Anterix
Commercializes 900 MHz spectrum for utility private broadband networks.
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Breakdown13F · Form 4
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 19.50M · Float —
Float — provider float is below the insider stake.
The provider's float is smaller than the insider stake it should exclude, so it is not shown.
Institutions13F, as of Jun 30, 2026
191 holders · 19.51M shares · 62 new positions · 109 increased · 45 reduced · 20 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Owl Creek Asset Management, L.P. | 5.41M | 27.75% | 0 | Aug 14, 2026 |
| T. Rowe Price Investment Management, Inc. | 2.35M | 12.04% | +2.35Mnew | Aug 14, 2026 |
| Heard Capital LLC | 1.72M | 8.80% | 0 | Aug 11, 2026 |
| BlackRock, Inc. | 1.08M | 5.51% | +68.0K | Aug 7, 2026 |
| Price T Rowe Associates Inc /MD/ | 750.5K | 3.85% | +742.5K | Aug 14, 2026 |
| Jupiter Topco LLC | 662.4K | 3.40% | +662.4Knew | Aug 14, 2026 |
| Vanguard Capital Management LLC | 553.0K | 2.84% | −20.8K | Aug 13, 2026 |
| Plustick Management LLC | 520.0K | 2.67% | +20.4K | Aug 14, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Jeffrey A. Altmanincl. Owl Creek Asset Management, L.P. | 28.50% | 5.55M | 13D | Jul 8, 2026 ↗ |
| T. Rowe Price Investment Management, Inc. | 12.00% | 2.35M | 13G | Jul 8, 2026 ↗ |
| Heard Investment Manager LLCincl. William Heard, William E. Heard Declaration of Trust +1 more | 9.40% | 1.74M | 13D | Mar 5, 2025 ↗ |
| BlackRock, Inc. | 5.10% | 999.3K | 13G | Jul 27, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| William Heard | director | 1.67M | 8.59% | Aug 20, 2026 |
| Timothy Gray | officer: Chief Financial Officer | 77.0K | 0.40% | Aug 21, 2025 |
| Leslie B. Daniels | director | 58.1K | 0.30% | Aug 6, 2026 |
| Christopher Guttman-McCabe | officer: Chief Reg & Comm Officer | 44.9K | 0.23% | Aug 27, 2026 |
| Ryan Gerbrandt | officer: Chief Operating Officer | 42.4K | 0.22% | Jul 15, 2025 |
| Scott A. Lang | director, officer: President and CEO | 41.5K | 0.21% | Aug 17, 2026 |
| Heather Martin | officer, other: Chief Marketing Officer | 38.3K | 0.20% | May 22, 2026 |
| Mahvash Yazdi | director | 21.0K | 0.11% | Aug 6, 2026 |
| Elena Marquez | officer: Chief Financial Officer | 18.2K | 0.09% | Jul 14, 2026 |
| Thomas R. Kuhn | director, other: Executive Chairman | 17.7K | 0.09% | Aug 26, 2026 |
3 ten-percent owners hold 8.56M shares by Form 4, outside the officers-and-directors figure above · 21 people have not refiled in the last 18 months (880.3K shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 25, 2026 | Christopher Guttman-McCabeofficer: Chief Reg & Comm Officer | Sale · 4 lots | 23,439 | $92.36 | 44,876 |
| Aug 24, 2026 | Thomas R. Kuhndirector, other: Executive Chairman | Sale · 4 lots | 10,000 | $88.85 | 17,731 |
| Jun 18, 2026 | Thomas R. Kuhndirector, other: Executive Chairman | Sale | 1,654 | $79.52 | 17,731 |
| Aug 14, 2026 | William Hearddirector | Sale | 46,400 | $90.11 | 1,670,338 |
| Aug 14, 2026 | Scott A. Langdirector, officer: President and CEO | Sale · 4 lots | 35,057 | $90.22 | 41,470 |
| Jun 15, 2026 | Christopher Guttman-McCabeofficer: Chief Reg & Comm Officer | Sale · 11 lots | 214,289 | $82.05 | 46,392 |
| Jun 18, 2026 | Scott A. Langdirector, officer: President and CEO | Sale | 170 | $80.25 | 76,527 |
| Jun 17, 2026 | Elena Marquezofficer: Chief Financial Officer | Sale | 4,291 | $79.50 | 18,387 |
| Jun 16, 2026 | Mahvash Yazdidirector | Sale | 7,000 | $80.00 | 19,407 |
| Jun 15, 2026 | Mark Fleischhauerdirector | Sale | 3,500 | $79.83 | 12,769 |
CongressHouse and Senate disclosures
Not reported.