Cerebras Systems (CBRS) COO converts 10K Class B, sells 10K Class A shares

Rhea-AI Filing Summary

Cerebras Systems Inc. Chief Operating Officer Dhiraj Mallick reported a combination of stock conversion and sale. On June 30, 2026, he converted 10,000 shares of Class B Common Stock into 10,000 shares of Class A Common Stock and sold 10,000 Class A shares in open-market transactions at a weighted average price of $206.51 per share, within a price range of $206.08 to $206.91. Following these transactions, he directly holds 10,000 shares of Class A Common Stock and 679,696 shares of Class B Common Stock, which is convertible into an equal number of Class A shares at his election with no expiration date.

Insights

Equity compensation and insider-trading analyst

COO converts 10,000 Class B shares, sells 10,000 Class A, retains large Class B stake.

The transactions show a standard convert-and-sell pattern. Dhiraj Mallick converted 10,000 Class B Common Stock into 10,000 Class A, then sold 10,000 Class A shares at a weighted average price of $206.51 on June 30, 2026.

The Form 4 notes that Class B is convertible one-for-one into Class A with no expiration, so Mallick’s remaining 679,696 Class B shares preserve substantial equity exposure. With 10,000 Class A shares also held directly and no remaining derivative position disclosed, this appears as routine liquidity rather than a full exit.

The filing indicates a net sale of 10,000 shares on that date, according to the transaction summary. Future company filings may clarify how his holdings change over time, but this single-day activity reflects a modest reduction relative to the sizable Class B position retained.

Insider Trade Summary

Net Seller: 10,000 shares ($2,065,100)

Net Sell 3 txns

Insider Mallick Dhiraj

Role Chief Operating Officer

Sold 10,000 shs ($2.07M)

Type	Security	Shares	Price	Value
Conversion	Class B Common Stock	10,000	$0.00	--
Conversion	Class A Common Stock	10,000	$0.00	--
Sale	Class A Common Stock	10,000	$206.51	$2.07M

Holdings After Transaction: Class B Common Stock — 679,696 shares (Direct, null); Class A Common Stock — 10,000 shares (Direct, null)

Footnotes (1)

1. 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. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $206.08 to $206.91, 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.

Key Figures

Class A shares sold: 10,000 shares Weighted average sale price: $206.51 per share Class B converted: 10,000 shares +2 more

5 metrics

Class A shares sold 10,000 shares Open-market sale on June 30, 2026

Weighted average sale price $206.51 per share Class A shares sold June 30, 2026

Class B converted 10,000 shares Converted into Class A Common Stock

Class A held after 10,000 shares Direct ownership following transactions

Class B held after 679,696 shares Direct ownership; convertible 1:1 to Class A

Key Terms

Class B Common Stock, weighted average sale price, derivative security, open-market sale, +1 more

5 terms

Class B Common Stock financial

"The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time"

A class B common stock is one of multiple types of a company’s ordinary shares that carries specific rights—often different voting power or dividend priority—compared with other classes. For investors it matters because those differences affect how much influence you have over company decisions, the income you might receive, and how freely the shares trade; think of it like owning a car with different keys: some keys let you start the engine and open the trunk, others only unlock the door.

weighted average sale price financial

"The sale price reported in Column 4 ... represents the weighted average sale price of the shares sold"

derivative security financial

"transaction_code_description": "Conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

conversion of derivative security financial

"transaction_code_description": "Conversion of derivative security""

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/01/2026 - 04:22 PM Accepted by SEC EDGAR 07/01/2026 - 04:21 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mallick Dhiraj

(Last) (First) (Middle)

C/O CEREBRAS SYSTEMS INC.

1237 E. ARQUES AVENUE

(Street)

SUNNYVALE CALIFORNIA 94085

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Cerebras Systems Inc. [ CBRS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Operating Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/30/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	06/30/2026		C		10,000(1)	A	(1)	10,000	D
Class A Common Stock	06/30/2026		S		10,000	D	$206.51(2)	0	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Class B Common Stock	(1)	06/30/2026		C			10,000	(1)	(1)	Class A Common Stock	10,000	$0	679,696	D

Explanation of Responses:

1. 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.

2. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $206.08 to $206.91, 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.

Remarks:

	/s/ Robert Mills, Attorney-in-fact	07/01/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Cerebras Systems (CBRS) report for COO Dhiraj Mallick?

Cerebras Systems reported that COO Dhiraj Mallick converted 10,000 shares of Class B Common Stock into 10,000 shares of Class A and sold 10,000 Class A shares in open-market trades, all on June 30, 2026, at a weighted average price of $206.51 per share.

How many Cerebras Systems (CBRS) shares did the COO sell and at what price range?

The COO sold 10,000 shares of Cerebras Systems Class A Common Stock. The weighted average sale price was $206.51 per share, with individual trade prices ranging from $206.08 to $206.91, according to the Form 4’s detailed pricing footnote disclosure.

What Cerebras Systems (CBRS) shares does the COO hold after the June 30, 2026 transactions?

After the reported transactions, the COO directly holds 10,000 shares of Class A Common Stock and 679,696 shares of Class B Common Stock. The Form 4 states these Class B shares are convertible into an equal number of Class A shares at his election with no expiration date.

How were Class B Cerebras Systems (CBRS) shares treated in this Form 4 filing?

In this Form 4, 10,000 shares of Class B Common Stock were converted into 10,000 shares of Class A Common Stock. A footnote explains that each Class B share is convertible into one Class A share at any time at the reporting person’s election and has no expiration date.

Does the Cerebras Systems (CBRS) Form 4 show a net buy or net sale by the COO?

The Form 4 transaction summary shows a net sale of 10,000 shares. This reflects the conversion of 10,000 Class B shares into Class A, followed by open-market sales of 10,000 Class A shares, resulting in a modest reduction in the COO’s overall share count.

Is there any indication of a trading plan in the Cerebras Systems (CBRS) Form 4?

The provided Form 4 excerpt does not mention any Rule 10b5-1 trading plan. The footnotes focus on the convertibility of Class B Common Stock and the weighted average sale price range for the 10,000 Class A shares sold on June 30, 2026.