ATN International ATNI Insider Ownership

NASDAQ ATNI

$25.52 -0.19 (-0.74%)

As of: Oct 21, 2026 · 9:30 AM EDT

Insider Holdings by Owner

5.13Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

34.38%

▼-2.82% pp QoQ

Shares Held by Insiders

5.29Mn

filed for Sep 2026

▼-7.58% QoQ

Shares Outstanding

15.40Mn

15,403,357 shares

Direct Holdings

5.03Mn

Indirect: 264.11K

Net Shares Traded (QoQ)

-434.32K

net selling in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 10, 2026

Over the trailing 12 months, ATNI insiders sold $4.62 million worth of shares (157.33K shares) in open-market trades, with no open-market purchases.

Counted by insider, open-market selling of ATNI stock in the past 12 months came from 3 insiders, with no insider buying.
Cornelius B. Prior Jr. (10% owner) led open-market sales of ATN International stock over the past 12 months with $4.38 million (149.83K shares), most recently on September 3, 2026.
In transactions other than open-market trades, ATN International insiders received 123.69K shares in stock awards, acquired 27.9K shares through option exercises and conversions, gave up 47.21K shares to cover taxes or exercise prices and gave away 279.7K shares as gifts over the past 12 months.
Per Business Quant, ATNI insiders together hold 5.26Mn shares based on their latest Form 4 filings, down 8.21% from 5.73Mn shares at the end of Q2 2026.
By type of ownership, ATNI insiders hold 95.17% of their shares directly (5Mn shares) and 4.83% indirectly (254.24K shares).
Business Quant counts 12 insiders with holdings in ATN International stock, among the officers, directors and 10% owners who have filed a Form 4 in the past two years.
ATNI's largest insider holders by reported holdings are Cornelius B. Prior Jr. (10% owner, 4.06Mn shares), Michael T. Prior (Director, 732.3K shares) and Brad W. Martin (Chief Executive Officer, 126.13K shares).
Of the shares held by ATNI insiders, 77.28% belong to Cornelius B. Prior Jr.
Institutional investors held 61.77% of ATN International stock at the end of Q2 2026, while the latest Form 4 filings of its insiders account for about 34.14%; other investors, including the public, hold roughly 4.09%.
In the past year, 12 insiders of ATN International submitted 41 Form 4 filings reporting trades, awards or other transactions.
The insider holdings and trades above for ATN International reflect Form 4 filings through October 5, 2026.

Form 4 Holdings

Insiders Holding ATNI

Insiders 16

Shares held 5.13Mn

Of outstanding 33.28%

#	Insider	Position	Direct	Total	Share of Insiders	Last Filed
1	Cornelius B Jr Prior	Chairman	3,956,303	3,956,303	77.2%	05 Oct, 2026
2	Michael T Prior	Chairman And Ceo	587,673	587,673	11.5%	27 Mar, 2026
3	Brad W Martin	Chief Executive Officer	126,129	126,129	2.5%	27 Mar, 2026
4	Justin D Benincasa	Cfo	68,135	68,135	1.3%	27 Mar, 2024
5	Mary Mabey	Svp And General Counsel	60,402	60,402	1.2%	11 Aug, 2026
6	Carlos Doglioli	Chief Financial Officer	50,449	50,449	1.0%	19 Mar, 2026
7	Justin M Leon	Svp, Corporate Development	49,707	49,707	1.0%	27 Mar, 2026
8	Pamela F Lenehan	Director	38,086	38,086	0.7%	17 Jun, 2026
9	Bernard J Bulkin	Director	37,217	37,217	0.7%	18 Jun, 2026
10	Naji Khoury	Ceo	36,853	36,853	0.7%	28 Apr, 2026
11	April Henry	Director	26,338	26,338	0.5%	18 Jun, 2026
12	Richard J Ganong	Director	23,787	23,787	0.5%	20 Jun, 2024
13	Liane J Pelletier	Director	20,816	20,816	0.4%	08 Jun, 2022
14	Patricia Jacobs	Director	19,958	19,958	0.4%	02 Sep, 2026
15	Derek Hudson	Director	15,721	15,721	0.3%	17 Jun, 2026
16	James S Eisenstein	Director	8,982	8,982	0.2%	07 Jun, 2022

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

1,030 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
01 Oct, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed G	13,500	$0.00	$0	3,956,303	Direct
07 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	4,500	$31.03	$139.64K	25,541	Indirect
21 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	5,367	$31.32	$168.09K	20,174	Indirect
04 Sep, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed G	12,500	$0.00	$0	3,969,803	Direct
02 Sep, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	2,582	$31.12	$80.35K	34,583	Indirect
03 Sep, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	4,542	$31.02	$140.88K	30,041	Indirect
31 Aug, 2026	Patricia Jacobs	Director	Disposed S	1,500	$30.04	$45.06K	19,958	Direct
24 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	10,000	$31.34	$313.39K	37,165	Indirect
20 Aug, 2026	Patricia Jacobs	Director	Disposed S	1,000	$31.14	$31.14K	21,458	Direct
19 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	10,000	$31.86	$318.62K	47,665	Indirect
20 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	500	$31.25	$15.63K	47,165	Indirect
17 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	5,745	$31.79	$182.65K	58,665	Indirect
18 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	1,000	$31.75	$31.75K	57,665	Indirect
13 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	2,500	$32.05	$80.13K	64,436	Indirect
14 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	26	$32.10	$835	64,410	Indirect
10 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed G	12,000	$0.00	$0	3,982,303	Direct
10 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	6,500	$32.49	$211.21K	67,436	Indirect
10 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	500	$33.25	$16.63K	66,936	Indirect
10 Aug, 2026	Mary Mabey	Svp And General Counsel	Disposed S	5,000	$32.13	$160.63K	60,402	Direct
06 Aug, 2026	Cornelius B Jr Prior	TenPercentOwner	Disposed S	500	$28.76	$14.38K	80,936	Indirect

Showing 1 to 20 of 1,030 transactions