Company · Ownership research

Anterix Inc. ATEX

CIK 0001304492 · CUSIP 03676C100

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 03676C100 (ATEX), not CUSIP 03676C900 (ATEX), CUSIP 03676C950 (ATEX), and does not merge CUSIPs.

This page lists the top 20 of 132 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	Owl Creek Asset Management, L.P. CIK 1313756 · View history	$206.68M 5,411,776 shares	39.93%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2026	▾
02	Heard Capital LLC CIK 1796409 · View history	$65.56M 1,716,738 shares	3.39%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2026	▾
03	BlackRock, Inc. CIK 2012383 · View history	$38.46M 1,007,143 shares	0.00%	-11.13K(-1.10%)Reduced	SEC filing ↗ May 13, 2026	▾
04	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$21.92M 573,847 shares	0.00%	—	SEC filing ↗ May 15, 2026	▾
05	QVT Financial LP CIK 1290162 · View history	$19.25M 503,941 shares	1.52%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2026	▾
06	PLUSTICK MANAGEMENT LLC CIK 1643351 · View history	$19.08M 499,596 shares	9.21%	+499.60KNew	SEC filing ↗ May 15, 2026	▾
07	GAMCO INVESTORS, INC. ET AL CIK 807249 · View history	$16.26M 425,820 shares	0.16%	+3.35K(+0.80%)Added	SEC filing ↗ May 14, 2026	▾
08	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$16.22M 424,856 shares	0.00%	+99.93K(+30.80%)Added	SEC filing ↗ May 7, 2026	▾
09	JANE STREET GROUP, LLC CIK 1595888 · View history	$16.07M 420,857 shares	0.02%	+261.84K(+164.70%)Added	SEC filing ↗ May 12, 2026	▾
10	STATE STREET CORP CIK 93751 · View history	$14.81M 387,918 shares	0.00%	+54.13K(+16.20%)Added	SEC filing ↗ May 15, 2026	▾
11	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$14.30M 374,301 shares	0.00%	+14.16K(+3.90%)Added	SEC filing ↗ May 15, 2026	▾
12	GARNET EQUITY CAPITAL HOLDINGS, INC. CIK 1423876 · View history	$13.12M 343,496 shares	7.45%	-53.90K(-13.60%)Reduced	SEC filing ↗ May 15, 2026	▾
13	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$11.76M 307,922 shares	0.01%	-132.02K(-30.00%)Reduced	SEC filing ↗ May 15, 2026	▾
14	GABELLI FUNDS LLC CIK 1081407 · View history	$10.15M 265,800 shares	0.07%	-39.11K(-12.80%)Reduced	SEC filing ↗ May 14, 2026	▾
15	Potrero Capital Research LLC CIK 1536630 · View history	$8.77M 229,561 shares	5.38%	+229.56KNew	SEC filing ↗ May 15, 2026	▾
16	AYAL Capital Advisors Ltd CIK 2011524 · View history	$7.53M 197,119 shares	3.85%	-67.88K(-25.60%)Reduced	SEC filing ↗ May 15, 2026	▾
17	HRT FINANCIAL LP CIK 1475597 · View history	$6.68M 174,925 shares	0.02%	+131.84K(+306.00%)Added	SEC filing ↗ May 14, 2026	▾
18	Potomac Capital Management, Inc. CIK 1418746 · View history	$6.64M 173,802 shares	5.80%	+12.40K(+7.70%)Added	SEC filing ↗ May 14, 2026	▾
19	DG Capital Management, LLC CIK 1512716 · View history	$6.42M 168,217 shares	2.78%	+146.97K(+691.80%)Added	SEC filing ↗ May 13, 2026	▾
20	BANK OF AMERICA CORP /DE/ CIK 70858 · View history	$6.41M 167,781 shares	0.00%	+24.66K(+17.20%)Added	SEC filing ↗ May 18, 2026	▾

Showing 20 / 132 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

132

Cancelled or null records excluded

Disclosed shares

16,932,904

Not deduplicated across managers

Disclosed value

$646.46M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Anterix Inc. · Q1 2026

Explore all 132 reporting institutions.

This page includes 20 of 132 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

Download CSV
Earlier quarters
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. This page lists 20 of 132 reporting institutions; totals use the complete disclosed data.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.

MCP  https://api.akkrudata.ai/mcp

akkru_institutional_holdings
{"action":"holders","cusip":"03676C100","quarter":"2026Q1","type":"positions","page_size":100}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP / CLI documentation: /documents
llms.txt: /llms.txt

Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.