Arista Networks, Inc.
MX ˙ BMV ˙ US0404132054
SecurityMX:ANET / Arista Networks, Inc.
InstitutionFirst Trust Advisors Lp
Latest Disclosed Ownership4,328,274 shares
Latest Disclosed Value $ 531,425,471
First Trust Advisors Lp reports 13.84% increase in ownership of ANET / Arista Networks, Inc.

On May 13, 2026 - First Trust Advisors Lp filed a 13F-HR form disclosing ownership of 4,328,274 shares of Arista Networks, Inc. (MX:ANET) valued at $531,425,471 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 3,801,901 shares of Arista Networks, Inc.. This represents a change in shares of 13.84% 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)
2026-05-13 2026-03-31 13F ARISTA NETWORKS COM SHS 040413205 4,328,274 526,373 13.84 531,425 6.68 0.3787
2026-02-13 2025-12-31 13F ARISTA NETWORKS COM SHS 040413205 3,801,901 -76,240 -1.97 498,163 -11.84 0.3620
2025-11-12 2025-09-30 13F ARISTA NETWORKS COM SHS 040413205 3,878,141 -1,408,588 -26.64 565,084 4.47 0.4199
2025-08-13 2025-06-30 13F ARISTA NETWORKS COM SHS 040413205 5,286,729 95,149 1.83 540,885 34.47 0.4350
2025-05-14 2025-03-31 13F ARISTA NETWORKS COM SHS 040413205 5,191,580 -303,094 -5.52 402,244 -33.77 0.3563
2025-02-13 2024-12-31 13F ARISTA NETWORKS COM SHS 040413205 5,494,674 4,354,298 381.83 607,326 38.75 0.5354
2024-11-13 2024-09-30 13F ARISTA NETWORKS COM 040413106 1,140,376 -323,890 -22.12 437,699 -14.71 0.4170
2024-08-13 2024-06-30 13F ARISTA NETWORKS COM 040413106 1,464,266 174,492 13.53 513,196 37.21 0.5232
2024-05-13 2024-03-31 13F ARISTA NETWORKS COM 040413106 1,289,774 -167,666 -11.50 374,009 8.96 0.3796
2024-02-13 2023-12-31 13F ARISTA NETWORKS COM 040413106 1,457,440 -189,847 -11.52 343,242 13.29 0.3745
2023-11-13 2023-09-30 13F ARISTA NETWORKS COM 040413106 1,647,287 -82,246 -4.76 302,985 8.10 0.3591
2023-08-14 2023-06-30 13F ARISTA NETWORKS COM 040413106 1,729,533 133,088 8.34 280,288 4.59 0.3187
2023-05-15 2023-03-31 13F ARISTA NETWORKS COM 040413106 1,596,445 -122,530 -7.13 267,979 28.44 0.3095
2023-02-09 2022-12-31 13F ARISTA NETWORKS COM 040413106 1,718,975 -383,585 -18.24 208,642 -12.10 0.2481
2022-11-14 2022-09-30 13F ARISTA NETWORKS COM 040413106 2,102,560 -387,465 -15.56 237,358 1.69 0.3077
2022-08-12 2022-06-30 13F ARISTA NETWORKS COM 040413106 2,490,025 -434,676 -14.86 233,415 -42.58 0.2882
2022-05-13 2022-03-31 13F ARISTA NETWORKS COM 040413106 2,924,701 -731,156 -20.00 406,475 -22.65 0.4158
2022-02-08 2021-12-31 13F ARISTA NETWORKS COM 040413106 3,655,857 2,896,705 381.57 525,529 101.45 0.5112
2021-11-15 2021-09-30 13F ARISTA NETWORKS COM 040413106 759,152 -474,182 -38.45 260,875 -41.62 0.2805
2021-10-12 2021-06-30 13F/A-1 ARISTA NETWORKS COM 040413106 1,233,334 -329,671 -21.09 446,849 -5.30 0.4837
2021-08-16 2021-06-30 13F ARISTA NETWORKS COM 040413106 1,233,334 -329,671 446,849 0.4609
2021-05-14 2021-03-31 13F ARISTA NETWORKS COM 040413106 1,563,005 113,018 7.79 471,856 11.99 0.5714
2021-02-02 2020-12-31 13F ARISTA NETWORKS COM 040413106 1,449,987 -152,857 -9.54 421,323 27.03 0.5583
2020-11-05 2020-09-30 13F ARISTA NETWORKS COM 040413106 1,602,844 143,594 9.84 331,677 8.22 0.5312
2020-07-22 2020-06-30 13F ARISTA NETWORKS COM 040413106 1,459,250 539,240 58.61 306,486 64.47 0.5312
2020-05-06 2020-03-31 13F ARISTA NETWORKS COM 040413106 920,010 -60,377 -6.16 186,348 -6.55 0.4222
2020-02-03 2019-12-31 13F ARISTA NETWORKS COM 040413106 980,387 107,988 12.38 199,411 -4.33 0.3405
2019-11-04 2019-09-30 13F ARISTA NETWORKS COM 040413106 872,399 -271,453 -23.73 208,434 -29.81 0.3924
2019-07-30 2019-06-30 13F ARISTA NETWORKS COM 040413106 1,143,852 396,782 53.11 296,967 26.41 0.5599
2019-06-19 2019-03-31 13F/A-1 ARISTA NETWORKS COM 040413106 747,070 -100,884 -11.90 234,924 31.49 0.4672
2019-05-09 2019-03-31 13F ARISTA NETWORKS COM 040413106 747,070 -100,884 234,924
2019-02-07 2018-12-31 13F ARISTA NETWORKS COM 040413106 847,954 -101,832 -10.72 178,664 -29.24 0.4236
2018-10-25 2018-09-30 13F ARISTA NETWORKS COM 040413106 949,786 -50,916 -5.09 252,510 -2.00 0.4702
2018-08-02 2018-06-30 13F ARISTA NETWORKS COM 040413106 1,000,702 73,288 7.90 257,671 8.83 0.5343
2018-04-23 2018-03-31 13F ARISTA NETWORKS COM 040413106 927,414 23,135 2.56 236,769 11.14 0.5437
2018-02-08 2017-12-31 13F ARISTA NETWORKS COM 040413106 904,279 140,944 18.46 213,030 47.19 0.5072
2017-10-24 2017-09-30 13F ARISTA NETWORKS COM 040413106 763,335 -37,856 -4.72 144,736 20.60 0.3723
2017-08-02 2017-06-30 13F ARISTA NETWORKS COM 040413106 801,191 9,596 1.21 120,010 14.62 0.3203
2017-05-02 2017-03-31 13F ARISTA NETWORKS COM 040413106 791,595 -34,414 -4.17 104,704 30.99 0.2902
2017-02-06 2016-12-31 13F ARISTA NETWORKS COM 040413106 826,009 138,207 20.09 79,933 36.60 0.2379
2016-11-01 2016-09-30 13F ARISTA NETWORKS COM 040413106 687,802 87,561 14.59 58,518 51.43 0.1747
2016-08-04 2016-06-30 13F ARISTA NETWORKS COM 040413106 600,241 -109,639 -15.44 38,644 -13.73 0.1217
2016-05-10 2016-03-31 13F ARISTA NETWORKS COM 040413106 709,880 -205,398 -22.44 44,793 -37.13 0.1439
2016-05-04 2015-12-31 13F/A-1 ARISTA NETWORKS COM 040413106 915,278 687,381 301.62 71,245 410.90 0.1849
2016-02-03 2015-12-31 13F ARISTA NETWORKS COM 040413106 915,278 71,245
2015-11-05 2015-09-30 13F ARISTA NETWORKS COM 040413106 227,897 183,352 411.61 13,945 283.00 0.0404
2015-08-04 2015-06-30 13F ARISTA NETWORKS COM 040413106 44,545 10,333 30.20 3,641 50.89 0.0094
2015-05-04 2015-03-31 13F ARISTA NETWORKS COM 040413106 34,212 -57 -0.17 2,413 15.90 0.0071
2015-02-13 2014-12-31 13F ARISTA NETWORKS COM 040413106 34,269 144 0.42 2,082 -30.92 0.0070
2014-11-12 2014-09-30 13F ARISTA NETWORKS COM 040413106 34,125 34,125 3,014 0.0119
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.