Arista Networks, Inc.
MX ˙ BMV ˙ US0404132054
SecurityMX:ANET / Arista Networks, Inc.
InstitutionAsset Management One Co., Ltd.
Latest Disclosed Ownership597,416 shares
Latest Disclosed Value $ 73,350,736
Asset Management One Co., Ltd. reports 3.02% decrease in ownership of ANET / Arista Networks, Inc.

On May 8, 2026 - Asset Management One Co., Ltd. filed a 13F-HR form disclosing ownership of 597,416 shares of Arista Networks, Inc. (MX:ANET) valued at $73,350,736 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 615,995 shares of Arista Networks, Inc.. This represents a change in shares of -3.02% during the quarter.

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)
2026-05-08 2026-03-31 13F ARISTA NETWORKS COM SHS 040413205 597,416 -18,579 -3.02 73,351 -10.85 0.2163
2026-01-27 2025-12-31 13F ARISTA NETWORKS COM SHS 040413205 615,995 105,902 20.76 82,280 10.70 0.2288
2025-10-22 2025-09-30 13F ARISTA NETWORKS COM SHS 040413205 510,093 -1,723 -0.34 74,326 41.94 0.2153
2025-07-31 2025-06-30 13F ARISTA NETWORKS COM SHS 040413205 511,816 18,744 3.80 52,364 37.07 0.1642
2025-04-23 2025-03-31 13F ARISTA NETWORKS COM SHS 040413205 493,072 9,242 1.91 38,203 -30.14 0.1321
2025-01-30 2024-12-31 13F ARISTA NETWORKS COM SHS 040413205 483,830 356,647 280.42 54,687 12.03 0.1879
2024-10-30 2024-09-30 13F ARISTA NETWORKS COM 040413106 127,183 2,249 1.80 48,815 11.49 0.1737
2024-07-18 2024-06-30 13F ARISTA NETWORKS COM 040413106 124,934 2,460 2.01 43,787 23.29 0.1675
2024-05-02 2024-03-31 13F ARISTA NETWORKS COM 040413106 122,474 -3,410 -2.71 35,515 19.06 0.1369
2024-01-24 2023-12-31 13F ARISTA NETWORKS COM 040413106 125,884 9,122 7.81 29,831 38.90 0.1201
2023-10-19 2023-09-30 13F ARISTA NETWORKS COM 040413106 116,762 3,506 3.10 21,476 17.01 0.0956
2023-07-31 2023-06-30 13F ARISTA NETWORKS COM 040413106 113,256 6,146 5.74 18,354 2.09 0.0777
2023-04-25 2023-03-31 13F ARISTA NETWORKS COM 040413106 107,110 -10,457 -8.89 17,979 25.49 0.0815
2023-02-06 2022-12-31 13F ARISTA NETWORKS COM 040413106 117,567 -6,407 -5.17 14,327 2.37 0.0698
2022-11-04 2022-09-30 13F ARISTA NETWORKS COM 040413106 123,974 182 0.15 13,995 20.60 0.0712
2022-07-29 2022-06-30 13F ARISTA NETWORKS COM 040413106 123,792 12,794 11.53 11,604 -24.78 0.0545
2022-05-13 2022-03-31 13F ARISTA NETWORKS COM 040413106 110,998 6,181 5.90 15,426 1.05 0.0602
2022-02-09 2021-12-31 13F ARISTA NETWORKS COM 040413106 104,817 78,481 298.00 15,265 68.67 0.0532
2021-11-02 2021-09-30 13F ARISTA NETWORKS COM 040413106 26,336 473 1.83 9,050 -3.42 0.0347
2021-08-03 2021-06-30 13F ARISTA NETWORKS COM 040413106 25,863 -58 -0.22 9,370 19.74 0.0349
2021-05-14 2021-03-31 13F ARISTA NETWORKS COM 040413106 25,921 -3,003 -10.38 7,825 -5.93 0.0311
2021-02-12 2020-12-31 13F ARISTA NETWORKS COM 040413106 28,924 366 1.28 8,318 40.77 0.0343
2020-11-13 2020-09-30 13F ARISTA NETWORKS COM 040413106 28,558 -91 -0.32 5,909 -1.78 0.0272
2020-08-14 2020-06-30 13F ARISTA NETWORKS COM 040413106 28,649 904 3.26 6,016 7.01 0.0296
2020-05-14 2020-03-31 13F ARISTA NETWORKS COM 040413106 27,745 -15 -0.05 5,622 -0.43 0.0328
2020-02-14 2019-12-31 13F ARISTA NETWORKS COM 040413106 27,760 -112 -0.40 5,646 -15.20 0.0254
2019-11-14 2019-09-30 13F ARISTA NETWORKS COM 040413106 27,872 412 1.50 6,658 -6.62 0.0321
2019-08-14 2019-06-30 13F ARISTA NETWORKS COM 040413106 27,460 2,905 11.83 7,130 -7.69 0.0350
2019-05-15 2019-03-31 13F ARISTA NETWORKS COM 040413106 24,555 -57,221 -69.97 7,724 -55.09 0.0418
2019-02-13 2018-12-31 13F ARISTA NETWORKS COM 040413106 81,776 -3,303 -3.88 17,198 -23.95 0.0410
2018-11-14 2018-09-30 13F ARISTA NETWORKS COM 040413106 85,079 -2,298 -2.63 22,615 0.50 0.0464
2018-08-14 2018-06-30 13F ARISTA NETWORKS COM 040413106 87,377 16,633 23.51 22,502 24.59 0.0492
2018-05-14 2018-03-31 13F ARISTA NETWORKS COM 040413106 70,744 1,478 2.13 18,061 10.58 0.0407
2018-02-14 2017-12-31 13F ARISTA NETWORKS COM 040413106 69,266 -4,524 -6.13 16,333 16.86 0.0360
2017-11-14 2017-09-30 13F ARISTA NETWORKS COM 040413106 73,790 5,365 7.84 13,977 36.37 0.0328
2017-08-14 2017-06-30 13F ARISTA NETWORKS COM 040413106 68,425 68,425 10,249 0.0262
2016-05-05 2016-03-31 13F ARISTA NETWORKS Com 040413106 0 0 0 0.0000
2016-01-28 2015-12-31 13F ARISTA NETWORKS Com 040413106 0 -3,178 -100.00 0 -100.00
2015-11-12 2015-09-30 13F ARISTA NETWORKS Com 040413106 3,178 -5,167 -61.92 194 -71.43 0.0030
2015-08-06 2015-06-30 13F ARISTA NETWORKS Com 040413106 8,345 8,345 679 0.0094
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.