RBRK (RBRK) holder files Rule 144 notice to sell 7232 Class A

Rhea-AI Filing Summary

RBRK holder Kiran Kumar Choudary filed a Rule 144 notice to sell 7232 shares of Class A common stock through Morgan Stanley Smith Barney LLC on or about 12/16/2025 on the NYSE. The shares, with an aggregate market value of 577764.48, were acquired from restricted stock units that vested on 12/16/2025 as compensation under a registered plan. The issuer reported 151894462 Class A shares outstanding. Over the prior three months, Choudary disclosed several sales, including 6599 shares on 09/16/2025 for gross proceeds of 489711.79 and 3500 shares on 12/09/2025 for 320102.92.

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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
Class A Common Stock	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 39th Floor New York NY 10004	7232	577764.48	151894462	12/16/2025	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 *
Class A Common Stock	12/16/2025	Restricted Stock Units vesting under registered plan	Issuer			7232	12/16/2025	Compensation

* 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
Kiran Kumar Choudary 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	09/16/2025	6599	489711.79
Kiran Kumar Choudary 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	09/17/2025	3500	261870.00
Kiran Kumar Choudary 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	10/01/2025	3500	289369.80
Kiran Kumar Choudary 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	10/15/2025	3500	279236.00
Kiran Kumar Choudary 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	11/05/2025	3500	253015.00
Kiran Kumar Choudary 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	11/19/2025	3500	243121.00
Kiran Kumar Choudary 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	12/09/2025	3500	320102.92

144: Remarks and Signature

Remarks

Date of Notice

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 stock sale is disclosed for RBRK in this Rule 144 notice?

The notice states that 7232 shares of RBRK Class A common stock are planned to be sold through Morgan Stanley Smith Barney LLC Executive Financial Services on or about 12/16/2025 on the NYSE.

How were the RBRK shares to be sold acquired by Kiran Kumar Choudary?

The 7232 shares to be sold come from restricted stock units vesting under a registered plan, acquired on 12/16/2025 from the issuer as compensation, with the payment date also listed as 12/16/2025.

What market value and share count are associated with the planned RBRK sale?

The filing lists an aggregate market value of 577764.48 for the 7232 shares to be sold. It also reports that 151894462 shares of Class A common stock were outstanding for the issuer.

What recent RBRK stock sales by Kiran Kumar Choudary are reported?

The filing discloses several sales over the past three months, including 6599 Class A shares sold on 09/16/2025 for 489711.79 in gross proceeds and 3500 shares sold on 12/09/2025 for 320102.92 in gross proceeds.

Which broker and exchange are involved in the planned RBRK share sale?

The planned sale will be executed through Morgan Stanley Smith Barney LLC Executive Financial Services, with the securities listed for trading on the NYSE.

What representation does the seller make in the RBRK Rule 144 notice?

The seller represents by signing that they do not know any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed, consistent with the Rule 144 notice requirements.