Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ATEX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Owl Creek Asset Management, L.P. | 5.4M | $206.7M | 0.0% | 28.889% | 38.25% |
| 2 | Heard Capital LLC | 1.7M | $65.6M | 0.0% | 9.164% | 3.39% |
| 3 | BlackRock, Inc. | 1.0M | $38.5M | -1.1% | 5.376% | 0.00% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 574K | $21.9M | β | 3.063% | 0.00% |
| 5 | QVT Financial LP | 504K | $19.2M | 0.0% | 2.690% | 1.44% |
| 6 | PLUSTICK MANAGEMENT LLC | 500K | $19.1M | β | 2.667% | 9.21% |
| 7 | GAMCO INVESTORS, INC. ET AL | 426K | $16.3M | +0.8% | 2.273% | 0.16% |
| 8 | DIMENSIONAL FUND ADVISORS LP | 425K | $16.2M | +30.8% | 2.268% | 0.00% |
| 9 | STATE STREET CORP | 388K | $14.8M | +16.2% | 2.071% | 0.00% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 374K | $14.3M | +3.9% | 1.998% | 0.00% |
| 11 | GARNET EQUITY CAPITAL HOLDINGS, INC. | 343K | $13.1M | -13.6% | 1.834% | 7.08% |
| 12 | MILLENNIUM MANAGEMENT LLC | 308K | $11.8M | -30.0% | 1.644% | 0.01% |
| 13 | GRATIA CAPITAL, LLC | 288K | $11.0M | β | 1.535% | 6.76% |
| 14 | GABELLI FUNDS LLC | 266K | $10.2M | -12.8% | 1.419% | 0.07% |
| 15 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 247K | $9.4M | +174.0% | 1.320% | 0.00% |
| 16 | Potrero Capital Research LLC | 230K | $8.8M | β | 1.225% | 5.38% |
| 17 | CITADEL ADVISORS LLC | 225K | $8.6M | +86.6% | 1.199% | 0.00% |
| 18 | AYAL Capital Advisors Ltd | 197K | $7.5M | -25.6% | 1.052% | 4.57% |
| 19 | Potomac Capital Management, Inc. | 181K | $6.9M | -3.5% | 0.968% | 6.03% |
| 20 | DG Capital Management, LLC | 168K | $6.4M | +691.8% | 0.898% | 2.04% |
| 21 | BANK OF AMERICA CORP /DE/ | 168K | $6.4M | +17.2% | 0.896% | 0.00% |
| 22 | VANGUARD PORTFOLIO MANAGEMENT LLC | 165K | $6.3M | β | 0.878% | 0.00% |
| 23 | GOLDMAN SACHS GROUP INC | 162K | $6.2M | +29.8% | 0.864% | 0.00% |
| 24 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 141K | $5.4M | +1.9% | 0.755% | 0.00% |
| 25 | FMR LLC | 135K | $5.2M | +165.1% | 0.722% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in ATEX β a direct measure of their conviction.
Filings activity in ATEX during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 129 | +12% | 41.46% | +18.71 pp | $641M | +82% |
| Q4 2025 | 115 | +5.5% | 22.75% | 1.62 pp | $352M | 6.6% |
| Q3 2025 | 109 | 0.9% | 24.37% | 3.65 pp | $377M | 13% |
| Q2 2025 | 110 | 13% | 28.02% | 9.98 pp | $433M | 26% |
| Q1 2025 | 126 | +12% | 38.00% | +8.06 pp | $587M | +27% |
| Q4 2024 | 113 | 12% | 29.94% | 6.37 pp | $463M | 18% |
| Q3 2024 | 129 | +14% | 36.31% | +0.53 pp | $561M | +1.5% |
| Q2 2024 | 113 | β | 35.78% | β | $553M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ATEX stock.
Based on Q1 2026 13F filings, institutional ownership of Anterix Inc. stands at 41.5%, held across 129 reporting institutions.
Owl Creek Asset Management, L.P. is the largest reported institutional holder of ATEX, with approximately 5,411,776 shares worth $0.21B as of Q1 2026.
Yes β 3 widely-followed marquee investors appear among the top 25 institutional holders of ATEX, including MILLENNIUM MANAGEMENT LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP, CITADEL ADVISORS LLC.
Our composite Smart Money Score for ATEX is 74 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
38 institutions opened new positions in ATEX during Q1 2026, while 24 fully exited. 85 added to existing positions and 6 trimmed.
ATEX institutional ownership rose by 18.71 percentage points quarter-over-quarter, with a net change of +14 holders.
The top 10 institutions account for 67.5% of all reported 13F value in ATEX, and the top 25 account for 86.7%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Anterix Inc. (ATEX) Institutional Ownership