Vault-13

ADAGIO MED HLDGS INC ADGM

COM · Common Stock · CUSIP 00534B100

24 institutional holders +1 vs Q1 2026
15,073,01915.1m shares reported held*
67.9% of all shares outstanding*
$9.8mreported value*
4 new 5 added 5 reduced 3 sold out net sold ≈ $382.8k (-586.0k shares)

* 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

0102030Q3 24: 13Q4 24: 16Q1 25: 16Q2 25: 13Q3 25: 15Q4 25: 21Q1 26: 23Q2 26: 2424Q3 24Q1 25Q3 25Q1 26Q2 26
Numbers
QuarterHolders
Q3 202413
Q4 202416
Q1 202516
Q2 202513
Q3 202515
Q4 202521
Q1 202623
Q2 202624

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
20020Q4 24: 8 bought or addedQ4 24: 4 cut or sold outQ4 24Q1 25: 7 bought or addedQ1 25: 5 cut or sold outQ2 25: 7 bought or addedQ2 25: 7 cut or sold outQ2 25Q3 25: 5 bought or addedQ3 25: 5 cut or sold outQ4 25: 16 bought or addedQ4 25: 7 cut or sold outQ4 25Q1 26: 8 bought or addedQ1 26: 5 cut or sold outQ2 26: 9 bought or addedQ2 26: 8 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q4 202484
Q1 202575
Q2 202577
Q3 202555
Q4 2025167
Q1 202685
Q2 202698

Biggest buyers

VANGUARD CAPITAL MANAGEMENT LLC Added +69,346+69.3k
CITADEL ADVISORS LLC New +16,155+16.2k
HRT FINANCIAL LP New +13,705+13.7k
CITIGROUP INC Added +13,254+13.3k
NORTHERN TRUST CORP Added +9,277+9.3k
Tower Research Capital LLC (TRC) Added +4,252+4.3k
UBS Group AG New +2,268+2.3k
BARCLAYS PLC New +23+23
PERCEPTIVE ADVISORS LLC Added +10+10

Biggest sellers

Sio Capital Management, LLC Reduced -589,472-589.5k
GEODE CAPITAL MANAGEMENT, LLC Reduced -46,126-46.1k
SILVERARC CAPITAL MANAGEMENT, LLC Reduced -27,612-27.6k
Granite Investment Partners, LLC Sold out -27,053-27.1k
RENAISSANCE TECHNOLOGIES LLC Sold out -16,557-16.6k
XTX Topco Ltd Reduced -5,197-5.2k
BANK OF AMERICA CORP /DE/ Reduced -1,326-1.3k
JPMORGAN CHASE & CO Sold out -975-975

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.

HolderStakeChangeShares Last filed
PERCEPTIVE ADVISORS LLC 13G · passive investor -2.1 pts · filed 2026-05-15 55.4% -2.1 pts 15.3m≈ $8.8m 2026-05-15
Alyeska Investment Group, L.P. 13G · institution new · filed 2026-02-17 9.9% new 2.1m≈ $1.4m 2026-02-17
RA CAPITAL MANAGEMENT, L.P. 13G · passive investor +7.2 pts · filed 2025-08-26 7.2% +7.2 pts 1.2m≈ $781.9k 2025-08-26
Adage Capital Management, L.P. 13G · institution -1.2 pts · filed 2026-05-13 5.7% -1.2 pts 1.3m≈ $820.0k 2026-05-13
ADAR1 Capital Management, LLC 13G · institution -0.3 pts · filed 2026-08-14 5.4% -0.3 pts 1.2m≈ $785.5k 2026-08-14

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)

BuyingSelling
202Q4 24: 0 buyingQ4 24: 0 sellingQ1 25: 0 buyingQ1 25: 0 sellingQ1 25Q2 25: 0 buyingQ2 25: 0 sellingQ3 25: 0 buyingQ3 25: 0 sellingQ3 25Q4 25: 2 buyingQ4 25: 0 sellingQ1 26: 0 buyingQ1 26: 0 sellingQ1 26Q2 26: 0 buyingQ2 26: 0 sellingQ3 26: 0 buyingQ3 26: 0 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20240—0——
Q1 20250—0——
Q2 20250—0——
Q3 20250—0——
Q4 20252$244.0k0——
Q1 20260—0——
Q2 20260—0——
Q3 20260—0——

None reported since 1 Apr 2026.

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 PERCEPTIVE ADVISORS LLC 0.10% of their portfolio NEW YORK, NY 9,876,5869.9m $6.4m $6.4m 0.10% Added +10 +10
2 ADAGE CAPITAL PARTNERS GP, L.L.C. 0.00% of their portfolio Boston, MA 1,258,5011.3m $820.0k $820.0k 0.00% Unchanged
3 ADAR1 Capital Management, LLC 0.04% of their portfolio AUSTIN, TX 1,205,4471.2m $785.5k $785.5k 0.04% Unchanged
4 Alyeska Investment Group, L.P. 0.00% of their portfolio CHICAGO, IL 1,159,6151.2m $755.6k $755.6k 0.00% Unchanged
5 Sio Capital Management, LLC 0.08% of their portfolio NEW YORK, NY 698,989699.0k $455.5k $455.5k 0.08% Reduced -589.5k -589,472
6 SILVERARC CAPITAL MANAGEMENT, LLC 0.02% of their portfolio BOSTON, MA 224,360224.4k $146.2k $146.2k 0.02% Reduced -27.6k -27,612
7 Shaolin Capital Management LLC 0.01% of their portfolio Miami, FL 171,170171.2k $111.5k $111.5k 0.01% Unchanged
8 VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio MALVERN, PA 108,954109.0k $71.0k $71.0k 0.00% Added +69.3k +69,346
9 Affinity Asset Advisors, LLC 0.00% of their portfolio NEW YORK, NY 80,00080.0k $52.1k $52.1k 0.00% Unchanged
10 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 79,11579.1k $51.5k $51.5k 0.00% Reduced -46.1k -46,126
11 VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio MALVERN, PA 53,78253.8k $35.1k $35.1k 0.00% Unchanged
12 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 30,87530.9k $20.1k $20.1k 0.00% Added +9.3k +9,277
13 TORONTO DOMINION BANK 0.00% of their portfolio TORONTO, ONTARIO, A6 25,00025.0k $16.3k $16.3k 0.00% Unchanged
14 Opaleye Management Inc. 0.00% of their portfolio BOSTON, MA 18,44418.4k $13.4k $13.4k 0.00% Unchanged
15 XTX Topco Ltd 0.00% of their portfolio LONDON, X0 18,15318.2k $11.8k $11.8k 0.00% Reduced -5.2k -5,197
16 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 16,15516.2k $10.5k $10.5k 0.00% New
17 HRT FINANCIAL LP 0.00% of their portfolio NEW YORK, NY 13,70513.7k $8.0k $8.0k 0.00% New
18 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 13,25513.3k $8.6k $8.6k 0.00% Added +13.3k +13,254
19 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 11,53111.5k $7.5k $7.5k 0.00% Reduced -1.3k -1,326
20 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 6,4546.5k $4.2k $4.2k 0.00% Added +4.3k +4,252
21 UBS Group AG 0.00% of their portfolio ZURICH, V8 2,2682.3k $1.5k $1.5k 0.00% New
22 Crewe Advisors LLC 0.00% of their portfolio SALT LAKE CITY, UT 500500 $326 $326 0.00% Unchanged
23 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 137137 $89 $89 0.00% Unchanged
24 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 2323 $15 $15 0.00% New