Anterix Inc
Ownership
Ownership Structure
Who owns Anterix Inc (ATEX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 69.8% of the shares are freely tradable; institutional investors hold 91.8%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Owl Creek Asset Management LP | 28.10 | 5,411,776 | +0.0 | 06/30/2026 |
| Heard Capital LLC | 8.91 | 1,716,738 | +0.0 | 06/30/2026 |
| BlackRock Inc | 5.23 | 1,007,143 | -1.1 | 03/31/2026 |
| Vanguard Capital Management, LLC | 2.98 | 573,847 | +0.0 | 03/31/2026 |
| PlusTick Management LLC | 2.70 | 520,000 | +4.1 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| T. Rowe Price Small-Cap Stock | 5.35 | 1,030,190 | +35.7 | 07/31/2026 |
| Janus Henderson Contrarian D | 4.89 | 941,789 | +48.4 | 08/31/2026 |
| T. Rowe Price US Small-Cap Core Equity | 3.94 | 759,203 | +0.0 | 06/30/2026 |
| Janus Henderson US Opportunistic Alpha | 3.30 | 634,831 | +0.0 | 06/30/2026 |
| T. Rowe Price Instl Small-Cap Stock | 2.95 | 568,489 | +38.4 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Heard William | Director | 1,674,303 | 129,591,052 $ | Aug 14, 2026 | both |
| Guttman-McCabe Christopher | Chief Reg & Comm Officer | 44,876 | 3,473,402 $ | Aug 25, 2026 | direct |
| Daniels Leslie B | Director | 43,477 | 3,365,120 $ | Sep 10, 2026 | direct |
| Lang Scott A. | President and CEO | 41,470 | 3,209,778 $ | Aug 14, 2026 | direct |
| Martin Heather | Chief Marketing Officer | 26,743 | 2,069,908 $ | Sep 10, 2026 | direct |
| Yazdi Mahvash | Director | 21,005 | 1,625,787 $ | Aug 4, 2026 | direct |
| Marquez Elena | Chief Financial Officer | 18,156 | 1,405,274 $ | Jul 13, 2026 | direct |
| Kuhn Thomas R. | Director | 17,731 | 1,372,379 $ | Aug 24, 2026 | direct |
| Altman Jeffrey A | Director | 17,014 | 1,316,884 $ | Aug 4, 2026 | direct |
| Fleischhauer Mark | Director | 14,367 | 1,112,006 $ | Aug 4, 2026 | direct |
| Ashe Gena L | Chief Legal Officer & Corp Sec | 5,174 | 400,468 $ | Sep 8, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 10, 2026 | Martin Heather | Chief Marketing Officer | Sell | 8,064 | 84.20 | 678,998 |
| Sep 10, 2026 | Daniels Leslie B | Director | Sell | 2,500 | 83.83 | 209,575 |
| Sep 9, 2026 | Martin Heather | Chief Marketing Officer | Other | 3,465 | 85.44 | 296,050 |
| Sep 8, 2026 | Ashe Gena L | Chief Legal Officer & Corp Sec | Sell | 4,064 | 85.44 | 347,228 |
| Sep 8, 2026 | Ashe Gena L | Chief Legal Officer & Corp Sec | Sell | 293 | 85.44 | 25,034 |
| Sep 4, 2026 | Daniels Leslie B | Director | Sell | 1,200 | 86.50 | 103,800 |
| Sep 4, 2026 | Daniels Leslie B | Director | Sell | 2,900 | 87.31 | 253,200 |
| Sep 3, 2026 | Daniels Leslie B | Director | Sell | 6,000 | 87.15 | 522,900 |
| Aug 25, 2026 | Guttman-McCabe Christopher | Chief Reg & Comm Officer | Sell | 2,696 | 90.61 | 244,283 |
| Aug 25, 2026 | Guttman-McCabe Christopher | Chief Reg & Comm Officer | Sell | 7,580 | 91.69 | 695,044 |
| Aug 25, 2026 | Guttman-McCabe Christopher | Chief Reg & Comm Officer | Sell | 7,791 | 92.77 | 722,764 |
| Aug 25, 2026 | Guttman-McCabe Christopher | Chief Reg & Comm Officer | Sell | 5,372 | 93.59 | 502,746 |
| Aug 25, 2026 | Guttman-McCabe Christopher | Chief Reg & Comm Officer | Other | 16,561 | 90.38 | 1,496,783 |
| Aug 25, 2026 | Guttman-McCabe Christopher | Chief Reg & Comm Officer | Other | 40,000 | 34.72 | 1,388,800 |
| Aug 24, 2026 | Kuhn Thomas R. | Director | Sell | 400 | 91.01 | 36,404 |
| Aug 24, 2026 | Kuhn Thomas R. | Director | Sell | 790 | 90.00 | 71,101 |
| Aug 24, 2026 | Kuhn Thomas R. | Director | Sell | 4,418 | 89.12 | 393,726 |
| Aug 24, 2026 | Kuhn Thomas R. | Director | Sell | 4,392 | 88.18 | 387,295 |
| Aug 24, 2026 | Kuhn Thomas R. | Director | Other | 10,000 | 33.62 | 336,200 |
| Aug 19, 2026 | Heard William | Director | Other | 5,400 | 0.00 | – |
| Aug 14, 2026 | Heard William | Director | Sell | 46,400 | 90.11 | 4,181,095 |
| Aug 14, 2026 | Lang Scott A. | President and CEO | Sell | 5,373 | 88.96 | 478,006 |
| Aug 14, 2026 | Lang Scott A. | President and CEO | Sell | 18,797 | 90.16 | 1,694,773 |
| Aug 14, 2026 | Lang Scott A. | President and CEO | Sell | 10,087 | 90.87 | 916,603 |
| Aug 14, 2026 | Lang Scott A. | President and CEO | Sell | 800 | 91.69 | 73,352 |
| Aug 4, 2026 | Fleischhauer Mark | Director | Other | 1,598 | 0.00 | – |
| Aug 4, 2026 | Heard William | Director | Other | 1,598 | 0.00 | – |
| Aug 4, 2026 | Yazdi Mahvash | Director | Other | 1,598 | 0.00 | – |
| Aug 4, 2026 | Daniels Leslie B | Director | Other | 1,598 | 0.00 | – |
| Aug 4, 2026 | Altman Jeffrey A | Director | Other | 1,598 | 0.00 | – |
| Jul 13, 2026 | Marquez Elena | Chief Financial Officer | Other | 231 | 100.96 | 23,322 |
| Jul 13, 2026 | Guttman-McCabe Christopher | Chief Reg & Comm Officer | Other | 1,516 | 100.96 | 153,055 |
| Jun 18, 2026 | Kuhn Thomas R. | Director | Sell | 1,654 | 79.52 | 131,526 |
| May 20, 2026 | Kuhn Thomas R. | Director | Other | 2,791 | – | – |
| Dec 29, 2025 | Heard William | Director | Other | 1,887 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.