ADAGIO MED HLDGS INC ADGM
COM · Common Stock · CUSIP 00534B100
- SectorHealth care
- IndustrySurgical & Medical Instruments & Apparatus
- HeadquartersLaguna Hills, CA
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Shares outstanding: 22.2m as of 2026-08-10, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $0.65.
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2024 | 13 |
| Q4 2024 | 16 |
| Q1 2025 | 16 |
| Q2 2025 | 13 |
| Q3 2025 | 15 |
| Q4 2025 | 21 |
| Q1 2026 | 23 |
| Q2 2026 | 24 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2024 | 8 | 4 |
| Q1 2025 | 7 | 5 |
| Q2 2025 | 7 | 7 |
| Q3 2025 | 5 | 5 |
| Q4 2025 | 16 | 7 |
| Q1 2026 | 8 | 5 |
| Q2 2026 | 9 | 8 |
Biggest buyers
| VANGUARD CAPITAL MANAGEMENT LLC | Added | +69.3k |
| CITADEL ADVISORS LLC | New | +16.2k |
| HRT FINANCIAL LP | New | +13.7k |
| CITIGROUP INC | Added | +13.3k |
| NORTHERN TRUST CORP | Added | +9.3k |
| Tower Research Capital LLC (TRC) | Added | +4.3k |
| UBS Group AG | New | +2.3k |
| BARCLAYS PLC | New | +23 |
| PERCEPTIVE ADVISORS LLC | Added | +10 |
Biggest sellers
| Sio Capital Management, LLC | Reduced | -589.5k |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | -46.1k |
| SILVERARC CAPITAL MANAGEMENT, LLC | Reduced | -27.6k |
| Granite Investment Partners, LLC | Sold out | -27.1k |
| RENAISSANCE TECHNOLOGIES LLC | Sold out | -16.6k |
| XTX Topco Ltd | Reduced | -5.2k |
| BANK OF AMERICA CORP /DE/ | Reduced | -1.3k |
| JPMORGAN CHASE & CO | Sold out | -975 |
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| PERCEPTIVE ADVISORS LLC 13G · passive investor -2.1 pts · filed 2026-05-15 | 55.4% |
| Alyeska Investment Group, L.P. 13G · institution new · filed 2026-02-17 | 9.9% |
| RA CAPITAL MANAGEMENT, L.P. 13G · passive investor +7.2 pts · filed 2025-08-26 | 7.2% |
| Adage Capital Management, L.P. 13G · institution -1.2 pts · filed 2026-05-13 | 5.7% |
| ADAR1 Capital Management, LLC 13G · institution -0.3 pts · filed 2026-08-14 | 5.4% |
Fell to 5% or below in the last year: Sio Capital Management, LLC (3.1%, 2026-07-28)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 2 | $244.0k | 0 | — | — |
| Q1 2026 | 0 | — | 0 | — | — |
| Q2 2026 | 0 | — | 0 | — | — |
| Q3 2026 | 0 | — | 0 | — | — |
None reported since 1 Apr 2026.
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| PERCEPTIVE ADVISORS LLC 0.10% of their portfolio | 9.9m $6.4m | Added +10 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.00% of their portfolio | 1.3m $820.0k | Unchanged |
| ADAR1 Capital Management, LLC 0.04% of their portfolio | 1.2m $785.5k | Unchanged |
| Alyeska Investment Group, L.P. 0.00% of their portfolio | 1.2m $755.6k | Unchanged |
| Sio Capital Management, LLC 0.08% of their portfolio | 699.0k $455.5k | Reduced -589.5k |
| SILVERARC CAPITAL MANAGEMENT, LLC 0.02% of their portfolio | 224.4k $146.2k | Reduced -27.6k |
| Shaolin Capital Management LLC 0.01% of their portfolio | 171.2k $111.5k | Unchanged |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 109.0k $71.0k | Added +69.3k |
| Affinity Asset Advisors, LLC 0.00% of their portfolio | 80.0k $52.1k | Unchanged |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 79.1k $51.5k | Reduced -46.1k |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 53.8k $35.1k | Unchanged |
| NORTHERN TRUST CORP 0.00% of their portfolio | 30.9k $20.1k | Added +9.3k |
| TORONTO DOMINION BANK 0.00% of their portfolio | 25.0k $16.3k | Unchanged |
| Opaleye Management Inc. 0.00% of their portfolio | 18.4k $13.4k | Unchanged |
| XTX Topco Ltd 0.00% of their portfolio | 18.2k $11.8k | Reduced -5.2k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 16.2k $10.5k | New |
| HRT FINANCIAL LP 0.00% of their portfolio | 13.7k $8.0k | New |
| CITIGROUP INC 0.00% of their portfolio | 13.3k $8.6k | Added +13.3k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 11.5k $7.5k | Reduced -1.3k |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 6.5k $4.2k | Added +4.3k |
| UBS Group AG 0.00% of their portfolio | 2.3k $1.5k | New |
| Crewe Advisors LLC 0.00% of their portfolio | 500 $326 | Unchanged |
| MORGAN STANLEY 0.00% of their portfolio | 137 $89 | Unchanged |
| BARCLAYS PLC 0.00% of their portfolio | 23 $15 | New |