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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- Security type / class
- Equity / Common Stock
- Symbol
- RNAM
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 8,000
- Total 13F value
- $236,160
- Share change
- -130,557,710
- Value change
- -$9,416,273,231
- Number of holders
- 1
- Shares outstanding
- 150,858,761
- SEC-reported price per share
- $29.52
- Insider filing price
- $29.52
Latest holder snapshot
4 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- 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.
Change
- Holder count moved from 341 to 1 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $10,796,419,907 to $236,160.
Research use
- 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.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 1 institution filings for Q1 2026.
Security key
05370A108
Latest holder period
Q1 2026
13F holders
1
13D/G owners
9
CIK / CUSIP context first
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 05370A108:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
9
Security
RNAM
| 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.
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
24
Latest
Q1 2026
Rows shown
1-24 of 24
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 8,000 | $236,160 | -$9,416,273,231 | $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 |