Arista Networks, Inc.
US ˙ NYSE ˙ US0404132054

SecurityANET / Arista Networks, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership2,135,435 shares
Latest Disclosed Value $ 262,062,744
Dimensional Fund Advisors Lp reports 2.19% increase in ownership of ANET / Arista Networks, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 2,135,435 shares of Arista Networks, Inc. (US:ANET) valued at $262,188,709 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 2,089,692 shares of Arista Networks, Inc.. This represents a change in shares of 2.19% during the quarter. The current value of the position is $372,355,801 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)
2026-05-07 2026-03-31 13F ARISTA NETWORKS COM SHS 040413205 2,135,435 45,743 2.19 262,063 -4.30 0.0544
2026-02-12 2025-12-31 13F ARISTA NETWORKS COM SHS 040413205 2,089,692 -20,767 -0.98 273,839 -10.94 0.0574
2025-11-12 2025-09-30 13F ARISTA NETWORKS COM SHS 040413205 2,110,459 -88,212 -4.01 307,465 36.72 0.0660
2025-08-12 2025-06-30 13F ARISTA NETWORKS COM SHS 040413205 2,198,671 -70,664 -3.11 224,883 27.89 0.0521
2025-05-13 2025-03-31 13F ARISTA NETWORKS COM SHS 040413205 2,269,335 28,251 1.26 175,836 -29.02 0.0437
2025-02-13 2024-12-31 13F ARISTA NETWORKS COM SHS 040413205 2,241,084 1,665,099 289.09 247,723 12.06 0.0595
2024-11-07 2024-09-30 13F ARISTA NETWORKS COM 040413106 575,985 -20,235 -3.39 221,057 5.79 0.0536
2024-08-09 2024-06-30 13F ARISTA NETWORKS COM 040413106 596,220 32,480 5.76 208,962 27.83 0.0546
2024-05-10 2024-03-31 13F ARISTA NETWORKS COM 040413106 563,740 -28,601 -4.83 163,473 17.18 0.0443
2024-02-07 2023-12-31 13F ARISTA NETWORKS COM 040413106 592,341 -41,679 -6.57 139,509 19.62 0.0407
2023-11-09 2023-09-30 13F ARISTA NETWORKS COM 040413106 634,020 -7,992 -1.24 116,623 12.10 0.0382
2023-08-09 2023-06-30 13F ARISTA NETWORKS COM 040413106 642,012 -110,735 -14.71 104,037 -17.65 0.0332
2023-05-12 2023-03-31 13F ARISTA NETWORKS COM 040413106 752,747 -295,658 -28.20 126,333 99,374.80 0.0426
2023-02-09 2022-12-31 13F ARISTA NETWORKS COM 040413106 1,048,405 -25,667 -2.39 127 -99.90 0.0376
2022-11-10 2022-09-30 13F ARISTA NETWORKS COM 040413106 1,074,072 -2,082 -0.19 121,263 20.21 0.0466
2022-08-12 2022-06-30 13F ARISTA NETWORKS COM 040413106 1,076,154 -185,017 -14.67 100,877 -42.45 0.0362
2022-05-13 2022-03-31 13F ARISTA NETWORKS COM 040413106 1,261,171 19,738 1.59 175,274 -1.78 0.0540
2022-02-09 2021-12-31 13F ARISTA NETWORKS COM 040413106 1,241,433 933,163 302.71 178,452 68.45 0.0540
2021-11-12 2021-09-30 13F ARISTA NETWORKS COM 040413106 308,270 -2,679 -0.86 105,938 -5.97 0.0341
2021-08-12 2021-06-30 13F ARISTA NETWORKS COM 040413106 310,949 -8,944 -2.80 112,661 16.66 0.0357
2021-05-14 2021-03-31 13F ARISTA NETWORKS COM 040413106 319,893 8,962 2.88 96,568 6.89 0.0319
2021-03-08 2020-12-31 13F/A-2 ARISTA NETWORKS COM 040413106 310,931 8,544 2.83 90,344 44.37 0.0326
2021-02-11 2020-12-31 13F ARISTA NETWORKS COM 040413106 310,931 8,544 90,344 32,627.4508
2020-11-12 2020-09-30 13F ARISTA NETWORKS COM 040413106 302,387 27,765 10.11 62,580 8.50 0.0265
2020-08-13 2020-06-30 13F ARISTA NETWORKS COM 040413106 274,622 5,568 2.07 57,675 5.83 0.0254
2020-05-14 2020-03-31 13F ARISTA NETWORKS COM 040413106 269,054 27,163 11.23 54,498 10.77 0.0284
2020-02-14 2019-12-31 13F ARISTA NETWORKS COM 040413106 241,891 59,119 32.35 49,200 12.66 0.0179
2019-11-12 2019-09-30 13F ARISTA NETWORKS COM 040413106 182,772 -11,533 -5.94 43,673 -13.42 0.0170
2019-08-13 2019-06-30 13F ARISTA NETWORKS COM 040413106 194,305 -23,439 -10.76 50,445 -26.33 0.0196
2019-08-12 2019-03-31 13F/A-2 ARISTA NETWORKS COM 040413106 217,744 1,461 0.68 68,471 50.26 0.0273
2019-05-10 2019-03-31 13F ARISTA NETWORKS COM 040413106 217,744 1,461 68,471
2019-02-26 2018-12-31 13F/A-1 ARISTA NETWORKS COM 040413106 216,283 -1,301 -0.60 45,567 -21.23 0.0206
2019-02-13 2018-12-31 13F ARISTA NETWORKS COM 040413106 216,283 -1,301 45,567
2018-11-13 2018-09-30 13F ARISTA NETWORKS COM 040413106 217,584 12,851 6.28 57,845 9.72 0.0220
2018-08-10 2018-06-30 13F ARISTA NETWORKS COM 040413106 204,733 1,779 0.88 52,719 1.75 0.0210
2018-05-11 2018-03-31 13F ARISTA NETWORKS COM 040413106 202,954 1,472 0.73 51,814 9.14 0.0216
2018-02-12 2017-12-31 13F ARISTA NETWORKS COM 040413106 201,482 -3,992 -1.94 47,473 21.86 0.0197
2017-11-13 2017-09-30 13F ARISTA NETWORKS COM 040413106 205,474 -6,150 -2.91 38,957 22.89 0.0170
2017-08-11 2017-06-30 13F ARISTA NETWORKS COM 040413106 211,624 858 0.41 31,700 13.71 0.0146
2017-05-12 2017-03-31 13F ARISTA NETWORKS COM 040413106 210,766 -504 -0.24 27,878 36.36 0.0133
2017-02-09 2016-12-31 13F ARISTA NETWORKS COM 040413106 211,270 -11,242 -5.05 20,445 7.99 0.0102
2016-11-10 2016-09-30 13F ARISTA NETWORKS COM 040413106 222,512 -385 -0.17 18,932 31.93 0.0102
2016-08-09 2016-06-30 13F ARISTA NETWORKS COM 040413106 222,897 8,066 3.75 14,350 5.86 0.0083
2016-05-13 2016-03-31 13F ARISTA NETWORKS COM 040413106 214,831 25,169 13.27 13,555 -8.19 0.0081
2016-02-10 2015-12-31 13F ARISTA NETWORKS COM 040413106 189,662 65,148 52.32 14,764 93.78 0.0092
2015-11-13 2015-09-30 13F ARISTA NETWORKS COM 040413106 124,514 124,514 7,619 0.0050
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.