[8-K] SIERRA BANCORP Reports Material Event

Rhea-AI Filing Summary

Sierra Bancorp furnished an 8-K under Item 2.02 announcing it issued a press release with unaudited consolidated financial results for the three- and nine-month periods ended September 30, 2025.

The press release is attached as Exhibit 99.1 and, as furnished information, is not deemed “filed” for purposes of Section 18 of the Exchange Act nor incorporated by reference into other filings. Sierra Bancorp’s common stock trades on the NASDAQ Global Select Market under the symbol BSRR.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) October 27, 2025

SIERRA BANCORP

(Exact name of registrant as specified in its charter)

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California	000-33063	33-0937517
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

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86 North Main Street, Porterville, CA 93257
(Address of principal executive offices)	(Zip code)

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(559) 782-4900

(Registrant’s telephone number including area code)

Not applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

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Title of each class	​	Trading Symbol(s)	​	Name of each exchange on which registered
Common Stock, no par value	​	BSRR	​	NASDAQ Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging 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 revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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ITEM 2.02RESULTS OF OPERATIONS AND FINANCIAL CONDITION

On October 27, 2025, Sierra Bancorp issued a press release announcing its unaudited consolidated financial results for the three- and nine-month periods ended September 30, 2025.  A copy of the press release is attached as Exhibit 99.1 to this Current Report.

The information in this report (including Exhibit 99.1) is being furnished pursuant to Item 2.02 and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, (the “Exchange Act”) or otherwise subject to the liabilities of that section, nor shall it be deemed to be incorporated by reference in any filing under the Securities Act of 1933 or the Exchange Act.

ITEM 9.01FINANCIAL STATEMENTS AND EXHIBITS

(d)Exhibits. The information required to be furnished pursuant to this item is set forth in the Exhibit Index which appears below, immediately before the signatures.

EXHIBIT INDEX

Exhibit No.		Description
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99.1	​	Press release issued by Sierra Bancorp dated October 27, 2025
104	​	Cover Page Interactive Data File (formatted in Inline XBRL and contained in Exhibit 101)

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SIGNATURES

Pursuant to the requirements of the Securities and Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

​ ​ ​ ​ ​	​ Executive Vice President & Chief Financial Officer
​ ​ ​ ​ Dated: October 27, 2025	SIERRA BANCORP By: /s/ Christopher G. Treece​ ​ Christopher G. Treece Executive Vice President & Chief Financial Officer

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FAQ

What did Sierra Bancorp (BSRR) announce in this 8-K?

It furnished Item 2.02 to announce a press release with unaudited results for the three- and nine-month periods ended September 30, 2025.

Which exhibit contains Sierra Bancorp’s Q3 2025 results?

Exhibit 99.1 contains the press release with the unaudited results.

Are the results considered filed or furnished?

They are furnished under Item 2.02 and are not deemed “filed” under Section 18 of the Exchange Act.

What is Sierra Bancorp’s trading symbol and listing?

The common stock trades as BSRR on the NASDAQ Global Select Market.

What periods do the disclosed results cover?

The press release covers the three- and nine-month periods ended September 30, 2025.

When was the press release dated?

The press release is dated October 27, 2025.