Latest Period
Q1 2026
Security Snapshot
Anterix Inc. - Common Stock (ATEX) Institutional Ownership
CUSIP: 03676C100
13F Institutional Holders and Ownership History from Q2 2019 to Q1 2026
Institutions Reporting
132
Shares (Excl. Options)
16,932,895
Price
$38.19
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- Security type / class
- Equity / Common Stock
- Symbol
- ATEX on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 16,932,895
- Total 13F value
- $646,462,273
- Portfolio coverage rank
- 0.01%
- Share change
- +838,867
- Value change
- +$54,590,349
- Number of holders
- 132
- Shares outstanding
- 18,768,052
- SEC-reported price per share
- $55.92
- Insider filing price
- $55.92
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ATEX - Anterix Inc. - Common Stock is tracked under CUSIP 03676C100.
- 132 institutions reported positions in Q1 2026.
- 4 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 117 to 132 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $353,310,451 to $646,462,273.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 132 institutions filings for Q1 2026.
Security key
03676C100
Latest holder period
Q1 2026
13F holders
132
13D/G owners
4
CIK / CUSIP context first
Open Q1 2026 holders
ATEX full holder history
Anterix Inc. SEC filings
Anterix Inc. company facts
Anterix Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 03676C100:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
4
Security
ATEX
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Heard Capital LLC | 9.4% | $51,528,035 | 1,741,989 | Heard Capital LLC | 28 Feb 2025 | |||
| BlackRock, Inc. | 5% | -2.4% | $35,694,245 | -$618,411 | 934,649 | -1.7% | BlackRock, Inc. | 31 Mar 2026 |
| VANGUARD GROUP INC | 5% | $20,330,854 | 931,305 | The Vanguard Group | 31 Dec 2025 | |||
| DG Capital Management, LLC | 4% | -24% | $15,985,360 | -$4,963,757 | 744,544 | -24% | DG Capital Management, LLC | 30 Sep 2025 |
As of 31 Mar 2026, 132 institutional investors reported holding 16,932,895 shares of Anterix Inc. - Common Stock (ATEX). This represents 90% of the company’s total 18,768,052 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
77%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Owl Creek Asset Management, L.P. | 29% | 5,411,776 | 0% | 40% | $206,675,725 |
| Heard Capital LLC | 9.1% | 1,716,738 | 0% | 3.4% | $65,562,224 |
| BlackRock, Inc. | 5.4% | 1,007,143 | -1.1% | 0% | $38,462,810 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.1% | 573,847 | 0% | 0% | $21,915,217 |
| QVT Financial LP | 2.7% | 503,941 | 0% | 1.5% | $19,245,507 |
| PLUSTICK MANAGEMENT LLC | 2.7% | 499,596 | 9.2% | $19,079,571 | |
| GAMCO INVESTORS, INC. ET AL | 2.3% | 425,820 | +0.79% | 0.16% | $16,262,066 |
| DIMENSIONAL FUND ADVISORS LP | 2.3% | 424,856 | +31% | 0% | $16,222,641 |
| JANE STREET GROUP, LLC | 2.2% | 420,857 | +165% | 0.02% | $16,072,529 |
| STATE STREET CORP | 2.1% | 387,918 | +16% | 0% | $14,814,588 |
| GEODE CAPITAL MANAGEMENT, LLC | 2% | 374,301 | +3.9% | 0% | $14,299,259 |
| GARNET EQUITY CAPITAL HOLDINGS, INC. | 1.8% | 343,496 | -14% | 7.5% | $13,118,112 |
| MILLENNIUM MANAGEMENT LLC | 1.6% | 307,922 | -30% | 0.01% | $11,759,541 |
| GABELLI FUNDS LLC | 1.4% | 265,800 | -13% | 0.07% | $10,150,902 |
| Potrero Capital Research LLC | 1.2% | 229,561 | 5.4% | $8,766,935 | |
| AYAL Capital Advisors Ltd | 1.1% | 197,119 | -26% | 3.9% | $7,527,975 |
| HRT FINANCIAL LP | 0.93% | 174,925 | +306% | 0.02% | $6,680,000 |
| Potomac Capital Management, Inc. | 0.93% | 173,802 | +7.7% | 5.8% | $6,637,498 |
| DG Capital Management, LLC | 0.9% | 168,217 | +692% | 2.8% | $6,424,207 |
| BANK OF AMERICA CORP /DE/ | 0.89% | 167,781 | +17% | 0% | $6,407,556 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0.88% | 164,542 | 0% | 0% | $6,283,859 |
| GOLDMAN SACHS GROUP INC | 0.86% | 161,786 | +30% | 0% | $6,178,607 |
| CITADEL ADVISORS LLC | 0.86% | 161,163 | +49% | 0% | $6,154,815 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.75% | 141,388 | +2% | 0% | $5,399,608 |
| FMR LLC | 0.72% | 135,295 | +165% | 0% | $5,166,931 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
28
Latest
Q1 2026
Rows shown
1-25 of 28
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 16,932,895 | $646,462,273 | +$54,590,349 | $38.19 | 132 |
| 2025 Q4 | 16,180,545 | $353,310,451 | -$761,149 | $21.83 | 117 |
| 2025 Q3 | 15,892,445 | $341,210,062 | -$21,494,095 | $21.47 | 110 |
| 2025 Q2 | 16,798,194 | $430,873,693 | +$5,778,849 | $25.65 | 109 |
| 2025 Q1 | 16,354,227 | $598,597,088 | +$24,643,665 | $36.60 | 128 |
| 2024 Q4 | 15,990,167 | $490,412,835 | +$4,179,537 | $30.67 | 113 |
| 2024 Q3 | 15,762,630 | $593,586,930 | +$33,544,074 | $37.66 | 127 |
| 2024 Q2 | 14,976,662 | $592,922,823 | +$12,607,148 | $39.59 | 112 |
| 2024 Q1 | 14,671,486 | $493,164,901 | -$3,442,304 | $33.61 | 97 |
| 2023 Q4 | 14,774,749 | $492,294,457 | -$2,514,906 | $33.32 | 91 |
| 2023 Q3 | 14,875,879 | $466,805,252 | -$14,453,049 | $31.38 | 96 |
| 2023 Q2 | 15,334,359 | $485,963,452 | -$3,134,853 | $31.69 | 93 |
| 2023 Q1 | 15,429,877 | $509,799,258 | -$1,255,532 | $33.04 | 86 |
| 2022 Q4 | 15,489,687 | $498,309,599 | -$9,985,557 | $32.17 | 91 |
| 2022 Q3 | 15,717,231 | $561,424,047 | +$25,584,069 | $35.72 | 96 |
| 2022 Q2 | 14,954,246 | $614,165,320 | -$5,584,480 | $41.07 | 90 |
| 2022 Q1 | 15,103,375 | $874,447,504 | -$6,381,270 | $57.90 | 105 |
| 2021 Q4 | 15,187,749 | $892,021,662 | -$15,273,036 | $58.76 | 102 |
| 2021 Q3 | 15,139,014 | $918,125,236 | -$783,490 | $60.70 | 105 |
| 2021 Q2 | 15,202,979 | $912,028,428 | -$9,533,969 | $59.99 | 106 |
| 2021 Q1 | 15,500,931 | $731,032,284 | +$49,980,240 | $47.16 | 96 |
| 2020 Q4 | 16,188,659 | $608,687,656 | +$12,279,881 | $37.60 | 86 |
| 2020 Q3 | 15,950,453 | $521,738,240 | -$14,474,223 | $32.71 | 92 |
| 2020 Q2 | 16,236,389 | $736,140,456 | -$10,250,900 | $45.34 | 101 |
| 2020 Q1 | 16,462,443 | $751,832,615 | -$24,859,764 | $45.67 | 80 |