HFWA

hfwa-202601220001046025False00010460252026-01-222026-01-22

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): January 22, 2026

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWAThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On January 22, 2026, Heritage Financial Corporation (“Heritage”) issued a press release announcing its fourth quarter and annual 2025 results. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor presentation that it reviewed in conjunction with its earnings release conference call on January 22, 2026. A copy of the presentation materials is attached hereto as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Exchange Act, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 9.01     Financial Statements and Exhibits (d) Exhibits

Exhibit 99.1 Press Release announcing fourth quarter and annual 2025 results dated January 22, 2026

Exhibit 99.2Fourth Quarter 2025 Investor Presentation

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: January 22, 2026/S/ BRYAN MCDONALD Bryan McDonald President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202510230001046025False00010460252025-10-232025-10-23

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): October 23, 2025

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☒ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWAThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On October 23, 2025, Heritage Financial Corporation (“Heritage”) issued a press release announcing its third quarter 2025 results. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor presentation that it reviewed in conjunction with its earnings release conference call on October 23, 2025. A copy of the presentation materials is attached hereto as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Exchange Act, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 8.01    Other Events On October 23, 2025, Heritage issued a press release announcing a regular quarterly cash dividend of $0.24 per common share. The dividend will be paid on November 19, 2025 to shareholders of record at the close of business on November 5, 2025. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits

Exhibit 99.1 Press Release announcing third quarter 2025 results and declares regular cash dividend of $0.24 per share dated October 23, 2025

Exhibit 99.2Third Quarter 2025 Investor Presentation

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: October 23, 2025/S/ BRYAN MCDONALD Bryan McDonald President and Chief Executive Officer (Duly Authorized Officer)

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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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): July 24, 2025

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWAThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On July 24, 2025, Heritage Financial Corporation (“Heritage”) issued a press release announcing its second quarter 2025 results. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor presentation that it reviewed in conjunction with its earnings release conference call on July 24, 2025. A copy of the presentation materials is attached hereto as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Exchange Act, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 8.01    Other Events On July 24, 2025, Heritage issued a press release announcing a regular quarterly cash dividend of $0.24 per common share. The dividend will be paid on August 20, 2025 to shareholders of record at the close of business on August 6, 2025. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits

Exhibit 99.1 Press Release announcing second quarter 2025 results and declares regular cash dividend of $0.24 per share dated July 24, 2025

Exhibit 99.2Second Quarter 2025 Investor Presentation

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: July 24, 2025/S/ BRYAN MCDONALD Bryan McDonald Chief Executive Officer (Duly Authorized Officer)

hfwa-202504240001046025False00010460252025-04-242025-04-24

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): April 24, 2025

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWAThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On April 24, 2025, Heritage Financial Corporation (“Heritage”) issued a press release announcing its first quarter 2025 results. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor presentation that it reviewed in conjunction with its earnings release conference call on April 24, 2025. A copy of the presentation materials is attached hereto as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Exchange Act, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 8.01    Other Events On April 24, 2025, Heritage issued a press release announcing a regular quarterly cash dividend of $0.24 per common share. The dividend will be paid on May 21, 2025 to shareholders of record at the close of business on May 7, 2025. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits

Exhibit 99.1 Press Release announcing first quarter 2025 results and declares regular cash dividend of $0.24 per share dated April 24, 2025

Exhibit 99.2First Quarter 2025 Investor Presentation

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: April 24, 2025/S/ JEFFREY J. DEUEL

Jeffrey J. Deuel Chief Executive Officer (Duly Authorized Officer)

hfwa-202501230001046025False00010460252025-01-232025-01-23

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): January 23, 2025

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWAThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On January 23, 2025, Heritage Financial Corporation (“Heritage”) issued a press release announcing its fourth quarter and annual 2024 results. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor presentation that it reviewed in conjunction with its earnings release conference call on January 23, 2025. A copy of the presentation materials is attached hereto as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Exchange Act, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 8.01    Other Events On January 23, 2025, Heritage issued a press release announcing a regular quarterly cash dividend of $0.24 per common share. The dividend will be paid on February 20, 2025 to shareholders of record at the close of business on February 6, 2025. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits

Exhibit 99.1 Press Release announcing fourth quarter and annual 2024 results and declares cash dividend of $0.24 per share dated January 23, 2025

Exhibit 99.2Fourth Quarter 2024 Investor Presentation

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: January 23, 2025/S/ JEFFREY J. DEUEL

Jeffrey J. Deuel Chief Executive Officer (Duly Authorized Officer)

hfwa-202410240001046025False00010460252024-10-242024-10-24

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): October 24, 2024

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWAThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On October 24, 2024, Heritage Financial Corporation (“Heritage”) issued a press release announcing its third quarter 2024 financial results. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor presentation that it reviewed in conjunction with its earnings release conference call on October 24, 2024. A copy of the presentation materials is attached hereto as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Exchange Act, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 8.01    Other Events On October 24, 2024, Heritage issued a press release announcing a regular quarterly cash dividend of $0.23 per common share. The dividend will be paid on November 20, 2024 to shareholders of record at the close of business on November 6, 2024. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits

Exhibit 99.1 Press Release announcing third quarter 2024 financial results and cash dividend dated October 24, 2024

Exhibit 99.2Third Quarter 2024 Investor Presentation

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: October 24, 2024/S/ JEFFREY J. DEUEL

Jeffrey J. Deuel Chief Executive Officer (Duly Authorized Officer)

hfwa-202407250001046025False00010460252024-07-252024-07-25

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): July 25, 2024

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWAThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On July 25, 2024, Heritage Financial Corporation (“Heritage”) issued a press release announcing its second quarter 2024 financial results. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor presentation that it reviewed in conjunction with its earnings release conference call on July 25, 2024. A copy of the presentation materials is attached hereto as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated herein by reference. The information furnished pursuant to this Item and the related exhibit is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Heritage for purposes of Section 18 of the Exchange Act, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such filing.

Item 8.01    Other Events On July 25, 2024, Heritage issued a press release announcing a regular quarterly cash dividend of $0.23 per common share. The dividend will be paid on August 21, 2024 to shareholders of record at the close of business on August 7, 2024. A copy of the release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits

Exhibit 99.1 Press Release announcing second quarter 2024 financial results and cash dividend dated July 25, 2024

Exhibit 99.2Second Quarter 2024 Investor Presentation

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: July 25, 2024/S/ JEFFREY J. DEUEL

Jeffrey J. Deuel Chief Executive Officer (Duly Authorized Officer)

hfwa-202404250001046025False00010460252024-04-252024-04-25

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): April 25, 2024

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On April 25, 2024, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the quarter ended March 31, 2024. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on April 25, 2024. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On April 25, 2024, Heritage issued a press release announcing a regular quarterly cash dividend of $0.23 per common share. The dividend will be paid on May 22, 2024 to shareholders of record at the close of business on May 8, 2024. In addition, Heritage announced that the Company's Board of Directors authorized the repurchase of up to 5% of the Company's outstanding common shares or approximately 1.7 million shares. The number, timing and price of shares repurchased will depend on business and market conditions, and other factors, including opportunities to deploy the Company's capital. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated April 25, 2024 announcing financial results for the first quarter ended March 31, 2024 and cash dividend

Exhibit 99.2Heritage Financial Corporation Presentation Materials

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: April 25, 2024/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202401250001046025False00010460252024-01-252024-01-25

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): January 25, 2024

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On January 25, 2024, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the quarter ended December 31, 2023. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on January 25, 2024. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On January 25, 2024, Heritage issued a press release announcing a regular quarterly cash dividend of $0.23 per common share. The dividend will be paid on February 22, 2024 to shareholders of record at the close of business on February 8, 2024. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated January 25, 2024 announcing financial results for the fourth quarter and year ended December 31, 2023 and cash dividend

Exhibit 99.2Heritage Financial Corporation Presentation Materials

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: January 25, 2024/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202310190001046025False00010460252023-10-192023-10-19

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): October 19, 2023

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On October 19, 2023, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the quarter ended September 30, 2023. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on October 19, 2023. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On October 19, 2023, Heritage issued a press release announcing a regular quarterly cash dividend of $0.22 per common share. The dividend will be paid on November 15, 2023 to shareholders of record at the close of business on November 1, 2023. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated October 19, 2023 announcing financial results for the quarter ended September 30, 2023 and cash dividend

Exhibit 99.2Heritage Financial Corporation Presentation Materials

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: October 19, 2023/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202307200001046025False00010460252023-07-202023-07-20

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): July 20, 2023

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On July 20, 2023, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the second quarter and year ended June 30, 2023. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on July 20, 2023. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On July 20, 2023, Heritage issued a press release announcing a regular quarterly cash dividend of $0.22 per common share. The dividend will be paid on August 16, 2023 to shareholders of record at the close of business on August 2, 2023. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated July 20, 2023 announcing financial results for the second quarter and year ended June 30, 2023 and cash dividend

Exhibit 99.2Heritage Financial Corporation Presentation Materials

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: July 20, 2023/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202304200001046025False00010460252023-04-202023-04-20

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): April 20, 2023

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On April 20, 2023, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the first quarter ended March 31, 2023. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on April 20, 2023. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On April 20, 2023, Heritage issued a press release announcing a regular quarterly cash dividend of $0.22 per common share. The dividend will be paid on May 18, 2023 to shareholders of record at the close of business on May 4, 2023. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated April 20, 2023 announcing financial results for the first quarter ended and cash dividend

Exhibit 99.2Heritage Financial Corporation Presentation Materials

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: April 20, 2023/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202301260001046025False00010460252023-01-262023-01-26

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): January 26, 2023

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On January 26, 2023, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the fourth quarter and year ended December 31, 2022. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on January 26, 2023. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On January 26, 2023, Heritage issued a press release announcing a regular quarterly cash dividend of $0.22 per common share. The dividend will be paid on February 22, 2023 to shareholders of record at the close of business on February 8, 2023. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated January 26, 2023 announcing financial results for the fourth quarter and year ended December 31, 2022 and cash dividend

Exhibit 99.2Heritage Financial Corporation Presentation Materials

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: January 26, 2023/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202210200001046025false00010460252022-10-202022-10-20

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): October 20, 2022

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On October 20, 2022, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the third quarter and year ended September 30, 2022. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on October 20, 2022. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On October 20, 2022, Heritage issued a press release announcing a regular quarterly cash dividend of $0.21 per common share. The dividend will be paid on November 16, 2022 to shareholders of record at the close of business on November 2, 2022. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated October 20, 2022 announcing financial results for the third quarter and year ended September 30, 2022 and cash dividend

Exhibit 99.2Heritage Financial Corporation Presentation Materials

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: October 20, 2022/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202207210001046025false00010460252022-07-212022-07-21

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): July 21, 2022

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On July 21, 2022, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the second quarter and year ended June 30, 2022. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on July 21, 2022. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On July 21, 2022, Heritage issued a press release announcing a regular quarterly cash dividend of $0.21 per common share. The dividend will be paid on August 17, 2022 to shareholders of record at the close of business on August 3, 2022. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated July 21, 2022 announcing financial results for the second quarter and year ended June 30, 2022 and cash dividend

Exhibit 99.2Heritage Financial Corporation Presentation Materials

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: July 21, 2022/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202204210001046025false00010460252022-04-212022-04-21

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): April 21, 2022

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On April 21, 2022, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the first quarter ended March 31, 2022. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on April 21, 2022. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On April 21, 2022, Heritage issued a press release announcing a regular quarterly cash dividend of $0.21 per common share. The dividend will be paid on May 18, 2022 to shareholders of record at the close of business on May 4, 2022. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated April 21, 2022 announcing financial results for the first quarter ended March 31, 2022 and cash dividend

Exhibit 99.2Heritage Financial Corporation Presentation Materials

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: April 21, 2022/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202201270001046025false00010460252022-01-272022-01-27

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): January 27, 2022

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On January 27, 2022, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the fourth quarter and year ended December 31, 2021. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on January 27, 2022. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On January 27, 2022, Heritage issued a press release announcing a regular quarterly cash dividend of $0.21 per common share. The dividend will be paid on February 23, 2022 to shareholders of record at the close of business on February 9, 2022. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated January 27, 2022 announcing financial results for the fourth quarter and year ended December 31, 2021 and cash dividend

Exhibit 99.2Heritage Financial Corporation Presentation Materials

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: January 27, 2022/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202110210001046025false00010460252021-07-222021-07-2200010460252021-10-212021-10-2100010460252021-07-012021-09-30

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): October 21, 2021

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On October 21, 2021, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the third quarter and year ended September 30, 2021. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on October 21, 2021. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On October 21, 2021, Heritage issued a press release announcing a regular quarterly cash dividend of $0.21 per common share. The dividend will be paid on November 17, 2021 to shareholders of record at the close of business on November 3, 2021. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated October 21, 2021 announcing financial results for the third quarter and year ended September 30, 2021 and cash dividend.

Exhibit 99.2Heritage Financial Corporation Presentation Materials

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: October 21, 2021/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202107220001046025false00010460252021-07-222021-07-2200010460252021-04-012021-06-30

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): July 22, 2021

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On July 22, 2021, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the second quarter and year ended June 30, 2021. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on July 22, 2021. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On July 22, 2021, Heritage issued a press release announcing a regular quarterly cash dividend of $0.20 per common share. The dividend will be paid on August 18, 2021 to shareholders of record at the close of business on August 4, 2021. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated July 22, 2021 announcing financial results for the second quarter and year ended June 30, 2021 and cash dividend.

Exhibit 99.2Heritage Financial Corporation Presentation Materials

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: July 22, 2021/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)

hfwa-202104220001046025false00010460252021-04-222021-04-2200010460252021-01-012021-03-31

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 and Exchange Act of 1934 Date of Report (Dated of earliest event reported): April 22, 2021

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number 000-29480

Washington 91-1857900 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

201 Fifth Avenue SW,OlympiaWA 98501 (Address of principal executive offices) (Zip Code)

(360) 943-1500 (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:

☐ 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:

Title of each classTrading symbolName of each exchange on which registered Common stock, no par valueHFWANASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§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. ☐

Item 2.02    Results of Operations and Financial Condition On April 22, 2021, Heritage Financial Corporation (“Heritage”) issued a press release announcing its financial results for the first quarter ended March 31, 2021. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 7.01    Regulation FD Disclosure Heritage is filing an investor slide presentation that it reviewed in conjunction with its earnings release conference call on April 22, 2021. A copy of the presentation materials is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 8.01    Other Events On April 22, 2021, Heritage issued a press release announcing a regular quarterly cash dividend of $0.20 per common share. The dividend will be paid on May 19, 2021 to shareholders of record at the close of business on May 5, 2021. A copy of the release is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01     Financial Statements and Exhibits (d) Exhibits The following exhibit is being filed herewith and this list shall constitute the exhibit index:

Exhibit 99.1 Press Release dated April 22, 2021 announcing financial results for the quarter ended March 31, 2021 and cash dividend.

Exhibit 99.2Heritage Financial Corporation Presentation Materials

SIGNATURES

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

HERITAGE FINANCIAL CORPORATION

Date: April 22, 2021/S/    JEFFREY J. DEUEL Jeffrey J. Deuel President and Chief Executive Officer (Duly Authorized Officer)