=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-09-29
10b5-1 Pre-arranged Plan: Yes
--- Issuer ---
Name: Cerebras Systems Inc. (CBRS)
CIK: 0002021728
--- Reporting Owner ---
Name: Komin Robert Patrick Jr.
CIK: 0001648800
Role: Officer (Chief Financial Officer)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -1,830 | Price: $211.79
Total Value: $387,575.70
Shares Owned After: 30,670 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #2]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -2,771 | Price: $211.03
Total Value: $584,764.13
Shares Owned After: 27,899 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #3]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -2,802 | Price: $210.02
Total Value: $588,476.04
Shares Owned After: 25,097 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #4]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -2,197 | Price: $208.98
Total Value: $459,129.06
Shares Owned After: 22,900 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #5]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -700 | Price: $207.83
Total Value: $145,481.00
Shares Owned After: 22,200 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #6]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -800 | Price: $206.68
Total Value: $165,344.00
Shares Owned After: 21,400 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #7]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -600 | Price: $205.47
Total Value: $123,282.00
Shares Owned After: 20,800 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #8]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -1,600 | Price: $204.26
Total Value: $326,816.00
Shares Owned After: 19,200 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #9]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -800 | Price: $203.48
Total Value: $162,784.00
Shares Owned After: 18,400 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #10]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -400 | Price: $201.96
Total Value: $80,784.00
Shares Owned After: 18,000 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #11]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -11,200 | Price: $201.22
Total Value: $2,253,664.00
Shares Owned After: 6,800 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #12]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -1,130 | Price: $199.80
Total Value: $225,774.00
Shares Owned After: 5,670 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #13]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -870 | Price: $198.70
Total Value: $172,869.00
Shares Owned After: 4,800 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #14]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -685 | Price: $197.48
Total Value: $135,273.80
Shares Owned After: 4,115 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #15]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -1,115 | Price: $195.61
Total Value: $218,105.15
Shares Owned After: 3,000 | Ownership: D (Direct)
Footnotes:
[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
[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.
[Transaction #16]
Security: Class A Common Stock
Date: 2026-09-29 | Code: S (Open market sale)
Shares: -3,000 | Price: $194.92
Total Value: $584,760.00
Shares Owned After: 0 | Ownership: D (Direct)
Footnotes:
[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
[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.
--- Footnotes (Complete Index) ---
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
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
--- Signature ---
/s/ /s/ Robert Mills, Attorney-in-fact (2026-09-30)
