Kevin Balthaser - 31 Dec 2025 Form 4 Insider Report for Aclaris Therapeutics, Inc. (ACRS)

Role: Chief Financial Officer
Signature: /s/ Matthew Rothman, Attorney-in-Fact
Issuer symbol: ACRS
Transactions as of: 31 Dec 2025
Net transactions value: -$79,622
Form type: 4
Filing time: 05 Jan 2026, 16:27:39 UTC
Previous filing: 04 Mar 2025
Next filing: 03 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Balthaser Kevin	Chief Financial Officer	C/O ACLARIS THERAPEUTICS, INC., 701 LEE ROAD, SUITE 103, WAYNE	/s/ Matthew Rothman, Attorney-in-Fact	05 Jan 2026	0001957554

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ACRS	Common Stock	Options Exercise		+73,750	+80%		166,358	31 Dec 2025	Direct	F1
transaction	ACRS	Common Stock	Tax liability	$60,001	-19,934	-12%	$3.01	146,424	31 Dec 2025	Direct	F2
transaction	ACRS	Common Stock	Options Exercise		+7,500	+5.1%		153,924	01 Jan 2026	Direct	F1
transaction	ACRS	Common Stock	Tax liability	$6,772	-2,250	-1.5%	$3.01	151,674	01 Jan 2026	Direct	F2
transaction	ACRS	Common Stock	Options Exercise		+13,200	+8.7%		164,874	02 Jan 2026	Direct	F1
transaction	ACRS	Common Stock	Tax liability	$12,848	-4,461	-2.7%	$2.88	160,413	02 Jan 2026	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	ACRS	Restricted Stock Units	Options Exercise	$0	-73,750	-100%	$0.000000	0	31 Dec 2025	Common Stock	73,750		Direct	F1, F3
transaction	ACRS	Restricted Stock Units	Options Exercise	$0	-7,500	-50%	$0.000000	7,500	01 Jan 2026	Common Stock	7,500		Direct	F1, F4
transaction	ACRS	Restricted Stock Units	Options Exercise	$0	-13,200	-49%	$0.000000	13,600	02 Jan 2026	Common Stock	13,200		Direct	F1, F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each restricted stock unit represents a contingent right to receive one share of common stock of the issuer.
F2	The transaction reported represents the withholding of shares by the issuer to satisfy the Reporting Person's tax withholding obligations in connection with the vesting and settlement of restricted stock units described in this Form 4.
F3	50% of the shares underlying these restricted stock units vested on each of December 31, 2024 and December 31, 2025.
F4	The shares underlying these restricted stock units vest in four equal installments on the first, second, third and fourth anniversaries of January 1, 2023, subject to the Continuous Service of the Reporting Person (as defined in the Plan) as of each such date.
F5	The shares underlying these restricted stock units vest as to 33% on January 2, 2025, 33% on January 2, 2026, and 34% on January 2, 2027, subject to the Continuous Service (as defined in the Plan) of the Reporting Person as of each such date.