Arista Networks, Inc.
MX ˙ BMV ˙ US0404132054
SecurityMX:ANET / Arista Networks, Inc.
InstitutionM&t Bank Corp
Latest Disclosed Ownership117,528 shares
Latest Disclosed Value $ 14,430,088
M&t Bank Corp reports 6.96% decrease in ownership of ANET / Arista Networks, Inc.

On May 12, 2026 - M&t Bank Corp filed a 13F-HR form disclosing ownership of 117,528 shares of Arista Networks, Inc. (MX:ANET) valued at $14,430,088 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on January 30, 2026 disclosing 126,314 shares of Arista Networks, Inc.. This represents a change in shares of -6.96% 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 COM SHS 040413205 117,528 -8,786 -6.96 14,430 -12.81 0.0117
2026-01-30 2025-12-31 13F/A-1 ARISTA NETWORKS COM SHS 040413205 126,314 4,087 3.34 16,551 -7.06 0.0531
2026-01-28 2025-12-31 13F ARISTA NETWORKS COM SHS 040413205 4,012,373 3,890,146 1,088,461 0.6486
2025-11-14 2025-09-30 13F ARISTA NETWORKS COM SHS 040413205 122,227 12,725 11.62 17,809 58.97 0.0599
2025-08-13 2025-06-30 13F ARISTA NETWORKS COM SHS 040413205 109,502 -524 -0.48 11,203 31.41 0.0385
2025-04-30 2025-03-31 13F ARISTA NETWORKS COM SHS 040413205 110,026 -6,908 -5.91 8,525 -34.04 0.0311
2025-02-06 2024-12-31 13F ARISTA NETWORKS COM SHS 040413106 116,934 91,308 356.31 12,925 31.41 0.0433
2024-11-19 2024-09-30 13F/A-1 ARISTA NETWORKS COM 040413106 25,626 -397 -1.53 9,836 7.84 0.0323
2024-11-15 2024-09-30 13F ATI COM 040413106 58,576 32,553 10,741 0.0065
2024-07-31 2024-06-30 13F ARISTA NETWORKS COM 040413106 26,023 728 2.88 9,121 24.35 0.0311
2024-05-07 2024-03-31 13F ARISTA NETWORKS COM 040413106 25,295 -22,950 -47.57 7,334 -35.45 0.0255
2024-02-06 2023-12-31 13F ARISTA NETWORKS COM 040413106 48,245 31,386 186.17 11,362 266.37 0.0417
2023-11-02 2023-09-30 13F ARISTA NETWORKS COM 040413106 16,859 1,356 8.75 3,101 23.45 0.0124
2023-08-09 2023-06-30 13F ARISTA NETWORKS COM 040413106 15,503 -2,356 -13.19 2,513 -16.18 0.0094
2023-05-11 2023-03-31 13F ARISTA NETWORKS COM 040413106 17,859 3,977 28.65 2,998 77.97 0.0116
2023-02-13 2022-12-31 13F/A-1 ARISTA NETWORKS COM 040413106 13,882 446 3.32 1,684 11.08 0.0068
2023-02-13 2022-12-31 13F ARES CAPITAL COM 040413106 37,109 23,673 1,828 0.0074
2022-11-17 2022-09-30 13F/A-1 ARISTA NETWORKS COM 040413106 13,436 -293 -2.13 1,516 23.86 0.0067
2022-11-14 2022-09-30 13F ARISTA NETWORKS COM 040413106 13,436 -293 1,516 0.0013
2022-08-05 2022-06-30 13F ARISTA NETWORKS COM 040413106 13,729 -2,505 -15.43 1,224 -45.72 0.0058
2022-05-09 2022-03-31 13F ARISTA NETWORKS COM 040413106 16,234 -1,056 -6.11 2,255 -9.33 0.0100
2022-02-07 2021-12-31 13F ARISTA NETWORKS COM 040413106 17,290 13,422 347.00 2,487 87.13 0.0104
2021-10-28 2021-09-30 13F ARISTA NETWORKS COM 040413106 3,868 1,265 48.60 1,329 41.08 0.0060
2021-08-13 2021-06-30 13F ARISTA NETWORKS COM 040413106 2,603 -342 -11.61 942 5.96 0.0041
2021-05-06 2021-03-31 13F ARISTA NETWORKS COM 040413106 2,945 -184 -5.88 889 -2.41 0.0038
2021-02-12 2020-12-31 13F ARISTA NETWORKS COM 040413106 3,129 20 0.64 911 41.68 0.0040
2020-11-06 2020-09-30 13F ARISTA NETWORKS COM 040413106 3,109 -262 -7.77 643 -9.05 0.0032
2020-07-29 2020-06-30 13F ARISTA NETWORKS COM 040413106 3,371 -153 -4.34 707 -1.12 0.0038
2020-05-14 2020-03-31 13F ARISTA NETWORKS COM 040413106 3,524 12 0.34 715 0.14 0.0042
2020-02-07 2019-12-31 13F ARISTA NETWORKS COM 040413106 3,512 -2,240 -38.94 714 -48.03 0.0034
2019-11-12 2019-09-30 13F ARISTA NETWORKS COM 040413106 5,752 84 1.48 1,374 -6.66 0.0069
2019-08-12 2019-06-30 13F ARISTA NETWORKS COM 040413106 5,668 299 5.57 1,472 -12.80 0.0077
2019-05-15 2019-03-31 13F ARISTA NETWORKS COM 040413106 5,369 2,847 112.89 1,688 217.89 0.0088
2019-02-01 2018-12-31 13F ARISTA NETWORKS COM 040413106 2,522 -805 -24.20 531 -39.93 0.0030
2018-11-09 2018-09-30 13F ARISTA NETWORKS COM 040413106 3,327 144 4.52 884 8.07 0.0044
2018-08-10 2018-06-30 13F ARISTA NETWORKS COM 040413106 3,183 352 12.43 818 13.45 0.0044
2018-05-04 2018-03-31 13F ARISTA NETWORKS COM 040413106 2,831 -260 -8.41 721 -0.83 0.0039
2018-02-06 2017-12-31 13F ARISTA NETWORKS COM 040413106 3,091 -24 -0.77 727 23.01 0.0038
2017-11-13 2017-09-30 13F ARISTA NETWORKS COM 040413106 3,115 800 34.56 591 70.32 0.0032
2017-08-11 2017-06-30 13F ARISTA NETWORKS COM 040413106 2,315 140 6.44 347 20.91 0.0020
2017-05-10 2017-03-31 13F ARISTA NETWORKS COM 040413106 2,175 2,175 287 0.0017
2016-05-11 2016-03-31 13F ARISTA NETWORKS COM 040413106 0 -4,285 -100.00 0 -100.00
2016-02-12 2015-12-31 13F ARISTA NETWORKS COM 040413106 4,285 968 29.18 333 64.04 0.0022
2015-11-13 2015-09-30 13F ARISTA NETWORKS COM 040413106 3,317 3,317 203 0.0014
2014-11-14 2014-09-30 13F ARISTA NETWORKS COMMON 040413106 0 -200 -100.00 0 -100.00
2014-08-13 2014-06-30 13F ARISTA NETWORKS COMMON 040413106 200 200 12 0.0005
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.