RBRK (NYSE: RBRK) insider files Rule 144 notice to sell 4,796 shares of Class A stock

Rhea-AI Filing Summary

Brian K McCarthy filed a Rule 144 notice to sell shares of the issuer’s Class A common stock. The planned transaction covers 4,796 shares through Morgan Stanley Smith Barney on the NYSE, with an aggregate market value of $383,152.44, compared with 151,894,462 shares of this class outstanding.

The 4,796 shares were acquired on December 16, 2025 as restricted stock units that vested under a registered compensation plan and were delivered as stock on the same date as compensation. The notice also lists recent sales of Class A common stock by McCarthy over the prior three months: 4,670 shares on September 16, 2025 for gross proceeds of $346,560.70, and three separate 10,000‑share sales on October 13, November 10, and December 10, 2025 with gross proceeds of $830,334.08, $758,954.25, and $908,313.83, respectively.

By signing the notice, the selling person represents that they do not know of any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed, and that any written Rule 10b5‑1 trading plan or trading instructions would carry that same representation as of the plan adoption or instruction date.

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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	4796	383152.44	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			4796	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
Brian K McCarthy 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	09/16/2025	4670	346560.70
Brian K McCarthy 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	10/13/2025	10000	830334.08
Brian K McCarthy 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	11/10/2025	10000	758954.25
Brian K McCarthy 3495 Deer Creek Road Palo Alto CA 94304	Class A Common Stock	12/10/2025	10000	908313.83

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 filing disclose?

The filing discloses that Brian K McCarthy intends to sell 4,796 shares of the issuer’s Class A common stock on the NYSE under Rule 144, using Morgan Stanley Smith Barney as broker.

How many RBRK Class A shares are covered by this Rule 144 notice?

The notice covers 4,796 shares of Class A common stock, with an aggregate market value of $383,152.44 at the time referenced in the filing.

When and how were the RBRK shares being sold under Rule 144 acquired?

The 4,796 shares were acquired on December 16, 2025 as restricted stock units vesting under a registered plan, and the consideration is described as compensation.

What prior RBRK share sales by Brian K McCarthy are listed in the last 3 months?

The filing lists prior sales of Class A common stock by McCarthy: 4,670 shares on September 16, 2025, and 10,000 shares on each of October 13, 2025, November 10, 2025, and December 10, 2025, with stated gross proceeds for each sale.

What were the gross proceeds of the recent RBRK share sales disclosed?

The filing reports gross proceeds of $346,560.70 for 4,670 shares on September 16, 2025, and for the 10,000‑share sales: $830,334.08 on October 13, 2025, $758,954.25 on November 10, 2025, and $908,313.83 on December 10, 2025.

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

The securities information section states that the number of Class A common stock shares outstanding is 151,894,462.

What representation does the seller make about material nonpublic information for RBRK?

By signing the notice, the selling person represents that they do not know any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed, and this also applies as of the adoption date of any Rule 10b5‑1 trading plan or trading instructions.