Cover and table of contents

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

For the fiscal year ended December 31, 2025

Commission file number 1-10235

IDEX CORPORATION

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (847) 498-7070

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 þ 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 þ

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 þ 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 þ 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.

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. ☐

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). ☐

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

The aggregate market value, as of the last business day of the registrant’s most recently completed second fiscal quarter, of the common stock (based on the June 30, 2025 closing price of $175.57) held by non-affiliates of IDEX Corporation was $13,228,549,364.

The number of shares outstanding of IDEX Corporation’s common stock, par value $0.01 per share, as of February 13, 2026 was 74,347,824.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the proxy statement with respect to the IDEX Corporation 2026 annual meeting of stockholders (the “2026 Proxy Statement”) are incorporated by reference into Part III of this Form 10-K.

Cautionary Statement Under the Private Securities Litigation Reform Act

This annual report on Form 10-K, including the “Overview,” “Results of Operations,” “Liquidity and Capital Resources” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” contains “forward-looking” statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended. These statements may relate to, among other things, the Company’s business strategy, outlook and full year 2026 focus and the assumptions underlying these expectations, capital return strategy, plant and equipment capacity for future growth, planned production, anticipated future acquisition behavior, resource and capital deployment and focus on organic and inorganic growth, the Company’s ability to adapt to macroeconomic challenges and anticipated adaptability of resource deployment, anticipated impacts of tariffs and global trade policies and changes in law, including the One, Big, Beautiful Bill Act, the Company’s future market positioning, anticipated trends in end markets, including expectations regarding market sector contraction, recovery, stabilization or growth and underlying drivers of such expectations, expectations regarding future order volumes and order patterns, demand within end markets, availability and sufficiency of cash and financing alternatives, the impacts of any pending or threatened legal, regulatory and other proceedings involving the Company and its subsidiaries, anticipated benefits and restructuring charges, including severance charges, related to the Company’s organizational changes, the anticipated tax treatment of the Company’s recent acquisitions, the expected contingent consideration payable related to the Company’s recent acquisitions, the anticipated benefits and performance of the Company’s recent or future acquisitions, anticipated growth initiatives and expansions and the anticipated benefits of the Company’s productivity and cost containment efforts, and are indicated by words or phrases such as “anticipates,” “estimates,” “plans,” “guidance,” “expects,” “projects,” “forecasts,” “should,” “could,” “will,” “likely to be,” “management believes,” “the Company believes,” “the Company intends” and similar words or phrases. These statements are subject to inherent uncertainties and risks that could cause actual results to differ materially from those anticipated at the date of this report.

The risks and uncertainties include, but are not limited to, the following: levels of industrial activity and economic conditions in the U.S. and other countries around the world, including uncertainties in the financial markets; pricing pressures, including inflation and rising interest rates, and other competitive factors and levels of capital spending in certain industries; the impact of severe weather events, natural disasters and public health threats; economic and political consequences resulting from terrorist attacks, wars and global conflicts; the Company’s ability to make acquisitions and to integrate and operate acquired businesses on a profitable basis; cybersecurity incidents; the continued growth of artificial intelligence (“AI”) and any related changes to demand in AI-driven markets served by the Company’s customers; the relationship of the U.S. Dollar to other currencies and its impact on pricing and cost competitiveness; political and economic conditions in countries in which the Company operates; developments with respect to trade policy and existing, new or increased tariffs or other similar measures; changes to applicable laws and regulations, including tax laws; interest rates; capacity utilization and the effect this has on costs; labor markets; supply chain conditions; market conditions and material costs; risks related to environmental, social and corporate governance issues, including those related to climate change and sustainability; and developments with respect to contingencies, such as litigation and environmental matters, and the other risk factors discussed in Item 1A, “Risk Factors” of this annual report on Form 10-K. The forward-looking statements included here are only made as of the date of this report, and management undertakes no obligation to publicly update them to reflect subsequent events or circumstances, except as may be required by law. Investors are cautioned not to rely unduly on forward-looking statements when evaluating the information presented here.

The Company also routinely posts important information for investors on its website at www.idexcorp.com under “Investors.” The Company may use this website as a means of disclosing material, non-public information and for complying with its disclosure obligations under Regulation FD adopted by the United States Securities and Exchange Commission (the “SEC”). Accordingly, investors should monitor the Investor Relations portion of the Company’s website noted above, in addition to following the Company’s press releases, SEC filings, and public conference calls and webcasts. Our website and the information contained therein or connected thereto shall not be deemed to be incorporated into this annual report on Form 10-K.

Table of Contents

PART I