Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ATEN held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 13.1M | $302.6M | +0.8% | 18.248% | 0.01% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.4M | $78.3M | β | 4.723% | 0.00% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 3.1M | $72.2M | β | 4.351% | 0.00% |
| 4 | STATE STREET CORP | 3.1M | $71.4M | -0.8% | 4.308% | 0.00% |
| 5 | Boston Trust Walden Corp | 2.2M | $50.2M | -11.0% | 3.030% | 0.41% |
| 6 | WELLINGTON MANAGEMENT GROUP LLP | 2.1M | $48.0M | +2.7% | 2.892% | 0.01% |
| 7 | BARCLAYS PLC | 1.9M | $43.3M | +1.8% | 2.613% | 0.02% |
| 8 | RENAISSANCE TECHNOLOGIES LLC | 1.8M | $41.3M | -16.4% | 2.489% | 0.06% |
| 9 | FIRST TRUST ADVISORS LP | 1.7M | $39.8M | -30.2% | 2.398% | 0.03% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 1.7M | $39.7M | -3.4% | 2.395% | 0.00% |
| 11 | DIMENSIONAL FUND ADVISORS LP | 1.6M | $37.8M | -0.8% | 2.281% | 0.01% |
| 12 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 1.6M | $36.0M | +7.4% | 2.170% | 0.05% |
| 13 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.5M | $34.6M | +36.7% | 2.087% | 0.02% |
| 14 | PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. | 1.5M | $33.8M | +1.7% | 2.036% | 1.95% |
| 15 | TWO SIGMA INVESTMENTS, LP | 1.3M | $30.5M | +79.9% | 1.840% | 0.02% |
| 16 | GOLDMAN SACHS GROUP INC | 1.2M | $27.4M | +14.7% | 1.655% | 0.00% |
| 17 | PRUDENTIAL FINANCIAL INC | 885K | $20.5M | +1105.9% | 1.234% | 0.03% |
| 18 | Boston Partners | 816K | $19.0M | -2.9% | 1.137% | 0.02% |
| 19 | ROYCE & ASSOCIATES LP | 817K | $18.9M | +12.4% | 1.140% | 0.19% |
| 20 | MORGAN STANLEY | 813K | $18.8M | +1.1% | 1.134% | 0.00% |
| 21 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 744K | $17.2M | +2.1% | 1.037% | 0.00% |
| 22 | NORTHERN TRUST CORP | 704K | $16.3M | +2.4% | 0.982% | 0.00% |
| 23 | Bank of New York Mellon Corp | 661K | $15.3M | -0.8% | 0.921% | 0.00% |
| 24 | JANE STREET GROUP, LLC | 596K | $13.8M | β | 0.831% | 0.12% |
| 25 | DEPRINCE RACE & ZOLLO INC | 565K | $13.1M | β | 0.787% | 0.25% |
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 ATEN β a direct measure of their conviction.
Filings activity in ATEN 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 | 260 | +8.8% | 67.32% | +18.00 pp | $1.53B | +36% |
| Q4 2025 | 239 | +3.0% | 49.32% | 1.64 pp | $1.12B | 3.2% |
| Q3 2025 | 232 | +2.7% | 50.96% | 2.00 pp | $1.16B | 3.8% |
| Q2 2025 | 226 | 7.8% | 52.96% | +7.84 pp | $1.21B | +17% |
| Q1 2025 | 245 | +14% | 45.12% | 1.86 pp | $1.03B | 4.0% |
| Q4 2024 | 215 | +4.9% | 46.98% | +8.61 pp | $1.07B | +22% |
| Q3 2024 | 205 | 4.2% | 38.37% | +0.51 pp | $874M | +1.3% |
| Q2 2024 | 214 | β | 37.86% | β | $863M | 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 ATEN stock.
Based on Q1 2026 13F filings, institutional ownership of A10 Networks, Inc. stands at 67.3%, held across 260 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ATEN, with approximately 13,088,277 shares worth $0.30B as of Q1 2026.
Yes β 3 widely-followed marquee investors appear among the top 25 institutional holders of ATEN, including RENAISSANCE TECHNOLOGIES LLC, TWO SIGMA INVESTMENTS, LP, JANE STREET GROUP, LLC.
Our composite Smart Money Score for ATEN is 74 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
60 institutions opened new positions in ATEN during Q1 2026, while 39 fully exited. 169 added to existing positions and 30 trimmed.
ATEN institutional ownership rose by 18.00 percentage points quarter-over-quarter, with a net change of +21 holders.
The top 10 institutions account for 51.3% of all reported 13F value in ATEN, and the top 25 account for 74.3%.
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.
A10 Networks, Inc. (ATEN) Institutional Ownership