As of November 6, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of A10 Networks Inc. The largest reported stake is First Trust Portfolios L.P.'s, at 6.68%. 6 filings are on record since July 9, 2025 (Schedule 13G, July 30, 2026).
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Key facts
- · Reporting person: Vanguard Portfolio Management · Sole voting: 66,757 · Shared voting: 0 · Sole dispositive: 3,788,363 · Shared dispositive: 0 · SCHEDULE 13G, 2026-10-30
- · Reporting person: Vanguard Capital Management · Sole voting: 547,543 · Shared voting: 0 · Sole dispositive: 3,624,539 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-30
- · Reporting person: First Trust Portfolios L.P. · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 1,497,852 · SCHEDULE 13G, 2026-07-30
- · Holder: Vanguard Capital Management · Percent: 5.09% · SCHEDULE 13G
- · Reporting person: The Vanguard Group · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-03-26
A10 Networks Inc has 6 Schedule 13D or 13G filings on record since 2025-07-09. 2 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| First Trust Portfolios L.P. | 6.68% | 4,809,261 | SCHEDULE 13G, 2026-07-30 | 2026-06-30 |
| Vanguard Portfolio Management | 5.21% | 3,788,363 | SCHEDULE 13G, 2026-10-30 | 2026-09-30 |
| Vanguard Capital Management | 4.99% | 3,624,539 | SCHEDULE 13G/A, 2026-10-30 | 2026-09-30 |
| Legal & General Group Plc | 3.1% | 2,405,702 | SCHEDULE 13G/A, 2025-07-09 | 2021-12-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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Keep reading
More on A10 Networks Inc and the records around it.
A10 Networks Inc elsewhere on the record
- Leadership changes Sep 2026
- Who owns it
Companies that share a holder
- Legal & General Group Plc also filed stake reports on 7 other companies: Fastly, Inc. (Jul 2025), NETSCOUT SYSTEMS, INC. (Jul 2025), Eos Energy Enterprises, Inc. (Jul 2025)
- First Trust Portfolios L.P. also filed stake reports on 105 other companies: First Trust Exchange-Traded Fund (Nov 2026), First Trust Exchange-Traded Fund IV (Nov 2026), First Trust Exchange-Traded Fund VIII (Nov 2026)
- Vanguard Portfolio Management also filed stake reports on 941 other companies: Newmark Group Inc (Nov 2026), ADT Inc (Oct 2026), Appian Corp (Oct 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| First Trust Portfolios L.P. | 0 | 0 | 0 | 1,497,852 | SCHEDULE 13G, 2026-07-30 |
| First Trust Advisors L.P. | 0 | 3,310,470 | 0 | 4,809,261 | SCHEDULE 13G, 2026-07-30 |
| The Charger Corporation | 0 | 3,310,470 | 0 | 4,809,261 | SCHEDULE 13G, 2026-07-30 |
| Vanguard Portfolio Management | 66,757 | 0 | 3,788,363 | 0 | SCHEDULE 13G, 2026-10-30 |
| Vanguard Capital Management | 547,543 | 0 | 3,624,539 | 0 | SCHEDULE 13G/A, 2026-10-30 |
| Legal & General Group Plc | 0 | 2,388,253 | 0 | 2,405,702 | SCHEDULE 13G/A, 2025-07-09 |
| Legal & General Investment Management Ltd | 0 | 2,388,253 | 0 | 2,388,253 | SCHEDULE 13G/A, 2025-07-09 |
| LGIM Managers (Europe) Limited | 0 | 2,386,395 | 0 | 2,386,395 | SCHEDULE 13G/A, 2025-07-09 |
| Legal & General UCITS ETF Plc | 0 | 2,386,395 | 0 | 2,386,395 | SCHEDULE 13G/A, 2025-07-09 |
| Legal & General Investment Management America Inc | 0 | 0 | 0 | 17,449 | SCHEDULE 13G/A, 2025-07-09 |
| The Vanguard Group | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-03-26 |
The latest filing identifies A10 Networks Inc by CUSIP 002121101 and gives its principal executive office as 3 West Plumeria Drive, San Jose, CA 95134 (SCHEDULE 13G, 2026-10-30).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-09 | Legal & General Group Plc | 3.1% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Capital Management | 5.09% | SCHEDULE 13G |
| 2026-07-30 | First Trust Portfolios L.P. | 6.68% | SCHEDULE 13G |
| 2026-10-30 | Vanguard Capital Management | 4.99% | SCHEDULE 13G/A |
| 2026-10-30 | Vanguard Portfolio Management | 5.21% | SCHEDULE 13G |
Questions about who owns A10 Networks Inc
Who owns A10 Networks Inc?
On this page, 2 holders' latest ownership filings report 5% or more of A10 Networks Inc: First Trust Portfolios L.P. (6.68%, Schedule 13G, filed 2026-07-30) and Vanguard Portfolio Management (5.21%, Schedule 13G, filed 2026-10-30).
Who are the largest shareholders of A10 Networks Inc?
By the share each holder's latest filing reports, the largest holders of A10 Networks Inc on this page are First Trust Portfolios L.P. (6.68%) and Vanguard Portfolio Management (5.21%).
When did First Trust Portfolios L.P. buy into A10 Networks Inc?
The filings give report dates, not purchase dates. The earliest filing from First Trust Portfolios L.P. on this page is the Schedule 13G, filed 2026-07-30, reporting 6.68%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 6 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for A10 Networks Inc
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| September 14, 2026 | Leadership change: Mary C. Henry appointed, Director | — | Leadership changes | Source |
| May 1, 2026 | Leadership change: Sheen Khoury departs, Executive Vice President, Worldwide Sales and Marketing | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.