ATEN
A10 Networks, Inc. · Technology · Software - Infrastructure
Momentum inputs (comparable managers):
holder breadth +5.9% ·
share flow +1.3% ·
net new positions +5.6%
· formula
Broad accumulation: rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 110 | +13 | 56.91M | $2.09B | +19 | −6 |
| 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 | n/a |
| Q1 2025 | 14 | -1 | 13.16M | $215.02M | n/a | −1 |
| Q4 2024 | 15 | +3 | 11.15M | $205.16M | +3 | n/a |
| Q3 2024 | 11 | 0 | 6.53M | $94.30M | +1 | −1 |
| Q2 2024 | 11 | n/a | 7.34M | $101.70M | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 13.23M | n/a | $255.99M | 0.0% | n/c | 1 | SEC ↗ ×16 |
| 2 | The Vanguard Group ✦ (passive) | 7.33M | n/a | $141.79M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 3 | State Street Global Advisors ✦ (passive) | 3.32M | -0.6% | $64.29M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 4 | Renaissance Technologies ✦ | 2.50M | +6.1% | $48.37M | 0.1% | ▲ Add | 5 | SEC ↗ |
| 5 | Geode Capital Management ✦ (passive) | 1.78M | +3.0% | $34.52M | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
| 6 | T. Rowe Price ✦ | 1.50M | -0.8% | $29.12M | 0.0% | ▼ Trim | 5 | SEC ↗ ×2 |
| 7 | Wellington Management ✦ | 1.47M | +29.7% | $28.35M | 0.0% | ▲ Add | 3 | SEC ↗ ×5 |
| 8 | Arrowstreet Capital ✦ | 1.31M | +39.2% | $25.28M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 9 | Marshall Wace ✦ | 617.67K | +5.5% | $11.95M | 0.0% | ▲ Add | 5 | SEC ↗ ×3 |
| 10 | Two Sigma Investments ✦ | 573.16K | +16.6% | $11.09M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 11 | Citadel Advisors ✦ | 220.59K | -43.3% | $4.27M | 0.0% | ▼ Trim | 5 | SEC ↗ ×2 |
| 12 | Millennium Management ✦ | 93.13K | +51.2% | $1.80M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 13 | Fisher Asset Management ✦ | 74.94K | 0.0% | $1.45M | 0.0% | Held | 5 | SEC ↗ |
| 14 | GAMCO Investors ✦ | 44.00K | 0.0% | $851,400 | 0.0% | Held | 5 | SEC ↗ |
| 15 | AQR Capital Management ✦ | 42.08K | -46.5% | $814,267 | 0.0% | ▼ Trim | 5 | SEC ↗ ×4 |
| 16 | Norges Bank ✦ (passive) | 26.27K | -93.7% | $508,363 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 17 | D. E. Shaw & Co. ✦ | 21.34K | New | $412,929 | 0.0% | New | 1 | SEC ↗ |
| 18 | Fidelity (FMR) ✦ | 8.63K | n/a | $167,018 | 0.0% | n/c | 1 | SEC ↗ ×3 |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| D. E. Shaw & Co. | $412,929 | 0.0% |
Exited
| No tracked exits this quarter. |
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