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.
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 monthDollar 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
latestMost 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
19 ESTATE THOMAS HAVEN SITE
ST THOMAS VI, D8 999999999
Holdings By Company
| 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
| 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 4 of 13
121 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2021-03-15 | ATNI | Tax (F) | −3,021 | -$157.4K | EDGAR |
| 2021-03-11 | ATNI | Grant (A) | +19,350 | $0 | EDGAR |
| 2021-03-10 | ATNI | Tax (F) | −2,428 | -$126.9K | EDGAR |
| 2021-03-09 | ATNI | Tax (F) | −2,409 | -$120.2K | EDGAR |
| 2020-08-13 | ATNI | Sell (S) | −2,000 | -$120.3K | EDGAR |
| 2020-08-03 | ATNI | Sell (S) | −300 | -$19.2K | EDGAR |
| 2020-07-17 | ATNI | Sell (S) | −2,000 | -$125.0K | EDGAR |
| 2020-06-02 | ATNI | Sell (S) | −2,000 | -$120.9K | EDGAR |
| 2020-05-01 | ATNI | Sell (S) | −2,400 | -$183.9K | EDGAR |
| 2020-04-27 | ATNI | Sell (S) | −3,307 | -$230.6K | EDGAR |
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).