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Larimar Therapeutics, Inc.

LRMR
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001374690

In the last 90 days, Larimar Therapeutics, Inc. insiders filed 7 open-market purchases and 0 sales; 163 institutions reported holding it in 13F filings for Q2 2026, worth $291.4M in total; no superinvestor holds it.

Holders of 5% or more of LRMR

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Larimar Therapeutics, Inc., largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of LRMR
HolderLatest formStakeChangeFirst filedLatest filingFiling
Flynn James E13D/A34.41%35.7M shares−1.40 ppfrom 35.81%May 21, 202110 filingsMar 2, 2026SEC
Blue Owl Capital Holdings LP13G/A9.99%10.7M shares0.00 ppfrom 9.99%Feb 14, 20244 filingsMay 14, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

54 Schedule 13D and 13G filings on Larimar Therapeutics, Inc., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on LRMR
Filed (ET)FilerFormStakeChangeEvent dateFiling
May 14, 20264:23 PM ETBlue Owl Capital Holdings LP13G/A9.99%10.7M shares0.00 ppfrom 9.99%Mar 31, 2026SEC
Apr 30, 20266:17 PM ETMillennium Management LLCand 2 others13G/A3.50%3.63M shares−2.30 ppfrom 5.80%Below 5%Mar 31, 2026SEC
Mar 2, 20267:46 PM ETFlynn James Eand 9 others13D/A34.41%35.7M shares−1.40 ppfrom 35.81%Feb 27, 2026SEC
Feb 17, 20264:33 PM ETRa Capital Management, L.P.and 3 others13G/A0.00%0 shares–Below 5%Dec 31, 2025SEC
Feb 12, 20264:36 PM ETBlue Owl Capital Holdings LP13G/A9.99%8.46M shares–Dec 31, 2025SEC
Nov 6, 20254:17 PM ETMillennium Management LLCand 2 others13G/A5.80%4.97M shares+0.20 ppfrom 5.60%Sep 30, 2025SEC
Aug 29, 20254:05 PM ETOpaleye Management Inc.and 2 others13G4.80%4.11M shares−1.37 ppfrom 6.17%Below 5%Aug 29, 2025SEC
Aug 14, 202510:47 AM ETJanus Henderson Group PLC13G/A0.00%0 shares−9.10 ppfrom 9.10%Below 5%Mar 31, 2025SEC
Jul 31, 20256:26 PM ETFlynn James Eand 9 others13D/A35.81%30.7M shares–Jul 31, 2025SEC
Jun 17, 20254:12 PM ETMillennium Management LLCand 2 others13G5.60%3.56M sharesNewJun 12, 2025SEC
May 14, 202512:25 PM ETJanus Henderson Group PLCand 1 other13G/A9.10%3.36M shares−1.00 ppfrom 10.10%Mar 31, 2025SEC
May 13, 202511:33 AM ETGoldman Sachs Group Incand 1 other13G/A4.10%2.60M shares–Below 5%Mar 31, 2025SEC
Apr 22, 20252:28 PM ETBlackRock, Inc.13G/A4.80%3.08M shares−0.30 ppfrom 5.10%Below 5%Mar 31, 2025SEC
Apr 16, 20255:11 PM ETOpaleye Management Inc.and 2 others13G6.17%3.95M shares–Apr 9, 2025SEC
Feb 4, 20253:45 PM ETBlackRock, Inc.13G5.10%3.27M sharesNewDec 31, 2024SEC
Jan 8, 202511:49 AM ETJanus Henderson Group PLCand 1 other13G/A10.10%6.44M shares–Dec 31, 2024SEC
Nov 14, 2024Janus Henderson Group PLC13G/AOld format–––SEC
Nov 14, 2024Blue Owl Capital Holdings LP13G/AOld format–––SEC
Nov 14, 2024Verition Fund Management LLC13G/AOld format–––SEC
Nov 6, 2024Goldman Sachs Group Inc13GOld format–New–SEC
Mar 15, 2024Flynn James E13D/AOld format–––SEC
Feb 26, 2024Ra Capital Management, L.P.13GOld format–––SEC
Feb 16, 2024Flynn James E13D/AOld format–––SEC
Feb 15, 2024Flynn James E13D/AOld format–––SEC
Feb 14, 2024Perceptive Advisors LLC13G/AOld format–––SEC
Feb 14, 2024Blue Owl Capital Holdings LP13GOld format–New–SEC
Feb 14, 2024Verition Fund Management LLC13GOld format–New–SEC
Feb 13, 2024Janus Henderson Group PLC13G/AOld format–––SEC
Aug 18, 2023Janus Henderson Group PLC13GOld format–New–SEC
Mar 17, 2023Flynn James E13D/AOld format–––SEC
Feb 14, 2023Perceptive Advisors LLC13GOld format–New–SEC
Feb 13, 2023CHI Advisors LLC13G/AOld format–––SEC
Jan 23, 2023Opaleye Management Inc.13G/AOld format–––SEC
Nov 14, 2022Ra Capital Management, L.P.13G/AOld format–––SEC
Sep 16, 2022Flynn James E13D/AOld format–––SEC
Feb 18, 2022Opaleye Management Inc.13GOld format–New–SEC
Feb 15, 2022Acuta Capital Partners, LLC13G/AOld format–––SEC
Feb 14, 2022Ra Capital Management, L.P.13G/AOld format–––SEC
Feb 11, 2022Vivo Capital IX, LLC13G/AOld format–––SEC
Feb 11, 2022CHI Advisors LLC13G/AOld format–––SEC
Feb 11, 2022OrbiMed Advisors LLC13G/AOld format–––SEC
Jul 2, 2021Flynn James E13D/AOld format–––SEC
May 26, 2021Flynn James E13D/AOld format–––SEC
May 21, 2021Flynn James E13D/AOld format–––SEC
Mar 2, 2021CHI Advisors LLC13GOld format–New–SEC
Feb 16, 2021Acuta Capital Partners, LLC13GOld format–New–SEC
Feb 16, 2021Sio Capital Management, LLC13G/AOld format–––SEC
Feb 16, 2021Sphera Funds Management Ltd.13G/AOld format–––SEC
Feb 16, 2021Ra Capital Management, L.P.13GOld format–New–SEC
Feb 16, 2021683 Capital Management, LLC13G/AOld format–––SEC

Form 144: proposed insider sales

1 notice from officers, directors and other affiliates planning to sell Larimar Therapeutics, Inc. shares, newest first.

Form 144 notices for LRMR
Filed (ET)SellerShares to sellMarket valuePlanned saleBrokerFiling
Jul 24, 20235:46 PM ETBarrett PeterOfficer8.30K$26.8KJul 24, 2023ETRADE FINANCIAL CORPORATIONSEC