— Know what they know.
Not Investment Advice

RNA NASDAQ

Atrium Therapeutics, Inc.
1W: -1.7% 1M: -4.5% 3M: -82.1% YTD: -81.9% 1Y: -56.9% 3Y: +15.9% 5Y: -33.5%
$13.09
+0.05 (+0.38%)
 
Weekly Expected Move ±5.8%
$12 $12 $13 $14 $15
NASDAQ · Healthcare · Biotechnology · Alpha Radar Sell · Power 39 · $223.9M mcap · 16M float · 4.65% daily turnover · Short 41% of daily vol

🏦 Institutional Activity

Latest: Q1 2026
131
Institutions Holding
+0 vs prior
62.6%
Ownership
+62.65%
130 New
0 Increased
0 Reduced
0 Closed

👔 Insider Trades

25 records
Date Name Title Type Shares Price Value Filing
2026-04-20 Winslow Brendan R. officer: chief financial officer A-Grant/Award 30,000 $— $0 Filing
2026-04-20 Hughes Steven George officer: chief medical officer A-Grant/Award 30,000 $— $0 Filing
2026-04-20 Kenney Stephanie officer: see remarks A-Grant/Award 30,000 $— $0 Filing
2026-04-20 Younis Husam officer: chief scientific officer A-Grant/Award 30,000 $— $0 Filing
2026-04-20 Hoyos Rocio Martin officer: chief strategy officer A-Grant/Award 30,000 $— $0 Filing
2026-04-20 Gallagher Kathleen P. officer: see remarks A-Grant/Award 102,500 $— $0 Filing
2026-01-21 MacLean Michael F officer: chief financial officer S-Sale 2,735 $72.45 $198K Filing
2026-01-21 McCarthy Teresa officer: chief human resources officer S-Sale 1,476 $72.45 $107K Filing
2026-01-21 McCarthy Teresa officer: chief human resources officer S-Sale 1,453 $72.45 $105K Filing
2026-01-21 LEVIN ARTHUR A director S-Sale 1,758 $72.45 $127K Filing
2026-01-21 MacLean Michael F officer: chief financial officer S-Sale 1,807 $72.45 $131K Filing
2026-01-21 Flanagan W. Michael officer: chief scientific officer S-Sale 3,976 $72.45 $288K Filing
2026-01-21 Flanagan W. Michael officer: chief scientific officer S-Sale 2,558 $72.45 $185K Filing
2026-01-21 Boyce Sarah officer: president and ceo S-Sale 6,394 $72.45 $463K Filing
2026-01-21 Boyce Sarah officer: president and ceo S-Sale 7,993 $72.45 $579K Filing
2026-01-21 Hughes Steven George officer: chief medical officer S-Sale 2,017 $72.45 $146K Filing
2026-01-21 Hughes Steven George officer: chief medical officer S-Sale 2,878 $72.45 $209K Filing
2026-01-07 Boyce Sarah officer: president and ceo S-Sale 8,576 $72.23 $619K Filing
2026-01-07 Hughes Steven George officer: chief medical officer S-Sale 2,373 $72.23 $171K Filing
2026-01-07 Calderaro Charles III officer: chief technical officer S-Sale 3,727 $72.23 $269K Filing
2026-01-07 McCarthy Teresa officer: chief human resources officer S-Sale 1,965 $72.23 $142K Filing
2026-01-07 Moriarty John B officer: chief legal officer S-Sale 2,374 $72.23 $171K Filing
2026-01-07 MacLean Michael F officer: chief financial officer S-Sale 1,974 $72.23 $143K Filing
2026-01-07 Flanagan W. Michael officer: chief scientific officer S-Sale 2,373 $72.23 $171K Filing
2025-12-19 LEVIN ARTHUR A director G-Gift 1,330 $— $0 Filing

🏛️ Congressional Trades

0 records
Date Politician Chamber Type Amount Filing
No congressional trades found

🏦 Top Institutional Holders

20 holders
Holder Shares Value Date Reported Filing
BlackRock, Inc. 1,205,291 $16M +1,205,291 2026-03-31 Filing
RA CAPITAL MANAGEMENT, L.P. 864,102 $12M +864,102 2026-03-31 Filing
VANGUARD CAPITAL MANAGEMENT LLC 626,869 $8M +626,869 2026-03-31 Filing
Pentwater Capital Management LP 602,649 $8M +602,649 2026-03-31 Filing
O'Connor Alternative Investments LLC 578,011 $8M +578,011 2026-03-31 Filing
Sessa Capital IM, L.P. 551,391 $7M +551,391 2026-03-31 Filing
GOLDMAN SACHS GROUP INC 349,950 $5M +349,950 2026-03-31 Filing
FARALLON CAPITAL MANAGEMENT LLC 349,360 $5M +349,360 2026-03-31 Filing
VANGUARD PORTFOLIO MANAGEMENT LLC 344,369 $5M +344,369 2026-03-31 Filing
GEODE CAPITAL MANAGEMENT, LLC 319,831 $4M +319,831 2026-03-31 Filing
STATE STREET CORP 257,086 $3M +257,086 2026-03-31 Filing
Weiss Asset Management LP 240,701 $3M +240,701 2026-03-31 Filing
Balyasny Asset Management L.P. 235,115 $3M +235,115 2026-03-31 Filing
Squarepoint Ops LLC 231,466 $3M +231,466 2026-03-31 Filing
Arbiter Partners Capital Management LLC 230,000 $3M +230,000 2026-03-31 Filing
ADAGE CAPITAL PARTNERS GP, L.L.C. 183,580 $2M +183,580 2026-03-31 Filing
Slotnik Capital, LLC 180,945 $2M +180,945 2026-03-31 Filing
Schonfeld Strategic Advisors LLC 162,759 $2M +162,759 2026-03-31 Filing
NEXPOINT ASSET MANAGEMENT, L.P. 150,025 $2M +150,025 2026-03-31 Filing
Marble Bar Asset Management LLP 147,000 $2M +147,000 2026-03-31 Filing

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For informational purposes only. Not investment advice. Data sourced from SEC filings. Privacy Terms