$ATEX

$85.62 +$5.98 (7.51%) Close

$ATEX Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 19.6M shares outstanding

Who owns ATEX?

By type of holder

Institutions 97.4% Insiders 2.6% Everyone else 0.0%

Concentration Top 10 holders own 103.7%

Jeffrey A. Altman 28.3% · Owl Creek Asset Management, L.P. 27.6%

Institutional ownership

97.4%

+11.1 pts vs last qtr

Institutional holders

170

+38 vs last qtr

Net shares bought

+2.2M

by institutions in Q2 2026

New / sold out

58 / 20

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

T. Rowe Price Investment Management, Inc. NEW +2.3M
Price T Rowe Associates Inc /MD/ +742.5K

Biggest sellers in Q2 2026

Jane Street Group, LLC −403.4K
Millennium Management LLC −277.6K

Who is planning to sell?

Notices of proposed sale, last 12 months

$25.8M

17 notices from 10 people

Shares covered

374.7K

1.91% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Christopher Guttman-Mccabe Officer $12.2M
Scott Lang Officer $4.36M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2020–FY2026

+14.2%

+2.24% a year

Each share's claim on the business

−12.4%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$57.2M vs —

over 7 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years65% 3–5 years3% 1–3 years1% Under 1 year31%

Quarterly turnover

24.0%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ATEX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
OC Owl Creek Asset Management, L.P. 13D · 27.7%	5.4M	27.60%	Unchanged	≤2021	46.1%
Shares held by quarter Peak holding5.4M (Q3'24) Change over 8 quarters0 Share of the company27.600% Disclosed stake13D · 27.7% Owl Creek Asset Management, L.P.'s full portfolio →
TR T. Rowe Price Investment Management, Inc.	2.3M	11.97%	NEW	Q2 '26	0.2%
Shares held by quarter Peak holding2.3M (Q2'26) Change over 8 quarters+2.3M Share of the company11.970% T. Rowe Price Investment Management, Inc.'s full portfolio →

Owl Creek Asset Management, L.P.

13D · 27.7%

5.4M

% of company

27.60%

Change vs last qtr

Unchanged

Held since

≤2021

T. Rowe Price Investment Management, Inc.

2.3M

% of company

11.97%

Change vs last qtr

NEW

Held since

Q2 '26

28 more super investors behind a free account

See every manager holding Anterix Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ATEX on Form N-PORT; together they hold 32.2% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
TR T. Rowe Price Small-Cap Stock Fund, Inc. T. Rowe Price Small-Cap Stock Fund, Inc.	$74.7M	725.5K	3.70%	0.80%	June 30, 2026
JH Janus Henderson Contrarian Fund Janus Investment Fund	$65.3M	634.8K	3.24%	1.19%	June 30, 2026

T. Rowe Price Small-Cap Stock Fund, Inc.

Position value

$74.7M

% of company

3.70%

% of the fund

0.80%

As of

June 30, 2026

Janus Henderson Contrarian Fund

Janus Investment Fund

Position value

$65.3M

% of company

3.24%

% of the fund

1.19%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Anterix Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
JA Jeffrey A. Altman 5%+ holder 13D · 28.5%	5.6M	28.31%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company28.310% Disclosed stake13D · 28.5% View the 13D/G filing →
WH William Heard 5%+ holder 13D · 9.4%	1.7M	8.88%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company8.880% Disclosed stake13D · 9.4% View the 13D/G filing →

Jeffrey A. Altman

5%+ holder13D · 28.5%

5.6M

% of company

28.31%

Change vs last qtr

—

Held since

—

William Heard

5%+ holder13D · 9.4%

1.7M

% of company

8.88%

Change vs last qtr

—

Held since

—

13 more holders behind a free account

See every insider and 5%+ holder of Anterix Inc..

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