RBRK (NYSE: RBRK) holder files to sell 33553 shares, 2680549.17

Rhea-AI Filing Summary

A shareholder of RBRK, Arvind Nithrakashyap, has filed a Rule 144 notice to sell 33553 shares of Class A common stock through Morgan Stanley Smith Barney LLC Executive Financial Services on the NYSE, with an aggregate market value of 2680549.17. The notice reports that 151894462 Class A shares are outstanding.

The shares to be sold were acquired on 12/16/2025 as restricted stock units vesting under a registered compensation plan, with 33553 shares received as compensation on that date. The filing also discloses that Nithrakashyap sold 40170 Class A shares on 09/16/2025 during the prior three months, generating gross proceeds of 2981015.70.

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

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	33553	2680549.17	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			33553	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
Arvind Nithrakashyap 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	09/16/2025	40170	2981015.70

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 does the RBRK Rule 144 notice disclose?

The notice states that shareholder Arvind Nithrakashyap intends to sell 33553 shares of RBRK Class A common stock on the NYSE through Morgan Stanley Smith Barney LLC Executive Financial Services, with an aggregate market value of 2680549.17.

How many RBRK shares are planned to be sold and when?

The Rule 144 filing covers 33553 shares of RBRK Class A common stock, with an approximate sale date of 12/16/2025 listed in the notice.

How were the RBRK shares in the Form 144 notice acquired?

The 33553 shares to be sold were acquired on 12/16/2025 as restricted stock units vesting under a registered plan, with the consideration described as compensation.

What prior RBRK share sales by this person are disclosed?

The notice reports that Arvind Nithrakashyap sold 40170 RBRK Class A shares on 09/16/2025, generating gross proceeds of 2981015.70 during the past three months.

How many RBRK Class A common shares are outstanding according to the notice?

The filing states that there are 151894462 shares of RBRK Class A common stock outstanding.

On which exchange and through which broker will the RBRK shares be sold?

The planned sale is to be executed on the NYSE through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 39th Floor, New York, NY 10004.