ATEX
Anterix Inc. · Communication Services · Telecommunications Services
Momentum inputs (comparable managers):
holder breadth -12.5% ·
share flow +30.0% ·
net new positions -14.3%
· formula
Concentrated accumulation: rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 71 | +19 | 5.99M | $615.39M | +20 | −1 |
| Q1 2026 | 54 | -2 | 5.69M | $217.28M | +5 | −7 |
| Q4 2025 | 56 | 0 | 6.02M | $131.47M | +1 | −1 |
| Q3 2025 | 14 | +1 | 4.16M | $89.22M | +1 | n/a |
| Q2 2025 | 10 | -1 | 4.26M | $109.24M | n/a | −1 |
| Q1 2025 | 8 | -1 | 1.63M | $59.82M | n/a | −1 |
| Q4 2024 | 9 | +1 | 1.39M | $42.60M | +1 | n/a |
| Q3 2024 | 7 | -1 | 1.10M | $41.51M | n/a | −1 |
| Q2 2024 | 8 | n/a | 837.23K | $33.15M | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Geode Capital Management ✦ (passive) | 355.48K | -2.3% | $13.39M | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 2 | D. E. Shaw & Co. ✦ | 275.86K | +254.2% | $10.39M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 3 | Citadel Advisors ✦ | 199.61K | +19.2% | $7.52M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 4 | GAMCO Investors ✦ | 101.77K | -6.9% | $3.83M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 5 | Marshall Wace ✦ | 95.29K | +62.5% | $3.59M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 6 | Millennium Management ✦ | 64.31K | +310.3% | $2.42M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 7 | AQR Capital Management ✦ | 9.84K | -8.8% | $370,424 | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| No new tracked buyers this quarter. |
Exited
| Renaissance Technologies | $1.33M | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 131 holders, 16.93M shares, $637.88M reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold: shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Officer · 400 sh · $32,720
Officer · 3.25K sh · $260,849
Officer · 210 sh · $17,199
Officer · 1.02K sh · $81,589
Officer · 100 sh · $8,250
Officer, Director · 15.00K sh · $1.20M
Director · 2.50K sh · $209,575
Officer · 8.06K sh · $678,998
Officer · 4.06K sh · $347,228
Officer · 293 sh · $25,034
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
27.7% of class · View original SEC filing ↗