ACRS · Aclaris Therapeutics, Inc. · Shareholders & Ownership

$3.77 +0.29 (+8.33%) At close · Oct 20

Russell 2000 member Rebalance outlook locked

Market Cap

$543.90M

147.20M

Volume · Oct 20 3.5M Avg daily vol (3M) 2.72M

Every disclosed holder of ACRS in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns ACRS

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	150	119,158,329	80.95%	Yes
Insiders (Forms 3, 4, 5)	14	17,599,183	11.96%	Yes
13D/G-only blocks	6	52,113,583	35.40%	Yes
Remaining	—	41,672,202	-28.31%	Negative
Registered funds (N-PORT, not summed)	133	19,145,554	13.01%	No

Shares outstanding: 147,198,893, the issuer's latest cover-page count restated onto today's split basis.

Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of ACRS

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	BML Investment Partners, L.P. 13G CIK 1373604 · Unknown · Apr 23, 2026 Rule 13d-1(c), passive investor	13,950,000	9.48%	-300,000	Apr 23, 2026	Rule 13d-1(c), passive investor
2	Leonard Braden Michael Insider CIK 1373603 · Apr 23, 2026 Insider, issuer-wide	13,950,000	9.48%	-300,000	Apr 23, 2026	Insider, issuer-wide
3	RA CAPITAL MANAGEMENT, L.P. 13F CIK 1346824 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	12,723,026	8.64%	+5,918,954	Jun 30, 2026	carried, not yet filed for the newest quarter
3.1	RA CAPITAL MANAGEMENT, L.P. 13G CIK 1346824 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(c), passive investor, not summed	12,723,026	8.64%	+5,096,321	Jun 30, 2026	Rule 13d-1(c), passive investor, not summed
4	BML Capital Management, LLC 13F CIK 1616824 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	11,975,000	8.14%	-2,275,000	Jun 30, 2026	carried, not yet filed for the newest quarter
5	Biosion, Inc. 13G CIK 2045933 · Nov 18, 2024	11,281,985	7.66%	—	Nov 18, 2024
6	Biosion, Inc. 13G CIK 2099513 · Unknown · Dec 9, 2025 Rule 13d-1(c), passive investor	11,281,950	7.66%	—	Dec 9, 2025	Rule 13d-1(c), passive investor
7	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	10,037,008	6.82%	+2,629,943	Jun 30, 2026	carried, not yet filed for the newest quarter
7.1	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	3,094,268	2.10%	+822,544	Jun 30, 2026	iShares Trust, not summed
7.2	iShares Russell 2000 Growth ETF Fund S000004343 · Registered fund · Jun 30, 2026 iShares Trust, not summed	960,785	0.65%	—	Jun 30, 2026	iShares Trust, not summed
7.3	iShares Biotechnology ETF Fund S000004350 · Registered fund · Jun 30, 2026 iShares Trust, not summed	778,135	0.53%	+12,123	Jun 30, 2026	iShares Trust, not summed
7.4	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	395,461	0.27%	+164,253	Jun 30, 2026	iShares Trust, not summed
7.5	iShares Core S&P Total U.S. Stock Market ETF Fund S000004317 · Registered fund · Jun 30, 2026 iShares Trust, not summed	273,629	0.19%	+6,528	Jun 30, 2026	iShares Trust, not summed
8	Deep Track Capital, LP 13F CIK 1856083 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	9,345,000	6.35%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
9	James N. Topper 13G CIK 1863769 · Unknown · Sep 14, 2026 Rule 13d-1(c), passive investor	7,879,943	5.35%	—	Sep 14, 2026	Rule 13d-1(c), passive investor
10	Vivo Capital, LLC 13F CIK 1674712 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	6,694,637	4.55%	+27,971	Jun 30, 2026	carried, not yet filed for the newest quarter
11	Vivo Opportunity Fund Holdings, L.P. 13G CIK 1930214 · Unknown · Mar 31, 2026 Rule 13d-1(c), passive investor	5,966,370	4.05%	-1,988,790	Mar 31, 2026	Rule 13d-1(c), passive investor
12	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	5,817,866	3.95%	+650,397	Jun 30, 2026	carried, not yet filed for the newest quarter
13	Frazier Life Sciences Management, L.P. 13F CIK 1892134 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,925,374	3.35%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
14	Rock Springs Capital Management LP 13F CIK 1595725 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,330,532	2.94%	-142,118	Jun 30, 2026	carried, not yet filed for the newest quarter
15	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	4,243,349	2.88%	+273,704	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
16	ADAGE CAPITAL PARTNERS GP, L.L.C. 13F CIK 1165408 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,071,000	2.77%	+200,000	Jun 30, 2026	carried, not yet filed for the newest quarter
17	Decheng Capital LLC 13F CIK 2010850 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	4,041,736	2.75%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
18	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	3,255,340	2.21%	+1,246,594	Jun 30, 2026	carried, not yet filed for the newest quarter
18.1	State Street(R) SPDR(R) S&P(R) Pharmaceuticals ETF Fund S000012321 · Registered fund · Jun 30, 2026 SPDR SERIES TRUST, not summed	723,948	0.49%	—	Jun 30, 2026	SPDR SERIES TRUST, not summed
18.2	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	35,000	0.02%	+4,200	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
18.3	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	2,992	0.00%	+813	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
18.4	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	654	0.00%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
19	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,190,058	2.17%	+766,367	Jun 30, 2026	carried, not yet filed for the newest quarter
20	BRAIDWELL LP 13F CIK 1920938 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,142,348	1.46%	+443,232	Jun 30, 2026	carried, not yet filed for the newest quarter
21	Balyasny Asset Management L.P. 13F CIK 1218710 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,023,470	1.37%	-1,337,858	Jun 30, 2026	carried, not yet filed for the newest quarter
22	SILVERARC CAPITAL MANAGEMENT, LLC 13F CIK 1816307 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,946,482	1.32%	+1,946,482	Jun 30, 2026	carried, not yet filed for the newest quarter
23	Kalehua Capital Management LLC 13F CIK 2106181 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,832,365	1.24%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
24	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,762,081	1.20%	-487,238	Jun 30, 2026	carried, not yet filed for the newest quarter
25	Jones Hill Capital LP 13F CIK 2102314 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,759,492	1.20%	+1,759,492	Jun 30, 2026	carried, not yet filed for the newest quarter
26	TANG CAPITAL MANAGEMENT, LLC 13G CIK 1191935 · Unknown · Dec 31, 2023 Rule 13d-1(c), passive investor	1,753,335	1.19%	-2,584,820	Dec 31, 2023	Rule 13d-1(c), passive investor
27	ACADIAN ASSET MANAGEMENT LLC 13F CIK 916542 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,641,472	1.12%	+101,681	Jun 30, 2026	carried, not yet filed for the newest quarter
28	Palo Alto Investors LP 13F CIK 1306923 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,613,430	1.10%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
29	Woodline Partners LP 13F CIK 1784547 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,611,054	1.09%	+125,431	Jun 30, 2026	carried, not yet filed for the newest quarter
30	Walker Neal Insider CIK 1604457 · Feb 3, 2026 Director, CEO, issuer-wide	1,543,886	1.05%	+44,864	Feb 3, 2026	Director, CEO, issuer-wide
31	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,465,735	1.00%	-190,331	Jun 30, 2026	carried, not yet filed for the newest quarter
32	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,449,603	0.98%	+353,075	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
33	PANAGORA ASSET MANAGEMENT INC 13F CIK 883677 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,356,152	0.92%	+853,862	Jun 30, 2026	carried, not yet filed for the newest quarter
34	Connor, Clark & Lunn Investment Management Ltd. 13F CIK 1596800 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,209,886	0.82%	-208,474	Jun 30, 2026	carried, not yet filed for the newest quarter
35	MPM BIOIMPACT LLC 13F CIK 1687078 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,042,467	0.71%	+650,549	Jun 30, 2026	carried, not yet filed for the newest quarter
36	DEUTSCHE BANK AG\ 13F CIK 948046 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	1,040,955	0.71%	+43,105	Jun 30, 2026	carried, not yet filed for the newest quarter
36.1	DWS Small Cap Index VIP Fund S000006223 · Registered fund · Jun 30, 2026 DEUTSCHE DWS INVESTMENTS VIT FUNDS, not summed	18,613	0.01%	+5,942	Jun 30, 2026	DEUTSCHE DWS INVESTMENTS VIT FUNDS, not summed
37	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	998,763	0.68%	+270,538	Jun 30, 2026	carried, not yet filed for the newest quarter
37.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	61,003	0.04%	+18,793	Jun 30, 2026	Northern Funds, not summed
38	Aldebaran Capital, LLC 13F CIK 1448430 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	936,731	0.64%	-10,431	Jun 30, 2026	carried, not yet filed for the newest quarter
39	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	907,173	0.62%	+278,314	Jun 30, 2026	carried, not yet filed for the newest quarter
40	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	817,531	0.56%	+314,900	Jun 30, 2026	carried, not yet filed for the newest quarter
41	Mehra Anand Insider CIK 1590102 · Jun 5, 2026 Director, issuer-wide	726,403	0.49%	+11,580	Jun 5, 2026	Director, issuer-wide
42	Three Bridge Wealth Advisors, LLC 13F CIK 1950962 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	714,823	0.49%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
43	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	609,158	0.41%	+20,467	Jun 30, 2026	carried, not yet filed for the newest quarter
43.1	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	34,128	0.02%	+17,921	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
44	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	523,895	0.36%	-232,232	Jun 30, 2026	carried, not yet filed for the newest quarter
45	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	513,840	0.35%	+2,379	Jun 30, 2026	carried, not yet filed for the newest quarter
45.1	Dimensional U.S. Small Cap ETF Fund S000070906 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	95,349	0.06%	+2,837	Jul 31, 2026	Dimensional ETF Trust, not summed
45.2	U.S. SMALL CAP PORTFOLIO Fund S000000971 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	91,639	0.06%	0	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
45.3	U.S. MICRO CAP PORTFOLIO Fund S000000948 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	42,636	0.03%	0	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
45.4	Dimensional US Core Equity Market ETF Fund S000069432 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	26,214	0.02%	0	Jul 31, 2026	Dimensional ETF Trust, not summed
45.5	Dimensional U.S. Core Equity 2 ETF Fund S000070903 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	21,533	0.01%	0	Jul 31, 2026	Dimensional ETF Trust, not summed
46	VANGUARD RUSSELL 2000 INDEX FUND Fund S000030003 · Registered fund · May 31, 2026 VANGUARD SCOTTSDALE FUNDS, not summed	472,249	0.32%	+16,332	May 31, 2026	VANGUARD SCOTTSDALE FUNDS, not summed
47	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	468,964	0.32%	-17,669	Jun 30, 2026	carried, not yet filed for the newest quarter
48	SCHIFF ANDREW N Insider CIK 1172252 · Jun 5, 2026 Director, issuer-wide	459,995	0.31%	+11,580	Jun 5, 2026	Director, issuer-wide
49	Aisling Capital Management LP 13F CIK 1766721 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	434,455	0.30%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
50	Bollard Group LLC 13F CIK 1556218 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	431,631	0.29%	0	Jun 30, 2026	carried, not yet filed for the newest quarter

11 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 229 holders

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Key facts CIK 1557746 CUSIP 00461U105 13F (30d) 12 filings 12 filers Visit website Investor relations