Arista Networks, Inc.
MX ˙ BMV ˙ US0404132054
SecurityMX:ANET / Arista Networks, Inc.
InstitutionCalamos Advisors LLC
Latest Disclosed Ownership526,164 shares
Latest Disclosed Value $ 64,602,416
Calamos Advisors LLC reports 216.87% increase in ownership of ANET / Arista Networks, Inc.

On May 4, 2026 - Calamos Advisors LLC filed a 13F-HR form disclosing ownership of 526,164 shares of Arista Networks, Inc. (MX:ANET) valued at $64,602,416 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 166,048 shares of Arista Networks, Inc.. This represents a change in shares of 216.87% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-04 2026-03-31 13F ARISTA NETWORKS COM SHS 040413205 526,164 360,116 216.87 64,602 196.93 0.2279
2026-01-29 2025-12-31 13F ARISTA NETWORKS COM SHS 040413205 166,048 -70,784 -29.89 21,757 -36.95 0.0813
2025-10-20 2025-09-30 13F ARISTA NETWORKS COM SHS 040413205 236,832 -86,984 -26.86 34,509 4.16 0.1275
2025-08-08 2025-06-30 13F ARISTA NETWORKS COM SHS 040413205 323,816 151,647 88.08 33,130 148.36 0.1304
2025-04-29 2025-03-31 13F ARISTA NETWORKS COM SHS 040413205 172,169 1,917 1.13 13,340 -29.11 0.0581
2025-01-24 2024-12-31 13F ARISTA NETWORKS COM SHS 040413205 170,252 127,689 300.00 18,818 15.19 0.0787
2024-11-07 2024-09-30 13F ARISTA NETWORKS COM 040413106 42,563 -1,370 -3.12 16,337 6.10 0.0706
2024-07-25 2024-06-30 13F ARISTA NETWORKS COM 040413106 43,933 -1,635 -3.59 15,398 16.53 0.0684
2024-05-08 2024-03-31 13F ARISTA NETWORKS COM 040413106 45,568 45,568 13,214 0.0626
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.