DaveManuel.com · Institutional Ownership · Who Owns It
A10 NETWORKS INC (ATEN)
Institutional ownership reported to the SEC as of Q2 2026, across 32 quarters.
317
Reporting holders
$2.9B
Reported value
105.4%
Of shares outstanding
1.1%
Calls
0.0%
Puts
+50
Holder change
Institutions report 76,532,222 shares against 72,609,021 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. Over 100% because an adviser and a sub-adviser can both report the same shares, and both are counted.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $506.9M | 13,568,496 | 0.01% | 8q | +3.7%+$17.9M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $129.3M | 3,462,058 | 0.01% | 2q | +2.2%+$2.8M |
| FIRST TRUST ADVISORS LP | $121.2M | 3,244,739 | 0.07% | 30q | +88.7%+$57.0M |
| STATE STREET CORP | $115.2M | 3,082,631 | 0.00% | 31q | HELD |
| VANGUARD CAPITAL MANAGEMENT LLC | $114.7M | 3,071,071 | 0.00% | 2q | -1.6%-$1.9M |
| Penserra Capital Management LLC | $114.6M | 3,068,045 | 0.88% | 7q | -14.6%-$19.7M |
| Boston Trust Walden Corp | $90.3M | 2,416,808 | 0.69% | 6q | +11.2%+$9.1M |
| WELLINGTON MANAGEMENT GROUP LLP | $73.2M | 1,959,853 | 0.01% | 7q | -5.5%-$4.3M |
| GEODE CAPITAL MANAGEMENT, LLC | $67.8M | 1,813,638 | 0.00% | 31q | +5.6%+$3.6M |
| GOLDMAN SACHS GROUP INC | $66.7M | 1,784,946 | 0.01% | 31q | +50.4%+$22.3M |
| DIMENSIONAL FUND ADVISORS LP | $59.7M | 1,599,129 | 0.01% | 31q | -2.3%-$1.4M |
| RENAISSANCE TECHNOLOGIES LLC | $56.8M | 1,520,287 | 0.08% | 31q | -14.8%-$9.9M |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $53.7M | 1,437,650 | 0.02% | 8q | -4.0%-$2.2M |
| FMR LLC | $53.6M | 1,433,878 | 0.00% | 23q | +5001.7%+$52.5M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $53.3M | 1,426,608 | 0.06% | 9q | -8.3%-$4.8M |
| Invesco Ltd. | $46.4M | 1,243,053 | 0.00% | 31q | +242.7%+$32.9M |
| PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. | $44.4M | 1,188,747 | 2.20% | 18q | -18.6%-$10.1M |
| TWO SIGMA INVESTMENTS, LP | $42.0M | 1,124,963 | 0.03% | 15q | -14.8%-$7.3M |
| PRUDENTIAL FINANCIAL INC | $39.2M | 1,048,320 | 0.04% | 27q | +18.4%+$6.1M |
| BARCLAYS PLC | $36.0M | 962,382 | 0.01% | 31q | -48.7%-$34.1M |
| MORGAN STANLEY | $33.9M | 908,083 | 0.00% | 35q | +11.7%+$3.5M |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | $33.5M | 896,517 | 0.05% | new | NEW |
| PRICE T ROWE ASSOCIATES INC /MD/ | $33.4M | 894,398 | 0.00% | 16q | -16.6%-$6.7M |
| LOOMIS SAYLES & CO L P | $33.0M | 884,023 | 0.04% | new | NEW |
| Boston Partners | $30.0M | 802,469 | 0.03% | 3q | -1.6%-$498.3K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $28.5M | 761,676 | 0.00% | 31q | +2.4%+$661.6K |
| NORTHERN TRUST CORP | $28.3M | 756,476 | 0.00% | 31q | +7.4%+$1.9M |
| UBS Group AG | $27.5M | 736,554 | 0.00% | 31q | +88.8%+$12.9M |
| Bank of New York Mellon Corp | $24.7M | 659,883 | 0.00% | 31q | HELD |
| ROYCE & ASSOCIATES LP | $22.3M | 597,646 | 0.18% | 31q | -26.9%-$8.2M |
| BNP PARIBAS FINANCIAL MARKETS | $21.4M | 573,164 | 0.01% | 31q | +47.1%+$6.9M |
| OBERWEIS ASSET MANAGEMENT INC/ | $20.6M | 552,000 | 0.43% | 2q | +9.5%+$1.8M |
| D. E. Shaw & Co., Inc. | $20.5M | 547,577 | 0.01% | 2q | +107.9%+$10.6M |
| VANGUARD FIDUCIARY TRUST CO | $19.1M | 511,169 | 0.00% | 2q | +3.4%+$625.3K |
| ROYAL BANK OF CANADA | $17.3M | 463,003 | 0.00% | 31q | -13.7%-$2.7M |
| BANK OF AMERICA CORP /DE/ | $17.2M | 461,387 | 0.00% | 31q | +123.2%+$9.5M |
| Aptus Capital Advisors, LLC | $17.1M | 457,762 | 0.12% | 6q | +0.6%+$103.1K |
| ACADIAN ASSET MANAGEMENT LLC | $17.0M | 455,769 | 0.02% | new | NEW |
| PRINCIPAL FINANCIAL GROUP INC | $16.7M | 446,423 | 0.01% | 20q | +2.3%+$379.0K |
| Defiance ETFs, LLC | $15.7M | 412,194 | 0.21% | 3q | -2.6%-$415.9K |
| WASATCH ADVISORS LP | $15.5M | 416,114 | 0.10% | new | NEW |
| Impax Asset Management Group plc | $15.3M | 410,000 | 0.10% | 18q | -12.8%-$2.2M |
| Ceredex Value Advisors LLC | $14.5M | 387,750 | 0.41% | new | NEW |
| PARADIGM CAPITAL MANAGEMENT INC/NY | $14.4M | 384,700 | 0.39% | 31q | -4.2%-$623.9K |
| PEAK6 LLC | $12.4M CALL | options only | 0.03% | 2q | OPTIONS |
| WELLS FARGO & COMPANY/MN | $12.3M | 329,534 | 0.00% | 31q | -0.9%-$112.1K |
| Jump Financial, LLC | $12.1M | 324,417 | 0.10% | 2q | +12.9%+$1.4M |
| Bridge City Capital, LLC | $11.1M | 296,239 | 2.53% | 22q | -26.1%-$3.9M |
| CRAWFORD INVESTMENT COUNSEL INC | $11.0M | 295,532 | 0.18% | 4q | -7.8%-$937.4K |
| JPMORGAN CHASE & CO | $10.4M | 283,306 | 0.00% | 31q | -13.3%-$1.6M |
| ENVESTNET ASSET MANAGEMENT INC | $9.3M | 247,901 | 0.00% | new | NEW |
| Public Sector Pension Investment Board | $9.2M | 247,318 | 0.02% | 17q | -3.3%-$316.4K |
| RICE HALL JAMES & ASSOCIATES, LLC | $9.2M | 245,117 | 0.45% | 21q | -27.2%-$3.4M |
| Nuveen, LLC | $8.8M | 236,607 | 0.00% | 6q | +49.2%+$2.9M |
| AMERICAN CENTURY COMPANIES INC | $8.8M | 234,381 | 0.00% | 18q | +5.4%+$448.8K |
| Portolan Capital Management, LLC | $8.5M | 226,920 | 0.32% | new | NEW |
| PEREGRINE CAPITAL MANAGEMENT LLC | $7.5M | 201,952 | 0.25% | 22q | -8.0%-$660.0K |
| SUMMIT PARTNERS L P | $7.5M | 200,065 | 1.23% | 31q | HELD |
| Legal & General Group Plc | $7.1M | 189,446 | 0.00% | 31q | -0.6%-$43.7K |
| Informed Momentum Co LLC | $7.1M | 188,768 | 0.63% | new | NEW |
| Connor, Clark & Lunn Investment Management Ltd. | $6.7M | 178,808 | 0.01% | 10q | +31.1%+$1.6M |
| MILLENNIUM MANAGEMENT LLC | $6.6M | 175,579 | 0.00% | 9q | -57.7%-$8.9M |
| RHUMBLINE ADVISERS | $6.4M | 172,167 | 0.00% | 31q | -10.4%-$745.1K |
| BESSEMER GROUP INC | $6.4M | 171,223 | 0.01% | 13q | HELD |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $6.3M incl. $5.8M options CALL | 13,733 | 0.00% | 31q | -87.3%-$43.5M |
| AMERIPRISE FINANCIAL INC | $6.3M | 168,623 | 0.00% | 19q | +36.5%+$1.7M |
| Uniplan Investment Counsel, Inc. | $6.0M | 161,381 | 0.57% | 2q | +51.9%+$2.1M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $5.9M | 159,216 | 0.00% | 14q | -1.4%-$87.3K |
| IQ EQ FUND MANAGEMENT (IRELAND) Ltd | $5.9M | 158,843 | 0.38% | 25q | -9.3%-$610.9K |
| SEI INVESTMENTS CO | $5.7M | 151,678 | 0.00% | 23q | +25.1%+$1.1M |
| Creative Planning | $5.6M | 149,624 | 0.00% | 10q | +17.6%+$835.2K |
| HARBOR CAPITAL ADVISORS, INC. | $5.5M | 147,669 | 0.38% | 13q | -21.1%-$1.5M |
| VOYA INVESTMENT MANAGEMENT LLC | $5.4M | 143,421 | 0.00% | 31q | -13.8%-$861.4K |
| Hennion & Walsh Asset Management, Inc. | $5.3M | 141,978 | 0.15% | 7q | +24.4%+$1.0M |
| TRUIST FINANCIAL CORP | $5.2M | 138,302 | 0.01% | 6q | +20.2%+$870.0K |
| CREDIT AGRICOLE S A | $5.2M | 138,000 | 0.01% | new | NEW |
| CITADEL ADVISORS LLC | $5.1M incl. $1.6M options CALL+PUT | 93,240 | 0.00% | 31q | -81.9%-$23.1M |
| Swiss National Bank | $5.1M | 136,700 | 0.00% | 31q | -4.0%-$213.0K |
| 4D Advisors, LLC | $5.0M | 135,000 | 1.94% | new | NEW |
| Russell Investments Group, Ltd. | $5.0M | 134,991 | 0.00% | 26q | -65.4%-$9.5M |
| SIMPLEX TRADING, LLC | $4.9M incl. $3.3M options CALL+PUT | 41,672 | 0.00% | 29q | +255.7%+$3.5M |
| CITIGROUP INC | $4.8M | 128,365 | 0.00% | 31q | +180.6%+$3.1M |
| VICTORY CAPITAL MANAGEMENT INC | $4.6M | 122,942 | 0.00% | 24q | -10.5%-$538.4K |
| TUDOR INVESTMENT CORP ET AL | $4.5M | 120,260 | 0.01% | 9q | -49.7%-$4.4M |
| Caption Management, LLC | $4.5M CALL | options only | 0.02% | new | OPTIONS |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM | $4.3M | 114,819 | 0.01% | 31q | -11.4%-$552.5K |
| FEDERATED HERMES, INC. | $4.3M | 114,416 | 0.01% | 15q | +7.7%+$304.4K |
| PDT Partners, LLC | $4.2M | 111,226 | 0.22% | 3q | +12.8%+$470.7K |
| Universal- Beteiligungs- und Servicegesellschaft mbH | $3.9M | 104,707 | 0.01% | 6q | +16.1%+$541.3K |
| Brevan Howard Capital Management LP | $3.8M | 102,085 | 0.03% | 2q | +310.0%+$2.9M |
| JANE STREET GROUP, LLC | $3.8M incl. $291.4K options CALL | 93,880 | 0.00% | 2q | -84.2%-$20.3M |
| FRANKLIN RESOURCES INC | $3.7M | 99,729 | 0.00% | 20q | -4.1%-$159.5K |
| HSBC HOLDINGS PLC | $3.5M | 94,437 | 0.00% | 10q | -46.3%-$3.0M |
| DEUTSCHE BANK AG\ | $3.3M | 87,103 | 0.00% | 34q | +8.2%+$245.8K |
| AQR CAPITAL MANAGEMENT LLC | $3.1M | 83,207 | 0.00% | 31q | +66.9%+$1.2M |
| NEW YORK STATE COMMON RETIREMENT FUND | $3.0M | 81,199 | 0.00% | 31q | -65.6%-$5.8M |
| OSAIC HOLDINGS, INC. | $3.0M | 80,043 | 0.00% | 5q | +1760.6%+$2.8M |
| Allianz Asset Management GmbH | $3.0M | 79,525 | 0.00% | 20q | +20.6%+$507.0K |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | $2.9M | 76,768 | 0.00% | 31q | -16.1%-$548.6K |
| CANADA PENSION PLAN INVESTMENT BOARD | $2.8M | 75,500 | 0.00% | 9q | -3.6%-$104.6K |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-10-30 | 13G/A | Vanguard Capital Management | 5.0% |
| 2026-10-30 | 13G | Vanguard Portfolio Management | 5.2% |
What the company announced
Form 8-K filings from the last 120 days, showing only the items worth a reader's attention. Earnings releases, exhibit attachments and general disclosures are filed constantly and are left out. Filed is when the SEC received it; event is the date the company says the thing happened.
| Filed | Event date | What | Source |
|---|---|---|---|
| 2026-09-14 | 2026-09-09 | Directors or officers departed or appointed | filing |
| 2026-08-05 | 2026-08-03 | Material agreement entered | filing |
What the insiders did
Open market purchases and sales reported on Form 4 in the last 180 days. Grants, option exercises and shares surrendered to cover tax are left out: they are compensation rather than a decision to buy or sell. Where a broker filled one order in tranches the lines are summed, because it was one decision.
Officers and directors
| Date | Insider | Role | Side | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-11 | Weber Robert Scott | General Counsel | Sold | 14,086 | $392.4K |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q3 2026 | 61 | $59.5M | 2,147,351 | 9 | 19 | 16 | 0.0% |
| Q2 2026 | 317 | $2.9B | 76,532,222 | 78 | 89 | 98 | 1.1% |
| Q1 2026 | 267 | $1.7B | 72,326,066 | 55 | 95 | 72 | 0.5% |
| Q4 2025 | 244 | $1.2B | 70,435,923 | 32 | 79 | 87 | 0.0% |
| Q3 2025 | 241 | $1.3B | 70,555,619 | 39 | 83 | 82 | 0.1% |
| Q2 2025 | 235 | $1.4B | 70,383,675 | 22 | 88 | 94 | 0.1% |
| Q1 2025 | 258 | $1.2B | 70,799,074 | 59 | 80 | 84 | 0.4% |
| Q4 2024 | 222 | $1.2B | 65,339,649 | 29 | 85 | 62 | 0.0% |
| Q3 2024 | 208 | $949.2M | 65,656,427 | 20 | 80 | 64 | 0.1% |
| Q2 2024 | 219 | $927.1M | 66,795,367 | 53 | 76 | 58 | 0.2% |
| Q1 2024 | 184 | $969.0M | 70,457,066 | 22 | 59 | 70 | 0.2% |
| Q4 2023 | 196 | $917.6M | 69,502,172 | 23 | 74 | 67 | 0.2% |
| Q3 2023 | 196 | $984.4M | 65,400,445 | 16 | 72 | 66 | 0.2% |
| Q2 2023 | 198 | $954.6M | 65,361,669 | 18 | 69 | 81 | 0.1% |
| Q1 2023 | 217 | $984.7M | 63,540,348 | 29 | 74 | 66 | 0.0% |
| Q4 2022 | 221 | $1.1B | 65,860,535 | 43 | 55 | 91 | 0.1% |
| Q3 2022 | 192 | $1.1B | 277,638,705 | 26 | 80 | 58 | 0.5% |
| Q2 2022 | 196 | $1.8B | 308,841,833 | 41 | 69 | 62 | 0.3% |
| Q1 2022 | 189 | $1.7B | 122,138,782 | 29 | 65 | 76 | 0.2% |
| Q4 2021 | 173 | $2.0B | 122,490,543 | 37 | 61 | 50 | 0.2% |
| Q3 2021 | 148 | $1.1B | 80,271,352 | 28 | 48 | 48 | 0.1% |
| Q2 2021 | 130 | $912.5M | 80,925,420 | 16 | 39 | 48 | 0.2% |
| Q1 2021 | 134 | $724.7M | 75,315,614 | 19 | 44 | 53 | 0.3% |
| Q4 2020 | 142 | $777.2M | 78,695,293 | 26 | 59 | 40 | 0.2% |
| Q3 2020 | 137 | $486.0M | 76,116,385 | 28 | 59 | 34 | 0.2% |
| Q2 2020 | 123 | $536.4M | 78,878,762 | 30 | 53 | 24 | 0.0% |
| Q1 2020 | 106 | $516.0M | 82,890,923 | 21 | 33 | 31 | 0.0% |
| Q4 2019 | 102 | $417.0M | 60,685,248 | 13 | 31 | 44 | 0.0% |
| Q3 2019 | 99 | $486.8M | 69,716,778 | 16 | 34 | 36 | 0.8% |
| Q2 2019 | 93 | $485.8M | 68,663,576 | 7 | 50 | 28 | 3.6% |
| Q1 2019 | 108 | $476.1M | 65,677,652 | 18 | 49 | 26 | 2.2% |
| Q4 2018 | 99 | $400.4M | 63,472,853 | 2 | 1 | 1 | 1.1% |