[Form 4] Rubrik, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Rubrik, Inc.'s Chief Financial Officer reported equity transactions involving Class A and Class B common stock. On December 16, 2025, 7,187 shares were acquired at $0 following the vesting and settlement of restricted stock units (RSUs), increasing the reported beneficial ownership to 514,738 shares. On December 17, 2025, the CFO sold 3,984 and 2,795 shares of Class A common stock at prices of $76.18 and $76.19 per share, respectively, as part of a sell-to-cover policy for tax obligations tied to RSU vesting, leaving 507,959 Class A shares owned directly. Each RSU represents one share of Class B common stock, and each Class B share held by the CFO is convertible into one Class A share, including automatic conversion upon sale or transfer.

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

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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^*

Choudary Kiran Kumar

(Last) (First) (Middle)

C/O RUBRIK INC.

3495 DEER CREEK ROAD

(Street)

PALO ALTO CA 94304

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Rubrik, Inc. [ RBRK ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
12/16/2025

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

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

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

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	12/16/2025		C		7,187	A	$0	514,738	D
Class A Common Stock	12/17/2025		S		3,984(1)	D	$76.18	510,754	D
Class A Common Stock	12/17/2025		S		2,795(1)	D	$76.19	507,959	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
Restricted Stock Units	(2)	12/16/2025		M			7,187	(3)	04/13/2029	Class B Common Stock	7,187	$0	7,188	D
Class B Common Stock	(4)	12/16/2025		M		7,187		(4)	(4)	Class A Common Stock	7,187	(4)	7,187	D
Class B Common Stock	(4)	12/16/2025		C			7,187	(4)	(4)	Class A Common Stock	7,187	(4)	0	D

Explanation of Responses:

1. This sale reported on this Form 4 was effected pursuant to the Issuer's policy requiring sell-to-cover to satisfy certain tax obligations of the Reporting Person incurred with the vesting and settlement of certain Restricted Stock Units (RSUs).

2. Each RSU represents a contingent right to receive one share of Class B Common Stock.

3. The RSUs shall vest as follows: 1/16 of the shares subject to the RSU vested on June 15, 2022, and 1/16 of the shares subject to the RSU vest every quarter thereafter, and a liquidity event-based vesting condition which was satisfied upon the effectiveness of the registration statement on Form S-1 filed by the Issuer in connection with the Issuer's initial public offering, all subject to the Reporting Person continuing to have a Service Relationship (as defined in the Issuer's Amended and Restated 2014 Stock Option and Grant Plan).

4. Each share of Class B Common Stock held by the Reporting Person will automatically convert into one share of Class A Common Stock upon the sale or transfer of such share of Class B Common Stock, subject to certain exceptions, and in certain other circumstances described in the Issuer's amended and restated certificate of incorporation. Each share of Class B Common Stock will also be convertible at any time at the option of the Reporting Person into one share of Class A Common Stock.

	/s/ Larry Guo, Attorney-in-Fact	12/18/2025
	** 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).
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FAQ

What insider transactions did Rubrik (RBRK) disclose for its CFO?

The filing shows the CFO acquired 7,187 shares via vested RSUs at $0 on December 16, 2025, then sold 3,984 and 2,795 Class A shares on December 17, 2025 at $76.18 and $76.19 per share.

How many Rubrik (RBRK) shares does the CFO own after these transactions?

After the reported transactions, the CFO beneficially owns 507,959 shares of Rubrik Class A common stock directly.

Why did the Rubrik CFO sell shares in this Form 4 filing?

The filing explains that the sale was made under Rubrik's policy requiring sell-to-cover transactions to satisfy certain tax obligations from the vesting and settlement of RSUs.

What do the Rubrik CFO’s RSUs represent in this Form 4?

Each RSU reported represents a contingent right to receive one share of Class B common stock, subject to time-based vesting and a liquidity event condition tied to Rubrik's initial public offering.

How do Rubrik Class B shares held by the CFO convert into Class A shares?

Each Class B common share automatically converts into one Class A common share upon sale or transfer, with certain exceptions, and is also convertible at any time at the CFO's option.

What is the vesting schedule for the Rubrik CFO’s RSUs in this filing?

The RSUs vest as follows: 1/16 vested on June 15, 2022, and 1/16 vest every quarter thereafter, plus a liquidity event-based condition that was satisfied upon the effectiveness of Rubrik's Form S-1 for its IPO.