Adagio Medical Holdings, Inc.
ADGM- Exchange
- Nasdaq
- Industry
- Surgical & Medical Instruments & Apparatus
- SEC CIK
- 0002006986
No open-market purchases or sales by Adagio Medical Holdings, Inc. insiders were filed in the last 90 days; 24 institutions reported holding it in 13F filings for Q2 2026, worth $9.83M in total; no superinvestor holds it.
Holders of 5% or more of ADGM
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Adagio Medical Holdings, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Perceptive Advisors LLC | 13G/A | 55.40%15.3M shares | −2.10 ppfrom 57.50% | Feb 14, 20253 filings | May 15, 2026 | SEC |
| Alyeska Investment Group, L.P. | 13G | 9.90%2.10M shares | New | Feb 17, 20261 filing | Feb 17, 2026 | SEC |
| Ra Capital Management, L.P. | 13G/A | 7.20%1.20M shares | +7.20 ppfrom 0.00% | Feb 14, 20254 filings | Aug 26, 2025 | SEC |
| Adage Capital Management, L.P. | 13G/A | 5.67%1.26M shares | −1.21 ppfrom 6.88% | Aug 12, 20253 filings | May 13, 2026 | SEC |
| ADAR1 Capital Management, LLC | 13G/A | 5.40%1.21M shares | −0.30 ppfrom 5.70% | Feb 17, 20262 filings | Aug 14, 2026 | 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
15 Schedule 13D and 13G filings on Adagio Medical Holdings, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 14, 20265:04 PM ET | ADAR1 Capital Management, LLCand 1 other | 13G/A | 5.40%1.21M shares | −0.30 ppfrom 5.70% | Jun 30, 2026 | SEC |
| Jul 28, 20264:49 PM ET | Sio Capital Management, LLC | 13G/A | 3.15%699.0K shares | −2.93 ppfrom 6.08%Below 5% | Jun 30, 2026 | SEC |
| May 15, 20264:00 PM ET | Perceptive Advisors LLCand 3 others | 13G/A | 55.40%15.3M shares | −2.10 ppfrom 57.50% | Mar 31, 2026 | SEC |
| May 13, 20269:00 AM ET | Adage Capital Management, L.P.and 2 others | 13G/A | 5.67%1.26M shares | −1.21 ppfrom 6.88% | Mar 31, 2026 | SEC |
| Feb 17, 20268:13 PM ET | ADAR1 Capital Management, LLCand 1 other | 13G | 5.70%1.21M shares | New | Dec 31, 2025 | SEC |
| Feb 17, 20264:32 PM ET | Alyeska Investment Group, L.P.and 2 others | 13G | 9.90%2.10M shares | New | Dec 31, 2025 | SEC |
| Feb 17, 20264:00 PM ET | Perceptive Advisors LLCand 3 others | 13G/A | 57.50%15.3M shares | −16.10 ppfrom 73.60% | Dec 31, 2025 | SEC |
| Feb 11, 20264:39 PM ET | Sio Capital Management, LLC | 13G | 6.08%1.29M shares | New | Dec 31, 2025 | SEC |
| Nov 13, 20259:04 AM ET | Adage Capital Management, L.P.and 2 others | 13G/A | 6.88%1.06M shares | +1.54 ppfrom 5.34% | Sep 30, 2025 | SEC |
| Aug 26, 20254:59 PM ET | Ra Capital Management, L.P.and 3 others | 13G/A | 7.20%1.20M shares | +7.20 ppfrom 0.00% | Jun 30, 2025 | SEC |
| Aug 14, 20255:53 PM ET | Ra Capital Management, L.P.and 3 others | 13G/A | 0.00%0 shares | −7.20 ppfrom 7.20%Below 5% | Jun 30, 2025 | SEC |
| Aug 12, 20259:06 AM ET | Adage Capital Management, L.P.and 2 others | 13G | 5.34%821.3K shares | New | Jun 30, 2025 | SEC |
| May 15, 20254:48 PM ET | Ra Capital Management, L.P.and 3 others | 13G/A | 7.20%1.20M shares | −2.70 ppfrom 9.90% | Mar 31, 2025 | SEC |
| Feb 14, 20256:31 PM ET | Ra Capital Management, L.P.and 3 others | 13G/A | 9.90%1.61M shares | – | Dec 31, 2024 | SEC |
| Feb 14, 20254:15 PM ET | Perceptive Advisors LLCand 3 others | 13G/A | 73.60%15.3M shares | – | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Adagio Medical Holdings, Inc. shares.
No Form 144 notices for Adagio Medical Holdings, Inc. are on file.