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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

For the year ended December 31, 2021

or

For the transition period from to

Commission file number: 001-34511

FORTINET, INC.

(Exact name of registrant as specified in its charter)

899 Kifer Road

Sunnyvale, California 94086

(Address of principal executive offices, including zip code)

(408) 235-7700

(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 ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ☐ 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 (“Exchange Act”) 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 ☐

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 ☐

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 the definitions 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. ☐

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. ☒

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

The aggregate market value of voting stock held by non-affiliates of the registrant, as of June 30, 2021, the last business day of the registrant’s most recently completed second quarter, was $25,503,578,291 (based on the closing price for shares of the registrant’s common stock as reported by The Nasdaq Global Select Market on that date). Shares of common stock held by each executive officer, director, and holder of 5% or more of the registrant’s outstanding common stock have been excluded in that such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

As of February 18, 2022, there were 160,815,446 shares of the registrant’s common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive Proxy Statement relating to its 2022 Annual Meeting of Stockholders (“Proxy Statement”) are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Such Proxy Statement will be filed with the United States Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.

FORTINET, INC.

ANNUAL REPORT ON FORM 10-K

For the Year Ended December 31, 2021

Table of Contents

Summary of Risk Factors

Our business is subject to numerous risks and uncertainties, including those described in Part I, Item 1A, “Risk Factors” in this Annual Report on Form 10-K. You should carefully consider these risks and uncertainties when investing in our common stock. Some of the principle risks and uncertainties include the following:

• Our operating results are likely to vary significantly and be unpredictable.

• The COVID-19 pandemic, including its ongoing variants, could adversely affect our business in a material way, based on, for example, component shortages or negative impact on demand.

• Adverse economic conditions or reduced information technology spending may adversely impact our business.

• Our billings, revenue, and free cash flow growth may slow or may not continue, and our operating margins may decline.

• We are dependent on the continued services and performance of our senior management, as well as our ability to hire, retain and motivate qualified personnel, particularly for our sales organization.

• We rely on third-party channel partners for substantially all of our revenue and a small number of distributors represents a large percentage of our revenue and accounts receivable.

• Reliance on a concentration of shipments at the end of the quarter could cause our billings and revenue to fall below expected levels.

• We rely significantly on revenue from FortiGuard security subscription and FortiCare technical support services, and revenue from these services may decline or fluctuate.

• We have incurred indebtedness and may incur other debt in the future, which may adversely affect our financial condition and future financial results.

• We generate a majority of revenue and cash flow from sales outside of the United States.

• We may not be successful in executing our strategy to increase our sales to large- and medium-sized end-customers.

• A portion of our revenue is generated by sales to government organizations, which are subject to a number of challenges and risks.

• We face intense competition in our market and we may not maintain or improve our competitive position.

• Insufficient inventory or components, including finished goods, chips and other components, and including component or inventory shortages related to the COVID-19 pandemic, manufacturer’s capacity, shipping challenges, or other factors affecting the global supply chain, may result in lost sales opportunities or delayed billings and revenue and increased costs, and may harm our gross margins and our product price increases designed to help mitigate lower gross margins may not be acceptable to customers.

• We depend on third-party manufacturers to provide components for our products and build our products and are susceptible to manufacturing delays and cost increases.

• We are susceptible to supply chain constraints, supply shortages and disruptions, long lead times for components and finished goods and supply changes because some of the key components in our products come from limited sources of supply.

• We are susceptible to defects or vulnerabilities in our products or services, as well as reputational harm from the failure or misuse of our products or services.

• Our proprietary rights may be difficult to enforce and we may be subject to claims by others that we infringe their proprietary technology.

• The trading price of our common stock may be volatile, which volatility may be exacerbated by share repurchases under our Share Repurchase Program (the “Repurchase Program”).

• Anti-takeover provisions contained in our certificate of incorporation and bylaws, as well as provisions of Delaware law, could impair a takeover attempt.

• Global economic uncertainty and weakening product demand caused by political instability, changes in trade agreements and conflicts, such as the conflict between Russia and Ukraine, could adversely affect our business and financial performance.

Part I