Cerebras Systems Inc. Chief Technology Officer Sean Lie filed a Form 4 on October 28, 2026, disclosing multiple transactions in Class A Common Stock on October 27, 2026, including option exercises, a charitable transfer, and open-market sales executed under a Rule 10b5-1 trading plan.

Key Highlights

  • Three open-market sales: Sean Lie disposed of 14,500 shares at a weighted average price of $116.82, 45,400 shares at a weighted average price of $115.46, and 100 shares at $113.92, all on October 27, 2026.
  • Charitable transfer: The filing disclosed a gift of 18,000 shares to a donor-advised fund sponsored by a Section 501(c)(3) charitable organization at $0 consideration.
  • 10b5-1 plan: According to the filing, the sales were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 20, 2026.
  • Option exercises: Lie exercised stock options covering 28,898 shares (exercise price $5.48) and 3,125 shares (exercise price $5.02), both on October 27, 2026, resulting in Class A Common Stock received via Class B conversion.
  • Resulting direct ownership: Following all reported transactions, Lie directly held 263,592 shares of Class A Common Stock, per the filing.
  • Spouse-held derivative: The filing also reports 180,600 shares of Class A Common Stock underlying a Class B derivative security held indirectly by the reporting person through a spouse.
  • Issuer and exchange: Cerebras Systems Inc. trades on NASDAQ:CBRS.

Sean Lie's October 27 Transactions at Cerebras Systems

According to the Form 4 filed with the SEC, Sean Lie, Chief Technology Officer of Cerebras Systems Inc. (NASDAQ:CBRS), reported a series of transactions on October 27, 2026. The sales portion of the activity was conducted under a Rule 10b5-1 trading plan that Lie adopted on May 20, 2026, as the filing states. The three separate sale transactions totaled 60,000 shares of Class A Common Stock disposed of at weighted average prices of $116.82 (for 14,500 shares, ranging from $116.58 to $116.88), $115.46 (for 45,400 shares, ranging from $115.46 to $116.19), and $113.92 (for 100 shares).

In addition to the sales, the filing disclosed that Lie transferred 18,000 shares to a donor-advised fund sponsored by a charitable organization under Section 501(c)(3) of the Internal Revenue Code, recorded at $0 consideration. Lie also exercised two stock options: one covering 28,898 shares at an exercise price of $5.48, vesting in 48 substantially equal monthly installments beginning February 1, 2024; and a second covering 3,125 shares at an exercise price of $5.02, vesting in 48 substantially equal monthly installments beginning February 1, 2023. The Class B Common Stock acquired through these exercises was then converted into an equal number of Class A shares, as the filing notes the Class B stock is convertible at the reporting person's election with no expiration date.

After all reported transactions, the filing states Lie directly held 263,592 shares of Class A Common Stock and 7,582,992 shares of Class B Common Stock. An additional 180,600 shares of Class A Common Stock underlying a Class B derivative security are held indirectly through a spouse, per the filing. The form was signed by Robert Mills as Attorney-in-Fact and filed on October 28, 2026.

What Was Disclosed

The filing reported Sean Lie's open-market sale of 60,000 Class A shares under a 10b5-1 plan, a charitable transfer of 18,000 shares, and the exercise of two stock options on October 27, 2026, leaving him with a direct holding of 263,592 Class A shares.