Y-mAbs Therapeutics, Inc.
YMABDelisted Sep 16, 2025- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001722964
Y-mAbs Therapeutics, Inc. was delisted on Sep 16, 2025; its insiders filed their last Form 4 on Sep 19, 2025; 97 institutions reported holding it in 13F filings for Q2 2025, worth $125.9M in total; no superinvestor held it.
Holders of 5% or more of YMAB
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Y-mAbs Therapeutics, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Acorn Bioventures, L.P. | 13G/A | 6.20%2.80M shares | −0.80 ppfrom 7.00% | Aug 15, 20252 filings | Aug 20, 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
10 Schedule 13D and 13G filings on Y-mAbs Therapeutics, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Nov 14, 20254:31 PM ET | Paradigm Biocapital Advisors LPand 3 others | 13G/A | 0.00%0 shares | –Below 5% | Sep 30, 2025 | SEC |
| Nov 14, 20254:06 PM ET | HBM Healthcare Investments (Cayman) Ltd. | 13G/A | 0.00%0 shares | –Below 5% | Sep 30, 2025 | SEC |
| Nov 14, 20252:34 PM ET | Caligan Partners LPand 1 other | 13G/A | 0.00%0 shares | −5.20 ppfrom 5.20%Below 5% | Sep 30, 2025 | SEC |
| Nov 14, 20252:33 PM ET | Beryl Capital Management LLCand 3 others | 13G/A | 0.00%0 shares | −9.00 ppfrom 9.00%Below 5% | Sep 30, 2025 | SEC |
| Nov 13, 20254:52 PM ET | Glazer Capital, LLCand 1 other | 13G/A | 0.00%0 shares | −5.84 ppfrom 5.84%Below 5% | Sep 30, 2025 | SEC |
| Aug 20, 202512:32 PM ET | Acorn Bioventures, L.P.and 4 others | 13G/A | 6.20%2.80M shares | −0.80 ppfrom 7.00% | Aug 19, 2025 | SEC |
| Aug 15, 20254:28 PM ET | Glazer Capital, LLCand 1 other | 13G | 5.84%2.65M shares | New | Aug 8, 2025 | SEC |
| Aug 15, 202510:31 AM ET | Acorn Bioventures, L.P.and 4 others | 13G/A | 7.00%3.10M shares | – | Aug 14, 2025 | SEC |
| Aug 12, 20254:16 PM ET | Beryl Capital Management LLCand 3 others | 13G | 9.00%4.09M shares | New | Aug 5, 2025 | SEC |
| May 14, 20258:41 AM ET | Caligan Partners LPand 1 other | 13G | 5.20%2.34M shares | New | Mar 31, 2025 | SEC |
| Feb 14, 2023 | HBM Healthcare Investments (Cayman) Ltd. | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2023 | WG Biotech ApS | 13GOld format | – | New | – | SEC |
| Feb 9, 2023 | Vanguard Group Inc | 13GOld format | – | New | – | SEC |
| Apr 11, 2022 | Wellington Management Group LLP | 13G/AOld format | – | – | – | SEC |
| Feb 15, 2022 | Sofinnova Venture Partners X, L.P. | 13D/AOld format | – | – | – | SEC |
| Feb 7, 2022 | HBM Healthcare Investments (Cayman) Ltd. | 13G/AOld format | – | – | – | SEC |
| Feb 4, 2022 | Wellington Management Group LLP | 13G/AOld format | – | – | – | SEC |
| Feb 3, 20224:41 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jul 12, 2021 | Wellington Management Group LLP | 13G/AOld format | – | – | – | SEC |
| Feb 12, 2021 | HBM Healthcare Investments (Cayman) Ltd. | 13G/AOld format | – | – | – | SEC |
| Feb 4, 2021 | Wellington Management Group LLP | 13G/AOld format | – | – | – | SEC |
| Feb 2, 20213:13 PM ET | BlackRock Inc. | 13GOld format | – | New | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Y-mAbs Therapeutics, Inc. shares.
No Form 144 notices for Y-mAbs Therapeutics, Inc. are on file.