Ranked by reported Q2 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. | 13.6M | $506.9M | +3.7% | 18.846% | 0.01% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.5M | $129.3M | +2.2% | 4.809% | 0.01% |
| 3 | FIRST TRUST ADVISORS LP | 3.2M | $121.2M | +88.7% | 4.507% | 0.07% |
| 4 | STATE STREET CORP | 3.1M | $115.2M | -0.2% | 4.282% | 0.00% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 3.1M | $114.7M | -1.6% | 4.265% | 0.00% |
| 6 | Boston Trust Walden Corp | 2.4M | $90.3M | +11.2% | 3.357% | 0.69% |
| 7 | WELLINGTON MANAGEMENT GROUP LLP | 2.0M | $73.2M | -5.5% | 2.722% | 0.01% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 1.8M | $67.8M | +5.6% | 2.519% | 0.00% |
| 9 | GOLDMAN SACHS GROUP INC | 1.8M | $66.7M | +50.4% | 2.479% | 0.01% |
| 10 | DIMENSIONAL FUND ADVISORS LP | 1.6M | $59.7M | -2.3% | 2.221% | 0.01% |
| 11 | RENAISSANCE TECHNOLOGIES LLC | 1.5M | $56.8M | -14.8% | 2.112% | 0.08% |
| 12 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.4M | $53.7M | -4.0% | 1.997% | 0.02% |
| 13 | FMR LLC | 1.4M | $53.6M | +5001.7% | 1.991% | 0.00% |
| 14 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 1.4M | $53.3M | -8.3% | 1.982% | 0.06% |
| 15 | Invesco Ltd. | 1.2M | $46.4M | +242.8% | 1.726% | 0.00% |
| 16 | PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. | 1.2M | $44.4M | -18.6% | 1.651% | 2.20% |
| 17 | TWO SIGMA INVESTMENTS, LP | 1.1M | $42.0M | -14.8% | 1.563% | 0.03% |
| 18 | PRUDENTIAL FINANCIAL INC | 1.0M | $39.2M | +18.4% | 1.456% | 0.04% |
| 19 | BARCLAYS PLC | 962K | $36.0M | -48.7% | 1.337% | 0.01% |
| 20 | MORGAN STANLEY | 908K | $33.9M | +11.7% | 1.261% | 0.00% |
| 21 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 897K | $33.5M | — | 1.245% | 0.05% |
| 22 | LOOMIS SAYLES & CO L P | 884K | $33.0M | — | 1.228% | 0.04% |
| 23 | Boston Partners | 802K | $30.0M | -1.6% | 1.115% | 0.03% |
| 24 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 762K | $28.5M | +2.4% | 1.058% | 0.00% |
| 25 | NORTHERN TRUST CORP | 756K | $28.3M | +7.4% | 1.051% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in ATEN — a direct measure of their conviction.
Filings activity in ATEN during Q2 2026, grouped by how each filer changed its position.
Institutions that opened a new ATEN position in Q2 2026
Institutions that fully closed their ATEN position in Q2 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 313 | +19% | 106.97% | +5.30 pp | $2.69B | +74% |
| Q1 2026 | 264 | +10% | 101.67% | +3.07 pp | $1.54B | +37% |
| Q4 2025 | 239 | +2.6% | 98.60% | +0.10 pp | $1.12B | 3.2% |
| Q3 2025 | 233 | +3.1% | 98.50% | +0.34 pp | $1.16B | 3.8% |
| Q2 2025 | 226 | 7.8% | 98.16% | +0.52 pp | $1.21B | +17% |
| Q1 2025 | 245 | +14% | 97.64% | +10.22 pp | $1.03B | 4.0% |
| Q4 2024 | 215 | +4.9% | 87.42% | 0.88 pp | $1.07B | +22% |
| Q3 2024 | 205 | — | 88.30% | — | $874M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ATEN stock.
Based on Q2 2026 13F filings, institutional ownership of A10 Networks, Inc. stands at 107.0%, held across 313 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ATEN, with approximately 13,568,496 shares worth $0.51B as of Q2 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of ATEN, including RENAISSANCE TECHNOLOGIES LLC, TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for ATEN is 77 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
76 institutions opened new positions in ATEN during Q2 2026, while 25 fully exited. 205 added to existing positions and 26 trimmed.
ATEN institutional ownership rose by 5.30 percentage points quarter-over-quarter, with a net change of +49 holders.
The top 10 institutions account for 50.0% of all reported 13F value in ATEN, and the top 25 account for 72.8%.
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