We believe the world is becoming more reliant on ever-increasing amounts of data flowing through optical networks and data centers. Lumentum’s products and technology enable the scaling of these optical networks and data centers to higher capacities. AI/ML has caused a dramatic surge in the growing demands on data networking in cloud data centers and accelerated the usage of optical components and modules. We expect that the accelerating shift to digital and virtual approaches to many aspects of work and life will continue into the future. Virtual meetings, video calls, and hybrid in-person and virtual environments for work and other aspects of life will continue to drive strong needs for bandwidth growth and present dynamic new challenges that our technologies address. As manufacturers demand higher levels of precision, new materials, and factory and energy efficiency, suppliers of manufacturing tools globally are turning to laser-based approaches, including the types of lasers Lumentum supplies. Laser-based 3D sensing and LiDAR for security, industrial and automotive applications are rapidly developing markets. The technology enables computer vision applications that enhance security, safety, and new functionality in the electronic devices that people rely on every day. The use of LiDAR and in-cabin 3D sensing in automobile and delivery vehicles will over time significantly add to our long-term market opportunity.

To maintain and grow our market and technology leadership positions, we are continually investing in new and differentiated products and technologies and customer programs that address both nearer-term and longer-term growth opportunities, both organically and through acquisitions, as well as continually improving and optimizing our operations. Over many years, we have developed close relationships with market-leading customers. We seek to use our core optical and photonic technologies and our volume manufacturing capability to expand into attractive emerging markets that benefit from advantages that optical or photonics-based solutions provide.

We disaggregate revenue by type of product, which are Components and Systems, and by geography. A Components product is defined as one of the individual building blocks that goes into creating a larger solution. It is typically not a complete solution on its own but rather a specialized element that enables system functionality. This includes semiconductor laser chips, laser sub-assemblies, line subsystems and wavelength management systems. These are supplied to customers who then integrate them into their own full system solutions. Components represent foundational parts that support or enable that system’s operation and include optical chips and subsystems that are supplied to cloud data center operators, AI/ML infrastructure providers, and network equipment manufacturer customers.

A Systems product is defined as a complete, stand-alone solution that delivers full functionality to the end customer. It is typically self-contained and ready to operate within a customer’s network or application environment. This includes optical modules, optical circuit switches, and industrial lasers such as short-pulse solid-state lasers and kilowatt-class fiber lasers. These products integrate multiple technologies and subsystems into a finished solution that directly addresses a customer’s needs. A system represents the end-product that can be deployed and used independently.

Our products enable high-capacity optical links for cloud computing, AI/ML workloads, and data center interconnect (“DCI”) applications, as well as for communications service provider networks. Our offerings support access (local), metro (intracity), long-haul (intercity and global), and submarine (undersea) network infrastructure. Our products serve enterprise network infrastructure needs, including storage area networks (“SANs”), local area networks (“LANs”), and wide area networks (“WANs”). Demand for our products is fueled by the ongoing expansion of network capacity required to support cloud services, AI/ML processing, streaming video, video conferencing, wireless and mobile connectivity, and the internet of things (“IoT”). In addition, our industrial laser products are used for precision material processing across diverse industries, including semiconductor and microelectronics fabrication, electric vehicle and battery production, metal cutting and welding, and advanced manufacturing that emphasize greater manufacturing precision, flexibility, and sustainability.

Operating Segment Information

Prior to fiscal year 2026, we operated in two reportable segments: Cloud & Networking and Industrial Tech. During the first quarter of fiscal year 2026, we implemented a reorganization and are now managed as a single, integrated enterprise. A unified management team oversees operations across the entire company rather than through discrete operating segments. The Chief Operating Decision Maker (“CODM”) is our Chief Executive Officer, who reviews financial information presented as a single enterprise to allocate resources and evaluate financial performance.

The CODM assesses performance and allocates resources based on consolidated net (loss) income from our consolidated statements of operations. This metric is used to set budgets, evaluate performance, review actual results, and determine whether to reinvest profits, pursue acquisitions, or make other capital management decisions. Segment expenses are reflected in our consolidated statements of operations and cash flows, while segment assets are measured through the consolidated assets on the consolidated balance sheets. Accordingly, we operate in a single reporting segment. Comparative prior-period segment information has been updated to reflect this structure, with no impact on previously reported consolidated results of operations, financial position or cash flows.

Industry Conditions

Through fiscal year 2024, we experienced significant fluctuations in demand as customers delayed projected shipments or built up inventory in response to supply shortages and then brought down inventories as supply chain constraints eased. Our revenue fluctuated in response to these changes in demand and our margins were adversely impacted as we were not able to fully recover costs, such as underutilized manufacturing capacity. However, beginning in the first quarter of fiscal year 2025, network equipment manufacturers normalized inventory levels; and since then, we have seen increasing demand from AI and cloud customers as they continue to expand their data centers, driven in part by the continued advances in cloud and AI infrastructure. This demand is outpacing our current supply which has

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Foreign Exchange Risk

We conduct our business and sell our products to customers primarily in Asia, Europe, and North America. Due to the impact of changes in foreign currency exchange rates between the U.S. Dollar and foreign currencies, we recorded foreign exchange losses of $0.5 million in fiscal year 2026, foreign exchange losses of $4.2 million in fiscal year 2025 and foreign exchange gains of $0.8 million in fiscal year 2024 in the consolidated statements of operations.

Although we sell primarily in the U.S. Dollar, we have foreign currency exchange risks related to our expenses denominated in currencies other than the U.S. Dollar, principally the Chinese Yuan, Canadian Dollar, Thai Baht, Japanese Yen, Hong Kong Dollar, UK Pound, Swiss Franc, and Euro. The volatility of exchange rates depends on many factors that we cannot forecast with reliable accuracy. In the event our foreign currency denominated monetary assets and liabilities, sales or expenses increase, our operating results may be affected to a greater extent by fluctuations in the exchange rates of the currencies in which we do business as compared with the U.S. dollar.

Equity Price Risk

We are exposed to equity price risk related to the conversion options embedded in our 2032 Notes, 2029 Notes, 2028 Notes and 2026 Notes.

We issued the 2032 Notes in September 2025, 2029 Notes in June 2023, the 2028 Notes in March 2022 and the 2026 Notes in December 2019. As of June 27, 2026, the aggregate principal amounts of the 2032 Notes, 2029 Notes, 2028 Notes and 2026 Notes is $1,265.0 million, $54.9 million, $179.6 million, $54.8 million, respectively, and bear interest at a rate of 0.375%, 1.50%, 0.50% and 0.50% per year, respectively. Since the convertible notes bear interest at fixed rates, we have no financial statement risk associated with changes in market interest rates. However, the potential value of the shares to be distributed to the holders of our convertible notes changes when the market price of our stock fluctuates. The 2032 Notes, 2029 Notes, 2028 Notes and 2026 Notes will mature on March 15, 2032, December 15, 2029, June 15, 2028 and December 15, 2026, respectively, unless earlier repurchased by us or converted pursuant to their terms, at a conversion price of approximately $187.77 per share for the 2032 Notes, $69.54 per share for the 2029 Notes, $131.03 per share for the 2028 Notes and $99.29 per share for the 2026 Notes. In fiscal year 2026, we have equitized $209.7 million, $650.4 million and $264.8 million in aggregate principal amount of 2029 Notes, 2028 Notes, and 2026 Notes respectively. In fiscal year 2026, we have settled early conversions which also reduced $339.1 million, $31.0 million, and $149.3 million in aggregate principal amount of the 2029 Notes, 2028 Notes, and 2026 Notes respectively.

In connection with the issuance of the 2032 Notes, we entered into the 2032 Capped Call Options with the 2032 Capped Call Counterparties. The cap price of the 2032 Capped Call Options was initially $268.24 per share, and is subject to certain adjustments under the terms of the 2032 Capped Call Options. To the extent the market price per share of our common stock, as measured under the terms of the 2032 Capped Call Options, exceeds the cap price of the 2032 Capped Call Options, there would be dilution and/or there would not be an offset of any potential cash payments in excess of the principal amounts of converted 2032 Notes, in each case, to the extent that such market price exceeds the cap price of the 2032 Capped Call Options.

Interest Rate Fluctuation Risk

As of June 27, 2026, we had cash, cash equivalents, and short-term investments of $2,738.4 million. Cash equivalents and short-term investments are primarily comprised of money market funds, treasuries, agencies, high quality investment grade fixed income securities, certificates of deposit, and commercial paper. Our investment policy and strategy is focused on the preservation of capital and supporting our liquidity requirements. We do not enter into investments for trading or speculative purposes. As of June 27, 2026, the weighted-average life of our investment portfolio was approximately twelve months.

Our fixed-income portfolio is subject to fluctuations in interest rates, which could affect our results of operations. Based on our investment portfolio balance as of June 27, 2026, a hypothetical increase or decrease in interest rates of 1% (100 basis points) would have resulted in a decrease or an increase in the fair value of our portfolio of approximately $7.4 million, and a hypothetical increase or decrease of 0.50% (50 basis points) would have resulted in a decrease or an increase in the fair value of our portfolio of approximately $3.6 million.

On December 19, 2025, we entered into a Credit Agreement providing for a senior secured revolving credit facility in an aggregate principal amount of $400.0 million, including a $23.0 million sublimit for the issuance of letters of credit. At our option, borrowings bears interest at a variable rate tied to either a base rate or a term Secured Overnight Financing Rate, plus, in each case, a margin based on our secured net leverage ratio. Consequently, our interest expense could fluctuate due to the variable interest rates applicable to any borrowing under the Credit Agreement. As of June 27, 2026, there were no borrowings outstanding under the Credit Agreement.

Bank Liquidity Risk

As of June 27, 2026, we had approximately $635.9 million of unrestricted cash (excluding cash equivalents) in operating accounts that are held with domestic and international financial institutions. These cash balances could be lost or become inaccessible if the underlying financial institutions fail or if they are unable to meet the liquidity requirements of their depositors and if they are not supported by the national government of the country in which such financial institution is located. Notwithstanding, we have not incurred any losses to date and have had full access to our operating accounts. We believe any failures of domestic and international financial institutions could impact our ability to fund our operations in the short term. The value of our investment portfolio could also be impacted if we hold debt instruments which were issued by any institutions that fail or become illiquid. Our ability to obtain raw materials for our supply chain and collections of cash from sales may be unduly impacted if any of our vendors or customers are affected by illiquidity events.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders and the Board of Directors of Lumentum Holdings Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Lumentum Holdings Inc. and subsidiaries (the “Company”) as of June 27, 2026 and June 28, 2025, the related consolidated statements of operations, comprehensive income (loss), cash flows, and stockholders’ equity for each of the three years in the period ended June 27, 2026, and the related notes and the schedule listed in the Index at Item 15 (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of June 27, 2026 and June 28, 2025, and the results of its operations and its cash flows for each of the three years in the period ended June 27, 2026, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of June 27, 2026, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated August 17, 2026, expressed an unqualified opinion on the Company's internal control over financial reporting.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the audit committee and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing a separate opinion on the critical audit matters or on the accounts or disclosures to which it relates.

Inventories, Valuation of Inventory - Refer to Notes 1 and 7 to the financial statements

Critical Audit Matter Description

The Company assesses the value of inventory and writes down those inventories which are obsolete or in excess of forecasted demand to the lower of their cost or estimated net realizable value. The Company’s estimates of forecasted demand are based upon analysis and assumptions including, but not limited to, expected product lifecycles, product development plans and historical usage by product.

We identified the valuation of inventory as a critical audit matter because of the significant assumptions management makes with regards to estimating certain elements of the excess and obsolete write downs. This required a high degree of auditor judgment and an increased extent of effort when performing audit procedures to evaluate the reasonableness of inputs used in management’s valuation of inventory excess and obsolete write downs including estimates of expected product lifecycles, product development plans and historical usage by product.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to management’s estimates of forecasted demand used in the valuation of inventory excess and obsolete write downs included the following, among others:

• We tested the effectiveness of controls over the review and approval of the valuation of inventory for excess and obsolete write downs, including controls designed to review the assumptions regarding expected product lifecycles, product development plans and historical usage by product.

• We selected a sample of inventory products and tested the forecasted demand by comparing internal and external information (e.g. historical usage, contracts, communications with customers, expected product lifecycles, product development plans, macroeconomic conditions, and inquiries with business unit managers, executives, sales, and operations personnel) with the Company’s forecasted demand.

• We selected a sample of inventory products and evaluated management's ability to accurately estimate forecasted demand by comparing current usage by product to estimates made in prior year.

• We considered the existence of contradictory evidence based on reading of internal communications to management and the board of directors, Company press releases, and analyst reports, as well as our observations and inquiries as to changes within the business.

/s/ DELOITTE & TOUCHE LLP

San Jose, California

August 17, 2026

We have served as the Company's auditor since 2016.

LUMENTUM HOLDINGS INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(in millions, except per share data)

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None.

(a) Evaluation of Disclosure Controls and Procedures

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Management, with the participation of our chief executive officer and our chief financial officer, evaluated the effectiveness of our disclosure controls and procedures as of June 27, 2026. The term “disclosure controls and procedures,” as defined in Rules 13a-15 and 15d-15 under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to our management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well-designed and operated, can provide only reasonable assurance of achieving their objectives, and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of June 27, 2026, our chief executive officer and chief financial officer concluded that our disclosure controls and procedures were effective at a reasonable assurance level.

(b) Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act). Management conducted an assessment of the effectiveness of our internal control over financial reporting based on the criteria set forth in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework). Based on the assessment, management has concluded that its internal control over financial reporting was effective as of June 27, 2026 to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements in accordance with U.S. GAAP.

Deloitte & Touche LLP, the independent registered public accounting firm that audited the consolidated financial statements included in this Form 10-K, has issued a report, included herein, on the effectiveness of the Company’s internal control over financial reporting as of June 27, 2026.

(c) Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting as defined in Exchange Act Rules 13a-15(f) and 15d-15(f), identified in connection with the evaluation required by Exchange Act Rules 13a-15(d) or 15d-15(d) that occurred during our most recently completed fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

(d) Inherent Limitations on Effectiveness of Controls

Our management, including the CEO and CFO, recognizes that our disclosure controls and procedures or our internal control over financial reporting cannot prevent or detect all possible instances of errors and all fraud. A control system, no matter how well-designed and operated, can provide only reasonable, not absolute, assurance that the control system's objectives will be met. The design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders and the Board of Directors of Lumentum Holdings Inc.

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of Lumentum Holdings Inc. and subsidiaries (the “Company”) as of June 27, 2026, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of June 27, 2026, based on criteria established in Internal Control - Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements as of and for the year ended June 27, 2026, of the Company and our report dated August 17, 2026, expressed an unqualified opinion on those financial statements.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ DELOITTE & TOUCHE LLP

San Jose, California

August 17, 2026

Securities Trading Plans of Directors and Executive Officers

During our last fiscal quarter, the following officers, as defined in Rule 16a-1(f), adopted a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement,” each as defined in Regulation S-K Item 408.

On May 19, 2026, Wupen Yuen, our President, Global Business Units, adopted a modification of his Rule 10b5-1 trading arrangement entered into on November 5, 2025, providing for the sale from time to time of an aggregate of up to 18,422 shares of our common stock (based on PSUs vesting at target). The actual number of shares sold under the trading arrangement will depend on achievement of performance targets applicable to the PSUs subject to the trading arrangement, be subject to vesting of the PSUs and RSUs subject to the trading arrangement, and be net of shares withheld for taxes upon vesting and settlement of the PSUs and RSUs subject to the trading arrangement. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until May 19, 2027, or earlier if all transactions under the trading arrangement are completed.

On May 26, 2026, Wajid Ali, our Executive Vice President and Chief Financial Officer, adopted a modification of his Rule 10b5-1 trading arrangement entered into on November 28, 2025. The modified plan provides for the sale from time to time of an aggregate of up to 61,936 shares of our common stock (based on PSUs vesting at target). The actual number of shares sold under the trading arrangement will depend on achievement of performance targets applicable to the PSUs subject to the trading arrangement, be subject to vesting of the PSUs and RSUs subject to the trading arrangement, and be net of shares withheld for taxes upon vesting and settlement of the PSUs and RSUs subject to the trading arrangement. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until May 26, 2027, or earlier if all transactions under the trading arrangement are completed.

On May 28, 2026, Michael Hurlston, our President and Chief Executive Officer, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 1,096 shares of our common stock. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until May 28, 2027, or earlier if all transactions under the trading arrangement are completed.

Not applicable.

PART III

The SEC allows us to include information required in this Annual Report by referring to other documents or reports we have already filed or will soon be filing. This is called “incorporation by reference.” We intend to file our definitive proxy statement for our 2026 annual meeting of stockholders (the “Proxy Statement”) pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Annual Report, and certain information to be contained therein is incorporated in this Annual Report by reference.

The information required for this Item will be set forth in the Proxy Statement and is incorporated herein by reference.

The information required for this Item will be set forth in the Proxy Statement and is incorporated herein by reference.

The information required for this Item will be set forth in the Proxy Statement and is incorporated herein by reference.

The information required for this Item will be set forth in the Proxy Statement and is incorporated herein by reference.

The information required for this Item will be set forth in the Proxy Statement and is incorporated herein by reference.

PART IV

1. Financial Statements

The financial statements filed as part of this Annual Report are listed in the section titled “Financial Statements and Supplementary Data” under Part II, Item 8 of this Annual Report.

2. Financial Statement Schedules

The following additional financial statement schedules should be considered in conjunction with our consolidated financial statements. All other financial statement schedules have been omitted because the required information is not present in amounts sufficient to require submission of the schedule, not applicable, or because the required information is included in the consolidated financial statements or notes thereto.

LUMENTUM HOLDINGS INC.

FINANCIAL STATEMENT SCHEDULES

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

(1) Additions include current year additions charged to expenses and current year build due to increases in net deferred tax assets, return to provision true-ups, other adjustments to deferred taxes.

(2) Net deductions include current year releases credited to expenses and current year reductions due to decreases in net deferred tax assets, return to provision true-ups, other adjustments to deferred taxes.

3. Exhibits

The following exhibits are filed herewith or are incorporated by reference to exhibits previously filed with the Securities and Exchange Commission.

• Indicates management contract or compensatory plan or arrangement.

† The certifications furnished in Exhibits 32.1 and 32.2 that accompany this Annual Report on Form 10-K, are not deemed filed with the Securities and Exchange Commission and are not to be incorporated by reference into any filing of the Registrant under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, whether made before or after the date of this Annual Report on Form 10-K, irrespective of any general incorporation language contained in such filing.

None.

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this Annual Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized.

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Wajid Ali and Jae Kim, and each of them individually, as his or her attorney-in-fact, each with full power of substitution, for him or her in any and all capacities to sign any and all amendments to this Annual Report on Form 10-K, and to file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that said attorney-in-fact, or his or her substitute, may do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this Annual Report on Form 10-K has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.