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ATRIUM THERAP (RNA)
NASDAQ
$12.90-$0.04 (-0.35%)
Price as of Jun 23, 2026 1:44 PM EDT- $221.3MMarket Cap
- -55.61%1-Year Change
- BiotechnologyIndustry
ATRIUM THERAP (RNA)
$12.90-$0.04 (-0.35%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
VANGUARD GROUP INC | 79.79% | 13.6M | +429,491 (+3.15%) | Dec 31, 2025 |
RTW INVESTMENTS, LP | 66.49% | 11.4M | +1.8M (+15.42%) | Sep 30, 2025 |
BLACKROCK FUNDING, INC. /DE | 58.06% | 9.9M | +205,447 (+2.07%) | Dec 31, 2024 |
BLACKROCK INC. | 50.41% | 8.6M | +2.5M (+28.49%) | Jun 30, 2024 |
AVORO CAPITAL ADVISORS LLC | 31.89% | 5.5M | -2.2M (-40.15%) | Dec 31, 2025 |
RTW INVESTMENTS, LLC | 28.03% | 4.8M | 0 (0.00%) | Dec 31, 2021 |
HBK INVESTMENTS L P | 25.52% | 4.4M | +4.4M (+100.00%) | Dec 31, 2025 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
FIDELITY CONTRAFUND | 6.44% | 1.1M | 0 (0.00%) | Mar 31, 2026 |
VANGUARD INDEX FUNDS | 5.11% | 873,423 | +873,423 (+100.00%) | Mar 31, 2026 |
T. Rowe Price Health Sciences Fund, Inc. | 3.90% | 666,325 | +666,325 (+100.00%) | Mar 31, 2026 |
T. Rowe Price New Horizons Fund, Inc. | 2.59% | 443,462 | +443,462 (+100.00%) | Mar 31, 2026 |
iSHARES TRUST | 2.43% | 415,527 | +415,527 (+100.00%) | Mar 31, 2026 |
LORD ABBETT DEVELOPING GROWTH FUND, INC. | 2.38% | 406,719 | 0 (0.00%) | Jan 31, 2026 |
ACAP Strategic Fund | 2.23% | 382,045 | 0 (0.00%) | Mar 31, 2026 |
Current Ownership Distribution
- Institutions1.7B (79.87%)
- Mutual Funds405.0M (19.59%)
- Insiders11.2M (0.54%)
- Other0 (0.00%)
Insider Transactions
- 0.54% (11.2M)Current InsiderOwnership (%, shares)
- 0Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 9Number of InsiderSelling (last 12 months)
- $209.6MAmount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
Kim Jean Jinsun | Return | Feb 27, 2026 | $0.00 | 10,034 | $0.00 | 0 |
Thompson Tamar | Return | Feb 27, 2026 | $0.00 | 10,034 | $0.00 | 0 |
Calderaro Charles III Chief Technical Officer | Return | Feb 27, 2026 | $0.00 | 80,000 | $0.00 | 0 |
Henig Noreen | Return | Feb 27, 2026 | $0.00 | 10,034 | $0.00 | 0 |
McCarthy Teresa Chief Human Resources Officer | Return | Feb 27, 2026 | $0.00 | 106,000 | $0.00 | 0 |
WILSON TROY EDWARD | Return | Feb 27, 2026 | $0.00 | 10,034 | $0.00 | 0 |
MacLean Michael F Chief Financial Officer | Return | Feb 27, 2026 | $0.00 | 92,000 | $0.00 | 0 |
Boyce Sarah President and CEO | Return | Feb 27, 2026 | $0.00 | 386,015 | $0.00 | 0 |
Kim Jean Jinsun | Return | Feb 27, 2026 | $0.00 | 13,489 | $0.00 | 0 |
Moriarty John B Chief Legal Officer | Return | Feb 27, 2026 | $0.00 | 50,000 | $0.00 | 0 |
Calderaro Charles III Chief Technical Officer | Return | Feb 27, 2026 | $0.00 | 98,547 | $0.00 | 0 |
BOESS CARSTEN | Return | Feb 27, 2026 | $0.00 | 10,034 | $0.00 | 0 |
Flanagan W. Michael Chief Scientific Officer | Return | Feb 27, 2026 | $0.00 | 25,000 | $0.00 | 0 |
Mosbrooker Eric Chief Commercial Officer | Return | Feb 27, 2026 | $0.00 | 177,188 | $0.00 | 0 |
LEVIN ARTHUR A | Return | Feb 27, 2026 | $0.00 | 10,034 | $0.00 | 0 |
Boyce Sarah President and CEO | Return | Feb 27, 2026 | $0.00 | 300,000 | $0.00 | 0 |
Kim Jean Jinsun | Return | Feb 27, 2026 | $0.00 | 22,000 | $0.00 | 0 |
Thompson Tamar | Return | Feb 27, 2026 | $0.00 | 13,489 | $0.00 | 0 |
Hughes Steven George Chief Medical Officer | Return | Feb 27, 2026 | $0.00 | 73,342 | $0.00 | 0 |
Henig Noreen | Return | Feb 27, 2026 | $0.00 | 13,489 | $0.00 | 0 |
McCarthy Teresa Chief Human Resources Officer | Return | Feb 27, 2026 | $0.00 | 65,000 | $0.00 | 0 |
WILSON TROY EDWARD | Return | Feb 27, 2026 | $0.00 | 13,489 | $0.00 | 0 |
MacLean Michael F Chief Financial Officer | Return | Feb 27, 2026 | $0.00 | 131,250 | $0.00 | 0 |
Boyce Sarah President and CEO | Return | Feb 27, 2026 | $0.00 | 425,000 | $0.00 | 0 |
Kim Jean Jinsun | Return | Feb 27, 2026 | $0.00 | 22,000 | $0.00 | 0 |
Moriarty John B Chief Legal Officer | Return | Feb 27, 2026 | $0.00 | 160,000 | $0.00 | 0 |
Hughes Steven George Chief Medical Officer | Return | Feb 27, 2026 | $0.00 | 74,000 | $0.00 | 0 |
BOESS CARSTEN | Return | Feb 27, 2026 | $0.00 | 13,489 | $0.00 | 0 |
Flanagan W. Michael Chief Scientific Officer | Return | Feb 27, 2026 | $0.00 | 66,500 | $0.00 | 0 |
Skerjanec Simona | Return | Feb 27, 2026 | $0.00 | 10,034 | $0.00 | 0 |