Michael T Prior

CIK 1244465 · CHAIRMAN AND CEO · last filed 2026-03-27

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

Disclosed Exposure

$21.07M

Companies

Total Filings

121

Lifetime Open-Market Net

-$4.61M

Charts

Trading activity, where the exposure sits, and each trade against the stock price.

ATNI price and trades

Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.

Shares held

Shares owned after each reported transaction on this company (direct holdings as reported).

Open-market buying and selling

by month

Dollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.

Exposure by company

latest

OfficerDirector10% owner* stale (no filing in 3 yrs)

Most recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.

Filer Profile

Reported Address

C/O ATLANTIC TELE NETWORK INC
19 ESTATE THOMAS HAVEN SITE
ST THOMAS VI, D8 999999999

Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count in each company: direct shares plus every indirect holder (trusts, LLCs, partnerships, family members) on the latest Form 4 that lists them. Disclosed exposure = shares × current underlying price.

Symbol	Role	Shares	Price	Disclosed Exposure	Lifetime OM Net	Filings	Latest Filed
ATNI	Director	741,965	$28.40	$21.07M	-$4.61M	121	2026-03-27

Holdings By Holder

Who holds the shares on record: the insider directly, and each trust, LLC, partnership or family member reported as an indirect holder on the latest Form 4 that lists them. Holder names come from the filing's footnotes. Rows under No longer reported appeared on earlier filings but not the latest one, usually because the holder was emptied or folded into another; they are not counted in the total.

Symbol	Holder	Shares	Share of Total	Reported
ATNI	Direct	581,213	78.3%	2026-03-27
	Trustee of Lauren S. Prior 2013 Trust	128,847	17.4%	2026-03-27
	Trustee of JP 2018 Trust	8,141	1.1%	2026-03-27
	Trustee of RP 2014 Trust	8,041	1.1%	2026-03-27
	Trustee of Prior Family Trust 2019	7,982	1.1%	2026-03-27
	Trustee of WP 2015 Trust	7,741	1.0%	2026-03-27
	Total	741,965
	No longer reported
	By Child	8,941	—	last 2018-09-05
	Trustee of Samantha R. Prior 2014 Trust	9,886	—	last 2015-03-30
	Trustee of Aidan W. Prior 2015 Trust	10,286	—	last 2015-03-30
	By Children	10,986	—	last 2015-03-16

Recent Filings · Page 6 of 13

121 filings

Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144, so not all of them end in a sale. Under each notice: the role the filer ticked on it, and whether a sale followed (a Form 4 sale within 30 days, or a sale listed on a later notice).

Filed	Symbol	Action	Net Shares	Net $	Link
2019-03-11	ATNI	Tax (F)	−2,401	-$132.2K	EDGAR
2018-12-04	ATNI	Mixed	+18,732	-$1.16M	EDGAR
2018-09-05	ATNI	Sell (S)	−2,000	-$145.4K	EDGAR
2018-08-08	ATNI	Sell (S)	−5,000	-$324.2K	EDGAR
2018-07-11	ATNI	Sell (S)	−1,000	-$56.1K	EDGAR
2018-06-15	ATNI	Sell (S)	−2,400	-$128.1K	EDGAR
2018-06-13	ATNI	Sell (S)	−2,000	-$111.0K	EDGAR
2018-03-22	ATNI	Tax (F)	−2,444	-$147.3K	EDGAR
2018-03-20	ATNI	Tax (F)	−2,333	-$140.3K	EDGAR
2018-03-12	ATNI	Tax (F)	−4,846	-$294.3K	EDGAR

Showing 51–60 of 121

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Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment, and an amended or cancelled notice is not listed. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes. Someone who is no longer an officer or director (or never was) files no Form 4, so for them a sale shows up only on a later notice, which lists the seller's sales from the 3 months before it. "No sale on file" means neither record shows one; a dash in Net $ means the value filed on the notice doesn't fit the stock's price (likely a typo).