Proposed Class A stock sale; RBRK insider sold 43,500 shares (RBRK)

Rhea-AI Filing Summary

Kiran Kumar Choudary filed a Form 144 notifying a proposed sale of Class A Common Stock. The filing lists Morgan Stanley Smith Barney LLC as broker and references restricted stock units vesting under a registered plan as the securities to be sold. The disclosure also documents three sales during the past three months: 3,500 shares on 01/07/2026 for $266,711.00, 20,000 shares on 01/16/2026 for $1,353,266.24, and 20,000 shares on 02/18/2026 for $1,083,444.96.

Insights

Securities Compliance Analyst

Form 144 filed for proposed resale of Class A common stock with broker identified.

The filing names Morgan Stanley Smith Barney LLC as the executing broker and specifies sales relate to restricted stock units vesting under a registered plan. The notice documents three recent open-market dispositions totaling 43,500 shares across January–February 2026.

Timing and exact amount proposed for resale are set by the notice mechanics; cash-flow treatment and any holding-period or volume-limiting conditions are not detailed in the excerpt.

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	122820	5989931.40	157404648	03/24/2026	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 *
Class A Common Stock	03/24/2026	Restricted Stock Units vesting under registered plan	Issuer			122820	03/24/2026	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	01/07/2026	3500	266711.00
Kiran Kumar Choudary 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	01/16/2026	20000	1353266.24
Kiran Kumar Choudary 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	02/18/2026	20000	1083444.96

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 did the RBRK Form 144 disclose?

It disclosed a proposed sale of Class A Common Stock and listed Morgan Stanley Smith Barney LLC as broker. The filing ties the shares to restricted stock units vesting under a registered plan and records recent dispositions in Jan–Feb 2026.

How many shares were sold by the reporting person in the past three months?

The filing records 3,500 shares sold on 01/07/2026, 20,000 shares on 01/16/2026, and 20,000 shares on 02/18/2026, totaling 43,500 shares across the stated dates.

What proceeds were reported for the recent dispositions in the filing?

Proceeds reported include $266,711.00 for 3,500 shares (01/07/2026), $1,353,266.24 for 20,000 shares (01/16/2026), and $1,083,444.96 for 20,000 shares (02/18/2026).

Who acted as broker for the proposed sale on Form 144?

The filing lists Morgan Stanley Smith Barney LLC (1 New York Plaza, 39th Floor, New York, NY) as the broker handling the proposed sale of the Class A Common Stock tied to RSU vesting.