Cerebras (CBRS) CTO Sean Lie Sells $25.1M in Stock

What Happened
Sean Lie, Chief Technology Officer of Cerebras Systems (CBRS), reported multiple transactions on 2026-09-25. He sold a total of 120,000 open-market shares for approximately $25.08 million (individual trade prices ranged roughly $204.50–$212.14). The filing also reports the exercise/conversion of 120,000 derivative shares (stock options/Class B conversion entries are shown in the filing) and a separate gift of 36,000 shares to a donor-advised charitable fund.

Key Details

• Transaction date: 2026-09-25; filing date: 2026-09-28 (reporting period 9/25/2026).
• Open-market sales: 120,000 shares sold in multiple blocks for total proceeds ≈ $25,076,264. Per-share trade prices in the reported blocks ranged from about $204.50 to $212.14.
• Derivative activity: filings show exercises/conversions involving 120,000 derivative shares (exercise/conversion amounts reported at $0.00 in the filing entries). Footnote F1 notes Class B common stock is convertible into an equal number of Class A shares.
• Gift: 36,000 shares transferred to a donor-advised fund sponsored by a 501(c)(3) charity (footnote F2). Gifts typically reflect charitable intent rather than a view on the stock.
• Plan disclosure: the sales were executed pursuant to a Rule 10b5-1 trading plan adopted May 20, 2026 (footnote F3).
• Shares owned after the transactions are not specified in the provided excerpt.

Context and plain-language notes: the filing shows option/derivative exercises and conversions along with simultaneous or subsequent open-market sales — a common pattern when insiders exercise options and sell the resulting shares. The 10b5-1 plan indicates the sales were pre-arranged, which is routine and designed to avoid timing issues. The charitable gift is not a market sentiment signal. This summary is factual and does not speculate on motivations.