Adagio Medical Holdings, Inc (ADGM) Ownership
ADGM ownership summary
as of October 18, 2026- Institutions
- 54.9% of shares outstanding
- Insiders
- 1.02% of shares outstanding
- Shares outstanding
- 27.4M
- Float
- 8.5M shares available to trade
- Short interest
- 10.66% 1.3M shares short
- Days to cover
- 0.54 short interest up 211.8% vs prior month
- Institutions 54.93%
- Insiders 1.02%
- Other investors 44.05%
ADGM top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Perceptive Advisors LLC | 44.47% | 9.9M | $977,782 | +10 (+0.0%) | June 30, 2026 |
| 2 | Adage Capital Partners Gp LLC | 5.67% | 1.3M | $124,592 | — | June 30, 2026 |
| 3 | ADAR1 Capital Management LLC | 5.43% | 1.2M | $119,339 | — | June 30, 2026 |
| 4 | Alyeska Investment Group, L.P. | 5.22% | 1.2M | $114,802 | — | June 30, 2026 |
| 5 | Sio Capital Management, LLC | 3.15% | 699K | $69,200 | −589,472 (−45.8%) | June 30, 2026 |
| 6 | SILVERARC CAPITAL MANAGEMENT, LLC | 1.01% | 224K | $22,212 | −27,612 (−11.0%) | June 30, 2026 |
| 7 | Shaolin Capital Management LLC | 0.77% | 171K | $16,946 | — | June 30, 2026 |
| 8 | Vanguard Capital Management, LLC | 0.49% | 109K | $10,786 | +69,346 (+175.1%) | June 30, 2026 |
| 9 | Affinity Asset Advisors, LLC | 0.36% | 80K | $7,920 | — | June 30, 2026 |
| 10 | Geode Capital Management, LLC | 0.36% | 79K | $7,832 | −46,126 (−36.8%) | June 30, 2026 |
| 11 | Vanguard Fiduciary Trust Co | 0.24% | 54K | $5,324 | — | June 30, 2026 |
| 12 | Northern Trust Corp | 0.14% | 31K | $3,057 | +9,277 (+43.0%) | June 30, 2026 |
| 13 | The Toronto-Dominion Bank | 0.11% | 25K | $2,475 | — | June 30, 2026 |
| 14 | Opaleye Management Inc | 0.08% | 18K | $1,826 | — | June 30, 2026 |
| 15 | XTX Topco Ltd | 0.08% | 18K | $1,797 | −5,197 (−22.3%) | June 30, 2026 |
| 16 | Citadel Advisors Llc | 0.07% | 16K | $1,599 | +16,155 (0.0%) | June 30, 2026 |
| 17 | HRT FINANCIAL LLC | 0.06% | 14K | $1,357 | +13,705 (0.0%) | June 30, 2026 |
| 18 | Citigroup Inc | 0.06% | 13K | $1,312 | +13,254 (+1,325,400.0%) | June 30, 2026 |
| 19 | Bank of America Corp | 0.05% | 12K | $1,142 | −1,326 (−10.3%) | June 30, 2026 |
| 20 | Tower Research Capital LLC | 0.03% | 6,454 | $639 | +4,252 (+193.1%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 7 holders added 126K shares and 5 cut 670K.
ADGM top mutual fund and ETF holders
5 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Fidelity Nasdaq Composite Index | 2.59% | 576K | $57,016 | +575,923 (0.0%) | August 31, 2026 |
| 2 | Fidelity Extended Market Index | 0.23% | 50K | $4,999 | −271 (−0.5%) | August 31, 2026 |
| 3 | Fidelity Total Market Index | 0.08% | 18K | $1,818 | +18,364 (0.0%) | August 31, 2026 |
| 4 | Vanguard MStar Total Stk Mkt Idx Invest | 0.08% | 17K | $1,727 | — | August 31, 2026 |
| 5 | Fidelity Series Total Market Index | 0.05% | 10K | $1,030 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ADGM insider transactions
latest 2| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-12-16 | Deborah Kaster | Buy | $1.20 | 15,000 | $18,000 |
| 2025-12-12 | Todd Usen | Buy | $1.09 | 207,315 | $225,973 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
ADGM shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ADGM
Institutional investors own 54.9% of Adagio Medical's shares and insiders 1.02%. The largest holder is Perceptive Advisors LLC with 44.47% of the shares (9.9M), as of June 30, 2026. Among the top 20 institutions, 7 added shares and 5 reduced their stake in the latest filings. Short interest is 10.66% of the float, or 0.54 days of average trading volume. The share count rose 5.0% since 2021.
Related: ADGM analyst forecast, ADGM key metrics. See the ADGM stock overview for the latest quote and news.
ADGM ownership FAQ
Who owns the most Adagio Medical stock?
The largest shareholders of Adagio Medical are Perceptive Advisors LLC (44.47%), Adage Capital Partners Gp LLC (5.67%), ADAR1 Capital Management LLC (5.43%), Alyeska Investment Group, L.P. (5.22%), Sio Capital Management, LLC (3.15%).
What percentage of Adagio Medical is owned by institutions?
Institutions hold 54.9% of Adagio Medical's shares outstanding; insiders hold 1.02%.
Which funds own Adagio Medical?
The largest fund holders of Adagio Medical are Fidelity Nasdaq Composite Index (2.59%), Fidelity Extended Market Index (0.23%), Fidelity Total Market Index (0.08%), Vanguard MStar Total Stk Mkt Idx Invest (0.08%), Fidelity Series Total Market Index (0.05%).
What is Adagio Medical's short interest?
1.3M shares of Adagio Medical were sold short, 10.66% of the float; at the average daily volume it would take 0.54 days to cover.
Are insiders buying or selling Adagio Medical?
Of the latest 2 reported insider transactions in Adagio Medical (since December 12, 2025), 2 were purchases and 0 were sales.
How many shares of Adagio Medical are outstanding?
Adagio Medical has 27.4M shares outstanding, of which 8.5M are in the public float.