Robert Patrick Komin Jr. - 29 Sep 2026 Form 4 Insider Report for Cerebras Systems Inc. (CBRS)

Reporting relationship: Chief Financial Officer
Issuer ticker: CBRS
Reported as of: 29 Sep 2026
Net transaction value: -$6,614,882
SEC form: 4
Accepted by SEC: 30 Sep 2026, 18:35:38 UTC
Prior SEC filing: 20 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Robert Mills, Attorney-in-fact

Key filing fact

Robert Patrick Komin Jr. filed Form 4 for Cerebras Systems Inc. (CBRS) on 30 Sep 2026.

Key facts

This page summarizes Robert Patrick Komin Jr.'s Form 4 filing for Cerebras Systems Inc. (CBRS).
16 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 30 Sep 2026, 18:35.

Change

Previous filing in this sequence was filed on 20 Aug 2026.
Current net transaction value: -$6,614,882.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001648800 Primary reporting owner

Komin Robert Patrick Jr.

Relationship: Chief Financial Officer
Address: C/O CEREBRAS SYSTEMS INC., 1237 E. ARQUES AVENUE, SUNNYVALE
Signature: /s/ Robert Mills, Attorney-in-fact
Signature date: 30 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CBRS transaction

Class A Common Stock

Sale

Transaction value: $387,576
Shares: -1,830
Change %: -5.6%
Price: $211.79
Shares after: 30,670
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F2

CBRS transaction

Class A Common Stock

Sale

Transaction value: $584,764
Shares: -2,771
Change %: -9%
Price: $211.03
Shares after: 27,899
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F3

CBRS transaction

Class A Common Stock

Sale

Transaction value: $588,476
Shares: -2,802
Change %: -10%
Price: $210.02
Shares after: 25,097
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F4

CBRS transaction

Class A Common Stock

Sale

Transaction value: $459,129
Shares: -2,197
Change %: -8.8%
Price: $208.98
Shares after: 22,900
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F5

CBRS transaction

Class A Common Stock

Sale

Transaction value: $145,481
Shares: -700
Change %: -3.1%
Price: $207.83
Shares after: 22,200
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F6

CBRS transaction

Class A Common Stock

Sale

Transaction value: $165,344
Shares: -800
Change %: -3.6%
Price: $206.68
Shares after: 21,400
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F7

CBRS transaction

Class A Common Stock

Sale

Transaction value: $123,282
Shares: -600
Change %: -2.8%
Price: $205.47
Shares after: 20,800
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F8

CBRS transaction

Class A Common Stock

Sale

Transaction value: $326,816
Shares: -1,600
Change %: -7.7%
Price: $204.26
Shares after: 19,200
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F9

CBRS transaction

Class A Common Stock

Sale

Transaction value: $162,784
Shares: -800
Change %: -4.2%
Price: $203.48
Shares after: 18,400
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F10

CBRS transaction

Class A Common Stock

Sale

Transaction value: $80,784
Shares: -400
Change %: -2.2%
Price: $201.96
Shares after: 18,000
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F11

CBRS transaction

Class A Common Stock

Sale

Transaction value: $2,253,664
Shares: -11,200
Change %: -62%
Price: $201.22
Shares after: 6,800
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F12

CBRS transaction

Class A Common Stock

Sale

Transaction value: $225,774
Shares: -1,130
Change %: -17%
Price: $199.80
Shares after: 5,670
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F13

CBRS transaction

Class A Common Stock

Sale

Transaction value: $172,869
Shares: -870
Change %: -15%
Price: $198.70
Shares after: 4,800
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F14

CBRS transaction

Class A Common Stock

Sale

Transaction value: $135,274
Shares: -685
Change %: -14%
Price: $197.48
Shares after: 4,115
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F15

CBRS transaction

Class A Common Stock

Sale

Transaction value: $218,105
Shares: -1,115
Change %: -27%
Price: $195.61
Shares after: 3,000
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F16

CBRS transaction

Class A Common Stock

Sale

Transaction value: $584,760
Shares: -3,000
Change %: -100%
Price: $194.92
Shares after: 0
Date: 29 Sep 2026
Ownership: Direct
Footnotes: F1, F17

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 17 footnotes

Footnote F1

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 F2

The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $211.48 to $212.44, 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 F3

The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $210.47 to $211.44, 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 $209.45 to $210.40, 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 F5

The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $208.40 to $209.38, 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 $207.33 to $208.23, 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 $206.18 to $207.17, 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 $205.02 to $205.79, 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 $203.93 to $204.86, 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 $202.85 to $203.78, 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 $201.60 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 F12

The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $200.30 to $201.28, 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 $199.28 to $200.25, 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 $198.28 to $199.22, 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 $197.15 to $198.13, 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 $195.45 to $195.89, 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 $194.45 to $195.21, 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.