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Aclaris Therapeutics, Inc._February 26, 2026 0001557746false00015577462026-02-262026-02-26 ​

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 Exchange Act of 1934 ​ Date of Report (Date of earliest event reported): February 26, 2026 ​

​ Aclaris Therapeutics, Inc. (Exact name of registrant as specified in its charter) ​ ​

​

​

​

​

Delaware ​ 001-37581 ​ 46-0571712

(State or other jurisdiction of incorporation) ​ (Commission File Number) ​ (IRS Employer Identification No.)

​ 701 Lee Road, Suite 103 Wayne, PA 19087 (Address of principal executive offices, including zip code) ​ (484) 324-7933 (Registrant’s telephone number, including area code) ​ 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 Class:

Trading Symbol(s)

Name of Each Exchange on which Registered

Common Stock, $0.00001 par value

ACRS

The 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 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. ☐ ​ ​

Item 2.02 Results of Operations and Financial Condition. ​ On February 26, 2026, Aclaris Therapeutics, Inc. (the “Registrant”) issued a press release announcing its financial results for the quarter and full year ended December 31, 2025. A copy of this press release is furnished herewith as Exhibit 99.1 to this Current Report. ​ In accordance with General Instruction B.2. of Form 8-K, the information in this Item 2.02 and Exhibit 99.1 hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, nor shall it be deemed incorporated by reference in any of the Registrant’s filings under the Securities Act of 1933, as amended, or the Exchange Act, whether made before or after the date hereof, regardless of any incorporation language in such a filing, except as expressly set forth by specific reference in such a filing. ​ Item 9.01 Financial Statements and Exhibits. ​ (d) Exhibits ​

​

​

Exhibit ​

Number ​ Exhibit Description

99.1 ​ Press Release, dated February 26, 2026.

104 ​ The cover page from Aclaris Therapeutics, Inc.’s Form 8-K filed on February 26, 2026, formatted in Inline XBRL.

​ ​ ​

2

​

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. ​ ​

​

​

​ ​

ACLARIS THERAPEUTICS, INC.

​ ​ ​

Date: February 26, 2026 By: /s/ Kevin Balthaser

​ Kevin Balthaser Chief Financial Officer

​ ​ ​

3

Aclaris Therapeutics, Inc._November 6, 2025 0001557746false00015577462025-11-062025-11-06 ​

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): November 6, 2025 ​

​ Aclaris Therapeutics, Inc. (Exact name of registrant as specified in its charter) ​ ​

​

​

​

​

Delaware ​ 001-37581 ​ 46-0571712

(State or other jurisdiction of incorporation) ​ (Commission File Number) ​ (IRS Employer Identification No.)

​ 701 Lee Road, Suite 103 Wayne, PA 19087 (Address of principal executive offices, including zip code) ​ (484) 324-7933 (Registrant’s telephone number, including area code) ​ 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 Class:

Trading Symbol(s)

Name of Each Exchange on which Registered

Common Stock, $0.00001 par value

ACRS

The 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 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. ☐ ​ ​

Item 2.02 Results of Operations and Financial Condition. ​ On November 6, 2025, Aclaris Therapeutics, Inc. (the “Registrant”) issued a press release announcing its financial results for the quarter and nine months ended September 30, 2025. A copy of this press release is furnished herewith as Exhibit 99.1 to this Current Report. ​ In accordance with General Instruction B.2. of Form 8-K, the information in this Item 2.02 and Exhibit 99.1 hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, nor shall it be deemed incorporated by reference in any of the Registrant’s filings under the Securities Act of 1933, as amended, or the Exchange Act, whether made before or after the date hereof, regardless of any incorporation language in such a filing, except as expressly set forth by specific reference in such a filing. ​ Item 9.01 Financial Statements and Exhibits. ​ (d) Exhibits ​

​

​

Exhibit ​

Number ​ Exhibit Description

99.1 ​ Press Release, dated November 6, 2025.

104 ​ The cover page from Aclaris Therapeutics, Inc.’s Form 8-K filed on November 6, 2025, formatted in Inline XBRL.

​ ​ ​

2

​

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. ​

​

​

​ ​

ACLARIS THERAPEUTICS, INC.

​ ​ ​

Date: November 6, 2025 By: /s/ Kevin Balthaser

​ Kevin Balthaser Chief Financial Officer

​ ​ ​

3