ATEX · Anterix Inc. · Holdings

$84.33 +1.85 (+2.24%) At close · Oct 2

Russell 2000 member Rebalance outlook locked

Market Cap

$1.54B

19.61M

Volume · Oct 2 241.8K Avg daily vol (3M) 334.51K

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 →

Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.

The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.

Quarter:

Holders: 173

Total Value: $2,024,980,896

Total Shares: 19,671,565

Showing 1–100 of 188 holdings by value · page 1 of 2

Institutional Ownership Trend

27 quarters

Superinvestors Holding ATEX

All superinvestors →

Mario Gabelli $42,773,628 Joel Greenblatt $912,768

Holder Concentration

Across 173 13F filers

Top Holder

27.5%

of institutional value

Top 5

57.5%

of institutional value

Top 10

70.9%

of institutional value

HHI

1,085

Broadly held

Showing 100 of 188

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

Owl Creek Asset Management, L.P.

$557,088,221

27.51%

5,411,776

T. Rowe Price Investment Management, Inc.

$241,705,075

11.94%

2,348,019

Heard Capital LLC

$176,721,009

8.73%

1,716,738

BlackRock, Inc.

$110,672,332

5.47%

1,075,115

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	5,934	$610,845	0.6%	Sole
BlackRock Asset Management Canada Ltd	24	$2,470	0.0%	Sole
BlackRock Investment Management, LLC	35,004	$3,603,311	3.3%	Sole
BLACKROCK ADVISORS LLC	25,607	$2,635,984	2.4%	Sole
BlackRock Fund Advisors	474,755	$48,871,279	44.2%	Sole
BlackRock Institutional Trust Company, N.A.	458,863	$47,235,357	42.7%	Sole
BlackRock (Netherlands) B.V.	843	$86,778	0.1%	Sole
Aperio Group, LLC	73,917	$7,609,015	6.9%	Sole
SpiderRock Advisors, LLC	168	$17,293	0.0%	Sole

PRICE T ROWE ASSOCIATES INC /MD/

$77,251,425

3.81%

750,451

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	19,861	$2,044,491	2.6%	Defined
Held directly	730,590	$75,206,934	97.4%	Sole

Jupiter Topco LLC

$68,188,999

3.37%

662,415

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	264	$27,176	0.0%	Defined
JANUS HENDERSON INVESTORS US LLC	662,151	$68,161,823	100.0%	Defined

VANGUARD CAPITAL MANAGEMENT LLC

$56,926,025

2.81%

553,002

PLUSTICK MANAGEMENT LLC

$53,528,800

2.64%

520,000

STATE STREET CORP

$51,053,093

2.52%

495,950

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	495,950	$51,053,093	100.0%	Defined

GAMCO INVESTORS, INC. ET AL

$42,773,628

2.11%

415,520

GEODE CAPITAL MANAGEMENT, LLC

$39,948,542

1.97%

388,076

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	58,474	$6,019,313	15.1%	Defined
Held directly	329,602	$33,929,229	84.9%	Defined

QVT Financial LP

$39,522,886

1.95%

383,941

DIMENSIONAL FUND ADVISORS LP

$38,187,032

1.89%

370,964

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

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Fund Advisors Ltd.	1,434	$147,615	0.4%	Defined
DFA Australia Ltd.	4,475	$460,656	1.2%	Defined
Dimensional Ireland Ltd	14,705	$1,513,732	4.0%	Defined
Held directly	350,350	$36,065,029	94.4%	Sole

FMR LLC

$38,128,974

1.88%

370,400

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	363,124	$37,379,984	98.0%	Defined
STRATEGIC ADVISERS LLC	628	$64,646	0.2%	Defined
Fidelity Institutional Asset Management Trust Co	3,495	$359,775	0.9%	Defined
FIAM LLC	3,153	$324,569	0.9%	Defined

GABELLI FUNDS LLC

$28,668,790

1.42%

278,500

Invesco Ltd.

$20,688,364

1.02%

200,975

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	1,735	$178,600	0.9%	Defined
Invesco Trust Co joint	4,570	$470,435	2.3%	Defined
Invesco Capital Management LLC	194,670	$20,039,329	96.9%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$20,526,236

1.01%

199,400

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

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	199,400	$20,526,236	100.0%	Other

VANGUARD PORTFOLIO MANAGEMENT LLC

$16,312,798

0.81%

158,469

GARNET EQUITY CAPITAL HOLDINGS, INC.

$16,070,889

0.79%

156,119

Potomac Capital Management, Inc.

$15,963,008

0.79%

155,071

Panoramic Capital, LLC

$15,891,568

0.78%

154,377

GOLDMAN SACHS GROUP INC

$14,343,041

0.71%

139,334

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	117,770	$12,123,243	84.5%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	21,564	$2,219,798	15.5%	Defined

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$14,337,277

0.71%

139,278

BANK OF AMERICA CORP /DE/

$13,864,576

0.68%

134,686

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	126,373	$13,008,836	93.8%	Defined
BOFA SECURITIES, INC.	8,313	$855,740	6.2%	Defined

NORTHERN TRUST CORP

$12,685,398

0.63%

123,231

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	121,423	$12,499,283	98.5%	Defined
DWS INVESTMENT MANAGEMENT AMERICAS, INC joint	1,808	$186,115	1.5%	Other

VANGUARD FIDUCIARY TRUST CO

$12,455,637

0.62%

120,999

KIRR MARBACH & CO LLC /IN/

$11,948,142

0.59%

116,069

D. E. Shaw & Co., Inc.

$9,572,390

0.47%

92,990

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

Manager	Shares	Value (USD)	% of position	Discretion
D. E. SHAW & CO, L.P.	92,990	$9,572,390	100.0%	Defined

CITADEL ADVISORS LLC

$9,326,364

0.46%

90,600

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	90,600	$9,326,364	100.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$8,492,550

0.42%

82,500

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

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	82,500	$8,492,550	100.0%	Other

MORGAN STANLEY

$8,278,946

0.41%

80,425

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	589	$60,631	0.7%	Defined
MORGAN STANLEY & CO. LLC	17,355	$1,786,523	21.6%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	29,620	$3,049,082	36.8%	Defined
MORGAN STANLEY SMITH BARNEY LLC	3,672	$377,995	4.6%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	29,189	$3,004,715	36.3%	Defined

OpenArc Corporate Advisory, LLC

$7,779,793

0.38%

75,576

Beartown Capital Management, LLC

$7,720,500

0.38%

75,000

Granahan Investment Management, LLC

$7,424,135

0.37%

72,121

JANE STREET GROUP, LLC

$7,174,918

0.35%

69,700

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	69,700	$7,174,918	100.0%	Defined

Bank of New York Mellon Corp

$7,141,355

0.35%

69,374

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

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Investments Corporation	42,054	$4,329,038	60.6%	Defined
The Bank of New York Mellon	22,972	$2,364,737	33.1%	Defined
BNY Mellon, NA joint	3,095	$318,598	4.5%	Defined
BNY Mellon Advisors, Inc.	1,252	$128,880	1.8%	Defined
Held directly	1	$102	0.0%	Defined

Marble Bar Asset Management LLP

$7,025,449

0.35%

68,248

683 Capital Management, LLC

$6,794,040

0.34%

66,000

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	66,000	$6,794,040	100.0%	Defined

CITIGROUP INC

$6,176,193

0.31%

59,998

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	59,998	$6,176,193	100.0%	Defined

Trexquant Investment LP

$5,499,363

0.27%

53,423

TD Asset Management Inc

$5,482,378

0.27%

53,258

Informed Momentum Co LLC

$5,407,849

0.27%

52,534

Potrero Capital Research LLC

$4,789,283

0.24%

46,525

Teton Advisors, LLC

$4,426,420

0.22%

43,000

Caption Management, LLC

$4,117,600

0.20%

40,000

Nuveen, LLC

$3,685,046

0.18%

35,798

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	11,765	$1,211,089	32.9%	Defined
TEACHERS ADVISORS, LLC joint	24,033	$2,473,957	67.1%	Defined

Creative Planning

$3,555,649

0.18%

34,541

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

Manager	Shares	Value (USD)	% of position	Discretion
CREATIVE PLANNING TRUST Co LLC	2,186	$225,026	6.3%	Defined
Held directly	32,355	$3,330,623	93.7%	Sole

GILDER GAGNON HOWE & CO LLC

$3,379,829

0.17%

32,833

WELLINGTON MANAGEMENT GROUP LLP

$3,191,757

0.16%

31,006

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

Manager	Shares	Value (USD)	% of position	Discretion
Wellington Management Company LLP	17,906	$1,843,243	57.8%	Defined
Wellington Trust Company, NA joint	11,700	$1,204,398	37.7%	Defined
Wellington Management Australia Pty Ltd	1,400	$144,116	4.5%	Defined

HRT FINANCIAL LP

$3,157,478

0.16%

30,673

MILLENNIUM MANAGEMENT LLC

$3,123,199

0.15%

30,340

Caption Management, LLC

$2,573,500

0.13%

25,000

EVR Research LP

$2,573,500

0.13%

25,000

UBS Group AG

$2,472,412

0.12%

24,018

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

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	24,018	$2,472,412	100.0%	Defined

Campbell & CO Investment Adviser LLC

$2,170,386

0.11%

21,084

HARBOR CAPITAL ADVISORS, INC.

$2,141,666

0.11%

20,805

HANSEATIC MANAGEMENT SERVICES INC

$1,895,948

0.09%

18,418

Caption Management, LLC

$1,804,744

0.09%

17,532

JANE STREET GROUP, LLC

$1,802,067

0.09%

17,506

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	17,506	$1,802,067	100.0%	Defined

Quantinno Capital Management LP

$1,773,553

0.09%

17,229

WOODMONT INVESTMENT COUNSEL LLC

$1,747,200

0.09%

16,973

JPMORGAN CHASE & CO

$1,697,377

0.08%

16,489

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.	4,762	$490,200	28.9%	Defined
J.P. Morgan Investment Management Inc.	11,615	$1,195,648	70.4%	Defined
J.P. Morgan Securities plc	112	$11,529	0.7%	Defined

CITADEL ADVISORS LLC

$1,688,216

0.08%

16,400

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	16,400	$1,688,216	100.0%	Defined

STATE OF WISCONSIN INVESTMENT BOARD

$1,654,245

0.08%

16,070

AMERICAN CENTURY COMPANIES INC

$1,619,349

0.08%

15,731

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

Manager	Shares	Value (USD)	% of position	Discretion
AMERICAN CENTURY INVESTMENT MANAGEMENT INC	15,731	$1,619,349	100.0%	Defined

DEUTSCHE BANK AG\

$1,610,289

0.08%

15,643

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

Manager	Shares	Value (USD)	% of position	Discretion
Deutsche Bank Trust Co Americas	4,207	$433,068	26.9%	Defined
DWS INVESTMENT MANAGEMENT AMERICAS, INC	226	$23,264	1.4%	Defined
DWS Investments UK Ltd	11,210	$1,153,957	71.7%	Defined

TORONTO DOMINION BANK

$1,605,864

0.08%

15,600

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

Manager	Shares	Value (USD)	% of position	Discretion
TD SECURITIES (USA) LLC	15,600	$1,605,864	100.0%	Defined

WELLS FARGO & COMPANY/MN

$1,507,864

0.07%

14,648

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	10,480	$1,078,811	71.5%	Defined
WELLS FARGO ADVISORS FINANCIAL NETWORK, LLC	63	$6,485	0.4%	Defined
WELLS FARGO CLEARING SERVICES, LLC	4,105	$422,568	28.0%	Defined

RHUMBLINE ADVISERS

$1,475,850

0.07%

14,337

AQR CAPITAL MANAGEMENT LLC

$1,383,203

0.07%

13,437

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

Manager	Shares	Value (USD)	% of position	Discretion
Arax Advisory Partners	278	$28,617	2.1%	Other
HALBERT HARGROVE GLOBAL ADVISORS, LLC	137	$14,102	1.0%	Other
Stokes Family Office, LLC	6	$617	0.0%	Other
Held directly	13,016	$1,339,867	96.9%	Defined

CAXTON ASSOCIATES LLP

$1,382,690

0.07%

13,432

GWN SECURITIES INC.

$1,381,969

0.07%

13,425

ALLIANCEBERNSTEIN L.P.

$1,372,190

0.07%

13,330

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

Manager	Shares	Value (USD)	% of position	Discretion
Equitable Holdings, Inc.	13,330	$1,372,190	100.0%	Defined

Quadrature Capital Ltd

$1,336,058

0.07%

12,979

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

Manager	Shares	Value (USD)	% of position	Discretion
Quadrature US Inc.	12,979	$1,336,058	100.0%	Other

Jefferson Bridge Capital, LLC

$1,333,073

0.07%

12,950

LPL Financial LLC

$1,271,617

0.06%

12,353

Vanguard Global Advisers, LLC

$1,115,972

0.06%

10,841

FCG Investment Co

$1,107,840

0.05%

10,762

Waterfront Wealth Inc.

$1,102,899

0.05%

10,714

JANE STREET GROUP, LLC

$1,060,282

0.05%

10,300

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	10,300	$1,060,282	100.0%	Defined

Numerai GP LLC

$1,057,296

0.05%

10,271

Potomac Capital Management, Inc.

$1,029,400

0.05%

10,000

STRS OHIO

$1,008,812

0.05%

9,800

CITADEL ADVISORS LLC

$927,901

0.05%

9,014

Gotham Asset Management, LLC

$912,768

0.05%

8,867

XTX Topco Ltd

$883,431

0.04%

8,582

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	8,582	$883,431	100.0%	Defined

Gem Investment Advisors, LLC

$739,418

0.04%

7,183

CenterBook Partners LP

$707,918

0.03%

6,877

MetLife Investment Management, LLC

$684,653

0.03%

6,651

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

Manager	Shares	Value (USD)	% of position	Discretion
METLIFE INC	6,651	$684,653	100.0%	Defined

Covestor Ltd

$683,212

0.03%

6,637

Inspire Investing, LLC

$679,815

0.03%

6,604

OCCUDO QUANTITATIVE STRATEGIES LP

$675,492

0.03%

6,562

PRUDENTIAL FINANCIAL INC

$672,404

0.03%

6,532

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

Manager	Shares	Value (USD)	% of position	Discretion
PGIM Quantitative Solutions LLC	6,532	$672,404	100.0%	Defined

Point72 Asset Management, L.P.

$638,228

0.03%

6,200

Aster Capital Management (DIFC) Ltd

$627,934

0.03%

6,100

Central Pacific Bank - Trust Division

$617,640

0.03%

6,000

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$574,816

0.03%

5,584

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

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	5,584	$574,816	100.0%	Other

FIRST TRUST ADVISORS LP

$574,199

0.03%

5,578

SIMPLEX TRADING, LLC

$553,508

0.03%

5,377

MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.

$544,552

0.03%

5,290

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	5,290	$544,552	100.0%	Defined

Key facts CIK 1304492 CUSIP 03676C100 13F (30d) 3 filings 3 filers Visit website Investor relations