Arista Networks, Inc.
MX ˙ BMV ˙ US0404132054
SecurityMX:ANET / Arista Networks, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership1,780,170 shares
Latest Disclosed Value $ 218,569,141
Rhumbline Advisers reports 0.89% decrease in ownership of ANET / Arista Networks, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 1,780,170 shares of Arista Networks, Inc. (MX:ANET) valued at $218,569,141 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,796,216 shares of Arista Networks, Inc.. This represents a change in shares of -0.89% 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)
2026-05-12 2026-03-31 13F ARISTA NETWORKS INC COM COM 040413205 1,780,170 -16,046 -0.89 218,569 -7.13 0.1870
2026-02-13 2025-12-31 13F ARISTA NETWORKS INC COM COM 040413205 1,796,216 -56,276 -3.04 235,358 -12.81 0.1903
2025-11-06 2025-09-30 13F ARISTA NETWORKS INC COM COM 040413205 1,852,492 -31,776 -1.69 269,926 40.02 0.2168
2025-08-12 2025-06-30 13F ARISTA NETWORKS INC COM COM 040413205 1,884,268 -24,286 -1.27 192,779 30.37 0.1651
2025-05-29 2025-03-31 13F/A-1 ARISTA NETWORKS INC COM COM 040413205 1,908,554 38,366 2.05 147,875 -28.46 0.1383
2025-04-08 2025-03-31 13F ARISTA NETWORKS INC COM COM 040413205 1,908,554 38,366 147,875 0.1383
2025-05-29 2024-12-31 13F/A-1 ARISTA NETWORKS INC COM COM 040413205 1,870,188 1,397,122 295.33 206,712 13.85 0.1849
2025-01-30 2024-12-31 13F ARISTA NETWORKS INC COM COM 040413205 1,870,188 1,397,122 206,712 0.1849
2024-11-12 2024-09-30 13F ARISTA NETWORKS INC COM COM 040413106 473,066 -8,831 -1.83 181,572 7.51 0.1638
2024-08-01 2024-06-30 13F ARISTA NETWORKS INC COM COM 040413106 481,897 8,326 1.76 168,895 22.99 0.1587
2024-05-09 2024-03-31 13F ARISTA NETWORKS INC COM COM 040413106 473,571 11,626 2.52 137,326 26.23 0.1319
2024-02-08 2023-12-31 13F ARISTA NETWORKS INC COM COM 040413106 461,945 -1,037 -0.22 108,793 27.76 0.1140
2023-11-09 2023-09-30 13F ARISTA NETWORKS INC COM COM 040413106 462,982 3,298 0.72 85,156 14.31 0.0988
2023-08-08 2023-06-30 13F ARISTA NETWORKS INC COM COM 040413106 459,684 -21,382 -4.44 74,496 93,020.00 0.0834
2023-05-11 2023-03-31 13F ARISTA NETWORKS INC COM COM 040413106 481,066 28,637 6.33 81 -99.85 0.0996
2023-02-14 2022-12-31 13F ARISTA NETWORKS INC COM COM 040413106 452,429 22,804 5.31 54,902 13.20 0.0738
2022-11-10 2022-09-30 13F ARISTA NETWORKS INC COM COM 040413106 429,625 20,729 5.07 48,500 26.53 0.0722
2022-08-11 2022-06-30 13F ARISTA NETWORKS INC COM COM 040413106 408,896 43,126 11.79 38,330 -24.60 0.0559
2022-05-12 2022-03-31 13F ARISTA NETWORKS INC COM COM 040413106 365,770 -8,352 -2.23 50,835 -5.48 0.0654
2022-02-10 2021-12-31 13F ARISTA NETWORKS INC COM COM 040413106 374,122 282,602 308.79 53,780 71.00 0.0659
2021-11-12 2021-09-30 13F ARISTA NETWORKS INC COM COM 040413106 91,520 1,729 1.93 31,450 -3.33 0.0426
2021-08-05 2021-06-30 13F ARISTA NETWORKS INC COM COM 040413106 89,791 -2,939 -3.17 32,532 16.21 0.0427
2021-05-06 2021-03-31 13F ARISTA NETWORKS INC COM COM 040413106 92,730 -4,774 -4.90 27,994 -1.19 0.0380
2021-02-10 2020-12-31 13F ARISTA NETWORKS INC COM COM 040413106 97,504 -2,053 -2.06 28,332 37.53 0.0391
2020-11-12 2020-09-30 13F ARISTA NETWORKS INC COM COM 040413106 99,557 -2,372 -2.33 20,601 -3.77 0.0323
2020-08-13 2020-06-30 13F ARISTA NETWORKS INC COM COM 040413106 101,929 -2,663 -2.55 21,408 1.05 0.0357
2020-05-06 2020-03-31 13F ARISTA NETWORKS INC COM COM 040413106 104,592 4,148 4.13 21,185 3.70 0.0444
2020-02-05 2019-12-31 13F ARISTA NETWORKS INC COM COM 040413106 100,444 3,632 3.75 20,430 -11.67 0.0342
2019-10-23 2019-09-30 13F ARISTA NETWORKS INC COM COM 040413106 96,812 1,050 1.10 23,130 -6.97 0.0423
2019-08-14 2019-06-30 13F ARISTA NETWORKS INC COM COM 040413106 95,762 5,673 6.30 24,862 -12.24 0.0467
2019-05-01 2019-03-31 13F ARISTA NETWORKS INC COM COM 040413106 90,089 -2,157 -2.34 28,329 45.76 0.0549
2019-01-31 2018-12-31 13F ARISTA NETWORKS INC COM COM 040413106 92,246 -2,316 -2.45 19,436 -22.69 0.0423
2018-11-07 2018-09-30 13F ARISTA NETWORKS INC COM COM 040413106 94,562 34,070 56.32 25,140 61.40 0.0486
2018-08-06 2018-06-30 13F ARISTA NETWORKS INC COM COM 040413106 60,492 3,723 6.56 15,576 7.47 0.0314
2018-05-02 2018-03-31 13F ARISTA NETWORKS INC COM COM 040413106 56,769 -2,461 -4.15 14,493 3.87 0.0303
2018-02-09 2017-12-31 13F ARISTA NETWORKS INC COM COM 040413106 59,230 -1,020 -1.69 13,953 22.14 0.0283
2017-11-06 2017-09-30 13F ARISTA NETWORKS INC COM COM 040413106 60,250 -2,274 -3.64 11,424 21.99 0.0248
2017-08-02 2017-06-30 13F ARISTA NETWORKS INC COM COM 040413106 62,524 13,772 28.25 9,365 45.24 0.0214
2017-05-02 2017-03-31 13F ARISTA NETWORKS INC COM COM 040413106 48,752 5,899 13.77 6,448 55.49 0.0151
2017-01-27 2016-12-31 13F ARISTA NETWORKS INC COM COM 040413106 42,853 3,792 9.71 4,147 24.80 0.0105
2016-11-08 2016-09-30 13F ARISTA NETWORKS INC COM COM 040413106 39,061 1,968 5.31 3,323 39.15 0.0092
2016-08-11 2016-06-30 13F ARISTA NETWORKS INC COM COM 040413106 37,093 6,942 23.02 2,388 25.49 0.0071
2016-05-02 2016-03-31 13F ARISTA NETWORKS INC COM COM 040413106 30,151 -340 -1.12 1,903 -19.81 0.0059
2016-02-03 2015-12-31 13F ARISTA NETWORKS INC COM COM 040413106 30,491 520 1.74 2,373 29.39 0.0076
2015-11-04 2015-09-30 13F ARISTA NETWORKS INC COM COM 040413106 29,971 1,865 6.64 1,834 -20.16 0.0062
2015-08-04 2015-06-30 13F ARISTA NETWORKS INC COM COM 040413106 28,106 23,766 547.60 2,297 650.65 0.0073
2015-05-12 2015-03-31 13F ARISTA NETWORKS INC COM COM 040413106 4,340 500 13.02 306 31.33 0.0009
2015-02-06 2014-12-31 13F ARISTA NETWORKS INC COM COM 040413106 3,840 3,840 233 0.0007
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.