Latest Period
Q1 2026
Security Snapshot
A10 Networks, Inc. - Common Stock (ATEN) Institutional Ownership
CUSIP: 002121101
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
261
Shares (Excl. Options)
72,278,001
Price
$23.12
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- Security type / class
- Equity / Common Stock
- Symbol
- ATEN on NYSE
- Shares outstanding
- 71,754,597
- Reported price per share
- $27.35
- Price from insider filings
- $27.35
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 72,278,001
- Total reported value
- $1,670,840,452
- Portfolio coverage rank
- 0%
- Share change
- +2,080,285
- Value change
- +$57,024,217
- Number of holders
- 261
Security identity
Issuer context
Latest holder snapshot
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Key facts
- ATEN - A10 Networks, Inc. - Common Stock is tracked under CUSIP 002121101.
- 261 institutions reported positions in Q1 2026.
- 2 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 241 to 261 between Q4 2025 and Q1 2026.
- Reported value moved from $1,243,378,521 to $1,670,840,452.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 261 institutions filings for Q1 2026.
Security key
002121101
Latest holder period
Q1 2026
13F holders
261
13D/G owners
2
CIK / CUSIP context first
Open Q1 2026 holders
ATEN full holder history
A10 Networks, Inc. SEC filings
A10 Networks, Inc. company facts
A10 Networks, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 002121101:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
2
Security
ATEN
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC | 5.1% | $84,441,384 | 3,652,309 | Vanguard Capital Management | 31 Mar 2026 | |||
| Legal & General Investment Management Ltd | 3.1% | $46,550,093 | 2,405,702 | Legal & General Group Plc | 31 Dec 2021 |
As of 31 Mar 2026, 261 institutional investors reported holding 72,278,001 shares of A10 Networks, Inc. - Common Stock (ATEN). This represents 101% of the company’s total 71,754,597 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
74%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 18% | 13,088,277 | +0.79% | 0.01% | $302,600,956 |
| Penserra Capital Management LLC | 5% | 3,594,112 | -16% | 0.97% | $83,094,000 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 4.7% | 3,387,848 | 0% | 0% | $78,327,046 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.3% | 3,121,015 | 0% | 0% | $72,157,867 |
| STATE STREET CORP | 4.3% | 3,090,185 | -0.83% | 0% | $71,445,077 |
| Boston Trust Walden Corp | 3% | 2,173,261 | -11% | 0.41% | $50,245,794 |
| WELLINGTON MANAGEMENT GROUP LLP | 2.9% | 2,074,511 | +2.7% | 0.01% | $47,962,696 |
| BARCLAYS PLC | 2.6% | 1,874,502 | +1.8% | 0.02% | $43,338,486 |
| RENAISSANCE TECHNOLOGIES LLC | 2.5% | 1,784,987 | -16% | 0.06% | $41,268,899 |
| FIRST TRUST ADVISORS LP | 2.4% | 1,719,817 | -30% | 0.03% | $39,762,169 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.4% | 1,717,406 | -3.4% | 0% | $39,714,369 |
| DIMENSIONAL FUND ADVISORS LP | 2.3% | 1,635,947 | -0.78% | 0.01% | $37,820,003 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 2.2% | 1,556,176 | +7.4% | 0.05% | $35,967,513 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 2.1% | 1,497,144 | +37% | 0.02% | $34,613,969 |
| PUNCH & ASSOCIATES INVESTMENT MANAGEMENT, INC. | 2% | 1,459,910 | +1.7% | 1.9% | $33,753,113 |
| TWO SIGMA INVESTMENTS, LP | 1.8% | 1,319,989 | +80% | 0.03% | $30,518,146 |
| GOLDMAN SACHS GROUP INC | 1.7% | 1,186,743 | +15% | 0% | $27,437,501 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1.5% | 1,072,838 | -30% | 0% | $24,805,000 |
| PRUDENTIAL FINANCIAL INC | 1.2% | 885,207 | +1106% | 0.03% | $20,465,986 |
| ROYCE & ASSOCIATES LP | 1.1% | 817,430 | +12% | 0.19% | $18,898,982 |
| Boston Partners | 1.1% | 815,790 | -2.9% | 0.02% | $18,996,793 |
| MORGAN STANLEY | 1.1% | 813,087 | +1.1% | 0% | $18,798,596 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1% | 743,968 | +2.1% | 0% | $17,200,540 |
| NORTHERN TRUST CORP | 0.98% | 704,404 | +2.4% | 0% | $16,285,820 |
| Bank of New York Mellon Corp | 0.92% | 660,638 | -0.75% | 0% | $15,273,950 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q1 2026
Rows shown
1-25 of 49
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 72,278,001 | $1,670,840,452 | +$57,024,217 | $23.12 | 261 |
| 2025 Q4 | 70,281,999 | $1,243,378,521 | -$9,201,116 | $17.69 | 241 |
| 2025 Q3 | 70,175,328 | $1,273,706,190 | -$5,933,480 | $18.15 | 235 |
| 2025 Q2 | 70,356,781 | $1,361,399,966 | +$12,807,261 | $19.35 | 228 |
| 2025 Q1 | 70,069,030 | $1,145,010,285 | +$74,061,719 | $16.34 | 250 |
| 2024 Q4 | 65,023,933 | $1,196,430,987 | +$1,517,140 | $18.40 | 217 |
| 2024 Q3 | 65,329,932 | $943,377,304 | -$22,895,903 | $14.44 | 205 |
| 2024 Q2 | 66,605,248 | $922,442,459 | -$45,022,565 | $13.85 | 216 |
| 2024 Q1 | 67,636,871 | $928,770,250 | +$160,707 | $13.69 | 181 |
| 2023 Q4 | 67,701,244 | $891,612,240 | +$31,693,298 | $13.17 | 189 |
| 2023 Q3 | 65,322,589 | $981,799,095 | +$297,731 | $15.03 | 191 |
| 2023 Q2 | 65,353,425 | $953,578,596 | +$32,328,411 | $14.59 | 195 |
| 2023 Q1 | 63,529,814 | $984,023,416 | -$39,311,216 | $15.49 | 214 |
| 2022 Q4 | 65,905,004 | $1,095,968,396 | +$15,993,327 | $16.63 | 220 |
| 2022 Q3 | 65,180,756 | $864,946,691 | -$62,771,185 | $13.27 | 186 |
| 2022 Q2 | 68,739,787 | $988,224,155 | +$89,098,269 | $14.38 | 194 |
| 2022 Q1 | 63,381,238 | $884,250,577 | -$16,566,449 | $13.95 | 189 |
| 2021 Q4 | 64,752,279 | $1,072,853,997 | -$50,652,948 | $16.58 | 174 |
| 2021 Q3 | 67,225,746 | $905,996,390 | +$14,969,942 | $13.48 | 149 |
| 2021 Q2 | 66,068,645 | $744,229,727 | +$6,894,407 | $11.26 | 132 |
| 2021 Q1 | 65,708,350 | $630,499,637 | +$28,739,618 | $9.61 | 133 |
| 2020 Q4 | 62,784,683 | $618,930,554 | +$35,638,570 | $9.86 | 144 |
| 2020 Q3 | 60,024,202 | $382,700,781 | +$17,450,035 | $6.37 | 141 |
| 2020 Q2 | 57,174,252 | $389,100,218 | +$21,932,393 | $6.81 | 125 |
| 2020 Q1 | 53,867,248 | $335,711,051 | +$12,702,220 | $6.21 | 105 |