Arista Networks, Inc.
MX ˙ BMV ˙ US0404132054
SecurityMX:ANET / Arista Networks, Inc.
InstitutionWestpac Banking Corp
Latest Disclosed Ownership74,135 shares
Latest Disclosed Value $ 9,102,295
Westpac Banking Corp reports 12.24% decrease in ownership of ANET / Arista Networks, Inc.

On May 11, 2026 - Westpac Banking Corp filed a 13F-HR form disclosing ownership of 74,135 shares of Arista Networks, Inc. (MX:ANET) valued at $9,102,295 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 84,478 shares of Arista Networks, Inc.. This represents a change in shares of -12.24% 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)
2026-05-11 2026-03-31 13F ARISTA NETWORKS COM SHS 040413205 74,135 -10,343 -12.24 9,102 -17.77 0.3170
2026-02-10 2025-12-31 13F ARISTA NETWORKS COM SHS 040413205 84,478 -15,011 -15.09 11,069 -23.64 0.6992
2025-11-14 2025-09-30 13F/A-1 ARISTA NETWORKS INC USD 0.0001 COM SHS 040413205 99,489 19,708 24.70 14,497 77.60 0.8984
2025-11-12 2025-09-30 13F ARISTA NETWORKS INC USD 0.0001 COM SHS 040413205 99,489 19,708 14,497 0.3638
2025-08-11 2025-06-30 13F ARISTA NETWORKS COM SHS 040413205 79,781 -378 -0.47 8,162 31.43 0.5456
2025-05-13 2025-03-31 13F ARISTA NETWORKS COM SHS 040413205 80,159 69,271 636.21 6,211 416.21 0.4569
2025-02-12 2024-12-31 13F ARISTA NETWORKS COM SHS 040413205 10,888 4,317 65.70 1,203 -52.30 0.0799
2024-11-08 2024-09-30 13F ARISTA NETWORKS COM 040413106 6,571 1,223 22.87 2,522 34.58 0.1691
2024-08-14 2024-06-30 13F/A-1 ARISTA NETWORKS COM 040413106 5,348 1,270 31.14 1,874 58.54 0.1486
2024-08-13 2024-06-30 13F ARISTA NETWORKS COM 040413106 3,247 -831 1,874 0.0644
2024-05-09 2024-03-31 13F ARISTA NETWORKS COM 040413106 4,078 1,645 67.61 1,183 106.64 0.0901
2024-02-08 2023-12-31 13F ARISTA NETWORKS COM 040413106 2,433 -6,601 -73.07 573 -65.56 0.0472
2023-11-13 2023-09-30 13F ARISTA NETWORKS COM 040413106 9,034 6,930 329.37 1,662 388.53 0.1243
2023-08-10 2023-06-30 13F ARISTA NETWORKS COM 040413106 2,104 -35,256 -94.37 341 -94.58 0.0241
2023-05-04 2023-03-31 13F ARISTA NETWORKS COM 040413106 37,360 15,549 71.29 6,271 137.00 0.0843
2023-02-06 2022-12-31 13F ARISTA NETWORKS COM 040413106 21,811 951 4.56 2,647 12.40 0.0391
2022-11-08 2022-09-30 13F ARISTA NETWORKS COM 040413106 20,860 3,696 21.53 2,355 46.39 0.0359
2022-08-10 2022-06-30 13F ARISTA NETWORKS COM 040413106 17,164 0 0.00 1,609 -32.58 0.0210
2022-05-11 2022-03-31 13F ARISTA NETWORKS COM 040413106 17,164 -133 -0.77 2,385 -4.06 0.0274
2022-02-08 2021-12-31 13F ARISTA NETWORKS COM 040413106 17,297 13,327 335.69 2,486 82.26 0.0258
2021-10-27 2021-09-30 13F ARISTA NETWORKS COM 040413106 3,970 0 0.00 1,364 -5.15 0.0146
2021-08-11 2021-06-30 13F ARISTA NETWORKS COM 040413106 3,970 0 0.00 1,438 20.03 0.0144
2021-05-13 2021-03-31 13F ARISTA NETWORKS COM 040413106 3,970 0 0.00 1,199 3.90 0.0132
2021-02-11 2020-12-31 13F ARISTA NETWORKS COM 040413106 3,970 0 0.00 1,154 40.44 0.0131
2020-11-10 2020-09-30 13F ARISTA NETWORKS COM 040413106 3,970 0 0.00 822 -1.44 0.0111
2020-08-12 2020-06-30 13F ARISTA NETWORKS COM 040413106 3,970 0 0.00 834 3.61 0.0124
2020-05-14 2020-03-31 13F ARISTA NETWORKS COM 040413106 3,970 0 0.00 804 -0.37 0.0139
2020-02-11 2019-12-31 13F ARISTA NETWORKS COM 040413106 3,970 0 0.00 807 -14.87 0.0104
2019-11-13 2019-09-30 13F ARISTA NETWORKS COM 040413106 3,970 0 0.00 949 -7.96 0.0132
2019-08-01 2019-06-30 13F ARISTA NETWORKS COM 040413106 3,970 0 0.00 1,031 -17.47 0.0157
2019-05-14 2019-03-31 13F ARISTA NETWORKS COM 040413106 3,970 921 30.21 1,248 94.39 0.0206
2019-02-07 2018-12-31 13F ARISTA NETWORKS COM 040413106 3,049 -22,100 -87.88 642 -90.40 0.0109
2018-11-13 2018-09-30 13F ARISTA NETWORKS COM 040413106 25,149 98 0.39 6,686 3.66 0.1146
2018-07-18 2018-06-30 13F ARISTA NETWORKS COM 040413106 25,051 21,400 586.14 6,450 592.06 0.1239
2018-05-01 2018-03-31 13F ARISTA NETWORKS COM 040413106 3,651 602 19.74 932 29.81 0.0186
2018-01-18 2017-12-31 13F ARISTA NETWORKS COM 040413106 3,049 -35,000 -91.99 718 -90.05 0.0163
2017-10-30 2017-09-30 13F ARISTA NETWORKS COM 040413106 38,049 -7,278 -16.06 7,214 6.26 0.1588
2017-08-09 2017-06-30 13F ARISTA NETWORKS COM 040413106 45,327 45,327 6,790 0.1495
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.