Arista Networks, Inc.
MX ˙ BMV ˙ US0404132054
SecurityMX:ANET / Arista Networks, Inc.
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership1,448,819 shares
Latest Disclosed Value $ 189,838,754
Alliancebernstein L.p. reports 1.56% increase in ownership of ANET / Arista Networks, Inc.

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 1,448,819 shares of Arista Networks, Inc. (MX:ANET) valued at $189,838,754 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,426,632 shares of Arista Networks, Inc.. This represents a change in shares of 1.56% 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)
2026-05-15 2026-03-31 13F ARISTA NETWORKS COM SHS 040413205 1,448,819 22,187 1.56 189,839 1.56 0.0615
2026-02-17 2025-12-31 13F ARISTA NETWORKS COM SHS 040413205 1,426,632 -2,879,175 -66.87 186,932 -70.21 0.0590
2025-11-14 2025-09-30 13F ARISTA NETWORKS COM SHS 040413205 4,305,807 -6,019,949 -58.30 627,399 -40.61 0.1976
2025-08-14 2025-06-30 13F ARISTA NETWORKS COM SHS 040413205 10,325,756 -12,633,458 -55.03 1,056,428 -40.61 0.3446
2025-05-15 2025-03-31 13F ARISTA NETWORKS COM SHS 040413205 22,959,214 1,889,198 8.97 1,778,880 -23.62 0.6436
2025-02-12 2024-12-31 13F ARISTA NETWORKS COM SHS 040413205 21,070,016 14,454,822 218.51 2,328,869 -8.28 0.7904
2024-11-14 2024-09-30 13F ARISTA NETWORKS COM 040413106 6,615,194 -1,353,104 -16.98 2,539,044 -9.08 0.8528
2024-08-14 2024-06-30 13F ARISTA NETWORKS COM 040413106 7,968,298 1,220,315 18.08 2,792,729 42.72 0.9739
2024-05-14 2024-03-31 13F ARISTA NETWORKS COM 040413106 6,747,983 -717,383 -9.61 1,956,780 11.30 0.6924
2024-02-14 2023-12-31 13F ARISTA NETWORKS COM 040413106 7,465,366 78,982 1.07 1,758,168 29.41 0.6765
2023-11-14 2023-09-30 13F ARISTA NETWORKS COM 040413106 7,386,384 -1,878,697 -20.28 1,358,578 -9.52 0.5779
2023-08-15 2023-06-30 13F ARISTA NETWORKS COM 040413106 9,265,081 -286,693 -3.00 1,501,499 -6.35 0.6128
2023-05-15 2023-03-31 13F ARISTA NETWORKS COM 040413106 9,551,774 -671,619 -6.57 1,603,361 29.24 0.6870
2023-02-15 2022-12-31 13F ARISTA NETWORKS COM 040413106 10,223,393 -362,555 -3.42 1,240,609 3.81 0.5583
2022-11-15 2022-09-30 13F ARISTA NETWORKS COM 040413106 10,585,948 32,867 0.31 1,195,048 20.80 0.5786
2022-08-15 2022-06-30 13F ARISTA NETWORKS COM 040413106 10,553,081 1,156,548 12.31 989,246 -24.25 0.4518
2022-05-13 2022-03-31 13F ARISTA NETWORKS COM 040413106 9,396,533 1,021,950 12.20 1,305,930 8.48 0.5040
2022-02-14 2021-12-31 13F ARISTA NETWORKS COM 040413106 8,374,583 6,299,163 303.51 1,203,846 68.80 0.4256
2021-11-10 2021-09-30 13F ARISTA NETWORKS COM 040413106 2,075,420 590,608 39.78 713,197 32.57 0.2814
2021-07-30 2021-06-30 13F ARISTA NETWORKS COM 040413106 1,484,812 213,915 16.83 537,962 40.21 0.2160
2021-05-06 2021-03-31 13F ARISTA NETWORKS COM 040413106 1,270,897 536,680 73.10 383,671 79.84 0.1682
2021-02-08 2020-12-31 13F ARISTA NETWORKS COM 040413106 734,217 -445,489 -37.76 213,341 -12.61 0.1007
2020-11-12 2020-09-30 13F ARISTA NETWORKS COM 040413106 1,179,706 -92,708 -7.29 244,117 -8.65 0.1314
2020-08-13 2020-06-30 13F ARISTA NETWORKS COM 040413106 1,272,414 30,751 2.48 267,245 6.26 0.1570
2020-05-14 2020-03-31 13F ARISTA NETWORKS COM 040413106 1,241,663 -83,134 -6.28 251,499 -6.67 0.1803
2020-02-18 2019-12-31 13F ARISTA NETWORKS COM 040413106 1,324,797 -418,392 -24.00 269,464 -35.30 0.1531
2019-11-14 2019-09-30 13F ARISTA NETWORKS COM 040413106 1,743,189 -149,020 -7.88 416,483 -15.22 0.2593
2019-08-14 2019-06-30 13F ARISTA NETWORKS COM 040413106 1,892,209 -245,960 -11.50 491,255 -26.94 0.3052
2019-05-14 2019-03-31 13F ARISTA NETWORKS COM 040413106 2,138,169 22,926 1.08 672,369 50.86 0.4376
2019-02-13 2018-12-31 13F ARISTA NETWORKS COM 040413106 2,115,243 986,175 87.34 445,682 48.47 0.3309
2018-11-08 2018-09-30 13F ARISTA NETWORKS COM 040413106 1,129,068 331,941 41.64 300,174 46.25 0.1960
2018-08-13 2018-06-30 13F ARISTA NETWORKS COM 040413106 797,127 232,247 41.11 205,252 42.32 0.1429
2018-05-14 2018-03-31 13F ARISTA NETWORKS COM 040413106 564,880 -132,996 -19.06 144,214 -12.28 0.1043
2018-02-13 2017-12-31 13F ARISTA NETWORKS COM 040413106 697,876 -128,943 -15.60 164,406 4.87 0.1176
2017-11-13 2017-09-30 13F ARISTA NETWORKS COM 040413106 826,819 -197,310 -19.27 156,773 2.20 0.1174
2017-08-10 2017-06-30 13F ARISTA NETWORKS COM 040413106 1,024,129 -405,923 -28.39 153,404 -18.90 0.1187
2017-05-11 2017-03-31 13F ARISTA NETWORKS COM 040413106 1,430,052 -1,113,838 -43.78 189,153 -23.16 0.1506
2017-02-13 2016-12-31 13F ARISTA NETWORKS COM 040413106 2,543,890 -14,059 -0.55 246,172 13.11 0.2051
2016-11-10 2016-09-30 13F ARISTA NETWORKS COM 040413106 2,557,949 5,907 0.23 217,630 32.46 0.1837
2016-08-11 2016-06-30 13F ARISTA NETWORKS COM 040413106 2,552,042 960,594 60.36 164,300 63.61 0.1415
2016-05-13 2016-03-31 13F ARISTA NETWORKS COM 040413106 1,591,448 645,110 68.17 100,420 36.32 0.0854
2016-02-16 2015-12-31 13F/A-1 ARISTA NETWORKS COM 040413106 946,338 524,201 124.18 73,663 185.17 0.0627
2016-02-12 2015-12-31 13F ARISTA NETWORKS COM 040413106 946,338 57,906
2015-11-13 2015-09-30 13F ARISTA NETWORKS COM 040413106 422,137 403,344 2,146.25 25,831 1,581.71 0.0222
2015-08-14 2015-06-30 13F ARISTA NETWORKS COM 040413106 18,793 16,891 888.07 1,536 1,046.27 0.0013
2015-05-13 2015-03-31 13F ARISTA NETWORKS COM 040413106 1,902 -246,911 -99.24 134 -99.11 0.0001
2015-02-13 2014-12-31 13F ARISTA NETWORKS COM 040413106 248,813 63,923 34.57 15,118 -7.43 0.0126
2014-11-13 2014-09-30 13F ARISTA NETWORKS COM 040413106 184,890 70,653 61.85 16,331 129.14 0.0138
2014-08-13 2014-06-30 13F ARISTA NETWORKS COM 040413106 114,237 114,237 7,127 0.0060
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.