Cerebras Systems Director Steven Vassallo Disposes of $10.5M in Stock

Executive Summary

On September 4, 2026, Steven Vassallo, a member of the Board of Directors of Cerebras Systems Inc. ($CBRS), executed an open-market sale of 50,000 shares of Class A Common Stock held indirectly through a revocable trust. The shares were sold in three tranches at weighted average prices between $209.81 and $211.56, resulting in total gross proceeds of $10,515,134.38.

Transaction Breakdown

• Tranche 1: 21,117 shares sold at a weighted average price of $209.81 ($4,430,557.77)
• Tranche 2: 21,773 shares sold at a weighted average price of $210.37 ($4,580,385.01)
• Tranche 3: 7,110 shares sold at a weighted average price of $211.56 ($1,504,191.60)

Holdings Context

Following these dispositions:

• Revocable Trust Holdings: 171,977 shares of Class A Common Stock remaining.
• Irrevocable Trust Holdings: 139,618 shares of Class A Common Stock held separately.
• Total Indirect Exposure: 311,595 shares post-transaction.
• Rule 10b5-1 Flag: The filing does not indicate that the sale was conducted under a Rule 10b5-1 trading plan.