Korsana Biosciences, Inc.
KRSA- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001755237
No open-market purchases or sales by Korsana Biosciences, Inc. insiders were filed in the last 90 days; 21 institutions reported holding it in 13F filings for Q2 2026, worth $11.2M in total; no superinvestor holds it.
Holders of 5% or more of KRSA
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Korsana Biosciences, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Fairmount Funds Management LLC | 13D | 19.99%9.11M shares | New | Sep 11, 20261 filing | Sep 11, 2026 | SEC |
| Hecht Peter M | 13D/A | 19.40%910.2K shares | −8.50 ppfrom 27.90% | May 14, 20219 filings | Jul 20, 2026 | SEC |
| FMR LLC | 13G | 15.00%649.5K shares | +14.80 ppfrom 0.20% | Feb 8, 20216 filings | May 7, 2026 | SEC |
| Venrock Healthcare Capital Partners III, L.P. | 13D | 9.90%4.55M shares | New | Sep 15, 20261 filing | Sep 15, 2026 | SEC |
| Balyasny Asset Management LLC | 13G | 7.33%317.5K shares | New | Aug 14, 20261 filing | Aug 14, 2026 | SEC |
| ADAR1 Capital Management, LLC | 13G | 7.00%298.8K shares | New | Aug 14, 20261 filing | Aug 14, 2026 | SEC |
| General Atlantic LLC | 13G | 6.80%3.20M shares | New | Sep 18, 20261 filing | Sep 18, 2026 | SEC |
| Wellington Biomedical Innovation Master Investors (Cayman) II L.P. | 13G | 6.10%2.78M shares | New | Sep 16, 20261 filing | Sep 16, 2026 | SEC |
| J. Wood Capital Advisors LLC | 13G | 5.40%181.8K shares | New | Oct 17, 20251 filing | Oct 17, 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
40 Schedule 13D and 13G filings on Korsana Biosciences, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Sep 18, 20267:20 PM ET | General Atlantic LLCand 16 others | 13G | 6.80%3.20M shares | New | Sep 8, 2026 | SEC |
| Sep 16, 20267:55 AM ET | Wellington Biomedical Innovation Master Investors (Cayman) II L.P. | 13G | 6.10%2.78M shares | New | Sep 9, 2026 | SEC |
| Sep 15, 20264:56 PM ET | Venrock Healthcare Capital Partners III, L.P.and 8 others | 13D | 9.90%4.55M shares | New | Sep 8, 2026 | SEC |
| Sep 11, 20265:25 PM ET | Fairmount Funds Management LLCand 4 others | 13D | 19.99%9.11M shares | New | Sep 8, 2026 | SEC |
| Aug 14, 20269:29 PM ET | ADAR1 Capital Management, LLCand 1 other | 13G | 7.00%298.8K shares | New | Jun 30, 2026 | SEC |
| Aug 14, 20266:02 AM ET | Balyasny Asset Management LLCand 4 others | 13G | 7.33%317.5K shares | New | Jun 30, 2026 | SEC |
| Jul 20, 20267:50 PM ET | Hecht Peter M | 13D/A | 19.40%910.2K shares | −8.50 ppfrom 27.90% | Jul 16, 2026 | SEC |
| May 7, 202610:42 AM ET | FMR LLCand 1 other | 13G | 15.00%649.5K shares | +14.80 ppfrom 0.20% | Apr 30, 2026 | SEC |
| Oct 17, 20254:05 PM ET | J. Wood Capital Advisors LLCand 1 other | 13G | 5.40%181.8K shares | New | Mar 25, 2025 | SEC |
| Aug 14, 20254:05 PM ET | Tyndall Capital Partners L P | 13G/A | 4.80%155.2K shares | −0.30 ppfrom 5.10%Below 5% | Jun 30, 2025 | SEC |
| May 15, 20254:15 PM ET | Tyndall Capital Partners L P | 13G/A | 5.10%164.8K shares | – | Mar 31, 2025 | SEC |
| Mar 28, 20259:47 PM ET | Hecht Peter M | 13D/A | 27.90%1.03M shares | – | Mar 25, 2025 | SEC |
| Feb 12, 20253:36 PM ET | MFN Partners Management, LPand 5 others | 13G/A | 0.00%0 shares | –Below 5% | Dec 31, 2024 | SEC |
| Feb 12, 20251:25 PM ET | American Endowment Foundation | 13G/A | 4.91%133.0K shares | –Below 5% | Dec 31, 2024 | SEC |
| Feb 12, 20259:28 AM ET | FMR LLCand 1 other | 13G/A | 0.20%4.74K shares | –Below 5% | Dec 31, 2024 | SEC |
| Dec 6, 20244:05 PM ET | Slate Path Capital LPand 1 other | 13G/A | 0.00%0 shares | –Below 5% | Nov 30, 2024 | SEC |
| Jul 12, 2024 | Artal International S.C.A. | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2024 | Tyndall Capital Partners L P | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2024 | Artal International S.C.A. | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2024 | FMR LLC | 13G/AOld format | – | – | – | SEC |
| Jan 22, 2024 | Slate Path Capital LP | 13G/AOld format | – | – | – | SEC |
| Dec 5, 2023 | Hecht Peter M | 13D/AOld format | – | – | – | SEC |
| Sep 5, 2023 | Tyndall Capital Partners L P | 13GOld format | – | New | – | SEC |
| May 23, 2023 | Hecht Peter M | 13D/AOld format | – | – | – | SEC |
| May 12, 2023 | Hecht Peter M | 13D/AOld format | – | – | – | SEC |
| Apr 3, 2023 | Hecht Peter M | 13D/AOld format | – | – | – | SEC |
| Feb 9, 2023 | FMR LLC | 13G/AOld format | – | – | – | SEC |
| Jan 13, 2023 | Slate Path Capital LP | 13GOld format | – | – | – | SEC |
| Nov 21, 2022 | Hecht Peter M | 13D/AOld format | – | – | – | SEC |
| Oct 21, 2022 | Slate Path Capital LP | 13DOld format | – | – | – | SEC |
| Feb 11, 2022 | Artal International S.C.A. | 13G/AOld format | – | – | – | SEC |
| Feb 11, 2022 | Slate Path Capital LP | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2022 | MFN Partners, LP | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2022 | FMR LLC | 13G/AOld format | – | – | – | SEC |
| Jun 7, 2021 | Hecht Peter M | 13D/AOld format | – | – | – | SEC |
| May 14, 2021 | Hecht Peter M | 13DOld format | – | New | – | SEC |
| Feb 16, 2021 | Artal International S.C.A. | 13G/AOld format | – | – | – | SEC |
| Feb 12, 2021 | MFN Partners Management, LP | 13GOld format | – | New | – | SEC |
| Feb 8, 2021 | FMR LLC | 13G/AOld format | – | – | – | SEC |
| Feb 5, 2021 | American Endowment Foundation | 13G/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Korsana Biosciences, Inc. shares.
No Form 144 notices for Korsana Biosciences, Inc. are on file.