☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGEACT OF 1934For the fiscal year ended: December 31, 2025 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIESEXCHANGE ACT OF 1934For the transition period from _________________ to ______________________ The LGL Group, Inc.(Exact name of Registrant as Specified in Its Charter) (407) 298-2000Registrant's telephone number, including area code 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 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 RegulationS-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 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:Large accelerated filerAccelerated filer ☐☒Smaller reporting companyEmerging growth company 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 filingreflect 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 anyof 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☒ The aggregate market value of the registrant's voting and non-voting common equity held by non-affiliates of the registrant, based upon the$7.62 per share closingprice of the registrant's common stock on June 30, 2025, the last business day of the registrant's most recently completed second fiscal quarter, was$21,901,648.Solely for the purpose of this calculation, shares held by directors and executive officers of the registrant have been excluded.Such exclusion shouldnot be deemed a determination or an admission by the registrant that such individuals are, in fact, affiliates of the registrant. The number of outstanding shares of the registrant's common stock was6,528,033as of March 16, 2026. DOCUMENTS INCORPORATED BY REFERENCE Document of the RegistrantPortions of the registrant's definitive proxy statement for the2026 Annual Meeting of Stockholders The LGL Group, Inc. Form 10-K for the year endedDecember 31, 2025Table of Contents PART I Item 1.BusinessItem 1A.Risk FactorsItem 1B.Unresolved Staff CommentsItem 1C.CybersecurityItem 2.PropertiesItem 3.Legal ProceedingsItem 4.Mine Safety Disclosures PART II Item 5.Market for the Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of EquitySecuritiesItem 6.ReservedItem 7.Management's Discussion and Analysis of Financial Condition and Results of OperationsItem 7A.Quantitative and Qualitative Disclosures About Market RiskItem 8.Financial Statements and Supplementary DataItem 9.Changes in and Disagreements with Accountants on Accounting and Financial DisclosureItem 9A.Controls and ProceduresItem 9B.Other InformationItem 9C.Disclosure Regarding Foreign Jurisdictions that Prevent Inspections PART III Item 10.Directors, Executive Officers and Corporate GovernanceItem 11.Executive CompensationItem 12.Security Ownership of Certain Beneficial Owners and Management and Related Stockholder MattersItem 13.Certain Relationships and Related Transactions, and Director IndependenceItem