A10 Networks, Inc.
US ˙ NYSE ˙ US0021211018

SecurityATEN / A10 Networks, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership813,087 shares
Latest Disclosed Value $ 18,798,596
Morgan Stanley reports 1.09% increase in ownership of ATEN / A10 Networks, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 813,087 shares of A10 Networks, Inc. (US:ATEN) valued at $18,798,571 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 804,350 shares of A10 Networks, Inc.. This represents a change in shares of 1.09% during the quarter. The current value of the position is $24,856,070 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 813,087 8,737 1.09 18,799 32.12 0.0011
2026-05-27 2025-12-31 13F/A-1 A10 NETWORKS COM 002121101 804,350 48,874 6.47 14,229 3.77 0.0008
2026-02-13 2025-12-31 13F A10 NETWORKS COM 002121101 804,350 48,874 14,229 0.0008
2026-05-27 2025-09-30 13F/A-1 A10 NETWORKS COM 002121101 755,476 -291,943 -27.87 13,712 -32.35 0.0008
2025-11-14 2025-09-30 13F A10 NETWORKS COM 002121101 755,476 -291,943 13,712 0.0008
2025-08-15 2025-06-30 13F A10 NETWORKS COM 002121101 1,047,419 -437,322 -29.45 20,268 -16.46 0.0013
2025-05-15 2025-03-31 13F A10 NETWORKS COM 002121101 1,484,741 333,570 28.98 24,261 14.54 0.0017
2025-05-15 2024-12-31 13F/A-1 A10 NETWORKS COM 002121101 1,151,171 -1,114,435 -49.19 21,182 -35.26 0.0015
2025-02-14 2024-12-31 13F A10 NETWORKS COM 002121101 1,151,171 -1,114,435 21,182 0.0015
2025-05-14 2024-09-30 13F/A-2 A10 NETWORKS COM 002121101 2,265,606 232,059 11.41 32,715 16.16 0.0024
2025-02-14 2024-09-30 13F/A-1 A10 NETWORKS COM 002121101 2,265,606 232,059 32,715 0.0024
2024-11-14 2024-09-30 13F A10 NETWORKS COM 002121101 2,265,606 232,059 32,715 0.0003
2025-05-14 2024-06-30 13F/A-2 A10 NETWORKS COM 002121101 2,033,547 706,274 53.21 28,165 55.00 0.0022
2024-10-17 2024-06-30 13F/A-1 A10 NETWORKS COM 002121101 2,033,547 706,274 28,165 0.0022
2024-08-14 2024-06-30 13F A10 NETWORKS COM 002121101 2,033,547 706,274 28,165 0.0022
2024-10-17 2024-03-31 13F/A-2 A10 NETWORKS COM 002121101 1,327,273 -270,550 -16.93 18,170 -13.65 0.0015
2024-08-16 2024-03-31 13F/A-1 A10 NETWORKS COM 002121101 1,327,273 -270,550 18,170 0.0002
2024-05-15 2024-03-31 13F A10 NETWORKS COM 002121101 1,327,273 -270,550 18,170 0.0015
2024-08-16 2023-12-31 13F/A-1 A10 NETWORKS COM 002121101 1,597,823 -213,409 -11.78 21,043 -22.70 0.0019
2024-02-13 2023-12-31 13F A10 NETWORKS COM 002121101 1,597,823 -213,409 21,043 0.0019
2023-11-15 2023-09-30 13F A10 NETWORKS COM 002121101 1,811,232 415,424 29.76 27,223 33.68 0.0028
2023-08-14 2023-06-30 13F A10 NETWORKS COM 002121101 1,395,808 118,471 9.27 20,365 2.93 0.0020
2023-05-15 2023-03-31 13F A10 NETWORKS COM 002121101 1,277,337 230,140 21.98 19,786 13.62 0.0021
2023-02-14 2022-12-31 13F A10 NETWORKS COM 002121101 1,047,197 306,759 41.43 17,415 77.22 0.0020
2022-11-14 2022-09-30 13F A10 NETWORKS COM 002121101 740,438 134,404 22.18 9,826 12.75 0.0013
2022-10-27 2022-06-30 13F/A-1 A10 NETWORKS COM 002121101 606,034 404,393 200.55 8,715 209.92 0.0011
2022-08-15 2022-06-30 13F A10 NETWORKS COM 002121101 606,034 404,393 8,715 0.0002
2022-10-27 2022-03-31 13F/A-1 A10 NETWORKS COM 002121101 201,641 72,653 56.33 2,812 31.52 0.0004
2022-05-13 2022-03-31 13F A10 NETWORKS COM 002121101 201,641 72,653 2,812 0.0004
2022-02-14 2021-12-31 13F A10 NETWORKS COM 002121101 128,988 -247,465 -65.74 2,138 -57.86 0.0003
2021-11-15 2021-09-30 13F A10 NETWORKS COM 002121101 376,453 59,357 18.72 5,074 42.09 0.0007
2021-08-23 2021-06-30 13F/A-1 A10 NETWORKS COM 002121101 317,096 290,676 1,100.21 3,571 1,305.91 0.0005
2021-08-16 2021-06-30 13F A10 NETWORKS COM 002121101 317,096 290,676 3,571 0.0001
2021-05-17 2021-03-31 13F A10 NETWORKS COM 002121101 26,420 -336,155 -92.71 254 -92.90 0.0000
2021-02-16 2020-12-31 13F A10 NETWORKS COM 002121101 362,575 348,063 2,398.45 3,575 3,744.09 0.0006
2020-11-13 2020-09-30 13F A10 NETWORKS COM 002121101 14,512 -31,382 -68.38 93 -70.29 0.0000
2020-08-14 2020-06-30 13F A10 NETWORKS COM 002121101 45,894 -25,104 -35.36 313 -29.02 0.0001
2020-05-26 2020-03-31 13F/A-1 A10 NETWORKS COM 002121101 70,998 -1,802 -2.48 441 -11.80 0.0001
2020-05-15 2020-03-31 13F A10 NETWORKS COM 002121101 70,998 -1,802 441 33.8780
2020-02-14 2019-12-31 13F A10 NETWORKS COM 002121101 72,800 -36,302 -33.27 500 -34.04 0.0001
2019-11-14 2019-09-30 13F A10 NETWORKS COM 002121101 109,102 97,613 849.62 758 859.49 0.0002
2019-08-14 2019-06-30 13F A10 NETWORKS COM 002121101 11,489 -95,677 -89.28 79 -89.62 0.0000
2019-05-15 2019-03-31 13F A10 NETWORKS COM 002121101 107,166 -1,318 -1.21 761 12.57 0.0002
2019-02-14 2018-12-31 13F A10 NETWORKS COM 002121101 108,484 -100,420 -48.07 676 -46.81 0.0002
2019-04-23 2018-09-30 13F/A-2 A10 NETWORKS COM 002121101 208,904 -64,523 -23.60 1,271 -25.41 0.0003
2018-11-20 2018-09-30 13F/A-1 A10 NETWORKS COM 002121101 208,904 0 1,271 0.0003
2018-11-14 2018-09-30 13F A10 NETWORKS COM 002121101 208,904 -64,523 1,271
2019-04-23 2018-06-30 13F/A-1 A10 NETWORKS COM 002121101 273,427 91,960 50.68 1,704 61.36 0.0005
2018-08-14 2018-06-30 13F A10 NETWORKS COM 002121101 273,427 91,960 1,704
2019-04-23 2018-03-31 13F/A-1 A10 NETWORKS COM 002121101 181,467 -96,425 -34.70 1,056 -50.77 0.0003
2018-05-14 2018-03-31 13F A10 NETWORKS COM 002121101 181,467 -96,425 1,056
2019-04-23 2017-12-31 13F/A-1 A10 NETWORKS COM 002121101 277,892 161,000 137.73 2,145 142.65 0.0006
2018-02-14 2017-12-31 13F A10 NETWORKS COM 002121101 277,892 161,000 2,145
2017-11-14 2017-09-30 13F A10 NETWORKS COM 002121101 116,892 -165,346 -58.58 884 -62.89 0.0003
2017-08-11 2017-06-30 13F A10 NETWORKS COM 002121101 282,238 -80,538 -22.20 2,382 -28.23 0.0007
2017-05-22 2017-03-31 13F/A-1 A10 NETWORKS COM 002121101 362,776 -58,090 -13.80 3,319 -5.09 0.0010
2017-05-12 2017-03-31 13F A10 NETWORKS COM 002121101 362,776 3,319
2017-02-22 2016-12-31 13F/A-1 A10 NETWORKS COM 002121101 420,866 149,516 55.10 3,497 20.54 0.0011
2017-02-13 2016-12-31 13F A10 NETWORKS COM 002121101 420,866 3,497
2016-11-10 2016-09-30 13F A10 NETWORKS COM 002121101 271,350 104,667 62.79 2,901 169.11 0.0010
2016-08-12 2016-06-30 13F A10 NETWORKS COM 002121101 166,683 119,682 254.64 1,078 287.77 0.0004
2016-05-12 2016-03-31 13F A10 NETWORKS COM 002121101 47,001 -264,847 -84.93 278 -86.41 0.0001
2016-02-09 2015-12-31 13F A10 NETWORKS COM 002121101 311,848 -157,590 -33.57 2,046 -27.27 0.0007
2016-02-08 2015-09-30 13F/A-1 A10 NETWORKS COM 002121101 469,438 446,471 1,943.97 2,813 1,800.68 0.0010
2015-11-09 2015-09-30 13F A10 NETWORKS COM 002121101 469,438 2,813
2015-08-12 2015-06-30 13F A10 NETWORKS COM 002121101 22,967 2,422 11.79 148 66.29 0.0001
2015-05-14 2015-03-31 13F A10 NETWORKS COM 002121101 20,545 -7,474 -26.67 89 -27.05 0.0000
2015-02-13 2014-12-31 13F A10 NETWORKS COM 002121101 28,019 15,635 126.25 122 8.93 0.0000
2014-12-16 2014-09-30 13F/A-1 A10 NETWORKS COM 002121101 12,384 -354,861 -96.63 112 -97.71 0.0000
2014-11-14 2014-09-30 13F A10 NETWORKS COM 002121101 12,384 112
2014-08-12 2014-06-30 13F A10 NETWORKS COM 002121101 367,245 367,245 4,885 0.0084
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.