Larimar Therapeutics, Inc.: which funds bought and sold

Institutions that bought and sold Larimar 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, 100 institutions that filed 13F reports for both quarters added to or opened positions in Larimar Therapeutics, and 69 cut or closed them. Together they added a net 7.8M shares, +8.9% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 20K shares (−0.0%); index fund managers were net buyers of 4.5M shares (+45.4%). 32 opened a new position and 29 sold out entirely.

Bought, Q2 2026 100 institutions, 32 of them new holders Sold, Q2 2026 69 institutions, 29 of them sold out

Net change, all compared +7.8M shares (+8.9%)

Net change, active managers −20K shares (−0.0%), 24 bought, 17 sold

Buyers versus sellers

institutions compared, 190

100 bought 21 69 sold

Active managers and hedge funds 24 bought · 17 sold · −20K

Index fund managers 11 bought · 0 sold · +4.5M

Other institutions 65 bought · 52 sold · +3.3M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Defilade Capital Management, L.P.	+3.7M New position	3.7M	$11.2M
Blue Owl Capital Holdings LP	+2.0M +28.7%	9.2M	$27.9M
Blackrock, Inc. Index funds	+1.9M +51.3%	5.7M	$17.3M
AQR Capital Management LLC Hedge fund	+1.6M +190.1%	2.4M	$7.2M
Marshall Wace, LLP Hedge fund	+1.1M +115.6%	2.0M	$6.1M
RTW Investments, LP Hedge fund	+1.1M +71.1%	2.6M	$7.8M
Vanguard Portfolio Management LLC Index funds	+997K +245.1%	1.4M	$4.3M
Citadel Advisors LLC Hedge fund	+938K +180.6%	1.5M	$4.4M
Sphera Funds Management Ltd.	+926K New position	926K	$2.8M
FMR LLC Active manager	+874K +1374.5%	937K	$2.9M
Qube Research & Technologies Ltd Hedge fund	+793K +93.6%	1.6M	$5M
Geode Capital Management, LLC Index funds	+570K +51.4%	1.7M	$5.1M
State Street Corp Index funds	+500K +54.9%	1.4M	$4.3M
Hennion & Walsh Asset Management, Inc.	+397K New position	397K	$1.2M
Los Angeles Capital Management LLC Active manager	+382K +2117.0%	400K	$1.2M
Driehaus Capital Management LLC Active manager	+229K +7.8%	3.2M	$9.6M
Nuveen, LLC	+220K +32.7%	895K	$2.7M
ADAR1 Capital Management, LLC Hedge fund	+220K +417.1%	273K	$831,872
Goldman Sachs Group Inc	+191K +12.3%	1.8M	$5.3M
Northern Trust Corp Index funds	+174K +46.2%	550K	$1.7M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
AQR Capital Management LLC Hedge fund	+1.6M +190.1%	2.4M	$7.2M
Marshall Wace, LLP Hedge fund	+1.1M +115.6%	2.0M	$6.1M
RTW Investments, LP Hedge fund	+1.1M +71.1%	2.6M	$7.8M
Citadel Advisors LLC Hedge fund	+938K +180.6%	1.5M	$4.4M
FMR LLC Active manager	+874K +1374.5%	937K	$2.9M
Qube Research & Technologies Ltd Hedge fund	+793K +93.6%	1.6M	$5M
Los Angeles Capital Management LLC Active manager	+382K +2117.0%	400K	$1.2M
Driehaus Capital Management LLC Active manager	+229K +7.8%	3.2M	$9.6M
ADAR1 Capital Management, LLC Hedge fund	+220K +417.1%	273K	$831,872
Squarepoint Ops LLC Hedge fund	+113K New position	113K	$346,096

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Aigh Capital Management LLC	−3.0M Sold out	0	—
Millennium Management LLC Hedge fund	−2.3M −63.2%	1.3M	$4.1M
Deep Track Capital, LP Hedge fund	−1.5M Sold out	0	—
Point72 Asset Management, L.P. Hedge fund	−913K −87.1%	135K	$411,158
Soleus Capital Management, L.P. Hedge fund	−879K −82.4%	188K	$573,711
D. E. Shaw & Co., Inc. Hedge fund	−576K Sold out	0	—
Gem Investment Advisors, LLC	−535K −62.6%	320K	$974,533
Jane Street Group, LLC	−480K −86.7%	74K	$224,895
Renaissance Technologies LLC Hedge fund	−442K −59.8%	297K	$907,201
Caption Management, LLC	−442K −69.6%	193K	$588,705
Morgan Stanley	−334K −79.4%	87K	$264,917
Adage Capital Partners Gp, L.L.C. Hedge fund	−300K Sold out	0	—
Hudson Bay Capital Management LP Hedge fund	−281K −96.2%	11K	$33,550
Two Sigma Investments, LP Hedge fund	−239K −50.4%	236K	$720,206
Jump Financial, LLC	−164K −54.8%	136K	$413,583
Wellington Management Group LLP Active manager	−137K Sold out	0	—
Seven Grand Managers, LLC	−125K Sold out	0	—
HRT Financial LP	−122K Sold out	0	—
Marex Group Ltd	−82K Sold out	0	—
Axq Capital, LP	−53K Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Millennium Management LLC Hedge fund	−2.3M −63.2%	1.3M	$4.1M
Deep Track Capital, LP Hedge fund	−1.5M Sold out	0	—
Point72 Asset Management, L.P. Hedge fund	−913K −87.1%	135K	$411,158
Soleus Capital Management, L.P. Hedge fund	−879K −82.4%	188K	$573,711
D. E. Shaw & Co., Inc. Hedge fund	−576K Sold out	0	—
Renaissance Technologies LLC Hedge fund	−442K −59.8%	297K	$907,201
Adage Capital Partners Gp, L.L.C. Hedge fund	−300K Sold out	0	—
Hudson Bay Capital Management LP Hedge fund	−281K −96.2%	11K	$33,550
Two Sigma Investments, LP Hedge fund	−239K −50.4%	236K	$720,206
Wellington Management Group LLP Active manager	−137K Sold out	0	—

New positions

largest by value

Institution	Shares	Value June 30, 2026
Defilade Capital Management, L.P.	3.7M	$11.2M
Sphera Funds Management Ltd.	926K	$2.8M
Hennion & Walsh Asset Management, Inc.	397K	$1.2M
Susquehanna Portfolio Strategies, LLC	165K	$503,726
Squarepoint Ops LLCHedge fund	113K	$346,096
Man Group PLCHedge fund	113K	$344,799
Cary Street Partners Financial LLC	85K	$259,250
Simplex Trading, LLC	59K	$178,754
Winton Group LtdHedge fund	52K	$159,820
Gsa Capital Partners LLP	50K	$153,000

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Aigh Capital Management LLC	3.0M	$13.5M
Deep Track Capital, LPHedge fund	1.5M	$6.8M
D. E. Shaw & Co., Inc.Hedge fund	576K	$2.6M
Adage Capital Partners Gp, L.L.C.Hedge fund	300K	$1.4M
Wellington Management Group LLPActive manager	137K	$614,386
Seven Grand Managers, LLC	125K	$562,500
HRT Financial LP	122K	$548,000
Marex Group Ltd	82K	$369,000
Axq Capital, LP	53K	$238,379
Virtu Financial LLC	52K	$233,000

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 162
Ten largest holders: 72.5%
Index fund managers: 15.1%
Active managers and hedge funds: 58.7%

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	24	17	8	8	−20K	−0.0%
Index fund managers	11	0	0	0	+4.5M	+45.4%
Other institutions	65	52	24	21	+3.3M	+15.4%

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 Larimar Therapeutics.

Only managers that filed a holdings report for both quarters are compared (190 here). 5 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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