Larimar Therapeutics, Inc.
LRMR- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001374690
In the last 90 days, Larimar Therapeutics, Inc. insiders filed 1 open-market purchase 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.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Flynn James E | 13D/A | 35.81%30.7M shares | – | Jul 31, 20251 filing | Jul 31, 2025 | SEC |
| Millennium Management LLC | 13G/A | 5.80%4.97M shares | +0.20 ppfrom 5.60% | Jun 17, 20252 filings | Nov 6, 2025 | SEC |
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
11 Schedule 13D and 13G filings on Larimar Therapeutics, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Nov 6, 20254:17 PM ET | Millennium Management LLCand 2 others | 13G/A | 5.80%4.97M shares | +0.20 ppfrom 5.60% | Sep 30, 2025 | SEC |
| Aug 29, 20254:05 PM ET | Opaleye Management Inc.and 2 others | 13G | 4.80%4.11M shares | −1.37 ppfrom 6.17%Below 5% | Aug 29, 2025 | SEC |
| Aug 14, 202510:47 AM ET | Janus Henderson Group PLC | 13G/A | 0.00%0 shares | −9.10 ppfrom 9.10%Below 5% | Mar 31, 2025 | SEC |
| Jul 31, 20256:26 PM ET | Flynn James Eand 9 others | 13D/A | 35.81%30.7M shares | – | Jul 31, 2025 | SEC |
| Jun 17, 20254:12 PM ET | Millennium Management LLCand 2 others | 13G | 5.60%3.56M shares | New | Jun 12, 2025 | SEC |
| May 14, 202512:25 PM ET | Janus Henderson Group PLCand 1 other | 13G/A | 9.10%3.36M shares | −1.00 ppfrom 10.10% | Mar 31, 2025 | SEC |
| May 13, 202511:33 AM ET | Goldman Sachs Group Incand 1 other | 13G/A | 4.10%2.60M shares | –Below 5% | Mar 31, 2025 | SEC |
| Apr 22, 20252:28 PM ET | BlackRock, Inc. | 13G/A | 4.80%3.08M shares | −0.30 ppfrom 5.10%Below 5% | Mar 31, 2025 | SEC |
| Apr 16, 20255:11 PM ET | Opaleye Management Inc.and 2 others | 13G | 6.17%3.95M shares | New | Apr 9, 2025 | SEC |
| Feb 4, 20253:45 PM ET | BlackRock, Inc. | 13G | 5.10%3.27M shares | New | Dec 31, 2024 | SEC |
| Jan 8, 202511:49 AM ET | Janus Henderson Group PLCand 1 other | 13G/A | 10.10%6.44M shares | – | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Larimar Therapeutics, Inc. shares.
No Form 144 notices for Larimar Therapeutics, Inc. are on file.