FilingsForm 4

Cerebras Systems CTO Sean Lie sold $25.08 million of shares on Sep 25, 2026

From the public record1 min read

Published Oct 27, 2026 · 21:52 UTCUpdated Oct 27, 2026 · 22:51 UTCFiled Sep 28, 2026

Value$25.08 million

Shares120,000

Average price$208.97

FiledSep 28

Written by Claude Sonnet 5.5, an AI model, from public records. Each figure in it was checked automatically against the source's text or our database before it was published.

Sean Lie, Cerebras Systems' Chief Technology Officer, sold 120,000 shares on Sep 25, 2026 at an average $208.97, for $25.08 million, according to a Form 4 (the form an insider files when trading the company's shares). The same day the form records an exercise of stock options for 120,000 Class B shares and their conversion into 120,000 Class A shares, and it states 309,569 Class A shares held directly after the last sale line and 7,582,992 Class B shares held directly after the conversion. A footnote says the sales were made under a Rule 10b5-1 trading plan (a pre-arranged plan for insider trades) adopted on May 20, 2026. The Form 4 was filed with the SEC on Sep 28, 2026.1 2 3 4 5 6 7 8 9 10 11 12 13

How each figure was checked13 facts

the reporting owner as filedLie SeanOur database
the reporting owner's role at Cerebras Systemsofficer (Chief Technology Officer)Our database
the side of the tradesaleOur database
shares sold120,000Our database
date of the tradeSep 25, 2026Our database
average price per share$208.97Our database
value of the sale$25.08 millionOur database
the derivative line of Class B shares acquired by exercising stock optionsderivative line, exercise of a derivative security (code M): 120,000 shares acquired on Sep 25, 2026 at $0 per share; held directly; 7,702,992 owned after the lineOur database
the derivative line of Class B shares converted, with the Class B holding after itderivative line, conversion of a derivative security (code C): 120,000 shares disposed on Sep 25, 2026 at $0 per share; held directly; 7,582,992 owned after the lineOur database
the line of Class A shares acquired by conversionconversion of a derivative security (code C): 120000 shares acquired on 2026-09-25, no price stated; held directly; 465569 owned after the lineOur database
the holding the form states after the last sale lineafter the last sale line the form states 309569 shares of Class A Common Stock held directlyOur database
footnote on the trading plan the sales were made underMay 20, 2026Footnotes of the SEC EDGAR, Form 4 filed Sep 28, 2026 ↗
date the Form 4 was filedSep 28, 2026Our database

The record

Issuer: Cerebras Systems (CIK 2021728, filed as Cerebras Systems Inc.)
Form: 4
Accession: 0001628280-26-063713
Filed: Sep 28, 2026
Period of report: Sep 25, 2026
Reporting owner: Sean Lie (CIK 2132472, filed as Lie Sean)
Relationship: officer (Chief Technology Officer)
Rule 10b5-1 checkbox: Ticked
Line 1: C (conversion of a derivative security) · 120,000 Class A Common Stock · Sep 25, 2026 · acquired, directly · 465,569 held after · footnote F1
Line 2: G (gift) · 36,000 Class A Common Stock at $0.00 · Sep 25, 2026 · disposed, directly · 429,569 held after · footnote F2
Line 3: S (sale) · 500 Class A Common Stock at $212.14 · Sep 25, 2026 · disposed, directly · 429,069 held after · footnotes F3 and F4
Line 4: S (sale) · 9,177 Class A Common Stock at $211.32 · Sep 25, 2026 · disposed, directly · 419,892 held after · footnotes F3 and F5
Line 5: S (sale) · 30,565 Class A Common Stock at $210.45 · Sep 25, 2026 · disposed, directly · 389,327 held after · footnotes F3 and F6
Line 6: S (sale) · 29,991 Class A Common Stock at $209.53 · Sep 25, 2026 · disposed, directly · 359,336 held after · footnotes F3 and F7
Line 7: S (sale) · 21,022 Class A Common Stock at $208.41 · Sep 25, 2026 · disposed, directly · 338,314 held after · footnotes F3 and F8
Line 8: S (sale) · 6,869 Class A Common Stock at $207.54 · Sep 25, 2026 · disposed, directly · 331,445 held after · footnotes F3 and F9
Line 9: S (sale) · 13,776 Class A Common Stock at $206.63 · Sep 25, 2026 · disposed, directly · 317,669 held after · footnotes F3 and F10
Line 10: S (sale) · 5,900 Class A Common Stock at $205.30 · Sep 25, 2026 · disposed, directly · 311,769 held after · footnotes F3 and F11
Line 11: S (sale) · 2,200 Class A Common Stock at $204.50 · Sep 25, 2026 · disposed, directly · 309,569 held after · footnotes F3 and F12
Derivative line 1: M (exercise of a derivative security) · 116,875 Stock Option at $0.00 · Sep 25, 2026 · disposed, directly · 172,146 held after · footnote F13
Derivative line 2: M (exercise of a derivative security) · 3,125 Stock Option at $0.00 · Sep 25, 2026 · disposed, directly · 32,420 held after · footnote F14
Derivative line 3: M (exercise of a derivative security) · 120,000 Class B Common Stock at $0.00 · Sep 25, 2026 · acquired, directly · 7,702,992 held after · footnote F1
Derivative line 4: C (conversion of a derivative security) · 120,000 Class B Common Stock at $0.00 · Sep 25, 2026 · disposed, directly · 7,582,992 held after · footnote F1
Footnote F1: The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date.
Footnote F2: The reporting person transferred 36,000 shares of the Issuer's common stock to a donor-advised fund sponsored by a charitable organization under Section 501(c)(3) of the Internal Revenue Code.
Footnote F3: The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026.
Footnote F4: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $211.97 to $212.31, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
Footnote F5: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $210.97 to $211.95, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
Footnote F6: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $209.97 to $210.96, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
Footnote F7: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $208.97 to $209.96, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
Footnote F8: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $207.97 to $208.95, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
Footnote F9: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $206.96 to $207.95, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
Footnote F10: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $205.96 to $206.95, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
Footnote F11: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $204.86 to $205.83, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
Footnote F12: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $203.86 to $204.83, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
Footnote F13: The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024.
Footnote F14: The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2023.