Arista Networks, Inc.
MX ˙ BMV ˙ US0404132054
SecurityMX:ANET / Arista Networks, Inc.
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership66,740 shares
Latest Disclosed Value $ 8,194,337
Renaissance Technologies Llc reports 91.39% decrease in ownership of ANET / Arista Networks, Inc.

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 66,740 shares of Arista Networks, Inc. (MX:ANET) valued at $8,194,337 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 774,840 shares of Arista Networks, Inc.. This represents a change in shares of -91.39% 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)
2026-05-14 2026-03-31 13F ARISTA NETWORKS COM SHS 040413205 66,740 -708,100 -91.39 8,194 -91.93 0.0128
2026-02-12 2025-12-31 13F ARISTA NETWORKS COM SHS 040413205 774,840 89,600 13.08 101,527 1.68 0.1575
2025-11-13 2025-09-30 13F ARISTA NETWORKS COM SHS 040413205 685,240 6,340 0.93 99,846 43.75 0.1318
2025-08-13 2025-06-30 13F ARISTA NETWORKS COM SHS 040413205 678,900 -1,139,900 -62.67 69,458 -50.71 0.0924
2025-05-14 2025-03-31 13F ARISTA NETWORKS COM SHS 040413205 1,818,800 818,700 81.86 140,921 27.48 0.2133
2025-02-13 2024-12-31 13F ARISTA NETWORKS COM SHS 040413205 1,000,100 658,300 192.60 110,541 -15.74 0.1636
2024-11-13 2024-09-30 13F ARISTA NETWORKS COM 040413106 341,800 72,911 27.12 131,190 39.21 0.1973
2024-08-09 2024-06-30 13F ARISTA NETWORKS COM 040413106 268,889 134,389 99.92 94,240 241,541.03 0.1598
2024-05-13 2024-03-31 13F ARISTA NETWORKS COM 040413106 134,500 -113,300 -45.72 39 -32.76 0.0613
2024-02-13 2023-12-31 13F ARISTA NETWORKS COM 040413106 247,800 111,000 81.14 58 132.00 0.0903
2023-11-14 2023-09-30 13F ARISTA NETWORKS COM 040413106 136,800 -171,700 -55.66 25 -48.98 0.0429
2023-08-11 2023-06-30 13F ARISTA NETWORKS COM 040413106 308,500 308,500 50 0.0721
2023-05-12 2023-03-31 13F ARISTA NETWORKS COM 040413106 0 -564,700 -100.00 0 -100.00
2023-02-13 2022-12-31 13F ARISTA NETWORKS COM 040413106 564,700 -59,900 -9.59 69 -99.90 0.0938
2022-11-14 2022-09-30 13F ARISTA NETWORKS COM 040413106 624,600 -160,487 -20.44 70,511 -4.19 0.0998
2022-08-12 2022-06-30 13F ARISTA NETWORKS COM 040413106 785,087 672,287 596.00 73,594 369.44 0.0871
2022-05-13 2022-03-31 13F ARISTA NETWORKS COM 040413106 112,800 -152,900 -57.55 15,677 -58.95 0.0184
2022-02-11 2021-12-31 13F ARISTA NETWORKS COM 040413106 265,700 45,800 20.83 38,194 -49.46 0.0475
2021-11-12 2021-09-30 13F ARISTA NETWORKS COM 040413106 219,900 188,410 598.32 75,566 562.34 0.0976
2021-08-13 2021-06-30 13F ARISTA NETWORKS COM 040413106 31,490 -105,616 -77.03 11,409 -72.44 0.0142
2021-05-13 2021-03-31 13F ARISTA NETWORKS COM 040413106 137,106 -314,100 -69.61 41,391 -68.43 0.0515
2021-02-10 2020-12-31 13F ARISTA NETWORKS COM 040413106 451,206 -369,294 -45.01 131,107 -22.78 0.1424
2020-11-13 2020-09-30 13F ARISTA NETWORKS COM 040413106 820,500 -546,000 -39.96 169,786 -40.84 0.1695
2020-08-13 2020-06-30 13F ARISTA NETWORKS COM 040413106 1,366,500 353,200 34.86 287,006 39.84 0.2478
2020-05-14 2020-03-31 13F ARISTA NETWORKS COM 040413106 1,013,300 493,000 94.75 205,244 93.94 0.1993
2020-02-13 2019-12-31 13F ARISTA NETWORKS COM 040413106 520,300 197,000 60.93 105,829 37.01 0.0813
2019-11-13 2019-09-30 13F ARISTA NETWORKS COM 040413106 323,300 -168,700 -34.29 77,243 -39.53 0.0654
2019-08-12 2019-06-30 13F ARISTA NETWORKS COM 040413106 492,000 61,600 14.31 127,733 -5.62 0.1125
2019-05-14 2019-03-31 13F ARISTA NETWORKS COM 040413106 430,400 -329,500 -43.36 135,344 -15.47 0.1230
2019-02-12 2018-12-31 13F ARISTA NETWORKS COM 040413106 759,900 -159,900 -17.38 160,111 -34.53 0.1753
2018-11-13 2018-09-30 13F ARISTA NETWORKS COM 040413106 919,800 -173,900 -15.90 244,538 -13.17 0.2514
2018-08-13 2018-06-30 13F/A-1 ARISTA NETWORKS COM 040413106 1,093,700 227,500 26.26 281,617 27.35 0.3070
2018-08-13 2018-06-30 13F ARISTA NETWORKS COM 040413106 866,200 221,141
2018-05-14 2018-03-31 13F ARISTA NETWORKS COM 040413106 866,200 40,000 4.84 221,141 13.62 0.2418
2018-02-13 2017-12-31 13F ARISTA NETWORKS COM 040413106 826,200 150,000 22.18 194,636 51.81 0.2146
2017-11-13 2017-09-30 13F ARISTA NETWORKS COM 040413106 676,200 592,400 706.92 128,214 921.46 0.1509
2017-08-11 2017-06-30 13F ARISTA NETWORKS COM 040413106 83,800 -113,300 -57.48 12,552 -51.85 0.0160
2017-05-12 2017-03-31 13F ARISTA NETWORKS COM 040413106 197,100 -290,700 -59.59 26,070 -44.77 0.0364
2017-02-13 2016-12-31 13F ARISTA NETWORKS COM 040413106 487,800 168,600 52.82 47,204 73.81 0.0747
2016-11-14 2016-09-30 13F ARISTA NETWORKS COM 040413106 319,200 268,000 523.44 27,158 723.97 0.0480
2016-08-12 2016-06-30 13F ARISTA NETWORKS COM 040413106 51,200 -143,500 -73.70 3,296 -73.17 0.0063
2016-05-13 2016-03-31 13F ARISTA NETWORKS COM 040413106 194,700 117,000 150.58 12,286 103.14 0.0234
2016-02-11 2015-12-31 13F ARISTA NETWORKS COM 040413106 77,700 39,700 104.47 6,048 160.13 0.0132
2015-11-12 2015-09-30 13F ARISTA NETWORKS COM 040413106 38,000 38,000 -51.09 2,325 -61.56 0.0055
2015-05-13 2015-03-31 13F ARISTA NETWORKS COM 040413106 0 -65,400 -100.00 0 -100.00
2015-02-13 2014-12-31 13F ARISTA NETWORKS COM 040413106 65,400 65,400 3,974 0.0096
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.