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  4. [Form 4] Cerebras Systems Inc. Insider Trading Activity

Cerebras Systems COO sells 396,000 shares

The sales were made under a Rule 10b5-1 plan adopted June 30, 2026, alongside an option exercise and share conversion.

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Form Type
4

Rhea-AI Filing Summary

Cerebras Systems Inc. (CBRS) Chief Operating Officer Dhiraj Mallick sold 396,000 Class A common shares on September 29, 2026, in 19 reported transactions, at reported weighted-average prices ranging from $194.91 to $212.93 per share. The sales were made under a Rule 10b5-1 trading plan adopted June 30, 2026. On the same date, he exercised options covering 276,000 Class B shares at $0.98 per share and converted 276,000 Class B shares into 276,000 Class A shares. His reported stock option position following the exercise was 91,370 shares.

Insights

Analyzing...

Insider Mallick Dhiraj
Role Chief Operating Officer
Sold 396,000 shs ($80.80M)
Approx. gross sale proceeds $80.80M
Type Security Shares Price Value
Exercise Stock Option F22 276,000 $0.00 $0.00
Exercise Class B Common Stock F1 276,000 $0.00 $0.00
Conversion Class B Common Stock F1 276,000 $0.00 $0.00
Conversion Class A Common Stock F1 276,000 $0.00 $0.00
Sale Class A Common Stock F2, F3 598 $212.93 $127K
Sale Class A Common Stock F2, F4 18,274 $212.20 $3.88M
Sale Class A Common Stock F2, F5 41,391 $211.29 $8.75M
Sale Class A Common Stock F2, F6 46,427 $210.27 $9.76M
Sale Class A Common Stock F2, F7 41,278 $209.33 $8.64M
Sale Class A Common Stock F2, F8 20,714 $208.38 $4.32M
Sale Class A Common Stock F2, F9 9,652 $207.06 $2.00M
Sale Class A Common Stock F2, F10 9,047 $206.13 $1.86M
Sale Class A Common Stock F2, F11 8,729 $205.17 $1.79M
Sale Class A Common Stock F2, F12 27,492 $204.17 $5.61M
Sale Class A Common Stock F2, F13 9,682 $203.37 $1.97M
Sale Class A Common Stock F2, F14 5,637 $201.91 $1.14M
Sale Class A Common Stock F2, F15 22,915 $200.96 $4.60M
Sale Class A Common Stock F2, F16 17,848 $199.89 $3.57M
Sale Class A Common Stock F2, F17 17,000 $198.96 $3.38M
Sale Class A Common Stock F2, F18 5,170 $197.85 $1.02M
Sale Class A Common Stock F2, F19 6,613 $197.05 $1.30M
Sale Class A Common Stock F2, F20 18,703 $195.56 $3.66M
Sale Class A Common Stock F2, F21 68,830 $194.91 $13.42M
Holdings After Transaction: Stock Option — 91,370 contracts (Direct); Class B Common Stock — 520,807 contracts (Direct); Class A Common Stock — 0 shares (Direct)
Footnotes (22)
  1. 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.
  2. 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
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. 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.
  11. 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.
  12. 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.
  13. 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.
  14. 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.
  15. 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.
  16. 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.
  17. 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.
  18. 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.
  19. 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.
  20. 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.
  21. 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.
  22. F22. The stock option is fully vested and exercisable.
Class A shares sold 396,000 shares 19 reported transactions on September 29, 2026
Reported weighted-average sale prices $194.91–$212.93 per share Class A share sales on September 29, 2026
Options exercised 276,000 shares Options covering Class B shares exercised on September 29, 2026
Option exercise price $0.98 per share Options exercised on September 29, 2026
Class B shares converted 276,000 shares Converted into 276,000 Class A shares on September 29, 2026
Stock option position after exercise 91,370 shares Reported following the September 29, 2026 transaction
Rule 10b5-1 trading plan regulatory
"pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person"
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
weighted average sale price financial
"represents the weighted average sale price of the shares sold"
fully vested and exercisable technical
"The stock option is fully vested and exercisable."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many CBRS shares did Dhiraj Mallick sell, and at what prices?
Dhiraj Mallick sold 396,000 Class A common shares on September 29, 2026, across 19 reported transactions. The reported weighted-average prices ranged from $194.91 to $212.93 per share, and the sales were made under a Rule 10b5-1 trading plan adopted June 30, 2026.

How many CBRS stock options did Dhiraj Mallick exercise?
He exercised options covering 276,000 Class B shares at an exercise price of $0.98 per share on September 29, 2026. The reported stock option position following the exercise was 91,370 shares.

How can CBRS Class B shares be converted into Class A shares?
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.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →
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SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
X
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Mallick Dhiraj
(Last)(First)(Middle)
C/O CEREBRAS SYSTEMS INC.
1237 E. ARQUES AVENUE
(Street)
SUNNYVALE CALIFORNIA 94085
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
Cerebras Systems Inc. [ CBRS ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Operating Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
09/29/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Class A Common Stock09/29/2026C276,000(1)A$0(1)396,000D
Class A Common Stock09/29/2026S(2)598D$212.93(3)395,402D
Class A Common Stock09/29/2026S(2)18,274D$212.2(4)377,128D
Class A Common Stock09/29/2026S(2)41,391D$211.29(5)335,737D
Class A Common Stock09/29/2026S(2)46,427D$210.27(6)289,310D
Class A Common Stock09/29/2026S(2)41,278D$209.33(7)248,032D
Class A Common Stock09/29/2026S(2)20,714D$208.38(8)227,318D
Class A Common Stock09/29/2026S(2)9,652D$207.06(9)217,666D
Class A Common Stock09/29/2026S(2)9,047D$206.13(10)208,619D
Class A Common Stock09/29/2026S(2)8,729D$205.17(11)199,890D
Class A Common Stock09/29/2026S(2)27,492D$204.17(12)172,398D
Class A Common Stock09/29/2026S(2)9,682D$203.37(13)162,716D
Class A Common Stock09/29/2026S(2)5,637D$201.91(14)157,079D
Class A Common Stock09/29/2026S(2)22,915D$200.96(15)134,164D
Class A Common Stock09/29/2026S(2)17,848D$199.89(16)116,316D
Class A Common Stock09/29/2026S(2)17,000D$198.96(17)99,316D
Class A Common Stock09/29/2026S(2)5,170D$197.85(18)94,146D
Class A Common Stock09/29/2026S(2)6,613D$197.05(19)87,533D
Class A Common Stock09/29/2026S(2)18,703D$195.56(20)68,830D
Class A Common Stock09/29/2026S(2)68,830D$194.91(21)0D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option$0.9809/29/2026M276,000 (22)07/16/2028Class B Common Stock276,000$091,370D
Class B Common Stock(1)09/29/2026M276,000 (1) (1)Class A Common Stock276,000$0796,807D
Class B Common Stock(1)09/29/2026C276,000 (1) (1)Class A Common Stock276,000$0520,807D
Explanation of Responses:
1. 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.
2. 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
3. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
11. 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.
12. 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.
13. 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.
14. 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.
15. 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.
16. 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.
17. 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.
18. 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.
19. 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.
20. 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.
21. 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.
22. The stock option is fully vested and exercisable.
Remarks:
/s/ Robert Mills, Attorney-in-fact09/30/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

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