Arista faces a $9.7 billion parts bill after insiders sold $740.8 million of stock

The chief executive sold at $201.22

On August 5, Jayshree Ullal, chair and chief executive of Arista Networks▲+3.37% — Arista Networks, up 3.37 percent today, the data-center switching maker, sold 767,029 shares at an average $201.22, or $154.3 million, under a pre-arranged Rule 10b5-1 trading plan; she kept 16.4 million shares ¹. Major shareholder Andreas Bechtolsheim sold $61.0 million the same day, and insiders as a group sold $740.8 million over three months ¹. By October 15 the stock had fallen 5.1% to $185.54↗, below her sale price ¹. Third-quarter results land on November 3 ².

The bill for the boom sits on two balance sheets

Arista's 10-Q, its quarterly filing with the US securities regulator↗, shows $9.7 billion of non-cancellable purchase commitments at June 30, off the balance sheet, with $9.4 billion due within 12 months, up from about $3.6 billion a year earlier ³⁴. The orders lock in memory and chips, and Ullal expects component constraints to persist into 2028 ⁴. Revenue rose 37.7% to $3.04 billion and the 2026 outlook was lifted to about $12.6 billion ⁴, but gross margin slipped from 65.2% to 62.9% and the third-quarter operating-margin guide is 48 to 49% ⁵⁴.

Cisco▼−0.83% — Cisco, down 0.83 percent today runs the same boom on the other foot: fiscal fourth-quarter revenue of $17.3 billion↗, up 18%, product orders up 35%, but inventory up from $3.2 billion to $5.7 billion in a year and adjusted gross margin down from 68.4% to 66.3%, with 65 to 66% guided ⁶. Of $9.3 billion in hyperscaler AI orders booked in fiscal 2026, hyperscalers being the giant cloud operators, about $4 billion has become revenue; $7.5 billion lands in fiscal 2027 ⁶.

Two readings of the same budgets

Deutsche Bank reconfirmed Buy ratings on both companies on October 19: analyst Gianmarco Conti argues hyperscaler money reaches networks 12 to 18 months late, so today's budgets carry revenue well past next year ⁷. He still flags optical circuit switches, which steer light without electronic packet switching, as a threat to the spine layer; Ullal counters that pluggable optics and copper hold until 2028 or 2029 ⁷. In Singapore on October 12, Broadcom▲+1.86% — Broadcom, up 1.86 percent today chief Hock Tan read the same budgets the other way: capital "might be the biggest constraint↗," with about $200 billion a year spent running AI models against roughly $150 billion coming back ⁸. Broadcom and Marvell▲+4.02% — Marvell, up 4.02 percent today each fell about 4% after the remarks ⁹.

Where the delay would land

The exposure is uneven: Cisco's hyperscaler AI work is about 6% of revenue, while Arista rides the same budgets directly, with Microsoft▲+0.89% — Microsoft, up 0.89 percent today and Meta▼−0.50% — Meta, down 0.50 percent today as key partners and one or two customers likely above 10% of revenue ⁷⁴. If the money slows, order books can hold while two balance sheets absorb the delay. The November 3 filing shows it first, in the commitments line, the margin guide and the switching commentary.