Arista Co-Founder Bechtolsheim Has Sold $668 Million of Stock Since May

By Rebecca Stone

Arista Networks co-founder Andreas Bechtolsheim has sold roughly $668.2 million of stock across 14 transactions since May 22, 2026 — and the filings suggest the selling says very little about what he thinks of the stock.

The latest Form 4, accepted by the SEC on November 9 at 7:06 p.m. ET, shows Bechtolsheim sold 260,000 Arista shares (NYSE:ANET) on November 5 at a weighted average price of about $165.45. That single sale netted roughly $43.0 million.

Arista lists Bechtolsheim as its Founder and Chief Architect. The 14 sales since May total 3,784,740 shares, averaging about $176.56 apiece, according to a count of his filings.

Why the timing means nothing

Every one of those sales ran under a Rule 10b5-1 trading plan that Bechtolsheim entered into on February 20, 2026. A 10b5-1 plan is a written schedule, set months in advance, that tells a broker when to sell.

The November 5 sale came on a brutal day. Arista fell 10.82% to $159.16 as the AI selloff spread from chip stocks into networking names. Because the schedule predates the drop, the timing shows nothing about his view of it.

The sale split into 14 lots priced between $158.35 and $171.5475. Afterward, his family trust — of which he is trustee — held 180,015,156 shares. The filings don't show how many shares remain under the plan or when it ends.

Fourteen sales, stake largely intact

The 14 sales amount to about 2% of his holding. At the November 9 close, the trust's shares were worth about $33.5 billion, roughly 14% of Arista's market value.

His largest single sale came on August 6: 411,848 shares at $192.75, about $79.4 million. That total included his last 111,848 directly held shares plus 300,000 trust shares. A June 4 filing shows him exercising 158,000 old stock options at $14 to $15 a share.

When a founder holds most of his wealth in one stock, selling small slices on a fixed schedule is ordinary diversification. The gaps between his sales — ranging from a few days to about six weeks — look like a preset calendar.

The rebound he sold into

Arista closed at $170.80 on November 6 and $186.17 on November 9, a 17.0% gain in two sessions. At that close, the shares he sold on November 5 would have been worth about $48.4 million — $5.4 million more than he received. That gap is hypothetical math on a sale the plan scheduled months earlier.

His October 30 sale of 267,892 shares at $171.19, about $45.9 million, also landed on a down day — Arista fell 8.34% that session. And the extra shares hitting the market stay modest: a $43.0 million sale is small next to a company valued at $235.28 billion.

What do the sales mean for shareholders?

The filings point to routine diversification, and the business backdrop backs that up. On November 3, Arista reported adjusted EPS of $1.20 against a $1.08 consensus, and guided fiscal 2027 revenue to about $18.5 billion, above the $16.44 billion consensus. CEO Jayshree Ullal said the quarter "marks our largest ever year-over-year revenue growth in the history of being a public company."

The main risk isn't the founder's selling. It's valuation. The stock trades at 67 times earnings and sits below its 52-week high of $217.41, so it can still swing sharply on AI sentiment.

The next Form 4 is what to watch. A sale outside the February 20 plan, a change to the plan, or a sharp increase in the pace of selling would change the read — as would a close below the November 5 level of $159.16.