Sean Lie - 04 Sep 2026 Form 4 Insider Report for Cerebras Systems Inc. (CBRS)

Reporting relationship: Chief Technology Officer
Issuer ticker: CBRS
Reported as of: 04 Sep 2026
Net transaction value: -$11,235,154
SEC form: 4
Accepted by SEC: 08 Sep 2026, 20:19:04 UTC
Prior SEC filing: 21 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Robert Mills, Attorney-in-Fact

Key filing fact

Sean Lie filed Form 4 for Cerebras Systems Inc. (CBRS) on 08 Sep 2026.

Key facts

This page summarizes Sean Lie's Form 4 filing for Cerebras Systems Inc. (CBRS).
6 reported transactions and 4 derivative rows are listed below.
Accepted by SEC: 08 Sep 2026, 20:19.

Change

Previous filing in this sequence was filed on 21 Aug 2026.
Current net transaction value: -$11,235,154.

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 0002132472 Primary reporting owner

Lie Sean

Relationship: Chief Technology Officer
Address: C/O CEREBRAS SYSTEMS INC., 1237 E. ARQUES AVEUNE, SUNNYVALE
Signature: /s/ Robert Mills, Attorney-in-Fact
Signature date: 08 Sep 2026

Reported non-derivative transactions

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

CBRS transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +46,141
Change %: +13%
Price
Shares after: 415,067
Date: 04 Sep 2026
Ownership: Direct
Footnotes: F1

CBRS transaction

Class A Common Stock

Gift

Transaction value
Shares: -16,038
Change %: -3.9%
Price: $0.000000^*
Shares after: 399,029
Date: 04 Sep 2026
Ownership: Direct
Footnotes: F2

CBRS transaction

Class A Common Stock

Sale

Transaction value: $11,235,154
Shares: -53,460
Change %: -13%
Price: $210.16
Shares after: 345,569
Date: 04 Sep 2026
Ownership: Direct
Footnotes: F3, F4

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CBRS transaction Derivative

Stock Option

Options Exercise

Transaction value
Shares: -46,141
Change %: -14%
Price: $0.000000^*
Shares after: 289,021
Date: 04 Sep 2026
Ownership: Direct
Underlying class: Class B Common Stock
Underlying amount: 46,141
Exercise price: $5.48
Footnotes: F5

CBRS transaction Derivative

Class B Common Stock

Options Exercise

Transaction value
Shares: +46,141
Change %: +0.61%
Price: $0.000000^*
Shares after: 7,629,133
Date: 04 Sep 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 46,141
Exercise price
Footnotes: F1

CBRS transaction Derivative

Class B Common Stock

Conversion of derivative security

Transaction value
Shares: -46,141
Change %: -0.6%
Price: $0.000000^*
Shares after: 7,582,992
Date: 04 Sep 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 46,141
Exercise price
Footnotes: F1

CBRS holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 180,600
Date: 04 Sep 2026
Ownership: By Spouse
Underlying class: Class A Common Stock
Underlying amount: 180,600
Exercise price
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

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 16,038 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 $210.00 to $210.45, 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 stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024.