(Mark One) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year endedDecember 31, 2025OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 IPG PHOTONICS CORPORATION (Exact name of registrant as specified in its charter) 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 Section13 or Section15(d) of the Act.Yes☐No☑ Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d) of the Securities Exchange Act of 1934 during thepreceding 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 past90 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 emerginggrowth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth company" in Rule 12b-2 ofthe 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 revisedfinancial 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 overfinancial 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 auditreport.☑ 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 reflectthe 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 ofthe 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☑ The aggregate market value of the registrant's common stock held by non-affiliates of the registrant was approximately $1.8billion, calculated based upon theclosing price as reported by the Nasdaq Global Select Market on June 30, 2025. For purposes of this disclosure, shares of common stock held by persons who own5% or more of the outstanding common stock and shares of common stock held by each officer and director have been excluded in that such persons may be deemedto be "affiliates" as that term is defined under the Rules and Regulations of the Exchange Act. This determination of affiliate status is not necessarily conclusive. As of February20, 2026, 42,191,353 shares of the registrant's common stock were outstanding. DOCUMENTS INCORPORATED BY REFERENCE None Table of Contents TABLE OF CONTENTS PART I ITEM1.BUSINESSITEM1A.RISK FACTORSITEM1B.UNRESOLVED STAFF COMMENTSITEM 1C.CYBERSECURITYITEM2.PROPERTIESITEM3.LEGAL PROCEEDINGSITEM4.MINE SAFETY DISCLOSURES PART IIITEM5.MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERSAND ISSUER PURCHASES OF EQUITY SECURITIESITEM6.RESERVEDITEM7.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTSOF OPERATIONSITEM7A.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISKITEM8.FINANCIAL STATEMENTS AND SUPPLEMENTARY DATAITEM9.CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING ANDFINANCIAL DISCLOSUREITEM9A.CONTROLS AND PROCEDURESITEM9B.OTHER INFORMATIONITEM9C.DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS PART III ITEM10.DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCEITEM11.EXECUTIVE COMPENSATIONITEM12.SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT ANDRELATED STOCKHOLDER MATTERSITEM13.CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTORINDEPENDENCEITEM14.PRINCIPAL ACCOUNTING FEES AND SERVICES PART IVITEM15.EXHIBITS AND FINANCIAL STATEMENT SCHEDULESITEM16.FORM 10-K SUMMARY SIGNATURES INDEX TO FINANCIAL STATEMENTS This Annual Report on Form 10-K contains certain forward-looking statements within the meaning of Section27A of the Securities Actof 1933, as amended, and Section21E of the Securities Exchange Act of 1934, as amended, and we