[Form 4] Rubrik, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Insider Form 4 for Rubrik, Inc. (RBRK) shows that Brian K. McCarthy, identified as the company's Chief Revenue Officer, reported a transaction dated 09/29/2025 disposing of 38,860 shares of Class A common stock. The filing records the transaction code as G and lists a reported price of $0 for the disposed shares. After the reported transaction, the filing states Mr. McCarthy beneficially owned 369,139 shares.

The filing also discloses that the reported beneficial ownership total includes 367 shares purchased through the issuer's employee stock purchase plan on 09/20/2025. The Form 4 is signed on behalf of the reporting person by an attorney-in-fact, Larry Guo, dated 10/01/2025. All details above are taken directly from the submitted Form 4.

Insights

Securities Analyst

TL;DR: Routine insider transaction disclosed: an officer reported a sizable share disposal while retaining material ownership.

The Form 4 documents a single reported disposal of 38,860 Class A shares by the Chief Revenue Officer on 09/29/2025 with a post-transaction beneficial ownership of 369,139 shares. The filing uses transaction code G and shows a price of $0; the filing does not provide additional context on the reason for the disposition or the mechanics that produced the $0 price. The form also notes a small ESPP purchase of 367 shares on 09/20/2025. From a compliance and disclosure perspective, the Form 4 meets reporting requirements by itemizing the transaction and residual holdings but contains no further explanation that would alter an investor analysis.

Corporate Governance Expert

TL;DR: Disclosure appears complete for a single insider transaction; no governance red flags are evident from the form alone.

The filing explicitly identifies the reporting person as the Chief Revenue Officer and reports the exact number of shares disposed and retained. The signature by an attorney-in-fact is provided with a date. The document does not indicate any acceleration, transfer restrictions, or related-party counterparties. Because the Form 4 contains only the routine transaction details and a small ESPP purchase, it does not by itself signal governance concerns, but it also lacks narrative context about the purpose of the transaction.

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

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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).

1. Name and Address of Reporting Person^*

McCarthy Brian K.

(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 Revenue Officer

3. Date of Earliest Transaction (Month/Day/Year)
09/29/2025

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	09/29/2025		G		38,860	D	$0	369,139(1)	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

Explanation of Responses:

1. Includes 367 shares purchased through the Issuer's employee stock purchase plan on September 20, 2025.

	/s/ Larry Guo, Attorney-in-Fact	10/01/2025
	** 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).
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.

FAQ

What transaction did Brian K. McCarthy report on the Form 4 for RBRK?

The Form 4 reports a disposal of 38,860 Class A common shares on 09/29/2025 with transaction code G.

How many RBRK shares does the reporting person own after the transaction?

The filing states the reporting person beneficially owned 369,139 shares following the reported transaction.

Does the Form 4 disclose any purchases by the reporting person?

Yes; it discloses inclusion of 367 shares purchased through the issuer's employee stock purchase plan on 09/20/2025.

Who signed the Form 4 and when was it signed?

The Form 4 is signed on behalf of the reporting person by Larry Guo, Attorney-in-Fact with a signature date of 10/01/2025.

What does transaction code G mean on a Form 4?

This Form 4 lists the transaction code as G; the filing itself provides no explanatory text about the code or the transaction mechanics.