FilingsForm 4

Cerebras Systems COO Mallick Dhiraj sold $80.80 million of shares on Sep 29, 2026

From the public record1 min read

Published Oct 27, 2026 · 21:52 UTCFiled Sep 30, 2026

Value$80.8 million

Shares396,000

Average price$204.04

FiledSep 30

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.

Mallick Dhiraj, Cerebras Systems' Chief Operating Officer, sold 396,000 shares on Sep 29, 2026 at an average $204.04, for $80.80 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 276,000 stock options and a conversion of 276,000 Class B shares into Class A shares; after the last sale line it states 0 Class A shares held directly, and 520,807 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 June 30, 2026. The Form 4 was filed with the SEC on Sep 30, 2026.1 2 3 4 5 6 7 8 9 10 11 12 13

How each figure was checked13 facts

the reporting owner as filedMallick DhirajOur database
the reporting owner's role at Cerebras Systemsofficer (Chief Operating Officer)Our database
the side of the tradesaleOur database
shares sold396,000Our database
date of the tradeSep 29, 2026Our database
average price per share$204.04Our database
value of the sale$80.8 millionOur database
the derivative line, stock options exercisedderivative line, exercise of a derivative security (code M): 276,000 shares disposed on Sep 29, 2026 at $0 per share; held directly; 91,370 owned after the lineOur database
the line of Class A shares acquired by conversionconversion of a derivative security (code C): 276,000 shares acquired on Sep 29, 2026 at $0 per share; held directly; 396,000 owned after the lineOur database
the derivative line, Class B shares converted, with the Class B holding after itderivative line, conversion of a derivative security (code C): 276,000 shares disposed on Sep 29, 2026 at $0 per share; held directly; 520,807 owned after the lineOur database
the holding the form states after the last sale lineafter the last sale line the form states 0 shares of Class A Common Stock held directlyOur database
footnote on the trading plan the sales were made underJune 30, 2026Footnotes of the SEC EDGAR, Form 4 filed Sep 30, 2026 ↗
date the Form 4 was filedSep 30, 2026Our database

The record

Issuer: Cerebras Systems (CIK 2021728, filed as Cerebras Systems Inc.)
Form: 4
Accession: 0001628280-26-064042
Filed: Sep 30, 2026
Period of report: Sep 29, 2026
Reporting owner: Mallick Dhiraj (CIK 2039572)
Relationship: officer (Chief Operating Officer)
Rule 10b5-1 checkbox: Ticked
Line 1: C (conversion of a derivative security) · 276,000 Class A Common Stock at $0.00 · Sep 29, 2026 · acquired, directly · 396,000 held after · footnote F1
Line 2: S (sale) · 598 Class A Common Stock at $212.93 · Sep 29, 2026 · disposed, directly · 395,402 held after · footnotes F2 and F3
Line 3: S (sale) · 18,274 Class A Common Stock at $212.20 · Sep 29, 2026 · disposed, directly · 377,128 held after · footnotes F2 and F4
Line 4: S (sale) · 41,391 Class A Common Stock at $211.29 · Sep 29, 2026 · disposed, directly · 335,737 held after · footnotes F2 and F5
Line 5: S (sale) · 46,427 Class A Common Stock at $210.27 · Sep 29, 2026 · disposed, directly · 289,310 held after · footnotes F2 and F6
Line 6: S (sale) · 41,278 Class A Common Stock at $209.33 · Sep 29, 2026 · disposed, directly · 248,032 held after · footnotes F2 and F7
Line 7: S (sale) · 20,714 Class A Common Stock at $208.38 · Sep 29, 2026 · disposed, directly · 227,318 held after · footnotes F2 and F8
Line 8: S (sale) · 9,652 Class A Common Stock at $207.06 · Sep 29, 2026 · disposed, directly · 217,666 held after · footnotes F2 and F9
Line 9: S (sale) · 9,047 Class A Common Stock at $206.13 · Sep 29, 2026 · disposed, directly · 208,619 held after · footnotes F2 and F10
Line 10: S (sale) · 8,729 Class A Common Stock at $205.17 · Sep 29, 2026 · disposed, directly · 199,890 held after · footnotes F2 and F11
Line 11: S (sale) · 27,492 Class A Common Stock at $204.17 · Sep 29, 2026 · disposed, directly · 172,398 held after · footnotes F2 and F12
Line 12: S (sale) · 9,682 Class A Common Stock at $203.37 · Sep 29, 2026 · disposed, directly · 162,716 held after · footnotes F2 and F13
Line 13: S (sale) · 5,637 Class A Common Stock at $201.91 · Sep 29, 2026 · disposed, directly · 157,079 held after · footnotes F2 and F14
Line 14: S (sale) · 22,915 Class A Common Stock at $200.96 · Sep 29, 2026 · disposed, directly · 134,164 held after · footnotes F2 and F15
Line 15: S (sale) · 17,848 Class A Common Stock at $199.89 · Sep 29, 2026 · disposed, directly · 116,316 held after · footnotes F2 and F16
Line 16: S (sale) · 17,000 Class A Common Stock at $198.96 · Sep 29, 2026 · disposed, directly · 99,316 held after · footnotes F2 and F17
Line 17: S (sale) · 5,170 Class A Common Stock at $197.85 · Sep 29, 2026 · disposed, directly · 94,146 held after · footnotes F2 and F18
Line 18: S (sale) · 6,613 Class A Common Stock at $197.05 · Sep 29, 2026 · disposed, directly · 87,533 held after · footnotes F2 and F19
Line 19: S (sale) · 18,703 Class A Common Stock at $195.56 · Sep 29, 2026 · disposed, directly · 68,830 held after · footnotes F2 and F20
Line 20: S (sale) · 68,830 Class A Common Stock at $194.91 · Sep 29, 2026 · disposed, directly · 0 held after · footnotes F2 and F21
Derivative line 1: M (exercise of a derivative security) · 276,000 Stock Option at $0.00 · Sep 29, 2026 · disposed, directly · 91,370 held after · footnote F22
Derivative line 2: M (exercise of a derivative security) · 276,000 Class B Common Stock at $0.00 · Sep 29, 2026 · acquired, directly · 796,807 held after · footnote F1
Derivative line 3: C (conversion of a derivative security) · 276,000 Class B Common Stock at $0.00 · Sep 29, 2026 · disposed, directly · 520,807 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 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 June 30, 2026
Footnote F3: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $212.92 to $212.94, 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 F4: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $211.81 to $212.80, 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 $210.81 to $211.81, 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 $209.81 to $210.80, 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 $208.81 to $209.80, 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 $207.81 to $208.80, 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 $206.68 to $207.67, 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 $205.67 to $206.66, 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 $204.65 to $205.64, 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 $203.65 to $204.65, 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 sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $202.63 to $203.61, 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 F14: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $201.44 to $202.39, 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 F15: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $200.42 to $201.41, 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 F16: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $199.42 to $200.37, 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 F17: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $198.42 to $199.41, 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 F18: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $197.41 to $198.40, 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 F19: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $196.41 to $197.40, 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 F20: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $195.27 to $195.96, 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 F21: The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $194.27 to $195.26, 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 F22: The stock option is fully vested and exercisable.