Latest Period
Q1 2026
Security Snapshot
Atrium Therapeutics, Inc. - Common Stock (RNAM) Institutional Ownership
CUSIP: 05370A108
13F Institutional Holders and Ownership History from Q2 2020 to Q1 2026
Institutions Reporting
1
Shares (Excl. Options)
8,000
Price
$29.52
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- Type / Class
- Equity / Common Stock
- Symbol
- RNAM
- Shares outstanding
- 150,858,761
- Price per share
- $29.52
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 8,000
- Total reported value
- $236,160
- Share change
- -130,358,697
- Value change
- -$9,401,918,423
- Number of holders
- 1
- Price from insider filings
- $29.52
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- RNAM - Atrium Therapeutics, Inc. - Common Stock is tracked under CUSIP 05370A108.
- 1 institution reported positions in Q1 2026.
- 9 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 341 to 1 between Q4 2025 and Q1 2026.
- Reported value moved from $10,796,419,907 to $236,160.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 1 institution filings for Q1 2026.
Investment Quick Answers
What is CUSIP 05370A108?
CUSIP 05370A108 identifies RNAM - Atrium Therapeutics, Inc. - Common Stock in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q1 2026 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 05370A108:
Significant Owners of Atrium Therapeutics, Inc. - Common Stock (RNAM) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| VANGUARD GROUP INC | 9.6% | $575,984,900 | 13,219,759 | The Vanguard Group | 30 Sep 2025 | |||
| RA CAPITAL MANAGEMENT, L.P. | 5.9% | $376,489,721 | 8,641,031 | RA Capital Management, L.P. | 30 Sep 2025 | |||
| BlackRock, Inc. | 6.4% | -14% | $376,086,262 | -$17,916,333 | 8,631,771 | -4.5% | BlackRock, Inc. | 30 Sep 2025 |
| Avoro Capital Advisors LLC | 5.5% | $614,244,077 | 8,515,792 | Avoro Capital Advisors LLC | 31 Dec 2025 | |||
| JANUS HENDERSON GROUP PLC | 4.6% | -15% | $500,546,351 | -$92,717,850 | 6,939,503 | -16% | JANUS HENDERSON GROUP PLC | 31 Dec 2025 |
| RTW INVESTMENTS, LP | 3.1% | $204,173,813 | 4,686,110 | RTW Investments, LP | 27 Oct 2025 | |||
| FMR LLC | 2.1% | -86% | $128,911,093 | -$809,934,537 | 2,958,712 | -86% | FMR LLC | 31 Oct 2025 |
| WELLINGTON MANAGEMENT GROUP LLP | 0.5% | -95% | $52,158,501 | -$646,388,523 | 723,118 | -93% | Wellington Management Group LLP | 31 Dec 2025 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 0.1% | -100% | $10,306,511 | -$695,695,581 | 142,888 | -99% | T. Rowe Price Associates, Inc. | 31 Dec 2025 |
As of 31 Mar 2026, 1 institutional investors reported holding 8,000 shares of Atrium Therapeutics, Inc. - Common Stock (RNAM). This represents 0.01% of the company’s total 150,858,761 outstanding shares.
Institutional Holders of Atrium Therapeutics, Inc. - Common Stock (RNAM) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 8,000 | $236,160 | -$9,401,918,423 | $29.52 | 1 |
| 2025 Q4 | 149,687,562 | $10,796,419,907 | -$37,749,318 | $72.13 | 341 |
| 2025 Q3 | 160,911,766 | $7,009,507,783 | +$1,158,007,539 | $43.57 | 269 |
| 2025 Q2 | 135,973,420 | $3,861,676,519 | +$69,697,401 | $28.40 | 205 |
| 2025 Q1 | 133,409,309 | $3,962,056,176 | +$178,442,627 | $29.52 | 218 |
| 2024 Q4 | 127,638,993 | $3,712,638,686 | -$78,035,782 | $29.08 | 234 |
| 2024 Q3 | 126,231,192 | $5,796,026,453 | +$574,015,774 | $45.93 | 240 |
| 2024 Q2 | 111,913,147 | $4,571,667,339 | +$938,038,576 | $40.85 | 191 |
| 2024 Q1 | 89,252,994 | $2,277,667,387 | +$376,305,703 | $25.52 | 156 |
| 2023 Q4 | 75,910,042 | $687,025,653 | -$46,186,576 | $9.05 | 142 |
| 2023 Q3 | 81,744,893 | $521,542,443 | -$6,429,051 | $6.38 | 142 |
| 2023 Q2 | 82,383,646 | $913,636,020 | +$45,839,329 | $11.09 | 140 |
| 2023 Q1 | 75,916,643 | $1,165,169,505 | +$49,763,836 | $15.35 | 138 |
| 2022 Q4 | 71,661,062 | $1,590,188,145 | +$426,293,719 | $22.19 | 148 |
| 2022 Q3 | 53,433,471 | $872,653,344 | -$22,171,694 | $16.33 | 121 |
| 2022 Q2 | 52,143,220 | $757,668,637 | +$70,638,105 | $14.53 | 107 |
| 2022 Q1 | 47,057,452 | $869,011,980 | +$27,227,715 | $18.47 | 98 |
| 2021 Q4 | 45,418,262 | $1,079,557,657 | +$3,680,968 | $23.77 | 104 |
| 2021 Q3 | 44,395,070 | $1,093,343,381 | +$240,851,131 | $24.63 | 108 |
| 2021 Q2 | 34,505,931 | $852,616,782 | +$16,849,564 | $24.71 | 93 |
| 2021 Q1 | 33,888,914 | $739,147,936 | +$60,802,116 | $21.81 | 97 |
| 2020 Q4 | 30,963,803 | $790,224,311 | +$74,813,975 | $25.52 | 82 |
| 2020 Q3 | 27,022,951 | $755,460,115 | +$43,834,764 | $28.15 | 67 |
| 2020 Q2 | 25,458,553 | $701,864,000 | +$701,864,000 | $28.26 | 52 |