RNA · Atrium Therapeutics, Inc. · Shareholders & Ownership

$8.25 +0.20 (+2.48%)

Russell 2000 member Rebalance outlook locked

Market Cap

$137.70M

17.11M

Volume · Oct 27 78.46K Avg daily vol (3M) 264.95K

Every disclosed holder of RNA in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns RNA

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	151	14,219,419	83.13%	Yes
Insiders (Forms 3, 4, 5)	11	520,372	3.04%	Yes
13D/G-only blocks	0	0	0.00%	Yes
Remaining	—	2,365,852	13.83%	Rest
Registered funds (N-PORT, not summed)	149	3,393,904	19.84%	No

Shares outstanding: 17,105,643, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of RNA

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	Sessa Capital IM, L.P. 13F CIK 1595849 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,500,000	8.77%	+948,609	Jun 30, 2026	carried, not yet filed for the newest quarter
1.1	Sessa Capital IM, L.P. 13G CIK 1595849 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	1,500,000	8.77%	—	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
2	PRICE T ROWE ASSOCIATES INC /MD/ 13F CIK 80255 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,472,984	8.61%	-80,226	Jun 30, 2026	carried, not yet filed for the newest quarter
2.1	PRICE T ROWE ASSOCIATES INC /MD/ 13G CIK 80255 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	1,472,984	8.61%	-80,226	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
2.2	T. Rowe Price Health Sciences Fund, Inc. Fund S000002088 · Registered fund · Jun 30, 2026 T. ROWE PRICE HEALTH SCIENCES FUND, INC., not summed	566,428	3.31%	-99,897	Jun 30, 2026	T. ROWE PRICE HEALTH SCIENCES FUND, INC., not summed
2.3	T. Rowe Price New Horizons Fund, Inc. Fund S000002106 · Registered fund · Jun 30, 2026 T. ROWE PRICE NEW HORIZONS FUND, INC., not summed	443,263	2.59%	-199	Jun 30, 2026	T. ROWE PRICE NEW HORIZONS FUND, INC., not summed
2.4	T. Rowe Price Health Sciences Portfolio Fund S000002083 · Registered fund · Jun 30, 2026 T. ROWE PRICE EQUITY SERIES, INC., not summed	41,700	0.24%	0	Jun 30, 2026	T. ROWE PRICE EQUITY SERIES, INC., not summed
2.5	T. Rowe Price Extended Equity Market Index Fund Fund S000002090 · Registered fund · Jun 30, 2026 T. ROWE PRICE INDEX TRUST, INC., not summed	2,227	0.01%	0	Jun 30, 2026	T. ROWE PRICE INDEX TRUST, INC., not summed
3	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	1,447,476	8.46%	+242,185	Jun 30, 2026	carried, not yet filed for the newest quarter
3.1	BlackRock, Inc. 13G CIK 2012383 · Holding company · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	1,135,757	6.64%	+243,370	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
3.2	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	377,354	2.21%	+78,816	Jun 30, 2026	iShares Trust, not summed
3.3	iShares Russell 2000 Growth ETF Fund S000004343 · Registered fund · Jun 30, 2026 iShares Trust, not summed	88,107	0.52%	+562	Jun 30, 2026	iShares Trust, not summed
3.4	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	48,184	0.28%	—	Jun 30, 2026	iShares Trust, not summed
3.5	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	41,090	0.24%	+32,879	Jun 30, 2026	iShares Trust, not summed
4	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	730,831	4.27%	+103,962	Jun 30, 2026	carried, not yet filed for the newest quarter
5	CRCM LP 13F CIK 1483234 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	641,539	3.75%	+641,539	Jun 30, 2026	carried, not yet filed for the newest quarter
6	TIG Advisors, LLC 13F CIK 1358253 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	561,533	3.28%	-46,019	Jun 30, 2026	carried, not yet filed for the newest quarter
7	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	518,416	3.03%	+74,500	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
8	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	386,929	2.26%	+67,098	Jun 30, 2026	carried, not yet filed for the newest quarter
9	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	345,481	2.02%	+166,921	Jun 30, 2026	carried, not yet filed for the newest quarter
10	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	310,341	1.81%	-39,609	Jun 30, 2026	carried, not yet filed for the newest quarter
10.1	Goldman Sachs Small Cap Growth Insights Fund Fund S000014930 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	8,636	0.05%	-12,578	Jul 31, 2026	Goldman Sachs Trust, not summed
10.2	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Aug 31, 2026 GOLDMAN SACHS TRUST, not summed	14	0.00%	-10,064	Aug 31, 2026	GOLDMAN SACHS TRUST, not summed
11	683 Capital Management, LLC 13F CIK 1404574 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	300,000	1.75%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
12	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	271,762	1.59%	+14,676	Jun 30, 2026	carried, not yet filed for the newest quarter
12.1	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	3,870	0.02%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
12.2	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	340	0.00%	0	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
12.3	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	70	0.00%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
12.4	State Street(R) SPDR(R) S&P(R) Biotech ETF Fund S000010018 · Registered fund · Jun 30, 2026 SPDR SERIES TRUST, not summed	1	0.00%	—	Jun 30, 2026	SPDR SERIES TRUST, not summed
13	Arbiter Partners Capital Management LLC 13F CIK 1513193 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	261,288	1.53%	+31,288	Jun 30, 2026	carried, not yet filed for the newest quarter
14	CANTOR FITZGERALD, L. P. 13F CIK 1024896 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	256,917	1.50%	+21,280	Jun 30, 2026	carried, not yet filed for the newest quarter
15	Slotnik Capital, LLC 13F CIK 1963764 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	237,637	1.39%	+56,692	Jun 30, 2026	carried, not yet filed for the newest quarter
16	Weiss Asset Management LP 13F CIK 1357550 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	219,730	1.28%	-20,971	Jun 30, 2026	carried, not yet filed for the newest quarter
17	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	200,559	1.17%	+9,700	Jun 30, 2026	carried, not yet filed for the newest quarter
18	Schonfeld Strategic Advisors LLC 13F CIK 1665241 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	199,158	1.16%	+36,399	Jun 30, 2026	carried, not yet filed for the newest quarter
19	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	188,626	1.10%	+29,274	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
20	AQR CAPITAL MANAGEMENT LLC 13F CIK 1167557 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	172,235	1.01%	+172,235	Jun 30, 2026	carried, not yet filed for the newest quarter
20.1	AQR Small Cap Momentum Style Fund Fund S000025644 · Registered fund · Mar 31, 2026 AQR Funds, not summed	1,386	0.01%	—	Mar 31, 2026	AQR Funds, not summed
21	NEXPOINT ASSET MANAGEMENT, L.P. 13F CIK 1469877 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	150,025	0.88%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
21.1	Nexpoint Merger Arbitrage Fund Fund S000054634 · Registered fund · Jun 30, 2026 NexPoint Funds I, not summed	135,138	0.79%	0	Jun 30, 2026	NexPoint Funds I, not summed
21.2	NexPoint Event Driven Fund Fund S000021242 · Registered fund · Jun 30, 2026 NexPoint Funds I, not summed	10,033	0.06%	0	Jun 30, 2026	NexPoint Funds I, not summed
22	Polar Asset Management Partners Inc. 13F CIK 1326389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	150,000	0.88%	+80,000	Jun 30, 2026	carried, not yet filed for the newest quarter
23	Squarepoint Ops LLC 13F CIK 1642575 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	146,743	0.86%	-84,723	Jun 30, 2026	carried, not yet filed for the newest quarter
24	Bracebridge Capital, LLC 13F CIK 1426486 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	139,239	0.81%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
25	Boyce Sarah Insider CIK 1629383 · Sep 18, 2026 Director, issuer-wide	138,668	0.81%	-126,418	Sep 18, 2026	Director, issuer-wide
26	NOMURA HOLDINGS INC 13F CIK 1163653 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	137,394	0.80%	+14	Jun 30, 2026	carried, not yet filed for the newest quarter
27	Yakira Capital Management, Inc. 13F CIK 1584639 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	133,047	0.78%	+6,402	Jun 30, 2026	carried, not yet filed for the newest quarter
28	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	132,833	0.78%	-3,415	Jun 30, 2026	carried, not yet filed for the newest quarter
29	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	130,217	0.76%	+13,619	Jun 30, 2026	carried, not yet filed for the newest quarter
29.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · Aug 31, 2026 SCHWAB STRATEGIC TRUST, not summed	75,864	0.44%	+8,225	Aug 31, 2026	SCHWAB STRATEGIC TRUST, not summed
29.2	Schwab Small-Cap Index Fund Fund S000005912 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	35,118	0.21%	+8,554	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
29.3	Schwab U.S. Broad Market ETF Fund S000026631 · Registered fund · Aug 31, 2026 SCHWAB STRATEGIC TRUST, not summed	8,226	0.05%	0	Aug 31, 2026	SCHWAB STRATEGIC TRUST, not summed
29.4	Schwab Total Stock Market Index Fund Fund S000005913 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	7,037	0.04%	0	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
29.5	Schwab 1000 Index Fund Fund S000006807 · Registered fund · Jul 31, 2026 SCHWAB INVESTMENTS, not summed	4,540	0.03%	0	Jul 31, 2026	SCHWAB INVESTMENTS, not summed
30	TUDOR INVESTMENT CORP ET AL 13F CIK 923093 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	129,591	0.76%	+58,232	Jun 30, 2026	carried, not yet filed for the newest quarter
31	DAFNA Capital Management LLC 13F CIK 1389933 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	128,000	0.75%	+128,000	Jun 30, 2026	carried, not yet filed for the newest quarter
32	Creek Drive Management Group LLC 13F CIK 2111824 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	127,600	0.75%	+7,600	Jun 30, 2026	carried, not yet filed for the newest quarter
33	NORGES BANK 13F CIK 1374170 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	126,575	0.74%	—	Jun 30, 2026	carried, not yet filed for the newest quarter
34	Anson Funds Management LP 13F CIK 1491072 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	125,000	0.73%	+125,000	Jun 30, 2026	carried, not yet filed for the newest quarter
35	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	119,781	0.70%	+21,196	Jun 30, 2026	carried, not yet filed for the newest quarter
35.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	7,436	0.04%	+800	Jun 30, 2026	Northern Funds, not summed
36	Gallagher Kathleen P. Insider CIK 2048409 · Sep 18, 2026 Director, See Remarks, issuer-wide	119,729	0.70%	-11,632	Sep 18, 2026	Director, See Remarks, issuer-wide
37	ExodusPoint Capital Management, LP 13F CIK 1736225 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	117,275	0.69%	+39,833	Jun 30, 2026	carried, not yet filed for the newest quarter
38	TD Asset Management Inc 13F CIK 1056053 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	111,200	0.65%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
39	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	109,961	0.64%	+14,833	Jun 30, 2026	carried, not yet filed for the newest quarter
40	JANE STREET GROUP, LLC 13F CIK 1595888 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	109,810	0.64%	+89,855	Jun 30, 2026	carried, not yet filed for the newest quarter
41	Athos Capital Ltd 13F CIK 1681662 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	107,965	0.63%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
42	AWM Investment Company, Inc. 13F CIK 1535264 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	107,500	0.63%	+57,500	Jun 30, 2026	carried, not yet filed for the newest quarter
43	Balyasny Asset Management L.P. 13F CIK 1218710 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	105,875	0.62%	-129,240	Jun 30, 2026	carried, not yet filed for the newest quarter
44	Marble Bar Asset Management LLP 13F CIK 1346570 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	103,849	0.61%	-43,151	Jun 30, 2026	carried, not yet filed for the newest quarter
45	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	101,195	0.59%	-243,174	Jun 30, 2026	carried, not yet filed for the newest quarter
46	ADAGE CAPITAL PARTNERS GP, L.L.C. 13F CIK 1165408 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	100,000	0.58%	-83,580	Jun 30, 2026	carried, not yet filed for the newest quarter
47	BlueCrest Capital Management Ltd 13F CIK 1610880 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	100,000	0.58%	+100,000	Jun 30, 2026	carried, not yet filed for the newest quarter
48	CREDIT INDUSTRIEL ET COMMERCIAL 13F CIK 1274419 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	89,723	0.52%	+66,723	Jun 30, 2026	carried, not yet filed for the newest quarter
49	Groupe la Francaise 13F CIK 2056088 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	80,273	0.47%	+50,575	Jun 30, 2026	carried, not yet filed for the newest quarter
50	FIL Ltd 13F CIK 318989 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	76,500	0.45%	-2,000	Jun 30, 2026	carried, not yet filed for the newest quarter

13 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 244 holders

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Key facts CIK 2093101 CUSIP 04965N104 13F (30d) 13 filings 13 filers Visit website Investor relations