Sean Lie - 25 Jun 2026 Form 4 Insider Report for Cerebras Systems Inc. (CBRS)

Reporting relationship: Chief Technology Officer
Issuer ticker: CBRS
Reported as of: 25 Jun 2026
Net transaction value: -$1,706,311
SEC form: 4
Accepted by SEC: 29 Jun 2026, 16:47:02 UTC
Prior SEC filing: 13 May 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 29 Jun 2026.

Key facts

This page summarizes Sean Lie's Form 4 filing for Cerebras Systems Inc. (CBRS).
18 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 29 Jun 2026, 16:47.

Change

Previous filing in this sequence was filed on 13 May 2026.
Current net transaction value: -$1,706,311.

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: 29 Jun 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: +10,033
Change %
Price
Shares after: 10,033
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F1

CBRS transaction

Class A Common Stock

Sale

Transaction value: $418,642
Shares: -2,534
Change %: -25%
Price: $165.21
Shares after: 7,499
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F3

CBRS transaction

Class A Common Stock

Sale

Transaction value: $554,687
Shares: -3,353
Change %: -45%
Price: $165.43
Shares after: 4,146
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F4

CBRS transaction

Class A Common Stock

Sale

Transaction value: $155,634
Shares: -922
Change %: -22%
Price: $168.80
Shares after: 3,224
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F5

CBRS transaction

Class A Common Stock

Sale

Transaction value: $67,848
Shares: -400
Change %: -12%
Price: $169.62
Shares after: 2,824
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F6

CBRS transaction

Class A Common Stock

Sale

Transaction value: $18,763
Shares: -110
Change %: -3.9%
Price: $170.57
Shares after: 2,714
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F7

CBRS transaction

Class A Common Stock

Sale

Transaction value: $45,178
Shares: -263
Change %: -9.7%
Price: $171.78
Shares after: 2,451
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F8

CBRS transaction

Class A Common Stock

Sale

Transaction value: $34,632
Shares: -200
Change %: -8.2%
Price: $173.16
Shares after: 2,251
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F9

CBRS transaction

Class A Common Stock

Sale

Transaction value: $17,557
Shares: -100
Change %: -4.4%
Price: $175.57
Shares after: 2,151
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2

CBRS transaction

Class A Common Stock

Sale

Transaction value: $43,236
Shares: -242
Change %: -11%
Price: $178.66
Shares after: 1,909
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F10

CBRS transaction

Class A Common Stock

Sale

Transaction value: $54,036
Shares: -300
Change %: -16%
Price: $180.12
Shares after: 1,609
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F11

CBRS transaction

Class A Common Stock

Sale

Transaction value: $36,240
Shares: -200
Change %: -12%
Price: $181.20
Shares after: 1,409
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F12

CBRS transaction

Class A Common Stock

Sale

Transaction value: $36,514
Shares: -200
Change %: -14%
Price: $182.57
Shares after: 1,209
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F13

CBRS transaction

Class A Common Stock

Sale

Transaction value: $55,113
Shares: -300
Change %: -25%
Price: $183.71
Shares after: 909
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F14

CBRS transaction

Class A Common Stock

Sale

Transaction value: $130,284
Shares: -705
Change %: -78%
Price: $184.80
Shares after: 204
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2, F15

CBRS transaction

Class A Common Stock

Sale

Transaction value: $18,551
Shares: -100
Change %: -49%
Price: $185.51
Shares after: 104
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2

CBRS transaction

Class A Common Stock

Sale

Transaction value: $19,397
Shares: -104
Change %: -100%
Price: $186.51
Shares after: 0
Date: 25 Jun 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

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

CBRS transaction Derivative

Class B Common Stock

Conversion of derivative security

Transaction value
Shares: -10,033
Change %: -0.12%
Price
Shares after: 8,199,698
Date: 25 Jun 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 10,033
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: 25 Jun 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 15 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

These shares were sold by the Reporting Person to cover tax withholding obligations in connection with the settlement of restricted stock units, resulting in the automatic conversion of the shares into Class A Common Stock immediately prior to execution of the sale. The sale was to satisfy tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary transaction by the Reporting Person. The Reporting Person is subject to a lock-up agreement that that was entered into with underwriters in connection with the Issuer's initial public offering and expires on the earlier of (i) 6:00 a.m. Eastern Time on the second trading day following the Issuer's release of earnings for the quarter ending September 30, 2026 or (ii) November 9, 2026. The sale of shares is a permissible exemption under the terms of the lock-up agreement.

Footnote F3

The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $165.11 to $165.66, 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 F4

The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $167.17 to $167.82, 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 $168.28 to $169.25, 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 F6

The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $169.32 to $170.20, 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 $170.40 to $170.59, 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 $171.74 to $171.88, 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 $173.01 to $173.30, 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 $178.47 to $178.70, 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 $179.60 to $180.51, 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 $181.18 to $181.21, 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.

Footnote F13

The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $182.28 to $182.86, 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 F14

The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $183.51 to $184.11, 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 $184.51 to $185.24, 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.