Key facts
- This page summarizes Sean Lie's Form 4 filing for Cerebras Systems Inc. (CBRS).
- 15 reported transactions and 5 derivative rows are listed below.
- Accepted by SEC: 28 Sep 2026, 16:05.
Sean Lie - 25 Sep 2026 Form 4 Insider Report for Cerebras Systems Inc. (CBRS)
- Reporting relationship
- Chief Technology Officer
- Issuer ticker
- CBRS
- Reported as of
- 25 Sep 2026
- Net transaction value
- -$25,076,264
- SEC form
- 4
- Accepted by SEC
- 28 Sep 2026, 16:05:41 UTC
- Prior SEC filing
- 08 Sep 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Robert Mills, Attorney-in-Fact
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Sean Lie filed Form 4 for Cerebras Systems Inc. (CBRS) on 28 Sep 2026.
Change
- Previous filing in this sequence was filed on 08 Sep 2026.
- Current net transaction value: -$25,076,264.
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
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
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
- 28 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
- +120,000
- Change %
- +35%
- Price
- Shares after
- 465,569
- Date
- 25 Sep 2026
- Ownership
- Direct
- Footnotes
- F1
CBRS
transaction
Class A Common Stock
Gift
- Transaction value
- Shares
- -36,000
- Change %
- -7.7%
- Price
- $0.000000*
- Shares after
- 429,569
- Date
- 25 Sep 2026
- Ownership
- Direct
- Footnotes
- F2
CBRS
transaction
Class A Common Stock
Sale
- Transaction value
- $106,070
- Shares
- -500
- Change %
- -0.12%
- Price
- $212.14
- Shares after
- 429,069
- Date
- 25 Sep 2026
- Ownership
- Direct
- Footnotes
- F3, F4
CBRS
transaction
Class A Common Stock
Sale
- Transaction value
- $1,939,284
- Shares
- -9,177
- Change %
- -2.1%
- Price
- $211.32
- Shares after
- 419,892
- Date
- 25 Sep 2026
- Ownership
- Direct
- Footnotes
- F3, F5
CBRS
transaction
Class A Common Stock
Sale
- Transaction value
- $6,432,404
- Shares
- -30,565
- Change %
- -7.3%
- Price
- $210.45
- Shares after
- 389,327
- Date
- 25 Sep 2026
- Ownership
- Direct
- Footnotes
- F3, F6
CBRS
transaction
Class A Common Stock
Sale
- Transaction value
- $6,284,014
- Shares
- -29,991
- Change %
- -7.7%
- Price
- $209.53
- Shares after
- 359,336
- Date
- 25 Sep 2026
- Ownership
- Direct
- Footnotes
- F3, F7
CBRS
transaction
Class A Common Stock
Sale
- Transaction value
- $4,381,195
- Shares
- -21,022
- Change %
- -5.9%
- Price
- $208.41
- Shares after
- 338,314
- Date
- 25 Sep 2026
- Ownership
- Direct
- Footnotes
- F3, F8
CBRS
transaction
Class A Common Stock
Sale
- Transaction value
- $1,425,592
- Shares
- -6,869
- Change %
- -2%
- Price
- $207.54
- Shares after
- 331,445
- Date
- 25 Sep 2026
- Ownership
- Direct
- Footnotes
- F3, F9
CBRS
transaction
Class A Common Stock
Sale
- Transaction value
- $2,846,535
- Shares
- -13,776
- Change %
- -4.2%
- Price
- $206.63
- Shares after
- 317,669
- Date
- 25 Sep 2026
- Ownership
- Direct
- Footnotes
- F3, F10
CBRS
transaction
Class A Common Stock
Sale
- Transaction value
- $1,211,270
- Shares
- -5,900
- Change %
- -1.9%
- Price
- $205.30
- Shares after
- 311,769
- Date
- 25 Sep 2026
- Ownership
- Direct
- Footnotes
- F3, F11
CBRS
transaction
Class A Common Stock
Sale
- Transaction value
- $449,900
- Shares
- -2,200
- Change %
- -0.71%
- Price
- $204.50
- Shares after
- 309,569
- Date
- 25 Sep 2026
- Ownership
- Direct
- Footnotes
- F3, F12
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
- -116,875
- Change %
- -40%
- Price
- $0.000000*
- Shares after
- 172,146
- Date
- 25 Sep 2026
- Ownership
- Direct
- Underlying class
- Class B Common Stock
- Underlying amount
- 116,875
- Exercise price
- $5.48
- Footnotes
- F13
CBRS
transaction
Derivative
Stock Option
Options Exercise
- Transaction value
- Shares
- -3,125
- Change %
- -8.8%
- Price
- $0.000000*
- Shares after
- 32,420
- Date
- 25 Sep 2026
- Ownership
- Direct
- Underlying class
- Class B Common Stock
- Underlying amount
- 3,125
- Exercise price
- $5.02
- Footnotes
- F14
CBRS
transaction
Derivative
Class B Common Stock
Options Exercise
- Transaction value
- Shares
- +120,000
- Change %
- +1.6%
- Price
- $0.000000*
- Shares after
- 7,702,992
- Date
- 25 Sep 2026
- Ownership
- Direct
- Underlying class
- Class A Common Stock
- Underlying amount
- 120,000
- Exercise price
- Footnotes
- F1
CBRS
transaction
Derivative
Class B Common Stock
Conversion of derivative security
- Transaction value
- Shares
- -120,000
- Change %
- -1.6%
- Price
- $0.000000*
- Shares after
- 7,582,992
- Date
- 25 Sep 2026
- Ownership
- Direct
- Underlying class
- Class A Common Stock
- Underlying amount
- 120,000
- 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 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
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 14 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 36,000 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 $211.97 to $212.31, 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 $210.97 to $211.95, 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 $209.97 to $210.96, 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 F7
The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $208.97 to $209.96, 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 F8
The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $207.97 to $208.95, 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 $206.96 to $207.95, 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 $205.96 to $206.95, 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 $204.86 to $205.83, 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 $203.86 to $204.83, 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 stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024.
Footnote F14
The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2023.