Comparable stake leader
Owl Creek Asset Management, L.P.
SEC ownership of Anterix Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001304492.
Disclosed value leader
Owl Creek Asset Management, L.P.
Comparable rows
50/50
Latest evidence
19 Aug 2026
- Public ticker
- ATEX on Nasdaq
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Owl Creek Asset Management, L.P.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Owl Creek Asset Management, L.P.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
19 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001304492
- Issuer location
- Woodland Park, NJ
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Anterix Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Owl Creek Asset Managemen...
Disclosed value leader
Owl Creek Asset Managemen...
Comparable rows
50/50
Latest evidence
19 Aug 2026
13D/G
3/4/5
13F
Lead comparable stake: 28%
13D/G row: Owl Creek Asset Management, L.P.
Showing 1-8 of 50 holder rows.
Quick read
Owl Creek Asset Management, L.P. leads the comparable SEC ownership view at 28%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Owl Creek Asset Management, L.P.'s linked filing trail.
Comparable ownership
Top 5
Owl Creek Asset Management, L.P.
28%
T. Rowe Price Investment Manageme...
12%
Heard Capital LLC
9.4%
BlackRock, Inc.
5.1%
VANGUARD GROUP INC
5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Owl Creek Asset Management, L.P. |
13D/G
3/4/5
13F
Jeffrey A. Altman · 10%+ Owner · Company
|
28%
|
$571,490,906
5,551,684 shares
|
$0 | 25 Jun 2026 |
| T. Rowe Price Investment Management, Inc. |
13F
13D/G
Company
|
12%
from 13D/G
|
$241,706,000
2,348,019 shares
|
— | 30 Jun 2026 |
| Heard Capital LLC |
13F
13D/G
Company
|
9.4%
from 13D/G
|
$176,721,010
1,716,738 shares
|
— | 30 Jun 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
5.1%
from 13D/G
|
$110,672,390
1,075,115 shares
|
— | 30 Jun 2026 |
| VANGUARD GROUP INC |
13D/G
The Vanguard Group
|
5%
|
$20,330,854
931,305 shares
|
$0 | 31 Dec 2025 |
| DG Capital Management, LLC |
13D/G
|
4%
|
$15,985,360
744,544 shares
|
-$4,963,757 | 30 Sep 2025 |
| Jeffrey A. Altman |
3/4/5
Director, 10%+ Owner
|
28%
|
$558,839,642
5,428,790 shares
|
— | 04 Aug 2026 |
| William Heard |
3/4/5
Director
|
8.5%
|
$172,352,750
1,674,303 shares
|
-$4,181,095 | 19 Aug 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$19,985,081.
Buys
$174,024
Insiders: 1
Sells
$20,159,105
Insiders: 7
Net
-$19,985,081
Shares: -235,285
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 8,260
Shares: 243,545
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 236,981 | $0 | $20,020,802 | -$20,020,802 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 3,610 | 0 | $75,072 | $0 | +$75,072 |
| 9-12 | 4,650 | 6,564 | $98,952 | $138,303 | -$39,351 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 23 reporting-owner rows connected to Anterix Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
23
Largest Forms 3/4/5 holder
Jeffrey A. Altman
Net 12M change
-$19,985,082
Latest report
19 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Jeffrey A. Altman | Director, 10%+ Owner | $558,839,642 | Median | 04 Aug 2026 | ||
| Owl Creek Asset Management, L.P. | 10%+ Owner | $558,839,642 | Median | 04 Aug 2026 | ||
| William Heard | Director | $172,352,750 | -$4,181,095 | -2.4% | Median | 19 Aug 2026 |
| Christopher Guttman-McCabe | Chief Reg & Comm Officer | $13,090,570 | -$10,042,744 | -43% | Mixed | 13 Jul 2026 |
| Leslie B. Daniels | Director | $6,493,146 | Median | 04 Aug 2026 | ||
| Robert Harris Schwartz | President and CEO, Director | $4,349,647 | Mixed | 23 Aug 2024 | ||
| Scott A. Lang | President and CEO, Director | $3,689,357 | -$3,002,353 | -45% | Filing P/S | 14 Aug 2026 |
| Mahvash Yazdi | Director | $2,265,194 | -$560,000 | -20% | Median | 04 Aug 2026 |
| Elena Marquez | Chief Financial Officer | $1,868,978 | -$341,135 | -15% | Median | 13 Jul 2026 |
| Timothy Gray | Chief Financial Officer | $1,699,875 | Filing P/S | 19 Aug 2025 | ||
| Mark Fleischhauer | Director | $1,478,938 | -$279,403 | -16% | Median | 04 Aug 2026 |
| Heather Martin | Chief Marketing Officer, Chief of Staff | $1,461,607 | Mixed | 20 May 2026 | ||
| Elaine Gangeri | Chief Acc Officer, Treasurer | $1,245,598 | Mixed | 24 May 2021 | ||
| Ryan Gerbrandt | Chief Operating Officer | $1,014,569 | Mixed | 12 Jul 2025 | ||
| Paul N. Saleh | Director | $821,708 | Mixed | 28 Aug 2023 | ||
| Morgan E. Obrien | Executive Chairman, Director | $801,657 | Filing P/S | 16 Dec 2024 | ||
| Gena L. Ashe | Chief Legal Officer & Corp Sec | $782,876 | -$1,578,352 | -67% | Filing P/S | 15 Jun 2026 |
| Singleton B. Mcallister | Director | $734,150 | Mixed | 28 Aug 2023 | ||
| Greg Haller | Director | $591,902 | Mixed | 28 Aug 2023 | ||
| Gregory A. Pratt | Director | $473,787 | Mixed | 28 Aug 2023 |
Recent insider transactions for Anterix Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| William Heard | ATEX | Common Stock, par value $0.0001 per share ("Common Stock") | Gift | -57.7% | -5,400 | 3,965 | 19 Aug 2026 | Direct | ||
| William Heard | ATEX | Common Stock | Sale | -2.7% | $4,181,095 | $90.11 | -46,400 | 1,670,338 | 14 Aug 2026 | By Heard Capital LLC |
| Scott A. Lang | ATEX | Common Stock | Sale | -45.8% | $3,162,734 | $90.22 | -35,057 | 41,470 | 14 Aug 2026 | Direct |
| William Heard | ATEX | Common Stock, par value $0.0001 per share ("Common Stock") | Award | 16.6% | 1,598 | 11,252 | 04 Aug 2026 | Direct | ||
| Altman Jeffrey A | ATEX | Common Stock, par value $0.0001 per share ("Common Stock") | Award | 10.4% | 1,598 | 17,014 | 04 Aug 2026 | Direct | ||
| Jeffrey A. Altman | ATEX | Common Stock, par value $0.0001 per share ("Common Stock") | Award | 10.4% | 1,598 | 17,014 | 04 Aug 2026 | Direct | ||
| Mahvash Yazdi | ATEX | Common Stock | Award | 8.23% | 1,598 | 21,005 | 04 Aug 2026 | Direct | ||
| Mark Fleischhauer | ATEX | Common Stock | Award | 12.5% | 1,598 | 14,367 | 04 Aug 2026 | Direct | ||
| Leslie B. Daniels | ATEX | Common Stock | Award | 2.93% | 1,598 | 56,077 | 04 Aug 2026 | Direct | ||
| Elena Marquez | ATEX | Common Stock | Tax liability | -1.26% | -231 | 18,156 | 13 Jul 2026 | Direct | ||
| Christopher Guttman-McCabe | ATEX | Common Stock | Tax liability | -1.95% | -1,516 | 76,291 | 13 Jul 2026 | Direct | ||
| Scott A. Lang | ATEX | Common Stock | Sale | -0.22% | $13,642 | $80.25 | -170 | 76,527 | 18 Jun 2026 | Direct |
| Elena Marquez | ATEX | Common Stock | Sale | -18.9% | $341,134 | $79.50 | -4,291 | 18,387 | 17 Jun 2026 | Direct |
| Elena Marquez | ATEX | Common Stock | Options Exercise | 5.72% | 1,226 | 22,678 | 17 Jun 2026 | Direct | ||
| Elena Marquez | ATEX | Stock Option (Right to Buy) | Options Exercise | -33.3% | -1,226 | 2,454 | 17 Jun 2026 | Direct | ||
| Mahvash Yazdi | ATEX | Common Stock | Sale | -26.5% | $560,000 | $80.00 | -7,000 | 19,407 | 16 Jun 2026 | Direct |
| Christopher Guttman-McCabe | ATEX | Common Stock | Sale | -72.6% | $10,042,744 | $81.75 | -122,852 | 46,392 | 15 Jun 2026 | Direct |
| Gena L. Ashe | ATEX | Common Stock | Sale | -65% | $1,440,049 | $81.31 | -17,711 | 9,531 | 15 Jun 2026 | Direct |
| Gena L. Ashe | ATEX | Common Stock | Tax liability | -36.5% | -15,657 | 27,242 | 15 Jun 2026 | Direct | ||
| Gena L. Ashe | ATEX | Common Stock | Options Exercise | 217% | 29,368 | 42,899 | 15 Jun 2026 | Direct | ||
| Gena L. Ashe | ATEX | Stock Option (Right to Buy) | Options Exercise | -100% | -29,368 | 0 | 15 Jun 2026 | Direct | ||
| Scott A. Lang | ATEX | Common Stock | Tax liability | -53.5% | -88,091 | 76,697 | 15 Jun 2026 | Direct | ||
| Scott A. Lang | ATEX | Common Stock | Options Exercise | 522.6% | 138,318 | 164,788 | 15 Jun 2026 | Direct | ||
| Scott A. Lang | ATEX | Stock Option (Right to Buy) | Options Exercise | -52% | -138,318 | 127,538 | 15 Jun 2026 | Direct | ||
| Mark Fleischhauer | ATEX | Common Stock | Sale | -21.5% | $279,403 | $79.83 | -3,500 | 12,769 | 15 Jun 2026 | Direct |
| Gena L. Ashe | ATEX | Common Stock | Tax liability | -15.6% | -2,501 | 13,531 | 22 May 2026 | Direct | ||
| Scott A. Lang | ATEX | Common Stock | Award | 220.5% | 18,210 | 26,470 | 20 May 2026 | Direct | ||
| Scott A. Lang | ATEX | Stock Option (Right to Buy) | Award | 72,839 | 72,839 | 20 May 2026 | Direct | |||
| Gena L. Ashe | ATEX | Common Stock | Award | 29.9% | 3,694 | 16,032 | 20 May 2026 | Direct | ||
| Gena L. Ashe | ATEX | Stock Option (Right to Buy) | Award | 17,453 | 17,453 | 20 May 2026 | Direct | |||
| Christopher Guttman-McCabe | ATEX | Common Stock | Award | 11.9% | 4,926 | 46,392 | 20 May 2026 | Direct | ||
| Christopher Guttman-McCabe | ATEX | Stock Option (Right to Buy) | Award | 23,271 | 23,271 | 20 May 2026 | Direct | |||
| Elena Marquez | ATEX | Common Stock | Award | 20.8% | 3,694 | 21,452 | 20 May 2026 | Direct | ||
| Elena Marquez | ATEX | Stock Option (Right to Buy) | Award | 17,453 | 17,453 | 20 May 2026 | Direct | |||
| Heather Martin | ATEX | Common Stock | Award | 10.7% | 3,694 | 38,272 | 20 May 2026 | Direct | ||
| Heather Martin | ATEX | Stock Option (Right to Buy) | Award | 17,453 | 17,453 | 20 May 2026 | Direct | |||
| Gena L. Ashe | ATEX | Common Stock | Tax liability | -7.69% | -1,028 | 12,338 | 18 May 2026 | Direct | ||
| Christopher Guttman-McCabe | ATEX | Common Stock | Tax liability | -3.32% | -1,426 | 41,466 | 18 May 2026 | Direct | ||
| Elena Marquez | ATEX | Common Stock | Tax liability | -1.5% | -271 | 17,758 | 15 May 2026 | Direct | ||
| Gena L. Ashe | ATEX | Common Stock | Tax liability | -48.2% | -12,427 | 13,366 | 03 Mar 2026 | Direct | ||
| Gena L. Ashe | ATEX | Common Stock | Options Exercise | 93% | 12,427 | 25,793 | 03 Mar 2026 | Direct | ||
| Gena L. Ashe | ATEX | Stock Option (Right to Buy) | Options Exercise | -33.3% | -12,427 | 24,848 | 03 Mar 2026 | Direct | ||
| William Heard | ATEX | Common Stock, par value $0.0001 per share ("Common Stock") | Gift | -16.8% | -1,887 | 9,365 | 29 Dec 2025 | Direct | ||
| Scott A. Lang | ATEX | Common Stock | Purchase | 16.3% | $25,068 | $21.61 | 1,160 | 8,260 | 18 Dec 2025 | Direct |
| Scott A. Lang | ATEX | Common Stock | Purchase | 52.7% | $50,004 | $20.41 | 2,450 | 7,100 | 08 Dec 2025 | Direct |
| Gena L. Ashe | ATEX | Common Stock | Sale | -32.9% | $138,303 | $21.07 | -6,564 | 13,366 | 18 Nov 2025 | Direct |
| Elena Marquez | ATEX | Common Stock | Tax liability | -2.19% | -404 | 18,029 | 04 Oct 2025 | Direct | ||
| Elena Marquez | ATEX | Common Stock | Award | 162.3% | 11,405 | 18,433 | 29 Sep 2025 | Direct | ||
| Scott A. Lang | ATEX | Common Stock | Purchase | $98,952 | $21.28 | 4,650 | 4,650 | 18 Sep 2025 | Direct |
* marks a reported price that did not pass the local price check.