Arista Networks, Inc.
MX ˙ BMV ˙ US0404132054
SecurityMX:ANET / Arista Networks, Inc.
InstitutionFirst Business Financial Services, Inc.
Latest Disclosed Ownership66,173 shares
Latest Disclosed Value $ 8,124,721
First Business Financial Services, Inc. reports 12.08% increase in ownership of ANET / Arista Networks, Inc.

On May 1, 2026 - First Business Financial Services, Inc. filed a 13F-HR form disclosing ownership of 66,173 shares of Arista Networks, Inc. (MX:ANET) valued at $8,124,721 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 59,041 shares of Arista Networks, Inc.. This represents a change in shares of 12.08% 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)
2026-05-01 2026-03-31 13F Arista Networks Com 040413205 66,173 7,132 12.08 8,125 5.02 0.7224
2026-02-06 2025-12-31 13F Arista Networks Com 040413205 59,041 1,949 3.41 7,736 -7.00 0.7104
2025-10-30 2025-09-30 13F Arista Networks Com 040413205 57,092 -8,784 -13.33 8,319 23.43 0.7631
2025-07-31 2025-06-30 13F Arista Networks Com 040413205 65,876 1,352 2.10 6,740 34.81 0.6078
2025-05-02 2025-03-31 13F Arista Networks Com 040413205 64,524 5,109 8.60 4,999 -23.88 0.4916
2025-02-06 2024-12-31 13F Arista Networks Com 040413205 59,415 45,204 318.09 6,567 20.41 0.6493
2024-11-06 2024-09-30 13F Arista Networks Com 040413106 14,211 89 0.63 5,454 10.20 0.5459
2024-08-02 2024-06-30 13F Arista Networks Com 040413106 14,122 941 7.14 4,949 29.49 0.5247
2024-05-15 2024-03-31 13F/A-1 Arista Networks Common 040413106 13,181 166 1.28 3,822 24.70 0.4099
2024-05-06 2024-03-31 13F Arista Networks Common 040413106 13,015 0 3,065 0.3563
2024-02-14 2023-12-31 13F Arista Networks Common 040413106 13,015 118 0.91 3,065 29.22 0.3563
2023-11-14 2023-09-30 13F Arista Networks Common 040413106 12,897 -60 -0.46 2,372 13.01 0.3023
2023-08-07 2023-06-30 13F Arista Networks Common 040413106 12,957 44 0.34 2,100 -3.14 0.2590
2023-05-09 2023-03-31 13F Arista Networks Common 040413106 12,913 -229 -1.74 2,168 216,600.00 0.2720
2023-02-02 2022-12-31 13F Arista Networks Common 040413106 13,142 -1,183 -8.26 2 -99.93 0.2143
2022-11-15 2022-09-30 13F Arista Networks Common 040413106 14,325 578 4.20 1,499 16.29 0.2140
2022-08-02 2022-06-30 13F Arista Networks Common 040413106 13,747 -806 -5.54 1,289 -36.28 0.1736
2022-05-09 2022-03-31 13F Arista Networks Common 040413106 14,553 238 1.66 2,023 -1.70 0.2237
2022-02-10 2021-12-31 13F Arista Networks Common 040413106 14,315 10,707 296.76 2,058 65.97 0.2178
2021-10-26 2021-09-30 13F Arista Networks Common 040413106 3,608 60 1.69 1,240 -3.50 0.1419
2021-07-20 2021-06-30 13F Arista Networks Common 040413106 3,548 431 13.83 1,285 36.56 0.1502
2021-04-20 2021-03-31 13F Arista Networks Common 040413106 3,117 301 10.69 941 15.04 0.1249
2021-01-28 2020-12-31 13F Arista Networks Common 040413106 2,816 207 7.93 818 51.48 0.1189
2020-11-04 2020-09-30 13F Arista Networks Common 040413106 2,609 -22 -0.84 540 -2.35 0.0901
2020-08-12 2020-06-30 13F Arista Networks Com 040413106 2,631 99 3.91 553 7.80 0.0991
2020-05-01 2020-03-31 13F Arista Networks Common 040413106 2,532 -58 -2.24 513 -2.66 0.1021
2020-02-10 2019-12-31 13F Arista Networks Common 040413106 2,590 2,590 527 0.0834
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.