ATEN
A10 Networks, Inc. · Technology · Software - Infrastructure
Momentum inputs (comparable managers):
holder breadth -6.7% ·
share flow +18.0% ·
net new positions -7.1%
— formula
Concentrated accumulation — rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 111 | +13 | 56.93M | $2.09B | +19 | −5 |
| Q1 2026 | 100 | +6 | 51.94M | $1.20B | +8 | −3 |
| Q4 2025 | 95 | -2 | 53.78M | $951.26M | +1 | −2 |
| Q3 2025 | 21 | +1 | 36.30M | $658.81M | +1 | −1 |
| Q2 2025 | 18 | +1 | 34.16M | $661.04M | +1 | — |
| Q1 2025 | 14 | -1 | 13.16M | $215.02M | — | −1 |
| Q4 2024 | 15 | +3 | 11.15M | $205.16M | +3 | — |
| Q3 2024 | 11 | 0 | 6.53M | $94.30M | +1 | −1 |
| Q2 2024 | 11 | — | 7.34M | $101.70M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | State Street Global Advisors ✦ (passive) | 3.34M | +0.4% | $54.62M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 2 | Renaissance Technologies ✦ | 2.36M | +21.9% | $38.50M | 0.1% | ▲ Add | 4 | SEC ↗ |
| 3 | Geode Capital Management ✦ (passive) | 1.73M | +3.3% | $28.31M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 4 | Geode Capital Management ✦ (passive) | 1.73M | +3.3% | $28.31M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 5 | T. Rowe Price ✦ | 1.52M | +3.3% | $24.79M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 6 | T. Rowe Price ✦ | 1.52M | +3.3% | $24.79M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 7 | Wellington Management ✦ | 1.13M | +390.9% | $18.47M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 8 | Wellington Management ✦ | 1.13M | +390.9% | $18.47M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 9 | Wellington Management ✦ | 1.13M | +390.9% | $18.47M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 10 | Wellington Management ✦ | 1.13M | +390.9% | $18.47M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 11 | Wellington Management ✦ | 1.13M | +390.9% | $18.47M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 12 | Arrowstreet Capital ✦ | 938.76K | +280.1% | $15.34M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 13 | Marshall Wace ✦ | 585.41K | -14.4% | $9.57M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 14 | Marshall Wace ✦ | 585.41K | -14.4% | $9.57M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 15 | Two Sigma Investments ✦ | 491.58K | +114.1% | $8.03M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 16 | Norges Bank ✦ (passive) | 416.67K | +6.5% | $6.81M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 17 | Citadel Advisors ✦ | 388.90K | +0.2% | $6.35M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 18 | Citadel Advisors ✦ | 388.90K | +0.2% | $6.35M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 19 | AQR Capital Management ✦ | 78.70K | -41.6% | $1.29M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 20 | AQR Capital Management ✦ | 78.70K | -41.6% | $1.29M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 21 | AQR Capital Management ✦ | 78.70K | -41.6% | $1.29M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 22 | AQR Capital Management ✦ | 78.70K | -41.6% | $1.29M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 23 | AQR Capital Management ✦ | 78.70K | -41.6% | $1.29M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 24 | Fisher Asset Management ✦ | 74.94K | -18.4% | $1.22M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 25 | Millennium Management ✦ | 61.59K | -77.7% | $1.01M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 26 | GAMCO Investors ✦ | 44.00K | 0.0% | $718,960 | 0.0% | Held | 4 | SEC ↗ |
“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
| Point72 Asset Management | $447,807 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 263 holders, 71.95M shares, $1.53B 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)
Director · 2.65K sh · $68,024
Officer · 14.09K sh · $392,436
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology