$ATNI

$26.30 +$0.39 (1.51%) Close

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

Ownership

13F as of Q2 2026 · 15.4M shares outstanding

Who owns ATNI?

By type of holder

Institutions 61.7% Insiders 38.3% Everyone else 0.0%

Concentration Top 10 holders own 69.5%

Cornelius B. Prior, Jr. 28.2% · Global Alpha Capital Management Ltd. 9.4%

Institutional ownership

61.7%

+2.2 pts vs last qtr

Institutional holders

133

+9 vs last qtr

Net shares bought

+343.5K

by institutions in Q2 2026

New / sold out

19 / 10

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

American Century Companies Inc +98.7K
Citadel Advisors LLC +59.9K

Biggest sellers in Q2 2026

Empirical Finance, LLC SOLD OUT −45.3K
Trexquant Investment LP −42.8K

Who is planning to sell?

Notices of proposed sale, last 12 months

$5.74M

7 notices from 3 people

Shares covered

200.0K

1.30% 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

Cornelius Prior Affiliate $4.8M
Prior Family Foundation DTD 6/9/06 Stakeholder $781K

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, FY2016–FY2025

−6.2%

−0.71% a year

Each share's claim on the business

+6.6%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$59.6M vs $71.4M

over 10 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+ years70% 3–5 years9% 1–3 years10% Under 1 year10%

Quarterly turnover

5.5%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ATNI on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
GA Global Alpha Capital Management Ltd.	1.4M	9.38%	−12.7K (−0.9%)	≤2021	2.3%
Shares held by quarter Peak holding1.6M (Q1'25) Change over 8 quarters+117.1K Share of the company9.380% Global Alpha Capital Management Ltd.'s full portfolio →
B BlackRock, Inc.	923.3K	5.99%	+21.1K (+2.3%)	≤2021	0.0%
Shares held by quarter Peak holding1.0M (Q3'24) Change over 8 quarters−111.3K Share of the company5.990% BlackRock, Inc.'s full portfolio →

Global Alpha Capital Management Ltd.

1.4M

% of company

9.38%

Change vs last qtr

−12.7K (−0.9%)

Held since

≤2021

BlackRock, Inc.

923.3K

% of company

5.99%

Change vs last qtr

+21.1K (+2.3%)

Held since

≤2021

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting ATNI on Form N-PORT; together they hold 22.3% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
AU Avantis U.S. Small Cap Value ETF American Century ETF Trust	$13.5M	479.4K	3.11%	0.05%	May 31, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$7.74M	292.0K	1.90%	0.00%	June 30, 2026

Avantis U.S. Small Cap Value ETF

American Century ETF Trust

Position value

$13.5M

% of company

3.11%

% of the fund

0.05%

As of

May 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$7.74M

% of company

1.90%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding ATN International 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
CB Cornelius B. Prior, Jr. 5%+ holder 13D · 28.2%	4.3M	28.19%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company28.190% Disclosed stake13D · 28.2% View the 13D/G filing →
PM Prior Michael T Insider	854.6K	5.55%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company5.550% Prior Michael T's insider activity →

Cornelius B. Prior, Jr.

5%+ holder13D · 28.2%

4.3M

% of company

28.19%

Change vs last qtr

—

Held since

—

Prior Michael T

Insider

854.6K

% of company

5.55%

Change vs last qtr

—

Held since

—

10 more holders behind a free account

See every insider and 5%+ holder of ATN International Inc.

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