Atrium Therapeutics, Inc. (RNA) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

137,895,000Shares Outstanding

150,366,022Shares held by institutions

$0Value of institutional holdings

109.04%Institutional ownership %

19.67%Shares Changed QoQ

333No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Atrium Therapeutics, Inc. (NASDAQ:RNA) appears in 333 institutional 13F filings for the quarter ending December 2025.

These investors collectively held 102.3% of Atrium Therapeutics's outstanding shares in December 2025, down from 118.9% in September 2025.
Their total shares held in RNA increased 12.85% from the prior quarter, while the number of investors in Atrium Therapeutics increased 42.92% year over year.
Activity in RNA broke down as 220 buyers, 83 sellers, and 30 unchanged among 333 total holders.
In total, institutional investors held 141.1Mn shares in Atrium Therapeutics as of December 2025, up by 16.06Mn shares quarter on quarter, and up 11.31Mn shares year over year.
As of December 31, 2025, VANGUARD GROUP INC held the largest stake in Atrium Therapeutics with 13.65Mn shares, accounting for 9.9% of total shares outstanding.
The largest buyers of Atrium Therapeutics for the quarter ending December 2025 were BALYASNY ASSET MANAGEMENT L.P. (6.04Mn), Pentwater Capital Management LP (6.03Mn), Goldman Sachs Group Inc (5.82Mn), HBK INVESTMENTS L P (4.36Mn), BlackRock, Inc. (3.65Mn).
The biggest sellers of Atrium Therapeutics for the quarter ending December 2025 included FMR LLC (21.4Mn), WELLINGTON MANAGEMENT GROUP LLP (9.34Mn), Janus Henderson Group Plc (7.58Mn), Bank Of America Corp /De/ (2.74Mn), Pictet Asset Management Holding SA (1.25Mn).
Per Business Quant data, the top 10 holders of Atrium Therapeutics for the quarter ending December 2025 are VANGUARD GROUP INC (13.65Mn), BlackRock, Inc. (12.85Mn), Avoro Capital Advisors LLC (10.91Mn), RA CAPITAL MANAGEMENT, L.P. (8.64Mn), Goldman Sachs Group Inc (7.55Mn), Janus Henderson Group Plc (6.94Mn), BALYASNY ASSET MANAGEMENT L.P. (6.04Mn), Pentwater Capital Management LP (6.03Mn), HBK INVESTMENTS L P (4.36Mn), State Street Corp (4.1Mn).

333 Institutional Holders

150,366,022 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
VANGUARD GROUP INC	31 Dec, 2025	13,649,250	429,491	3.25%	$984,520,403.00
BlackRock, Inc.	31 Dec, 2025	12,850,801	3,648,222	39.64%	$926,928,275.00
Avoro Capital Advisors LLC	31 Dec, 2025	10,910,000	3,265,000	42.71%	$786,938,300.00
RA CAPITAL MANAGEMENT, L.P.	31 Dec, 2025	8,641,031	0	0.00%	$623,277,566.00
Goldman Sachs Group Inc	31 Dec, 2025	7,553,570	5,821,101	336.00%	$544,839,004.00
Janus Henderson Group Plc	31 Dec, 2025	6,939,503	-7,583,412	-52.22%	$500,560,229.00
BALYASNY ASSET MANAGEMENT L.P.	31 Dec, 2025	6,040,590	6,040,590	0.00%	$435,707,757.00
Pentwater Capital Management LP	31 Dec, 2025	6,026,500	6,026,500	0.00%	$434,691,445.00
HBK INVESTMENTS L P	31 Dec, 2025	4,365,000	4,365,000	0.00%	$314,847,450.00
State Street Corp	31 Dec, 2025	4,097,885	-790,747	-16.18%	$295,580,445.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	3,120,780	262,731	9.19%	$225,144,631.00
NORGES BANK	31 Dec, 2025	3,046,388	3,046,388	0.00%	$219,735,966.00
Bellevue Group AG	31 Dec, 2025	2,630,969	478,107	22.21%	$189,771,794.00
ADAGE CAPITAL PARTNERS GP, L.L.C.	31 Dec, 2025	2,630,966	1,430,966	119.25%	$189,771,578.00
GLAZER CAPITAL, LLC	31 Dec, 2025	2,467,139	2,467,139	0.00%	$177,955.00
UBS Group AG	31 Dec, 2025	2,356,812	1,040,953	79.11%	$169,996,849.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	2,157,270	2,127,647	7,182.42%	$155,603,885.00
TIG Advisors, LLC	31 Dec, 2025	1,801,683	1,801,683	0.00%	$129,955,395.00
CITADEL ADVISORS LLC	31 Dec, 2025	1,592,429	692,665	76.98%	$114,861,904.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	1,181,661	57,884	5.15%	$85,233,208.00

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