Anterix Inc.
ATEX- Exchange
- Nasdaq
- Industry
- Telephone Communications (No Radiotelephone)
- SEC CIK
- 0001304492
In the last 90 days, Anterix Inc. insiders filed 0 open-market purchases and 10 sales; 174 institutions reported holding it in 13F filings for Q2 2026, worth $1.97B in total; no superinvestor holds it.
Holders of 5% or more of ATEX
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Anterix Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Owl Creek Asset Management, L.P. | 13D/A | 28.50%5.55M shares | – | Feb 14, 20233 filings | Jul 8, 2026 | SEC |
| T. Rowe Price Investment Management, Inc. | 13G | 12.00%2.35M shares | New | Jul 8, 20261 filing | Jul 8, 2026 | SEC |
| Heard Capital LLC | 13D/A | 9.40%1.74M shares | – | Feb 13, 20235 filings | Mar 5, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
31 Schedule 13D and 13G filings on Anterix Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Oct 27, 20265:25 PM ET | BlackRock, Inc. | 13G/A | 4.70%914.4K shares | −0.40 ppfrom 5.10%Below 5% | Sep 30, 2026 | SEC |
| Jul 27, 20264:25 PM ET | BlackRock, Inc. | 13G | 5.10%999.3K shares | +0.12 ppfrom 4.98% | Jun 30, 2026 | SEC |
| Jul 8, 20265:22 PM ET | Owl Creek Asset Management, L.P.and 1 other | 13D/A | 28.50%5.55M shares | – | Jun 25, 2026 | SEC |
| Jul 8, 202611:30 AM ET | T. Rowe Price Investment Management, Inc. | 13G | 12.00%2.35M shares | New | Jun 30, 2026 | SEC |
| Apr 27, 20264:12 PM ET | BlackRock, Inc. | 13G/A | 4.98%934.6K shares | −0.12 ppfrom 5.10%Below 5% | Mar 31, 2026 | SEC |
| Jan 30, 20261:30 PM ET | Vanguard Group Inc | 13G/A | 4.97%931.3K shares | –Below 5% | Dec 31, 2025 | SEC |
| Nov 12, 20253:52 PM ET | DG Capital Management, LLCand 1 other | 13G/A | 4.00%744.5K shares | −1.20 ppfrom 5.20%Below 5% | Sep 30, 2025 | SEC |
| Oct 17, 20256:05 PM ET | BlackRock, Inc. | 13G/A | 5.10%950.8K shares | – | Sep 30, 2025 | SEC |
| Aug 14, 202511:57 AM ET | DG Capital Management, LLCand 1 other | 13G | 5.20%975.7K shares | New | Jun 30, 2025 | SEC |
| Mar 5, 20259:19 PM ET | Heard Capital LLCand 3 others | 13D/A | 9.40%1.74M shares | – | Feb 28, 2025 | SEC |
| Dec 9, 2024 | Owl Creek Asset Management, L.P. | 13D/AOld format | – | – | – | SEC |
| Nov 12, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Nov 4, 2024 | Vanguard Group Inc | 13GOld format | – | New | – | SEC |
| Oct 25, 2024 | GIC Private Ltd | 13G/AOld format | – | – | – | SEC |
| Aug 8, 2024 | Heard Capital LLC | 13D/AOld format | – | – | – | SEC |
| Jul 29, 2024 | Heard Capital LLC | 13DOld format | – | – | – | SEC |
| Feb 13, 2024 | Heard Capital LLC | 13G/AOld format | – | – | – | SEC |
| Feb 8, 2024 | GIC Private Ltd | 13G/AOld format | – | – | – | SEC |
| Jan 29, 20243:26 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jul 10, 2023 | Morgan Stanley | 13G/AOld format | – | – | – | SEC |
| Apr 10, 2023 | GIC Private Ltd | 13GOld format | – | New | – | SEC |
| Feb 14, 2023 | Owl Creek Asset Management, L.P. | 13D/AOld format | – | – | – | SEC |
| Feb 13, 2023 | Heard Capital LLC | 13GOld format | – | New | – | SEC |
| Feb 8, 2023 | Morgan Stanley | 13G/AOld format | – | – | – | SEC |
| Feb 3, 202312:10 PM ET | BlackRock Inc. | 13GOld format | – | New | – | SEC |
| Feb 11, 2022 | Pacific Investment Management Co LLC | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2022 | Morgan Stanley | 13G/AOld format | – | – | – | SEC |
| Feb 16, 2021 | Pacific Investment Management Co LLC | 13G/AOld format | – | – | – | SEC |
| Feb 11, 2021 | Lomas Capital Management, LLC | 13G/AOld format | – | – | – | SEC |
| Feb 10, 2021 | Morgan Stanley | 13GOld format | – | New | – | SEC |
| Feb 2, 20218:04 AM ET | American Financial Group Inc | 13G/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
24 notices from officers, directors and other affiliates planning to sell Anterix Inc. shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Oct 9, 20264:02 PM ET | Elena MarquezOfficer | 4.98K | $400.6K | Oct 9, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Sep 21, 20264:01 PM ET | Scott LangOfficer · Director | 15.0K | $1.20M | Sep 21, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Sep 10, 20264:06 PM ET | Heather MartinOfficer | 8.06K | $679.0K | Sep 10, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Sep 8, 20265:09 PM ET | Gena L AsheOfficer | 4.36K | $372.3K | Sep 8, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 25, 20264:25 PM ET | Christopher Guttman-McCabeOfficer | 23.4K | $2.16M | Aug 25, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 24, 20264:12 PM ET | Thomas KuhnDirector | 10.0K | $888.5K | Aug 24, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 14, 20266:34 PM ET | Scott LangOfficer · Director | 35.1K | $3.16M | Aug 14, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Jun 17, 20264:02 PM ET | Elena MarquezOfficer | 4.29K | $341.1K | Jun 17, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Jun 16, 20263:15 PM ET | Yazdi MahvashDirector | 7.00K | $560.0K | Jun 16, 2026 | Charles Schwab Corp | SEC |
| Jun 15, 20264:51 PM ET | Christopher Guttman-McCabeOfficer | 122.9K | $10.0M | Jun 15, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Jun 15, 20264:10 PM ET | Gena L AsheOfficer | 17.7K | $1.44M | Jun 15, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Apr 17, 20264:09 PM ET | Ryan L GerbrandtOfficer | 25.0K | $1.06M | Apr 17, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Apr 16, 20264:44 PM ET | Ryan L GerbrandtOfficer | 26.9K | $1.08M | Apr 16, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Mar 3, 20264:26 PM ET | Gena L AsheOfficer | 12.4K | $449.6K | Mar 3, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Mar 2, 20265:39 PM ET | Ryan L GerbrandtOfficer | 22.6K | $837.6K | Mar 2, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Feb 19, 20264:47 PM ET | Ryan L GerbrandtOfficer | 28.5K | $975.6K | Feb 19, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Nov 18, 20255:11 PM ET | Gena AsheOfficer | 6.56K | $139.1K | Nov 18, 2025 | Merrill Lynch | SEC |
| Feb 20, 20254:50 PM ET | Obrien Morgan EAffiliate | 50.0K | $2.04M | Feb 20, 2025 | RBC CAPITAL MARKETS LLC | SEC |
| Dec 16, 20241:41 PM ET | Obrien Morgan EOfficer · Director | 13.6K | $454.9K | Dec 16, 2024 | RBC CAPITAL MARKETS LLC | SEC |
| Nov 19, 20245:27 PM ET | Ashe Gena LOfficer | 5.55K | $183.1K | Nov 19, 2024 | MORGAN STANLEY SMITH BARNEY LLC EXECUTIVE SERVICES | SEC |
| May 3, 20244:44 PM ET | Timothy A GrayOfficer | 16.7K | $537.6K | May 3, 202410b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 2, 20244:13 PM ET | Timothy A GrayOfficer | 16.7K | $531.8K | May 2, 202410b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 1, 20244:36 PM ET | Timothy A GrayOfficer | 16.7K | $535.0K | May 1, 202410b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Jun 16, 20234:27 PM ET | Ashe Gena LOfficer | 7.24K | $251.2K | Jun 16, 2023 | ETRADE FINANCIAL CORPORATION | SEC |