Aclaris Therapeutics, Inc.: which funds bought and sold

Institutions that bought and sold Aclaris Therapeutics shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 96 institutions that filed 13F reports for both quarters added to or opened positions in Aclaris Therapeutics, and 45 cut or closed them. Together they added a net 10.6M shares, +9.6% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 3.8M shares (+9.4%); index fund managers were net buyers of 5.8M shares (+28.6%). 29 opened a new position and 14 sold out entirely.

Bought, Q2 2026 96 institutions, 29 of them new holders Sold, Q2 2026 45 institutions, 14 of them sold out

Net change, all compared +10.6M shares (+9.6%)

Net change, active managers +3.8M shares (+9.4%), 20 bought, 17 sold

Buyers versus sellers

institutions compared, 163

96 bought 22 45 sold

Active managers and hedge funds 20 bought · 17 sold · +3.8M

Index fund managers 10 bought · 2 sold · +5.8M

Other institutions 66 bought · 26 sold · +948K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
RA Capital Management, L.P. Hedge fund	+5.9M +87.0%	12.7M	$67.3M
Blackrock, Inc. Index funds	+2.6M +35.5%	10.0M	$53.1M
Silverarc Capital Management, LLC	+1.9M New position	1.9M	$10.3M
Jones Hill Capital LP	+1.8M New position	1.8M	$9.3M
State Street Corp Index funds	+1.2M +62.1%	3.3M	$17.2M
Panagora Asset Management Inc Active manager	+854K +170.0%	1.4M	$7.2M
Geode Capital Management, LLC Index funds	+766K +31.6%	3.2M	$16.9M
Mpm Bioimpact LLC	+651K +166.0%	1.0M	$5.5M
Vanguard Capital Management LLC Index funds	+650K +12.6%	5.8M	$30.8M
Kalehua Capital Management LLC	+495K +15.6%	3.7M	$19.4M
Braidwell LP Hedge fund	+443K +26.1%	2.1M	$11.3M
Orbimed Advisors LLC	+422K New position	422K	$2.2M
Tetragon Partners Gp Ltd	+400K New position	400K	$2.1M
Renaissance Technologies LLC Hedge fund	+315K +62.7%	818K	$4.3M
Vanguard Fiduciary Trust Co Index funds	+278K +44.3%	907K	$4.8M
Northern Trust Corp Index funds	+271K +37.2%	999K	$5.3M
Adage Capital Partners Gp, L.L.C. Hedge fund	+200K +5.2%	4.1M	$21.5M
Nuveen, LLC	+160K +135.9%	278K	$1.5M
Atom Investors LP	+149K New position	149K	$787,443
FMR LLC Active manager	+137K +78.0%	314K	$1.7M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
RA Capital Management, L.P. Hedge fund	+5.9M +87.0%	12.7M	$67.3M
Panagora Asset Management Inc Active manager	+854K +170.0%	1.4M	$7.2M
Braidwell LP Hedge fund	+443K +26.1%	2.1M	$11.3M
Renaissance Technologies LLC Hedge fund	+315K +62.7%	818K	$4.3M
Adage Capital Partners Gp, L.L.C. Hedge fund	+200K +5.2%	4.1M	$21.5M
FMR LLC Active manager	+137K +78.0%	314K	$1.7M
Woodline Partners LP Hedge fund	+125K +8.4%	1.6M	$8.5M
Hudson Bay Capital Management LP Hedge fund	+103K +613.4%	120K	$634,800
Acadian Asset Management LLC Active manager	+102K +6.6%	1.6M	$8.7M
Verition Fund Management LLC Hedge fund	+98K New position	98K	$518,420

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Morgan Stanley	−2.6M −95.1%	134K	$709,477
Bml Capital Management, LLC	−2.3M −16.0%	12.0M	$63.3M
Balyasny Asset Management L.P. Hedge fund	−1.3M −39.8%	2.0M	$10.7M
Marshall Wace, LLP Hedge fund	−713K Sold out	0	—
Monashee Investment Management LLC	−500K Sold out	0	—
Citadel Advisors LLC Hedge fund	−487K −21.7%	1.8M	$9.3M
D. E. Shaw & Co., Inc. Hedge fund	−486K −54.0%	414K	$2.2M
Logos Global Management LP Hedge fund	−300K −60.0%	200K	$1.1M
Two Sigma Investments, LP Hedge fund	−263K −66.4%	133K	$703,930
Bridgeway Capital Management, LLC Active manager	−255K −77.3%	75K	$396,851
Millennium Management LLC Hedge fund	−232K −30.7%	524K	$2.8M
Mackenzie Financial Corp	−213K Sold out	0	—
Connor, Clark & Lunn Investment Management Ltd.	−208K −14.7%	1.2M	$6.4M
Qube Research & Technologies Ltd Hedge fund	−195K Sold out	0	—
Vanguard Portfolio Management LLC Index funds	−190K −11.5%	1.5M	$7.8M
Rock Springs Capital Management LP Hedge fund	−142K −3.2%	4.3M	$22.9M
ADAR1 Capital Management, LLC Hedge fund	−132K Sold out	0	—
American Century Companies Inc Active manager	−119K Sold out	0	—
Superstring Capital Management LP	−109K −29.7%	258K	$1.4M
Xtx Topco Ltd	−98K Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Balyasny Asset Management L.P. Hedge fund	−1.3M −39.8%	2.0M	$10.7M
Marshall Wace, LLP Hedge fund	−713K Sold out	0	—
Citadel Advisors LLC Hedge fund	−487K −21.7%	1.8M	$9.3M
D. E. Shaw & Co., Inc. Hedge fund	−486K −54.0%	414K	$2.2M
Logos Global Management LP Hedge fund	−300K −60.0%	200K	$1.1M
Two Sigma Investments, LP Hedge fund	−263K −66.4%	133K	$703,930
Bridgeway Capital Management, LLC Active manager	−255K −77.3%	75K	$396,851
Millennium Management LLC Hedge fund	−232K −30.7%	524K	$2.8M
Qube Research & Technologies Ltd Hedge fund	−195K Sold out	0	—
Rock Springs Capital Management LP Hedge fund	−142K −3.2%	4.3M	$22.9M

New positions

largest by value

Institution	Shares	Value June 30, 2026
Silverarc Capital Management, LLC	1.9M	$10.3M
Jones Hill Capital LP	1.8M	$9.3M
Orbimed Advisors LLC	422K	$2.2M
Tetragon Partners Gp Ltd	400K	$2.1M
Atom Investors LP	149K	$787,443
Verition Fund Management LLCHedge fund	98K	$518,420
Voleon Capital Management LPHedge fund	77K	$408,219
Mangrove Partners Im, LLCHedge fund	50K	$266,039
Profund Advisors LLC	30K	$161,271
State Of Wyoming	27K	$145,152

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Marshall Wace, LLPHedge fund	713K	$2.7M
Monashee Investment Management LLC	500K	$1.9M
Mackenzie Financial Corp	213K	$800,269
Qube Research & Technologies LtdHedge fund	195K	$729,413
ADAR1 Capital Management, LLCHedge fund	132K	$496,598
American Century Companies IncActive manager	119K	$445,133
Xtx Topco Ltd	98K	$366,653
Entrypoint Capital, LLC	33K	$123,776
Engineers Gate Manager LPHedge fund	18K	$68,603
CIBC Asset Management Inc	17K	$65,355

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 149
Ten largest holders: 61.0%
Index fund managers: 21.6%
Active managers and hedge funds: 36.8%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	20	17	5	6	+3.8M	+9.4%
Index fund managers	10	2	1	0	+5.8M	+28.6%
Other institutions	66	26	23	8	+948K	+1.9%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Aclaris Therapeutics.

Only managers that filed a holdings report for both quarters are compared (163 here). 1 other holder is left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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