Arista Networks, Inc.
MX ˙ BMV ˙ US0404132054
SecurityMX:ANET / Arista Networks, Inc.
InstitutionNomura Holdings Inc
Latest Disclosed Ownership102,777 shares
Latest Disclosed Value $ 12,618,960
Nomura Holdings Inc ownership in ANET / Arista Networks, Inc.

On May 15, 2026 - Nomura Holdings Inc filed a 13F-HR form disclosing ownership of 102,777 shares of Arista Networks, Inc. (MX:ANET) valued at $12,618,960 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 143,728 shares of Arista Networks, Inc.. This represents a change in shares of -28.49% during the quarter.

Nomura Holdings Inc has a history of taking positions in derivatives of the underlying security (ANET) in the form of stock options. The firm currently holds call options representing 40,300 of underlying shares valued at $4,948,034 USD and put options representing 12,000 of underlying shares valued at $1,473,360 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:ANET / Arista Networks, Inc. Historical Put/Call Ratio
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)
2026-05-15 2026-03-31 13F ARISTA NETWORKS COM SHS 040413205 102,777 -40,951 -28.49 12,619 -33.00 0.0256
2026-02-17 2025-12-31 13F ARISTA NETWORKS COM SHS 040413205 143,728 37,409 35.19 18,833 21.57 0.0251
2025-11-14 2025-09-30 13F ARISTA NETWORKS COM SHS 040413205 106,319 2,603 2.51 15,492 45.99 0.0240
2025-08-18 2025-06-30 13F/A-1 ARISTA NETWORKS COM SHS 040413205 103,716 -41,468 -28.56 10,611 -5.66 0.0221
2025-08-14 2025-06-30 13F ARISTA NETWORKS COM SHS 040413205 116,511 -28,673 11,920 0.0151
2025-05-15 2025-03-31 13F ARISTA NETWORKS COM SHS 040413205 145,184 100,883 227.72 11,249 129.74 0.0210
2025-02-14 2024-12-31 13F ARISTA NETWORKS COM SHS 040413205 44,301 39,626 847.61 4,897 172.91 0.0066
2025-01-13 2024-09-30 13F/A-1 ARISTA NETWORKS COM 040413106 4,675 -5,367 -53.45 1,794 -49.02 0.0041
2024-11-14 2024-09-30 13F ARISTA NETWORKS COM 040413106 4,675 -5,367 1,794 0.0030
2024-08-14 2024-06-30 13F ARISTA NETWORKS COM 040413106 10,042 8,031 399.35 3,520 503.60 0.0067
2024-05-15 2024-03-31 13F ARISTA NETWORKS COM 040413106 2,011 -3,055 -60.30 583 -51.13 0.0015
2024-03-27 2023-12-31 13F/A-1 ARISTA NETWORKS COM 040413106 5,066 5,066 1,193 0.0032
2024-02-14 2023-12-31 13F ARISTA NETWORKS COM 040413106 5,066 5,066 1,193 0.0025
2023-11-14 2023-09-30 13F ARISTA NETWORKS COM 040413106 0 -3,808 -100.00 0 -100.00
2023-08-14 2023-06-30 13F ARISTA NETWORKS COM 040413106 3,808 3,808 617 0.0017
2022-08-17 2022-06-30 13F/A-1 ARISTA NETWORKS CMN 040413106 0 -4,446 -100.00 0 -100.00
2022-08-15 2022-06-30 13F ARISTA NETWORKS CMN 040413106 0 -4,446 0
2022-05-18 2022-03-31 13F ARISTA NETWORKS CMN 040413106 4,446 455 11.40 620 8.01 0.0019
2022-02-14 2021-12-31 13F ARISTA NETWORKS CMN 040413106 3,991 2,312 137.70 574 -2.38 0.0015
2021-11-15 2021-09-30 13F ARISTA NETWORKS CMN 040413106 1,679 481 40.15 588 35.48 0.0015
2021-08-16 2021-06-30 13F ARISTA NETWORKS CMN 040413106 1,198 -186 -13.44 434 0.0011
2021-05-17 2021-03-31 13F ARISTA NETWORKS CMN 040413106 1,384 -3,960 -74.10 0 -100.00 0.0009
2021-02-16 2020-12-31 13F ARISTA NETWORKS CMN 040413106 5,344 381 7.68 2 -99.90 0.0026
2020-11-12 2020-09-30 13F ARISTA NETWORKS CMN 040413106 4,963 -834 -14.39 1,028 -23.05 0.0023
2019-11-14 2019-09-30 13F ARISTA NETWORKS CMN 040413106 5,797 1,175 25.42 1,336 9.96 0.0051
2019-08-23 2019-06-30 13F/A-1 ARISTA NETWORKS CMN 040413106 4,622 1,034 28.82 1,215 6.49 0.0054
2019-08-14 2019-06-30 13F ARISTA NETWORKS CMN 040413106 4,622 1,034 1,215
2019-05-14 2019-03-31 13F ARISTA NETWORKS CMN 040413106 3,588 -35,827 -90.90 1,141 -86.22 0.0048
2019-02-14 2018-12-31 13F ARISTA NETWORKS CMN 040413106 39,415 37,369 1,826.44 8,278 1,458.95 0.0308
2018-11-14 2018-09-30 13F ARISTA NETWORKS CMN 040413106 2,046 10 0.49 531 1.34 0.0019
2018-08-17 2018-06-30 13F/A-1 ARISTA NETWORKS CMN 040413106 2,036 1,147 129.02 524 130.84 0.0017
2018-08-14 2018-06-30 13F ARISTA NETWORKS CMN 040413106 2,036 1,147 490
2018-05-14 2018-03-31 13F/A-1 ARISTA NETWORKS CMN 040413106 889 -5,404 -85.87 227 -84.70 0.0004
2018-05-14 2018-03-31 13F ARISTA NETWORKS CMN 040413106 7,182 1,711
2018-02-14 2017-12-31 13F ARISTA NETWORKS CMN 040413106 6,293 6,293 1,484 0.0026
2017-08-15 2017-06-30 13F ARISTA NETWORKS CMN 040413106 0 -3,010 -100.00 0 -100.00
2017-05-18 2017-03-31 13F/A-1 ARISTA NETWORKS CMN 040413106 3,010 3,010 398 0.0010
2017-05-15 2017-03-31 13F ARISTA NETWORKS CMN 040413106 3,010 398
2016-11-14 2016-09-30 13F ARISTA NETWORKS CMN 040413106 0 -76,946 -100.00 0 -100.00
2016-09-02 2016-06-30 13F/A-1 ARISTA NETWORKS CMN 040413106 76,946 48,548 170.96 5,002 182.60 0.0163
2016-08-15 2016-06-30 13F ARISTA NETWORKS CMN 040413106 76,946 5,002
2016-05-16 2016-03-31 13F ARISTA NETWORKS CMN 040413106 28,398 28,398 1,770 0.0060
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F ARISTA NETWORKS COM SHS Call 40,300 -56.76 4,948 -59.48 n/a n/a n/a
2026-02-17 2025-12-31 13F ARISTA NETWORKS COM SHS Call 93,200 0.00 12,212 -10.08 n/a n/a n/a
2025-11-14 2025-09-30 13F ARISTA NETWORKS COM SHS Call 93,200 10.30 13,580 57.09 n/a n/a n/a
2025-08-18 2025-06-30 13F/A ARISTA NETWORKS COM SHS Call 84,500 0.00 8,645 32.05 n/a n/a n/a
2025-08-14 2025-06-30 13F ARISTA NETWORKS COM SHS Call 84,500 8,645 n/a n/a n/a
2025-05-15 2025-03-31 13F ARISTA NETWORKS COM SHS Call 84,500 6,547 n/a n/a n/a
2025-02-14 2024-12-31 13F ARISTA NETWORKS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-01-13 2024-09-30 13F/A ARISTA NETWORKS COM Call 30,600 11,745 n/a n/a n/a
2024-11-14 2024-09-30 13F ARISTA NETWORKS COM Call 30,600 11,745 n/a n/a n/a
2017-05-18 2017-03-31 13F/A ARISTA NETWORKS CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2017-02-13 2016-12-31 13F ARISTA NETWORKS CMN Call 340,000 43.16 32,902 62.94 n/a n/a n/a
2016-11-14 2016-09-30 13F ARISTA NETWORKS CMN Call 237,500 340.63 20,193 476.28 n/a n/a n/a
2016-09-02 2016-06-30 13F/A ARISTA NETWORKS CMN Call 53,900 3,504 n/a n/a n/a
2016-08-15 2016-06-30 13F ARISTA NETWORKS CMN Call 53,900 3,504 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F ARISTA NETWORKS COM SHS Put 12,000 -93.49 1,473 -93.90 n/a n/a n/a
2026-02-17 2025-12-31 13F ARISTA NETWORKS COM SHS Put 184,200 0.00 24,136 -10.07 n/a n/a n/a
2025-11-14 2025-09-30 13F ARISTA NETWORKS COM SHS Put 184,200 0.00 26,840 42.42 n/a n/a n/a
2025-08-18 2025-06-30 13F/A ARISTA NETWORKS COM SHS Put 184,200 117.99 18,846 187.84 n/a n/a n/a
2025-08-14 2025-06-30 13F ARISTA NETWORKS COM SHS Put 184,200 18,846 n/a n/a n/a
2025-05-15 2025-03-31 13F ARISTA NETWORKS COM SHS Put 84,500 6,547 n/a n/a n/a
2016-11-14 2016-09-30 13F ARISTA NETWORKS CMN Put 0 -100.00 0 -100.00 n/a n/a n/a
2016-09-02 2016-06-30 13F/A ARISTA NETWORKS CMN Put 120,400 361.30 7,826 381.01 n/a n/a n/a
2016-08-15 2016-06-30 13F ARISTA NETWORKS CMN Put 120,400 7,826 n/a n/a n/a
2016-05-16 2016-03-31 13F ARISTA NETWORKS CMN Put 26,100 1,627 n/a n/a n/a
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.