Who owns A10 Networks (ATEN)
Which tracked institutional funds hold ATEN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ATEN company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on ATEN is one-sided between 2026-Q1 and 2026-Q2: 143 added or opened and 42 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
ATEN’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes ATEN more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in ATEN divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 292 tracked filers holding ATEN, 162 increased or opened the position and 140 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in ATEN between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 32
- NOMURA ASSET MANAGEMENT INTERNATIONAL INC.$33M
- LOOMIS SAYLES & CO L P$33M
- ABSOLUTE INVESTMENT ADVISERS, LLC$19M
- WASATCH ADVISORS LP$16M
- Ceredex Value Advisors LLC$14M
- ENVESTNET ASSET MANAGEMENT INC$9M
Full exits 25
- Penserra Capital Management LLC$83M
- DEPRINCE RACE & ZOLLO INC$13M
- HRT FINANCIAL LP$7M
- Man Group plc$7M
- HARBOR CAPITAL ADVISORS, INC.$4M
- BESSEMER GROUP INC$4M
Largest adds
- BlackRock, Inc.$296M
- FIRST TRUST ADVISORS LP$81M
- FMR LLC$53M
- VANGUARD PORTFOLIO MANAGEMENT LLC$51M
- STATE STREET CORP$44M
- VANGUARD CAPITAL MANAGEMENT LLC$43M
Largest trims
- JANE STREET GROUP, LLC$10M
- BARCLAYS PLC$7M
- CITADEL ADVISORS LLC$7M
- NORGES BANK$6M
- Russell Investments Group, Ltd.$4M
- Qube Research & Technologies Ltd$3M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 13,568,496 | $507M | 19.2% | 2026-Q2 |
| ABSOLUTE INVESTMENT ADVISERS, LLC new | 11,000,000 | $19M | 0.7% | 2026-Q2 |
| PICTON MAHONEY ASSET MANAGEMENT added | 5,000,000 | $9M | 0.3% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 3,462,058 | $129M | 4.9% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 3,244,739 | $121M | 4.6% | 2026-Q2 |
| STATE STREET CORP trimmed | 3,082,631 | $115M | 4.4% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 3,071,071 | $115M | 4.4% | 2026-Q2 |
| Boston Trust Walden Corp added | 2,416,808 | $90M | 3.4% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 1,959,853 | $73M | 2.8% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,813,638 | $68M | 2.6% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 1,784,946 | $67M | 2.5% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,599,129 | $60M | 2.3% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 1,520,287 | $57M | 2.2% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 1,437,650 | $54M | 2.0% | 2026-Q2 |
| FMR LLC added | 1,433,878 | $54M | 2.0% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 1,426,608 | $53M | 2.0% | 2026-Q2 |
| Invesco Ltd. added | 1,243,053 | $46M | 1.8% | 2026-Q2 |
| PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. trimmed | 1,188,747 | $44M | 1.7% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 1,124,963 | $42M | 1.6% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 1,048,320 | $39M | 1.5% | 2026-Q2 |
| BARCLAYS PLC trimmed | 962,382 | $36M | 1.4% | 2026-Q2 |
| MORGAN STANLEY added | 908,083 | $34M | 1.3% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. new | 896,517 | $33M | 1.3% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 894,398 | $33M | 1.3% | 2026-Q2 |
| LOOMIS SAYLES & CO L P new | 884,023 | $33M | 1.3% | 2026-Q2 |
| Boston Partners trimmed | 802,469 | $30M | 1.1% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 761,676 | $28M | 1.1% | 2026-Q2 |
| NORTHERN TRUST CORP added | 756,476 | $28M | 1.1% | 2026-Q2 |
| UBS Group AG added | 736,554 | $28M | 1.0% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 659,883 | $25M | 0.9% | 2026-Q2 |
| ROYCE & ASSOCIATES LP trimmed | 597,646 | $22M | 0.8% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 573,164 | $21M | 0.8% | 2026-Q2 |
| OBERWEIS ASSET MANAGEMENT INC/ added | 552,000 | $21M | 0.8% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 547,577 | $20M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 511,169 | $19M | 0.7% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 463,003 | $17M | 0.7% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 461,387 | $17M | 0.7% | 2026-Q2 |
| Aptus Capital Advisors, LLC added | 457,762 | $17M | 0.6% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 446,423 | $17M | 0.6% | 2026-Q2 |
| WASATCH ADVISORS LP new | 416,114 | $16M | 0.6% | 2026-Q2 |
| Defiance ETFs, LLC trimmed | 412,194 | $16M | 0.6% | 2026-Q2 |
| Impax Asset Management Group plc trimmed | 410,000 | $15M | 0.6% | 2026-Q2 |
| Ceredex Value Advisors LLC new | 387,750 | $14M | 0.6% | 2026-Q2 |
| PARADIGM CAPITAL MANAGEMENT INC/NY trimmed | 384,700 | $14M | 0.5% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN trimmed | 329,534 | $12M | 0.5% | 2026-Q2 |
| Jump Financial, LLC added | 324,417 | $12M | 0.5% | 2026-Q2 |
| Bridge City Capital, LLC trimmed | 296,239 | $11M | 0.4% | 2026-Q2 |
| CRAWFORD INVESTMENT COUNSEL INC trimmed | 295,532 | $11M | 0.4% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 283,306 | $10M | 0.4% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC new | 247,901 | $9M | 0.4% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 247,318 | $9M | 0.4% | 2026-Q2 |
| RICE HALL JAMES & ASSOCIATES, LLC trimmed | 245,117 | $9M | 0.3% | 2026-Q2 |
| Nuveen, LLC added | 236,607 | $9M | 0.3% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 234,381 | $9M | 0.3% | 2026-Q2 |
| Portolan Capital Management, LLC new | 226,920 | $8M | 0.3% | 2026-Q2 |
| PEREGRINE CAPITAL MANAGEMENT LLC trimmed | 201,952 | $8M | 0.3% | 2026-Q2 |
| SUMMIT PARTNERS L P | 200,065 | $7M | 0.3% | 2026-Q2 |
| Legal & General Group Plc trimmed | 189,446 | $7M | 0.3% | 2026-Q2 |
| Informed Momentum Co LLC trimmed | 188,768 | $7M | 0.3% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 178,808 | $7M | 0.3% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 175,579 | $7M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 172,167 | $6M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 168,623 | $6M | 0.2% | 2026-Q2 |
| Uniplan Investment Counsel, Inc. added | 161,381 | $6M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 159,216 | $6M | 0.2% | 2026-Q2 |
| IQ EQ FUND MANAGEMENT (IRELAND) Ltd trimmed | 158,843 | $6M | 0.2% | 2026-Q2 |
| SEI INVESTMENTS CO added | 151,678 | $6M | 0.2% | 2026-Q2 |
| Creative Planning added | 149,624 | $6M | 0.2% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC trimmed | 143,421 | $5M | 0.2% | 2026-Q2 |
| Hennion & Walsh Asset Management, Inc. added | 141,978 | $5M | 0.2% | 2026-Q2 |
| TRUIST FINANCIAL CORP added | 138,302 | $5M | 0.2% | 2026-Q2 |
| CREDIT AGRICOLE S A new | 138,000 | $5M | 0.2% | 2026-Q2 |
| Swiss National Bank trimmed | 136,700 | $5M | 0.2% | 2026-Q2 |
| 4D Advisors, LLC new | 135,000 | $5M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 134,991 | $5M | 0.2% | 2026-Q2 |
| CITIGROUP INC added | 128,365 | $5M | 0.2% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 122,942 | $5M | 0.2% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL trimmed | 120,260 | $4M | 0.2% | 2026-Q2 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM trimmed | 114,819 | $4M | 0.2% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 114,416 | $4M | 0.2% | 2026-Q2 |
| PDT Partners, LLC added | 111,226 | $4M | 0.2% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 104,707 | $4M | 0.1% | 2026-Q2 |
| Brevan Howard Capital Management LP added | 102,085 | $4M | 0.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 99,729 | $4M | 0.1% | 2026-Q2 |
| HSBC HOLDINGS PLC trimmed | 94,437 | $4M | 0.1% | 2026-Q2 |
| JANE STREET GROUP, LLC trimmed | 93,880 | $4M | 0.1% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 93,240 | $3M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 87,103 | $3M | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 83,207 | $3M | 0.1% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND trimmed | 81,199 | $3M | 0.1% | 2026-Q2 |
| OSAIC HOLDINGS, INC. added | 80,043 | $3M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 76,768 | $3M | 0.1% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD trimmed | 75,500 | $3M | 0.1% | 2026-Q2 |
| AEGON ASSET MANAGEMENT UK Plc trimmed | 74,609 | $3M | 0.1% | 2026-Q2 |
| KLP KAPITALFORVALTNING AS | 69,500 | $3M | 0.1% | 2026-Q2 |
| Cresset Asset Management, LLC trimmed | 69,393 | $3M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 68,398 | $3M | 0.1% | 2026-Q2 |
| Vest Financial, LLC new | 66,670 | $2M | 0.1% | 2026-Q2 |
| GLOBEFLEX CAPITAL L P | 65,303 | $2M | 0.1% | 2026-Q2 |
| Verity Asset Management, Inc. added | 64,164 | $2M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.