Arista Networks: CEO and chairperson Ullal Jayshree sold 158,543 shares

What happened

• Ullal Jayshree, CEO and chairperson, sold a total of 158,543 Arista Networks shares in open-market transactions on Oct 8 and Oct 9, 2026, for total proceeds of $34,417,689. Reported weighted-average prices were roughly $217.05 and $217.10 across the trades.

Key details

• Transaction dates and prices: sales on Oct 8, 2026 (weighted average price reported $217.05) and Oct 9, 2026 (weighted average price reported $217.10). Footnotes report per-share price ranges of $217.00 to $217.215 and $217.00 to $217.35 across the multiple trades.
• Reported proceeds by lot: $868,193; $4,050,139; $868,193; $4,050,139; $4,338,796; $20,242,229 (total $34,417,689).
• Shares owned after the transactions: the filing excerpt provided does not report shares owned after these transactions.
• Footnotes of note:
  • F1 and F5: sales were effected pursuant to a Rule 10b5-1 trading plan entered Nov 14, 2025.
  • F2 and F4: prices shown are weighted averages; the filing offers to provide the number of shares sold at each separate price within the reported ranges upon request.
  • F3, F6 and F7: some shares are held in trusts for relatives/children for which the reporting person serves as trustee or co-trustee; the reporting person shares voting and investment control but disclaims beneficial ownership.
• Filing date vs. transaction dates: the Form 4 was filed Oct 13, 2026. The Oct 8, 2026 sale had a two-business-day filing deadline of Oct 12, 2026, so the Oct 8 sale appears to have been filed after that deadline while the Oct 9 sale was filed within two business days.

Why it may matter

• These were open-market sales (transaction code S); they were not reported as option exercises or gifts.
• The filing says the sales were made pursuant to a pre-existing Rule 10b5-1 plan adopted Nov 14, 2025.
• Some shares involved are held in trusts for relatives or children for which the reporting person is trustee or co-trustee; the reporting person disclaims beneficial ownership of those trust shares. A filing does not show why the insider traded or why the company acted.