FORM10-Q QUARTERLY REPORT PURSUANT TO SECTION13 OR 15 (d)OF THESECURITIES EXCHANGE ACT OF 1934FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2026Commission file number: 000-33063 SIERRA BANCORP (Exact name of Registrant as specified in its charter) California33-0937517(State of Incorporation)(IRS Employer Identification No)86 North Main Street, Porterville, California 93257(Address of principal executive offices)(Zip Code)(559) 782-4900(Registrant’s telephone number, including area code)Not Applicable(Former name, former address and former fiscalyear, if changed since last report)Securities registered pursuant to Section12(b)of the Act: Indicate by check mark whether the Registrant (1)has filed all reports required to be filed by Section13 or15 (d)of the Securities Exchange Act of 1934 during the preceding 12months (or for such shorter periodthat the Registrant was required to file such reports) and (2)has been subject to such filing requirementsfor the past 90days.Yes☒No☐ Indicate by check mark whether the Registrant has submitted electronically every Interactive Data Filerequired to be submitted pursuant to Rule405 of Regulation S-T (§232.405 of this chapter) during thepreceding 12months (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 growthcompany” in Rule12b-2 of the Exchange Act. Large Accelerated Filer☐Non-accelerated Filer:☐Emerging GrowthCompany:☐ If an emerging growth company, indicate by check mark if the Registrant has elected not to use theextended transition period for complying with any new or revised financial accounting standards providedpursuant to Section7(a)(2)(B)of the Securities Act.☐ Indicate by check mark whether the Registrant is a shell company (as defined in Rule12b-2 of theExchange Act).Yes☐No☒ Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latestpracticable date. As of July 27, 2026, the registrant had 12,963,397 shares of common stock outstanding, including 173,492shares of unvested restricted stock. FORM10-Q Table of Contents Item1. Financial Statements (Unaudited)1Consolidated Balance Sheets1Consolidated Statements of Income2Consolidated Statements of Comprehensive Income3Consolidated Statements of Changes In Shareholders’ Equity4Consolidated Statements of Cash Flows6Notesto Consolidated Financial Statements (Unaudited)7 Item4. Controls and Procedures PartII- Other InformationItem1. - Legal ProceedingsItem1A. - Risk FactorsItem2. - Unregistered Sales of Equity Securities and Use of ProceedsItem3. - Defaults upon Senior SecuritiesItem4. - Mine Safety DisclosuresItem5. - Other InformationItem6. - Exhibits 6161616262626263 Signatures 65 SIERRA BANCORPCONSOLIDATED BALANCE SHEETS(dollars in thousands) Noninterest-bearing$ 1,026,320$995,623Interest-bearing1,904,6711,880,813Total deposits2,930,9912,876,436Repurchase agreements122,364130,853Other borrowings155,000302,700Long-term debt49,52849,483Subordinated debentures36,10636,017Allowance for credit losses on unfunded loan commitments570710Other liabilities59,15568,217Total liabilities3,353,7143,464,416 SIERRA BANCORPCONSOLIDATED STATEMENTS OF INCOMEFOR THE THREE AND SIX MONTHS ENDED JUNE 30, 2026 and 2025(dollars in thousands, except per share data, unaudited) The accompanying notes are an integral part of these consolidated financial statements. SIERRA BANCORPCONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOMEFOR THE THREE AND SIX MONTHS ENDED JUNE 30, 2026 and 2025(dollars in thousands, unaudited) Comprehensive income (1)Amounts are included in net gains on investment securities available-for-sale on the Consolidated Statements of Income innoninterest income.There were no income tax expenses associated with the reclassification adjustment for the three monthsended June 30, 2026, and 2025. Income tax expenses associated with the reclassification adjustment for the six months endedJune 30, 2026, and 2025 were zero and $37 thousand, respectively.(2)Included in the unrealized holding gain arising during the period is the accretion of the net unrealized loss on debt securities The accompanying notes are an integral part of these consolidated financial statements. SIERRA BANCORPCONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITYFOR THE THREE MONTHS ENDED JUNE 30, 2026 and 2025(dollars in thousands, except per share data, unaudited) SIERRA BANCORPCONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITYFOR THE SIX MONTHS ENDED JUNE 30, 2026 and 2025(dollars in thousands, except per share data, unaudited SIERRA BANCORPCONSOLIDATED STATEMENTS OF CASH FLOWSFOR THE SIX MONTHS ENDED JUNE 30, 2026 AND 2025(dollars in thousands, u