Keros Therapeutics, Inc.: which funds bought and sold

Institutions that bought and sold Keros 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, 61 institutions that filed 13F reports for both quarters added to or opened positions in Keros Therapeutics, and 79 cut or closed them. Together they added a net 1.4M shares, +7.5% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 1.2M shares (+14.5%); index fund managers were net buyers of 39K shares (+0.7%). 15 opened a new position and 29 sold out entirely.

Bought, Q2 2026 61 institutions, 15 of them new holders Sold, Q2 2026 79 institutions, 29 of them sold out

Net change, all compared +1.4M shares (+7.5%)

Net change, active managers +1.2M shares (+14.5%), 17 bought, 20 sold

Buyers versus sellers

institutions compared, 159

61 bought 19 79 sold

Active managers and hedge funds 17 bought · 20 sold · +1.2M

Index fund managers 3 bought · 6 sold · +39K

Other institutions 41 bought · 53 sold · +140K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Nantahala Capital Management, LLC Hedge fund	+1.5M +107.4%	2.8M	$30.2M
AQR Capital Management LLC Hedge fund	+561K +138.1%	968K	$10.4M
Mackenzie Financial Corp	+476K +312.2%	628K	$6.7M
Blackrock, Inc. Index funds	+382K +15.9%	2.8M	$29.9M
ADAR1 Capital Management, LLC Hedge fund	+150K +153.6%	247K	$2.6M
Dimensional Fund Advisors LP	+139K +43.3%	461K	$4.9M
O'Shaughnessy Asset Management, LLC Active manager	+126K New position	126K	$1.4M
Millennium Management LLC Hedge fund	+78K +73.0%	185K	$2M
Jane Street Group, LLC	+71K +159.3%	115K	$1.2M
Bridgeway Capital Management, LLC Active manager	+70K +35.9%	265K	$2.8M
Jain Global LLC Hedge fund	+59K New position	59K	$633,536
Ieq Capital, LLC	+56K New position	56K	$595,723
Acadian Asset Management LLC Active manager	+50K +76.7%	116K	$1.2M
Susquehanna Portfolio Strategies, LLC	+45K New position	45K	$479,617
BNP Paribas Financial Markets	+43K +622.1%	50K	$533,406
Marshall Wace, LLP Hedge fund	+35K New position	35K	$370,220
Squarepoint Ops LLC Hedge fund	+31K New position	31K	$333,883
Barclays PLC	+27K +114.6%	50K	$531,832
Mariner, LLC	+25K +181.3%	39K	$416,218
Panagora Asset Management Inc Active manager	+21K +61.5%	56K	$599,040

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Nantahala Capital Management, LLC Hedge fund	+1.5M +107.4%	2.8M	$30.2M
AQR Capital Management LLC Hedge fund	+561K +138.1%	968K	$10.4M
ADAR1 Capital Management, LLC Hedge fund	+150K +153.6%	247K	$2.6M
O'Shaughnessy Asset Management, LLC Active manager	+126K New position	126K	$1.4M
Millennium Management LLC Hedge fund	+78K +73.0%	185K	$2M
Bridgeway Capital Management, LLC Active manager	+70K +35.9%	265K	$2.8M
Jain Global LLC Hedge fund	+59K New position	59K	$633,536
Acadian Asset Management LLC Active manager	+50K +76.7%	116K	$1.2M
Marshall Wace, LLP Hedge fund	+35K New position	35K	$370,220
Squarepoint Ops LLC Hedge fund	+31K New position	31K	$333,883

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Arrowstreet Capital, Limited Partnership Hedge fund	−357K −60.5%	233K	$2.5M
D. E. Shaw & Co., Inc. Hedge fund	−242K −47.5%	267K	$2.9M
Geode Capital Management, LLC Index funds	−171K −25.0%	511K	$5.5M
Connor, Clark & Lunn Investment Management Ltd.	−130K −50.4%	128K	$1.4M
Two Sigma Investments, LP Hedge fund	−117K −32.2%	247K	$2.6M
Y-Intercept (Hong Kong) Ltd	−116K −70.7%	48K	$515,483
Qube Research & Technologies Ltd Hedge fund	−116K −16.0%	609K	$6.5M
Jacobs Levy Equity Management, Inc Active manager	−101K −14.3%	605K	$6.5M
Northern Trust Corp Index funds	−100K −39.5%	154K	$1.6M
Point72 Asset Management, L.P. Hedge fund	−99K −90.5%	10K	$111,205
Renaissance Technologies LLC Hedge fund	−94K −20.8%	359K	$3.8M
Los Angeles Capital Management LLC Active manager	−88K −51.0%	84K	$902,781
Man Group PLC Hedge fund	−83K −34.8%	156K	$1.7M
HRT Financial LP	−77K Sold out	0	—
Strs Ohio	−51K Sold out	0	—
Goldman Sachs Group Inc	−47K −20.8%	178K	$1.9M
Morgan Stanley	−45K −36.1%	79K	$848,366
Globeflex Capital L P	−38K Sold out	0	—
Winton Group Ltd Hedge fund	−36K Sold out	0	—
Jump Financial, LLC	−35K −69.4%	15K	$164,780

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Arrowstreet Capital, Limited Partnership Hedge fund	−357K −60.5%	233K	$2.5M
D. E. Shaw & Co., Inc. Hedge fund	−242K −47.5%	267K	$2.9M
Two Sigma Investments, LP Hedge fund	−117K −32.2%	247K	$2.6M
Qube Research & Technologies Ltd Hedge fund	−116K −16.0%	609K	$6.5M
Jacobs Levy Equity Management, Inc Active manager	−101K −14.3%	605K	$6.5M
Point72 Asset Management, L.P. Hedge fund	−99K −90.5%	10K	$111,205
Renaissance Technologies LLC Hedge fund	−94K −20.8%	359K	$3.8M
Los Angeles Capital Management LLC Active manager	−88K −51.0%	84K	$902,781
Man Group PLC Hedge fund	−83K −34.8%	156K	$1.7M
Winton Group Ltd Hedge fund	−36K Sold out	0	—

New positions

largest by value

Institution	Shares	Value June 30, 2026
O'Shaughnessy Asset Management, LLCActive manager	126K	$1.4M
Jain Global LLCHedge fund	59K	$633,536
Ieq Capital, LLC	56K	$595,723
Susquehanna Portfolio Strategies, LLC	45K	$479,617
Marshall Wace, LLPHedge fund	35K	$370,220
Squarepoint Ops LLCHedge fund	31K	$333,883
Wealth Enhancement Advisory Services, LLC	18K	$210,524
Cerity Partners LLC	18K	$195,822
Nverses Capital, LLC	13K	$140,426
Integrated Wealth Concepts LLC	1,587	$16,983

Sold out

largest by value

Institution	Shares	Value March 31, 2026
HRT Financial LP	77K	$850,000
Strs Ohio	51K	$558,624
Globeflex Capital L P	38K	$418,118
Winton Group LtdHedge fund	36K	$402,220
Aviva PLC	34K	$378,749
Magnetar Financial LLCHedge fund	30K	$332,138
Tudor Investment Corp Et AlHedge fund	28K	$309,197
Simplex Trading, LLC	22K	$246,059
Fox Run Management, L.L.C.	23K	$243,397
Franklin Resources IncActive manager	22K	$240,186

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 131
Ten largest holders: 57.1%
Index fund managers: 29.1%
Active managers and hedge funds: 47.8%

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	17	20	4	7	+1.2M	+14.5%
Index fund managers	3	6	0	0	+39K	+0.7%
Other institutions	41	53	11	22	+140K	+3.1%

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 Keros Therapeutics.

Only managers that filed a holdings report for both quarters are compared (159 here). 6 other holders are 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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