Atrium Therapeutics, Inc.
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SEC XBRL · annualNo structured XBRL financials available (common for pre-2009 filers, foreign issuers, or companies that never reported as a US public company).
5%+ owners
SEC Schedule 13D / 13G · last 3 yrs- Ra Capital Management, L.P.Passive (13G)May 15, 2026
- Blackrock, Inc.Passive (13G)Apr 27, 2026
- Price T Rowe Associates Inc /Md/Passive (13G)Apr 8, 2026
Holders who disclosed a 5%+ stake. 13D signals intent to influence or control; 13G is a passive holding. Latest filing per holder — open it for the exact stake.
Short interest
FINRA · bi-monthly| Settlement | Shares short | Days to cover | Δ vs prior |
|---|---|---|---|
| May 15, 2026 | 3.7M | 21.2 | +8.9% |
| Apr 30, 2026 | 3.4M | 8.7 | +13.6% |
| Apr 15, 2026 | 3.0M | 6.0 | +57.6% |
| Mar 31, 2026 | 1.9M | 2.9 | +61.5% |
| Mar 13, 2026 | 1.2M | 1.0 | +173.7% |
Shares sold short as reported to FINRA. Days-to-cover = short shares ÷ average daily volume — higher means more potential squeeze pressure.
Material events
SEC Form 8-K · most recent- Results of operationsMay 14, 2026
- Entered a material agreement · Change in control · Director / officer changeFeb 27, 2026
- Regulation FD disclosureFeb 26, 2026
Events the company reported on Form 8-K, labelled by the SEC item code it filed under — its own classification, not our interpretation.
Recent SEC filings
All filings ↗- SCHEDULE 13GMay 15, 2026
- 10-QMay 14, 2026
- 8-KMay 14, 2026
- SCHEDULE 13GApr 27, 2026
- 4Apr 22, 2026
- 4Apr 22, 2026
- 4Apr 22, 2026
- 4Apr 22, 2026
- 4Apr 22, 2026
- 4Apr 22, 2026
- S-8Apr 17, 2026
- SCHEDULE 13GApr 8, 2026
- 4Mar 2, 2026
- 4Mar 2, 2026
- 4Mar 2, 2026
Corporate family
Spun off from Avidity · Feb 17, 2026
From the spin-off filings we track. Follow a company to walk its own history.