(Mark One) ☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF1934For the fiscal year endedDecember 31, 2023OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACTOF 1934 For the transition period from ____________ to __________ Commission file number001-38487 Origin Bancorp, Inc.(Exact name of registrant as specified in its charter) 72-1192928(I.R.S. EmployerIdentification Number) Louisiana(State or other jurisdiction ofincorporation or organization) 71270 (Zip code) (318)255-2222(Registrant’s telephone number, including areacode) Securities Registered pursuant to Section 12(b) of the Act: Title of Each ClassTrading Symbol(s)Name of Exchange on which RegisteredCommon Stock, par value $5.00 pershareOBKNew York Stock Exchange Securities Registered pursuant to Section 12(g) of the Act:None Indicate by check mark whether the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.Yes☒No☐ Indicate by check mark whether 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 SecuritiesExchange 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☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submittedpursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that theregistrant 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, smaller reportingcompany, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reportingcompany" and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one) Large accelerated filer☒Accelerated filer☐Non-accelerated filer☐Smaller reportingcompany☐Emerging growthcompany If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying 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 effectivenessof its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registeredpublic accounting firm that prepared or issued its audit report. Yes☒No☐ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of theregistrant 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-basedcompensation 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☒ The aggregate market value of the voting and non-voting common equity held by non-affiliates of the Registrant was $851.4millionas of June 30, 2023, the last business day of the Registrant’s most recently completed second fiscal quarter. Solely for the purpose ofthis computation, it has been assumed that executive officers and directors of the Registrant are "affiliates". Indicate the number of shares outstanding of each of the issuer’s classes of common stock as of the latest practicable date:30,988,548shares of Common Stock, par value $5.00 per share, were issued and outstanding as of February 15, 2024. DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s Definitive Proxy Statement for the 2024 Annual Meeting of Stockholders of Origin Bancorp, Inc.to be held on April 24, 2024, are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent statedherein. Such Definitive Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end ofthe registrant’s fiscal year ended December 31, 2023. EXPLANATORY NOTE This Amendment No. 1 to the Annual Report on Form 10-K of Origin Bancorp, Inc. (the “Company”) for the fiscal yearended December 31, 2023, amends the Company’s Form 10-K for the fiscal year ended December 31, 2023, originally filed with theSecurities and Exchange Commission (“SEC”) on February 28, 2024 (the “Original Filing”). The Company is filing this Amendment No. 1 to address management’s re-eva