RNA · Atrium Therapeutics, Inc. · Holdings

$10.36 +0.01 (+0.10%) At close · Sep 11

Russell 2000 member Rebalance outlook locked

Market Cap

$177.04M

17.11M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP →

Quarter:

Holders: 156

Total Value: $205,220,872

Total Shares: 15,258,065

Showing 1–100 of 160 holdings by value · page 1 of 2

Institutional Ownership Trend

2 quarters

Holder Concentration

Across 156 13F filers · Δ vs Mar 31, 2026

Top Holder

9.8%

+0.1 pts

Top 5

39.3%

+6.4 pts

Top 10

54.0%

+4.3 pts

HHI

423

Broadly held+74

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: -9

Institutional value: -4.3%

Shares held: -4.9%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mid Sessa Capital IM, L.P.	+948,609	1,500,000
Mega BlackRock, Inc.	+242,185	1,447,476
Mega TWO SIGMA INVESTMENTS, LP	+166,921	345,481
Mega VANGUARD CAPITAL MANAGEMENT LLC	+103,962	730,831
Mega JANE STREET GROUP, LLC	+89,855	109,810

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mega VANGUARD PORTFOLIO MANAGEMENT LLC	−243,174	101,195
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	−189,543	840,600
Large Balyasny Asset Management L.P.	−129,240	105,875
Mega MORGAN STANLEY	−123,094	41,942
Large Squarepoint Ops LLC	−84,723	146,743

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Small CRCM LP	641,539	$8,628,699
Mega AQR CAPITAL MANAGEMENT LLC	172,235	$2,316,558
Small DAFNA Capital Management LLC	128,000	$1,721,600
Mega NORGES BANK	126,575	$1,702,433
Mid Anson Funds Management LP	125,000	$1,681,250

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Large RA CAPITAL MANAGEMENT, L.P.	864,102	$11,553,043
Large Pentwater Capital Management LP	602,649	$8,057,417
Small O'Connor Alternative Investments LLC	578,011	$7,728,007
Large FARALLON CAPITAL MANAGEMENT LLC	349,360	$4,670,943
Mid Bellevue Group AG	263,096	$3,517,593

Filter: New 38 Increased 47 Reduced 38 Sold out 47 Unchanged 33

Showing 100 of 160

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

Sessa Capital IM, L.P.

$20,175,000

9.83%

1,500,000

PRICE T ROWE ASSOCIATES INC /MD/

$19,811,634

9.65%

1,472,984

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
T. Rowe Price International Ltd	47,165	$634,369	3.2%	Defined
Held directly	1,425,819	$19,177,265	96.8%	Sole

BlackRock, Inc.

$19,468,547

9.49%

1,447,476

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	36,740	$494,153	2.5%	Sole
BlackRock Asset Management Canada Ltd	70	$941	0.0%	Sole
BlackRock Investment Management, LLC	49,033	$659,493	3.4%	Sole
BLACKROCK ADVISORS LLC	237,985	$3,200,898	16.4%	Sole
BlackRock Fund Advisors	580,257	$7,804,456	40.1%	Sole
BlackRock Institutional Trust Company, N.A.	492,955	$6,630,244	34.1%	Sole
BlackRock Japan Co. Ltd	299	$4,021	0.0%	Sole
BlackRock (Luxembourg) S.A.	49,684	$668,249	3.4%	Sole
Aperio Group, LLC	453	$6,092	0.0%	Sole

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$11,306,070

5.51%

840,600

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	840,600	$11,306,070	100.0%	Other

VANGUARD CAPITAL MANAGEMENT LLC

$9,829,676

4.79%

730,831

CRCM LP

$8,628,699

4.20%

641,539

TIG Advisors, LLC

$7,552,618

3.68%

561,533

GEODE CAPITAL MANAGEMENT, LLC

$5,204,194

2.54%

386,929

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	61,004	$820,503	15.8%	Defined
Held directly	325,925	$4,383,691	84.2%	Defined

TWO SIGMA INVESTMENTS, LP

$4,646,719

2.26%

345,481

GOLDMAN SACHS GROUP INC

$4,174,086

2.03%

310,341

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	253,469	$3,409,158	81.7%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	56,872	$764,928	18.3%	Defined

683 Capital Management, LLC

$4,035,000

1.97%

300,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
683 Capital Partners, LP	300,000	$4,035,000	100.0%	Defined

STATE STREET CORP

$3,655,198

1.78%

271,762

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS EUROPE LIMITED joint	271,762	$3,655,198	100.0%	Defined

Arbiter Partners Capital Management LLC

$3,514,323

1.71%

261,288

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Broken Clock Management LLC joint	261,288	$3,514,323	100.0%	Defined

CANTOR FITZGERALD, L. P.

$3,455,533

1.68%

256,917

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Cantor Fitzgerald & Co.	256,917	$3,455,533	100.0%	Defined

Slotnik Capital, LLC

$3,196,217

1.56%

237,637

Weiss Asset Management LP

$2,955,368

1.44%

219,730

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WEISS ANDREW M joint	219,730	$2,955,368	100.0%	Defined

MILLENNIUM MANAGEMENT LLC

$2,697,518

1.31%

200,559

Schonfeld Strategic Advisors LLC

$2,678,675

1.31%

199,158

AQR CAPITAL MANAGEMENT LLC

$2,316,558

1.13%

172,235

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RF&L WEALTH MANAGEMENT, LLC	18	$242	0.0%	Other
Compound Planning, Inc.	21	$282	0.0%	Other
Arax Advisory Partners	2,850	$38,332	1.7%	Other
HALBERT HARGROVE GLOBAL ADVISORS, LLC	872	$11,728	0.5%	Other
Stokes Family Office, LLC	457	$6,146	0.3%	Other
Held directly	168,017	$2,259,828	97.6%	Defined

NEXPOINT ASSET MANAGEMENT, L.P.

$2,017,835

0.98%

150,025

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NexPoint Advisors, L.P.	4,854	$65,286	3.2%	Other
Held directly	145,171	$1,952,549	96.8%	Sole

Polar Asset Management Partners Inc.

$2,017,500

0.98%

150,000

Squarepoint Ops LLC

$1,973,693

0.96%

146,743

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	146,743	$1,973,693	100.0%	Defined

Bracebridge Capital, LLC

$1,872,764

0.91%

139,239

NOMURA HOLDINGS INC

$1,847,949

0.90%

137,394

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NOMURA GLOBAL FINANCIAL PRODUCTS INC	137,394	$1,847,949	100.0%	Defined

Yakira Capital Management, Inc.

$1,789,482

0.87%

133,047

BANK OF AMERICA CORP /DE/

$1,786,603

0.87%

132,833

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	16,383	$220,351	12.3%	Defined
BOFA SECURITIES, INC.	116,450	$1,566,252	87.7%	Defined

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$1,751,418

0.85%

130,217

TUDOR INVESTMENT CORP ET AL

$1,742,998

0.85%

129,591

DAFNA Capital Management LLC

$1,721,600

0.84%

128,000

Creek Drive Management Group LLC

$1,716,220

0.84%

127,600

NORGES BANK

$1,702,433

0.83%

126,575

Anson Funds Management LP

$1,681,250

0.82%

125,000

NORTHERN TRUST CORP

$1,611,053

0.79%

119,781

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	117,536	$1,580,858	98.1%	Defined
DWS INVESTMENT MANAGEMENT AMERICAS, INC joint	2,245	$30,195	1.9%	Other

ExodusPoint Capital Management, LP

$1,577,348

0.77%

117,275

Trium Capital LLP

$1,523,589

0.74%

113,278

TD Asset Management Inc

$1,495,640

0.73%

111,200

VANGUARD FIDUCIARY TRUST CO

$1,478,975

0.72%

109,961

JANE STREET GROUP, LLC

$1,476,943

0.72%

109,810

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	73,728	$991,641	67.1%	Defined
Jane Street Global Trading, LLC	36,082	$485,302	32.9%	Defined

Athos Capital Ltd

$1,452,129

0.71%

107,965

AWM Investment Company, Inc.

$1,445,875

0.70%

107,500

Balyasny Asset Management L.P.

$1,424,018

0.69%

105,875

Marble Bar Asset Management LLP

$1,396,769

0.68%

103,849

VANGUARD PORTFOLIO MANAGEMENT LLC

$1,361,072

0.66%

101,195

BlueCrest Capital Management Ltd

$1,345,000

0.66%

100,000

ADAGE CAPITAL PARTNERS GP, L.L.C.

$1,345,000

0.66%

100,000

CREDIT INDUSTRIEL ET COMMERCIAL

$1,206,774

0.59%

89,723

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Caisse Federale de Credit Mutuel	89,723	$1,206,774	100.0%	Defined

Groupe la Francaise

$1,079,671

0.53%

80,273

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Caisse Federale de Credit Mutuel joint	80,273	$1,079,671	100.0%	Defined

FIL Ltd

$1,028,925

0.50%

76,500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Investments Canada ULC	76,500	$1,028,925	100.0%	Defined

Caption Management, LLC

$1,012,475

0.49%

75,277

CITADEL ADVISORS LLC

$909,744

0.44%

67,639

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	11,719	$157,620	17.3%	Defined
Held directly	55,920	$752,124	82.7%	Defined

MANUFACTURERS LIFE INSURANCE COMPANY, THE

$845,372

0.41%

62,853

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MANULIFE FINANCIAL CORP joint	62,853	$845,372	100.0%	Defined

Caption Management, LLC

$817,760

0.40%

60,800

ADAR1 Capital Management, LLC

$775,903

0.38%

57,688

FRANKLIN RESOURCES INC

$762,600

0.37%

56,699

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
FRANKLIN ADVISERS INC	54,257	$729,756	95.7%	Defined
PUTNAM ADVISORY CO LLC	2,442	$32,844	4.3%	Defined

JACOBS LEVY EQUITY MANAGEMENT, INC

$726,192

0.35%

53,992

ODDO BHF ASSET MANAGEMENT SAS

$606,460

0.30%

45,090

CAXTON ASSOCIATES LLP

$594,893

0.29%

44,230

ALETHEA CAPITAL MANAGEMENT, LLC

$588,545

0.29%

43,758

CANADA PENSION PLAN INVESTMENT BOARD

$564,496

0.28%

41,970

MORGAN STANLEY

$564,117

0.27%

41,942

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	59	$793	0.1%	Defined
MORGAN STANLEY & CO. LLC	4,869	$65,488	11.6%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	28,085	$377,743	67.0%	Defined
MORGAN STANLEY INVESTMENT MANAGEMENT INC	55	$739	0.1%	Defined
MORGAN STANLEY SMITH BARNEY LLC	555	$7,464	1.3%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	8,319	$111,890	19.8%	Defined

Saba Capital Management, L.P.

$533,158

0.26%

39,640

Bank of New York Mellon Corp

$527,937

0.26%

39,252

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BNY Mellon Trust of Delaware joint	360	$4,842	0.9%	Defined
Mellon Investments Corporation	11,781	$158,454	30.0%	Defined
The Bank of New York Mellon	25,162	$338,428	64.1%	Defined
BNY Mellon, NA joint	1,948	$26,200	5.0%	Defined
Held directly	1	$13	0.0%	Defined

Y-Intercept (Hong Kong) Ltd

$472,135

0.23%

35,103

KENNEDY CAPITAL MANAGEMENT LLC

$470,467

0.23%

34,979

FMR LLC

$451,004

0.22%

33,532

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	18,531	$249,241	55.3%	Defined
STRATEGIC ADVISERS LLC	1	$13	0.0%	Defined
Fidelity Diversifying Solutions LLC	15,000	$201,750	44.7%	Defined

Moran Wealth Management, LLC

$448,154

0.22%

33,320

BOUSSARD & GAVAUDAN GESTION SAS

$441,765

0.22%

32,845

LMR Partners LLP

$437,125

0.21%

32,500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
LMR Partners LLC	32,500	$437,125	100.0%	Sole

LOS ANGELES CAPITAL MANAGEMENT LLC

$423,365

0.21%

31,477

Nuveen, LLC

$417,904

0.20%

31,071

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Nuveen Asset Management, LLC joint	1,254	$16,866	4.0%	Defined
TEACHERS ADVISORS, LLC joint	29,817	$401,038	96.0%	Defined

Jump Financial, LLC

$417,178

0.20%

31,017

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Leap GP LLC joint	31,017	$417,178	100.0%	Defined

Quantinno Capital Management LP

$368,772

0.18%

27,418

Twin Securities, Inc.

$356,653

0.17%

26,517

Odyssean, LLC

$285,583

0.14%

21,233

Walleye Trading LLC

$281,105

0.14%

20,900

Brevan Howard Capital Management LP

$280,217

0.14%

20,834

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Brevan Howard US Investment Management, LP	20,834	$280,217	100.0%	Defined

Fractal Investments LLC

$269,000

0.13%

20,000

UBS Group AG

$263,243

0.13%

19,572

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Financial Services Inc	5	$67	0.0%	Defined
UBS AG	19,567	$263,176	100.0%	Defined

HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND

$250,035

0.12%

18,590

Vestcor Inc

$235,361

0.11%

17,499

WELLS FARGO & COMPANY/MN

$234,714

0.11%

17,451

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO BANK N A	12,746	$171,433	73.0%	Defined
WELLS FARGO ADVISORS FINANCIAL NETWORK, LLC	304	$4,088	1.7%	Defined
WELLS FARGO CLEARING SERVICES, LLC	4,401	$59,193	25.2%	Defined

ALLIANCEBERNSTEIN L.P.

$230,129

0.11%

17,110

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Equitable Holdings, Inc.	17,110	$230,129	100.0%	Defined

RHUMBLINE ADVISERS

$222,987

0.11%

16,579

BLUEFIN CAPITAL MANAGEMENT, LLC

$215,347

0.10%

16,011

RENAISSANCE TECHNOLOGIES LLC

$201,359

0.10%

14,971

DEUTSCHE BANK AG\

$201,305

0.10%

14,967

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
DWS INVESTMENT MANAGEMENT AMERICAS, INC	191	$2,568	1.3%	Defined
DWS Investments UK Ltd	14,776	$198,737	98.7%	Defined

Invesco Ltd.

$190,638

0.09%

14,174

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Invesco Advisers, Inc. joint	1,972	$26,522	13.9%	Defined
Invesco Trust Co joint	4,812	$64,721	33.9%	Defined
Invesco Capital Management LLC	7,390	$99,395	52.1%	Defined

Jupiter Topco LLC

$186,053

0.09%

13,833

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JANUS HENDERSON INVESTORS UK Ltd	13,833	$186,053	100.0%	Defined

AlphaCentric Advisors LLC

$181,279

0.09%

13,478

AXQ CAPITAL, LP

$153,020

0.07%

11,377

KESTRA PRIVATE WEALTH SERVICES, LLC

$139,476

0.07%

10,370

MetLife Investment Management, LLC

$138,306

0.07%

10,283

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
METLIFE INC	10,283	$138,306	100.0%	Defined

Corsicana & Co.

$132,079

0.06%

9,820

JPMORGAN CHASE & CO

$126,267

0.06%

9,388

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JPMorgan Chase Bank, N.A.	6,072	$81,668	64.7%	Defined
J.P. Morgan Investment Management Inc.	2,902	$39,031	30.9%	Defined
J.P. Morgan Markets Ltd	414	$5,568	4.4%	Defined

BNP PARIBAS ARBITRAGE, SA

$106,268

0.05%

7,901

CITIGROUP INC

$89,913

0.04%

6,685

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	6,685	$89,913	100.0%	Defined

MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.

$88,796

0.04%

6,602

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Global X Management CO LLC joint	6,602	$88,796	100.0%	Defined

Vanguard Global Advisers, LLC

$75,118

0.04%

5,585

Walleye Trading LLC

$67,250

0.03%

5,000

Russell Investments Group, Ltd.

$60,185

0.03%

4,475

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Russell Investment Management, LLC	3,919	$52,709	87.6%	Defined
Russell Investments Capital, LLC	204	$2,743	4.6%	Defined
Russell Investments France SAS	141	$1,896	3.2%	Defined
Russell Investments Trust Company	211	$2,837	4.7%	Defined

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