STIM · Neuronetics, Inc. · Holdings

$2.25 -0.09 (-3.85%)

Market Cap

$208.78M

76.20M

Volume · Oct 1 938.16K Avg daily vol (3M) 2.08M

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 →

Institutional holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.

Quarter:

Holders: 86

Total Value: $48,514,079

Total Shares: 37,318,561

Institutional Ownership Trend

26 quarters

Superinvestors Holding STIM

All superinvestors →

Mario Gabelli $102,960

Holder Concentration

Across 86 13F filers · Δ vs Mar 31, 2026

Top Holder

49.7%

+5.4 pts

Top 5

70.2%

+2.0 pts

Top 10

82.4%

−0.3 pts

HHI

2,622

Highly concentrated+456

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: -13

Institutional value: -19.8%

Shares held: -10.6%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Small WEXFORD CAPITAL LP	+1,301,664	2,002,625
Mega CITADEL ADVISORS LLC	+342,706	434,703
Small FourWorld Capital Management LLC	+254,820	1,744,142
Mega JANE STREET GROUP, LLC	+168,676	199,450
Mega BNP PARIBAS ARBITRAGE, SA	+140,520	148,815

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mega BlackRock, Inc.	−1,721,915	596,622
Mega UBS Group AG	−591,499	2,279,099
Mega STATE STREET CORP	−552,248	290,299
Mega VANGUARD CAPITAL MANAGEMENT LLC	−540,878	1,507,097
Mega GEODE CAPITAL MANAGEMENT, LLC	−500,515	458,474

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Mega MARSHALL WACE, LLP	485,692	$631,399
Mega MILLENNIUM MANAGEMENT LLC	199,450	$259,285
Large TUDOR INVESTMENT CORP ET AL	124,861	$162,319
Mid Engineers Gate Manager LP	57,175	$74,327
Small Caitong International Asset Management Co., Ltd	41,320	$53,716

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Large Balyasny Asset Management L.P.	2,743,768	$3,978,463
Mega VANGUARD PORTFOLIO MANAGEMENT LLC	221,170	$320,696
Mid Massar Capital Management, LP	221,000	$320,450
Mega Nuveen, LLC	123,089	$178,478
Mid CITIZENS FINANCIAL GROUP INC/RI	110,953	$160,881

Filter: New 16 Increased 29 Reduced 25 Sold out 29 Unchanged 16

Showing 90 of 90

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

Madryn Asset Management, LP

$24,102,634

49.68%

18,540,488

UBS Group AG

$2,962,828

6.11%

2,279,099

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

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	2,278,345	$2,961,848	100.0%	Defined
UBS Securities LLC	754	$980	0.0%	Defined

WEXFORD CAPITAL LP

$2,603,412

5.37%

2,002,625

FourWorld Capital Management LLC

$2,267,384

4.67%

1,744,142

Lane Generational LLC

$2,123,383

4.38%

1,633,372

VANGUARD CAPITAL MANAGEMENT LLC

$1,959,226

4.04%

1,507,097

MASTERS CAPITAL MANAGEMENT LLC

$1,300,000

2.68%

1,000,000

AdvisorShares Investments LLC

$965,633

1.99%

742,795

Ikarian Capital, LLC

$911,536

1.88%

701,182

BlackRock, Inc.

$775,607

1.60%

596,622

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	47,691	$61,998	8.0%	Sole
BlackRock Investment Management, LLC	6,789	$8,825	1.1%	Sole
BlackRock Fund Advisors	93,494	$121,542	15.7%	Sole
BlackRock Institutional Trust Company, N.A.	448,648	$583,242	75.2%	Sole

HighTower Advisors, LLC

$732,863

1.51%

563,741

MARSHALL WACE, LLP

$631,399

1.30%

485,692

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

Manager	Shares	Value (USD)	% of position	Discretion
Marshall Wace North America L.P. joint	485,692	$631,399	100.0%	Other

GEODE CAPITAL MANAGEMENT, LLC

$596,015

1.23%

458,474

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	84,983	$110,477	18.5%	Defined
Held directly	373,491	$485,538	81.5%	Defined

CITADEL ADVISORS LLC

$548,473

1.13%

421,903

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	421,903	$548,473	100.0%	Defined

Dauntless Investment Group, LLC

$479,943

0.99%

369,187

STATE STREET CORP

$377,388

0.78%

290,299

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

Manager	Shares	Value (USD)	% of position	Discretion
SSGA FUNDS MANAGEMENT, INC. joint	290,299	$377,388	100.0%	Defined

Centiva Capital, LP

$371,686

0.77%

285,913

VANGUARD FIDUCIARY TRUST CO

$344,154

0.71%

264,734

GOLDMAN SACHS GROUP INC

$343,314

0.71%

264,088

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	132,004	$171,605	50.0%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	132,084	$171,709	50.0%	Defined

JBF Capital, Inc.

$303,115

0.62%

233,166

XTX Topco Ltd

$286,419

0.59%

220,323

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

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	220,323	$286,419	100.0%	Defined

MILLENNIUM MANAGEMENT LLC

$259,285

0.53%

199,450

BOOTHBAY FUND MANAGEMENT, LLC

$246,041

0.51%

189,263

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$241,478

0.50%

185,753

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

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	185,753	$241,478	100.0%	Other

JANE STREET GROUP, LLC

$240,824

0.50%

185,250

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	118,413	$153,936	63.9%	Defined
Jane Street Global Trading, LLC	66,837	$86,888	36.1%	Defined

BNP PARIBAS ARBITRAGE, SA

$193,459

0.40%

148,815

TUDOR INVESTMENT CORP ET AL

$162,319

0.33%

124,861

AQR CAPITAL MANAGEMENT LLC

$153,166

0.32%

117,822

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	1	$1	0.0%	Other
Prism Planning Partners LLC	229	$297	0.2%	Other
Arax Advisory Partners	430	$559	0.4%	Other
HALBERT HARGROVE GLOBAL ADVISORS, LLC	98	$127	0.1%	Other
Stokes Family Office, LLC	458	$595	0.4%	Other
Held directly	116,606	$151,587	99.0%	Defined

ADAR1 Capital Management, LLC

$130,000

0.27%

100,000

BRIDGEWAY CAPITAL MANAGEMENT, LLC

$123,766

0.26%

95,205

Squarepoint Ops LLC

$123,000

0.25%

94,616

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

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	94,616	$123,000	100.0%	Defined

NORTHERN TRUST CORP

$115,878

0.24%

89,138

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	89,138	$115,878	100.0%	Defined

HRT FINANCIAL LP

$115,323

0.24%

88,710

GAMCO INVESTORS, INC. ET AL

$102,960

0.21%

79,200

Invesco Ltd.

$88,842

0.18%

68,340

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

Manager	Shares	Value (USD)	% of position	Discretion
Invesco Capital Management LLC	68,340	$88,842	100.0%	Defined

BANK OF AMERICA CORP /DE/

$88,653

0.18%

68,195

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	68,195	$88,653	100.0%	Defined

MORGAN STANLEY

$81,759

0.17%

62,893

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	7,979	$10,372	12.7%	Defined
MORGAN STANLEY & CO. LLC	1,305	$1,696	2.1%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	47,200	$61,360	75.0%	Defined
MORGAN STANLEY SMITH BARNEY LLC	5,290	$6,877	8.4%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	1,119	$1,454	1.8%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$81,380

0.17%

62,600

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

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	62,600	$81,380	100.0%	Other

Engineers Gate Manager LP

$74,327

0.15%

57,175

VestGen Advisors, LLC

$65,362

0.13%

50,279

Cruiser Capital Advisors, LLC

$63,570

0.13%

48,900

Caitong International Asset Management Co., Ltd

$53,716

0.11%

41,320

Arax Advisory Partners

$51,795

0.11%

39,843

GABELLI FUNDS LLC

$49,400

0.10%

38,000

HSBC HOLDINGS PLC

$49,201

0.10%

37,847

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

Manager	Shares	Value (USD)	% of position	Discretion
HSBC BANK PLC	37,847	$49,201	100.0%	Defined

Quadrature Capital Ltd

$40,112

0.08%

30,856

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

Manager	Shares	Value (USD)	% of position	Discretion
Quadrature US Inc.	30,856	$40,112	100.0%	Other

Virtu Financial LLC

$38,456

0.08%

29,582

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

Manager	Shares	Value (USD)	% of position	Discretion
Virtu Americas LLC	29,582	$38,456	100.0%	Defined

David J Yvars Group

$35,815

0.07%

27,550

PRICE T ROWE ASSOCIATES INC /MD/

$31,519

0.06%

24,246

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	24,246	$31,519	100.0%	Defined

State of Wyoming

$30,526

0.06%

23,482

Qube Research & Technologies Ltd

$30,174

0.06%

23,211

Fielder Capital Group LLC

$29,773

0.06%

22,903

Composition Wealth, LLC

$25,806

0.05%

19,851

Tower Research Capital LLC (TRC)

$25,482

0.05%

19,602

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

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	19,602	$25,482	100.0%	Defined

GROUP ONE TRADING LLC

$22,969

0.05%

17,669

Vanguard Global Advisers, LLC

$21,388

0.04%

16,453

Aigen Investment Management, LP

$21,119

0.04%

16,246

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$20,280

0.04%

15,600

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

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	15,600	$20,280	100.0%	Other

SIMPLEX TRADING, LLC

$19,319

0.04%

14,861

IMC-Chicago, LLC

$18,935

0.04%

14,566

Pathstone Holdings, LLC

$18,521

0.04%

14,247

JANE STREET GROUP, LLC

$18,460

0.04%

14,200

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	14,200	$18,460	100.0%	Defined

BANK OF MONTREAL /CAN/

$18,341

0.04%

14,109

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

Manager	Shares	Value (USD)	% of position	Discretion
BMO NESBITT BURNS INC.	14,109	$18,341	100.0%	Defined

CITADEL ADVISORS LLC

$16,640

0.03%

12,800

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	12,800	$16,640	100.0%	Defined

StoneX Group Inc.

$15,719

0.03%

12,092

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

Manager	Shares	Value (USD)	% of position	Discretion
STONEX FINANCIAL INC.	12,092	$15,719	100.0%	Defined

ROYAL BANK OF CANADA

$14,504

0.03%

11,158

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

Manager	Shares	Value (USD)	% of position	Discretion
RBC CMA LTD.	5	$6	0.0%	Defined
RBC Capital Markets, LLC	9,614	$12,498	86.2%	Defined
RBC Dominion Securities Inc.	1,501	$1,951	13.5%	Defined
Held directly	38	$49	0.3%	Sole

AXQ CAPITAL, LP

$14,331

0.03%

11,024

Russell Investments Group, Ltd.

$11,490

0.02%

8,839

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	8,839	$11,490	100.0%	Defined

BARCLAYS PLC

$7,590

0.02%

5,839

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

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS CAPITAL INC.	5,839	$7,590	100.0%	Defined

FMR LLC

$6,578

0.01%

5,061

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	3,476	$4,518	68.7%	Defined
STRATEGIC ADVISERS LLC	1,585	$2,060	31.3%	Defined

MCF Advisors LLC

$4,633

0.01%

3,564

CITIGROUP INC

$3,404

0.01%

2,619

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	2,619	$3,404	100.0%	Defined

Rockefeller Capital Management L.P.

$1,950

0.00%

1,500

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

Manager	Shares	Value (USD)	% of position	Discretion
ROCKEFELLER FINANCIAL LLC	1,500	$1,950	100.0%	Defined

Essential Partners LLC

$1,085

0.00%

835

OSAIC HOLDINGS, INC.

$1,033

0.00%

795

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

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	795	$1,033	100.0%	Defined

Physician Wealth Advisors, Inc.

$1,007

0.00%

775

JPMORGAN CHASE & CO

$972

0.00%

748

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

Manager	Shares	Value (USD)	% of position	Discretion
J.P. Morgan Securities plc	748	$972	100.0%	Defined

GAMMA Investing LLC

$885

0.00%

681

EverSource Wealth Advisors, LLC

$786

0.00%

606

Allied Private Wealth LLC

$611

0.00%

470

SBI Securities Co., Ltd.

$595

0.00%

458

Farther Finance Advisors, LLC

$293

0.00%

226

Allworth Financial LP

$219

0.00%

169

WELLS FARGO & COMPANY/MN

$195

0.00%

150

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

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO CLEARING SERVICES, LLC	150	$195	100.0%	Defined

PNC FINANCIAL SERVICES GROUP, INC.

$161

0.00%

124

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

Manager	Shares	Value (USD)	% of position	Discretion
PNC Bank, National Association	124	$161	100.0%	Defined

Transamerica Financial Advisors, LLC

$154

0.00%

119

Federation des caisses Desjardins du Quebec

$135

0.00%

104

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

Manager	Shares	Value (USD)	% of position	Discretion
Desjardins Securities inc.	20	$26	19.3%	Defined
Held directly	84	$109	80.7%	Defined

ROTHSCHILD INVESTMENT LLC

$107

0.00%

TD Waterhouse Canada Inc.

$76

0.00%

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

Manager	Shares	Value (USD)	% of position	Discretion
TORONTO DOMINION BANK	59	$76	100.0%	Defined

IFP Advisors, Inc

$15

0.00%

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