Rubrik (NYSE: RBRK) trust files to sell 10,000 Rule 144 common shares

Rhea-AI Filing Summary

Rubrik shareholder John and Sandra Thompson Trust has filed a Form 144 notice to sell common stock. The trust plans to sell 10,000 common shares through Morgan Stanley Smith Barney LLC on the NYSE, with an aggregate market value of $754,700.00. The filing states that 151,894,462 common shares are outstanding.

The shares to be sold were acquired on 02/26/2014 as founder shares from the issuer, with 10,000 securities acquired on that date. The notice also lists prior Rule 10b5-1 sales over the past three months: 9,009 common shares sold on 11/03/2025 for gross proceeds of $679,708.33 and 9,009 common shares sold on 12/01/2025 for gross proceeds of $619,377.76. The signer represents they are not aware of undisclosed material adverse information about Rubrik’s operations.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	10000	754700.00	151894462	01/05/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	02/26/2014	Founders Shares	Issuers			10000	02/26/2014	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for JOHN AND SANDRA THOMPSON TRUST 3495 DEER CREEK ROAD Palo Alto CA 94304	Common	12/01/2025	9009	619377.76
10b5-1 Sales for JOHN AND SANDRA THOMPSON TRUST 3495 DEER CREEK ROAD Palo Alto CA 94304	Common	11/03/2025	9009	679708.33

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does Rubrik (RBRK) disclose in this Form 144 filing?

The Form 144 shows that the John and Sandra Thompson Trust has filed a notice of intent to sell 10,000 Rubrik common shares on the NYSE through Morgan Stanley Smith Barney LLC, with an aggregate market value of $754,700.00, and confirms that 151,894,462 common shares are outstanding.

How many Rubrik (RBRK) shares is the trust planning to sell and at what value?

The trust plans to sell 10,000 common shares of Rubrik. The filing reports an aggregate market value of $754,700.00 for these shares.

When and how did the seller acquire the Rubrik (RBRK) shares listed in this Form 144?

The 10,000 Rubrik common shares were acquired on 02/26/2014 as founder shares from the issuer. The amount of securities acquired was 10,000, with the date of payment also listed as 02/26/2014.

What prior Rubrik (RBRK) stock sales are reported for the past three months?

The filing reports two prior Rule 10b5-1 sales for the John and Sandra Thompson Trust: 9,009 common shares sold on 11/03/2025 for gross proceeds of $679,708.33 and 9,009 common shares sold on 12/01/2025 for gross proceeds of $619,377.76.

Which broker is handling the planned Rubrik (RBRK) share sale and where will it trade?

The planned sale of Rubrik common shares will be handled by Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004. The shares are listed to be sold on the NYSE.

What representation does the seller make about Rubrik (RBRK) in this Form 144?

The person for whose account the securities are to be sold represents by signing the notice that they do not know any material adverse information about the current and prospective operations of Rubrik that has not been publicly disclosed.

Are the planned Rubrik (RBRK) sales under a Rule 10b5-1 trading plan?

The filing labels the past three months’ transactions as "10b5-1 Sales" for the John and Sandra Thompson Trust, and includes a field for the Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1, indicating use of a trading plan framework.