Arista Networks, Inc.
MX ˙ BMV ˙ US0404132054
SecurityMX:ANET / Arista Networks, Inc.
InstitutionMan Group plc
Latest Disclosed Ownership1,923,339 shares
Latest Disclosed Value $ 236,147,563
Man Group plc ownership in ANET / Arista Networks, Inc.

On May 15, 2026 - Man Group plc filed a 13F-HR form disclosing ownership of 1,923,339 shares of Arista Networks, Inc. (MX:ANET) valued at $236,147,563 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,258,305 shares of Arista Networks, Inc.. This represents a change in shares of -14.83% during the quarter.

Man Group plc 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 28,500 of underlying shares valued at $3,499,230 USD and put options representing 28,500 of underlying shares valued at $3,499,230 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 1,923,339 -334,966 -14.83 236,148 -20.19 0.4284
2026-02-17 2025-12-31 13F ARISTA NETWORKS COM SHS 040413205 2,258,305 653,510 40.72 295,906 26.54 0.5030
2025-11-14 2025-09-30 13F ARISTA NETWORKS COM SHS 040413205 1,604,795 -72,457 -4.32 233,835 36.27 0.4066
2025-08-14 2025-06-30 13F ARISTA NETWORKS COM SHS 040413205 1,677,252 -99,052 -5.58 171,600 24.68 0.3269
2025-05-15 2025-03-31 13F ARISTA NETWORKS COM SHS 040413205 1,776,304 538,288 43.48 137,628 0.58 0.3490
2025-02-14 2024-12-31 13F ARISTA NETWORKS COM SHS 040413205 1,238,016 888,592 254.30 136,838 2.03 0.3601
2024-11-14 2024-09-30 13F ARISTA NETWORKS COM 040413106 349,424 6,072 1.77 134,116 11.45 0.3492
2024-08-14 2024-06-30 13F ARISTA NETWORKS COM 040413106 343,352 284,988 488.29 120,338 611.05 0.3039
2024-05-15 2024-03-31 13F ARISTA NETWORKS COM 040413106 58,364 -12,671 -17.84 16,924 1.17 0.0427
2024-02-14 2023-12-31 13F ARISTA NETWORKS COM 040413106 71,035 16,729 -50.44 0.0466
2023-11-14 2023-09-30 13F ARISTA NETWORKS COM 040413106 33,756 68.27 0.1046
2023-08-14 2023-06-30 13F ARISTA NETWORKS COM 040413106 123,787 20,061 -29.36 0.0619
2023-05-15 2023-03-31 13F ARISTA NETWORKS COM 040413106 28,399 -76.81 0.1010
2023-02-14 2022-12-31 13F ARISTA NETWORKS COM 040413106 1,009,059 564,796 127.13 122,449 144.15 0.4390
2022-11-14 2022-09-30 13F ARISTA NETWORKS COM 040413106 444,263 50,153 13.61 0.2328
2022-08-15 2022-06-30 13F ARISTA NETWORKS COM 040413106 44,145 12,405.67 0.1871
2022-05-16 2022-03-31 13F ARISTA NETWORKS COM 040413106 2,540 -144,820 -98.28 353 -98.33 0.0012
2022-02-14 2021-12-31 13F ARISTA NETWORKS COM 040413106 147,360 115,341 360.23 21,183 92.52 0.0681
2021-11-15 2021-09-30 13F ARISTA NETWORKS COM 040413106 32,019 31,390 4,990.46 11,003 4,725.88 0.0386
2021-08-16 2021-06-30 13F ARISTA NETWORKS COM 040413106 629 -318 -33.58 228 -20.28 0.0008
2021-05-17 2021-03-31 13F ARISTA NETWORKS COM 040413106 947 947 286 0.0013
2021-02-16 2020-12-31 13F ARISTA NETWORKS COM 040413106 0 -6,347 -100.00 0 -100.00
2020-11-16 2020-09-30 13F ARISTA NETWORKS COM 040413106 6,347 -37,997 -85.69 1,314 -85.89 0.0052
2020-08-14 2020-06-30 13F ARISTA NETWORKS COM 040413106 44,344 20,715 87.67 9,314 94.61 0.0470
2020-05-15 2020-03-31 13F ARISTA NETWORKS COM 040413106 23,629 -9,710 -29.13 4,786 -29.43 0.0310
2020-02-18 2019-12-31 13F ARISTA NETWORKS COM 040413106 33,339 30,275 988.09 6,782 826.50 0.0223
2019-11-14 2019-09-30 13F ARISTA NETWORKS COM 040413106 3,064 907 42.05 732 30.95 0.0027
2019-08-14 2019-06-30 13F ARISTA NETWORKS COM 040413106 2,157 299 16.09 559 -4.28 0.0020
2019-05-15 2019-03-31 13F ARISTA NETWORKS COM 040413106 1,858 -2,675 -59.01 584 -38.85 0.0022
2019-02-14 2018-12-31 13F ARISTA NETWORKS COM 040413106 4,533 2,730 151.41 955 98.96 0.0042
2018-11-14 2018-09-30 13F ARISTA NETWORKS COM 040413106 1,803 -373 -17.14 480 -14.29 0.0018
2018-08-14 2018-06-30 13F ARISTA NETWORKS COM 040413106 2,176 -25,150 -92.04 560 -91.97 0.0023
2018-05-15 2018-03-31 13F ARISTA NETWORKS COM 040413106 27,326 27,326 6,977 0.0319
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 28,500 -81.11 3,499 -82.30 n/a n/a n/a
2026-02-17 2025-12-31 13F ARISTA NETWORKS COM SHS Call 150,900 24.81 19,772 12.24 n/a n/a n/a
2025-11-14 2025-09-30 13F ARISTA NETWORKS COM SHS Call 120,900 -43.72 17,616 -19.84 n/a n/a n/a
2025-08-14 2025-06-30 13F ARISTA NETWORKS COM SHS Call 214,800 524.42 21,976 724.62 n/a n/a n/a
2025-05-15 2025-03-31 13F ARISTA NETWORKS COM SHS Call 34,400 2,665 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 28,500 -81.11 3,499 -82.30 n/a n/a n/a
2026-02-17 2025-12-31 13F ARISTA NETWORKS COM SHS Put 150,900 24.81 19,772 12.24 n/a n/a n/a
2025-11-14 2025-09-30 13F ARISTA NETWORKS COM SHS Put 120,900 -1.14 17,616 40.79 n/a n/a n/a
2025-08-14 2025-06-30 13F ARISTA NETWORKS COM SHS Put 122,300 255.52 12,513 369.49 n/a n/a n/a
2025-05-15 2025-03-31 13F ARISTA NETWORKS COM SHS Put 34,400 2,665 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.