A10 Networks, Inc.
US ˙ NYSE ˙ US0021211018

SecurityATEN / A10 Networks, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership3,090,185 shares
Latest Disclosed Value $ 71,445,077
State Street Corp reports 0.83% decrease in ownership of ATEN / A10 Networks, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 3,090,185 shares of A10 Networks, Inc. (US:ATEN) valued at $71,445,077 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 3,116,155 shares of A10 Networks, Inc.. This represents a change in shares of -0.83% during the quarter. The current value of the position is $94,466,955 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F A10 NETWORKS COM 002121101 3,090,185 -25,970 -0.83 71,445 29.61 0.0025
2026-02-13 2025-12-31 13F A10 NETWORKS COM 002121101 3,116,155 -172,032 -5.23 55,125 -7.63 0.0018
2025-11-14 2025-09-30 13F A10 NETWORKS COM 002121101 3,288,187 -34,466 -1.04 59,681 -7.17 0.0021
2025-08-14 2025-06-30 13F A10 NETWORKS COM 002121101 3,322,653 -19,855 -0.59 64,293 17.72 0.0024
2025-05-15 2025-03-31 13F A10 NETWORKS COM 002121101 3,342,508 11,963 0.36 54,617 -10.88 0.0023
2025-02-14 2024-12-31 13F A10 NETWORKS COM 002121101 3,330,545 159,468 5.03 61,282 33.83 0.0024
2024-11-14 2024-09-30 13F A10 NETWORKS COM 002121101 3,171,077 62,015 1.99 45,790 6.34 0.0019
2024-08-14 2024-06-30 13F A10 NETWORKS COM 002121101 3,109,062 -192,530 -5.83 43,061 -4.73 0.0019
2024-05-15 2024-03-31 13F A10 NETWORKS COM 002121101 3,301,592 110,771 3.47 45,199 7.56 0.0020
2024-02-14 2023-12-31 13F A10 NETWORKS COM 002121101 3,190,821 426,486 15.43 42,023 1.15 0.0020
2023-11-14 2023-09-30 13F A10 NETWORKS COM 002121101 2,764,335 199,632 7.78 41,548 11.03 0.0023
2023-08-14 2023-06-30 13F A10 NETWORKS COM 002121101 2,564,703 201,475 8.53 37,419 2.22 0.0020
2023-05-15 2023-03-31 13F A10 NETWORKS COM 002121101 2,363,228 123,539 5.52 36,606 -1.72 0.0021
2023-05-15 2022-12-31 13F/A-99 A10 NETWORKS COM 002121101 2,239,689 -246,716 -9.92 37,246 12.88 0.0022
2023-05-15 2022-12-31 13F A10 NETWORKS COM 002121101 2,239,689 -246,716 37,246 0.0022
2022-11-15 2022-09-30 13F A10 NETWORKS COM 002121101 2,486,405 153,784 6.59 32,995 -1.63 0.0021
2022-08-15 2022-06-30 13F A10 NETWORKS COM 002121101 2,332,621 582,392 33.28 33,543 37.38 0.0020
2022-05-16 2022-03-31 13F A10 NETWORKS COM 002121101 1,750,229 26,989 1.57 24,416 -14.54 0.0012
2022-02-14 2021-12-31 13F A10 NETWORKS COM 002121101 1,723,240 -179,161 -9.42 28,571 11.41 0.0014
2021-11-15 2021-09-30 13F A10 NETWORKS COM 002121101 1,902,401 73,063 3.99 25,644 24.50 0.0014
2021-08-16 2021-06-30 13F A10 NETWORKS COM 002121101 1,829,338 357,761 24.31 20,598 45.65 0.0011
2021-07-09 2021-03-31 13F/A-1 A10 NETWORKS COM 002121101 1,471,577 -18,001 -1.21 14,142 -3.71 0.0008
2021-05-17 2021-03-31 13F A10 NETWORKS COM 002121101 1,471,577 -18,001 14,142 0.0008
2021-02-16 2020-12-31 13F A10 NETWORKS COM 002121101 1,489,578 -64,191 -4.13 14,687 48.38 0.0009
2020-11-10 2020-09-30 13F A10 NETWORKS COM 002121101 1,553,769 -274 -0.02 9,898 -6.47 0.0007
2020-08-14 2020-06-30 13F A10 NETWORKS COM 002121101 1,554,043 274,920 21.49 10,583 33.24 0.0008
2020-06-19 2020-03-31 13F/A-1 A10 NETWORKS COM 002121101 1,279,123 -47,856 -3.61 7,943 -12.87 0.0007
2020-05-11 2020-03-31 13F A10 NETWORKS COM 002121101 1,279,123 -47,856 7,943 697.5553
2020-02-06 2019-12-31 13F A10 NETWORKS COM 002121101 1,326,979 -13,002 -0.97 9,116 -1.97 0.0006
2019-11-14 2019-09-30 13F A10 NETWORKS COM 002121101 1,339,981 64,710 5.07 9,299 6.92 0.0007
2019-08-14 2019-06-30 13F A10 NETWORKS COM 002121101 1,275,271 126,565 11.02 8,697 6.79 0.0006
2019-05-15 2019-03-31 13F A10 NETWORKS COM 002121101 1,148,706 131,964 12.98 8,144 28.37 0.0006
2019-02-12 2018-12-31 13F A10 NETWORKS COM 002121101 1,016,742 -12,149 -1.18 6,344 1.41 0.0006
2018-11-09 2018-09-30 13F A10 NETWORKS Common equity shares 002121101 1,028,891 63,190 6.54 6,256 4.01 0.0005
2018-08-14 2018-06-30 13F A10 NETWORKS Common equity shares 002121101 965,701 -6,278 -0.65 6,015 6.33 0.0005
2018-05-15 2018-03-31 13F A10 NETWORKS Common equity shares 002121101 971,979 5,002 0.52 5,657 -24.21 0.0005
2018-02-14 2017-12-31 13F A10 NETWORKS Common equity shares 002121101 966,977 83,909 9.50 7,464 11.75 0.0006
2017-11-14 2017-09-30 13F A10 NETWORKS Common equity shares 002121101 883,068 -28,172 -3.09 6,679 -13.18 0.0006
2017-08-14 2017-06-30 13F A10 NETWORKS Common equity shares 002121101 911,240 36,263 4.14 7,693 -3.93 0.0007
2017-05-15 2017-03-31 13F A10 NETWORKS Common equity shares 002121101 874,977 131,292 17.65 8,008 29.62 0.0007
2017-02-09 2016-12-31 13F A10 NETWORKS Common equity shares 002121101 743,685 56,483 8.22 6,178 -15.87 0.0006
2017-01-13 2016-09-30 13F/A-1 A10 NETWORKS Common equity shares 002121101 687,202 130,052 23.34 7,343 103.63 0.0007
2016-11-14 2016-09-30 13F A10 NETWORKS Common equity shares 002121101 687,202 7,343
2016-08-12 2016-06-30 13F A10 NETWORKS Common equity shares 002121101 557,150 75,643 15.71 3,606 26.44 0.0004
2016-05-20 2016-03-31 13F/A-1 A10 NETWORKS Common equity shares 002121101 481,507 24,684 5.40 2,852 -4.81 0.0003
2016-05-12 2016-03-31 13F A10 NETWORKS Common equity shares 002121101 481,507 2,852
2016-02-16 2015-12-31 13F A10 NETWORKS Common equity shares 002121101 456,823 61,707 15.62 2,996 26.68 0.0003
2015-11-16 2015-09-30 13F A10 NETWORKS Common equity shares 002121101 395,116 102,536 35.05 2,365 25.46 0.0003
2015-08-13 2015-06-30 13F A10 NETWORKS Common equity shares 002121101 292,580 134,661 85.27 1,885 175.58 0.0002
2015-05-15 2015-03-31 13F A10 NETWORKS Common equity shares 002121101 157,919 30,625 24.06 684 23.47 0.0001
2015-02-11 2014-12-31 13F A10 NETWORKS Common equity shares 002121101 127,294 150 0.12 554 -52.08 0.0001
2014-11-12 2014-09-30 13F/A-1 A10 NETWORKS Common equity shares 002121101 127,144 25,770 25.42 1,156 -14.18 0.0001
2014-11-10 2014-09-30 13F A10 NETWORKS Common equity shares 002121101 127,144 1,156
2014-08-12 2014-06-30 13F A10 NETWORKS Common equity shares 002121101 101,374 101,374 1,347 0.0001
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.