RBRK (RBRK) amended Form 144 lists RSU and private-share lots for resale

Rhea-AI Filing Summary

RBRK filed an amended Form 144 proposing sales of Class A Common Stock. The filing lists multiple lots of Class A shares that were acquired as compensation — Restricted Stock Units, with individual lot sizes shown by grant dates. Examples include 174,553 Class B shares acquired in a private transaction on 02/17/2021 (to be converted on sale) and individual RSU lots such as 21,652 (01/27/2026) and 19,061 (06/16/2025). The filing is an amended notice; no proceeds, prices, or aggregate offering totals are provided in the excerpt.

Insights

Corporate Securities Counsel

Amendment documents proposed resale of multiple compensation-related share lots.

The amendment lists numerous Class A Common Stock lots described as acquired as compensation — Restricted Stock Units with specific grant dates and share counts, including a large private-acquisition lot of 174,553 Class B common shares dated 02/17/2021.

Timing, price, and aggregate offering amount are not shown in the excerpt; cash‑flow treatment and distribution mechanics are therefore not stated in the provided text.

Equity Capital Markets Analyst

The filing catalogs potential resale sources but does not quantify aggregate overhang.

The schedule breaks out multiple RSU-derived lots by grant date and share count (examples: 21,652, 19,061, 13,368), which represent potential supply if sold by the holder. The private Class B lot of 174,553 is noted as convertible to Class A on sale.

Actual market impact depends on whether and how those holders elect to sell; the excerpt does not specify planned sale methods or timing.

Key Figures

Private-acquired Class B shares: 174,553 shares RSU lot: 21,652 shares RSU lot: 19,061 shares +3 more

6 metrics

Private-acquired Class B shares 174,553 shares acquired 02/17/2021; to be converted to Class A on sale

RSU lot 21,652 shares acquired as compensation on 01/27/2026

RSU lot 19,061 shares acquired as compensation on 06/16/2025

RSU lot 13,368 shares acquired as compensation on 06/16/2025

RSU lot 8,878 shares acquired as compensation on 09/15/2025

RSU lot 2,168 shares example small lots listed across grant dates

Key Terms

Restricted Stock Units, Class A Common Stock, Class B common shares, Form 144/A

4 terms

Restricted Stock Units financial

"Acquired as compensation -- Restricted Stock Units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Class A Common Stock financial

"Class A Common Stock | Goldman Sachs & Co. LLC"

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

Class B common shares financial

"Acquired Class B common shares from Issuer in private transaction"

Class B common shares are one of multiple types of a company’s ordinary stock that usually differ from other classes in voting power, dividend priority, or transferability. For investors, the difference matters because owning Class B may mean less control over corporate decisions or different income potential compared with other share classes—like having a seat with fewer votes at a board meeting while still sharing in the company’s profits.

Form 144/A regulatory

"144/A: Securities To Be Sold"

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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/A

144/A: Filer Information

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

144/A: 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/A: 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	Goldman Sachs & Co. LLC 200 West Street New York NY 10282	302007	24864236.31	157404648	06/01/2026	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/A: 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	09/16/2025	Acquired as compensation -- Restricted Stock Units	The Issuer			18889	09/16/2025	Compensation
Class A Common Stock	09/15/2025	Acquired as compensation -- Restricted Stock Units	The Issuer			8878	09/15/2025	Compensation
Class A Common Stock	09/14/2025	Acquired as compensation -- Restricted Stock Units	The Issuer			678	09/14/2025	Compensation
Class A Common Stock	09/15/2025	Acquired as compensation -- Restricted Stock Units	The Issuer			8878	09/15/2025	Compensation
Class A Common Stock	12/16/2025	Acquired as compensation -- Restricted Stock Units	The Issuer			9175	12/16/2025	Compensation
Class A Common Stock	12/15/2025	Acquired as compensation -- Restricted Stock Units	The Issuer			8618	12/15/2025	Compensation
Class A Common Stock	12/15/2025	Acquired as compensation -- Restricted Stock Units	The Issuer			9721	12/15/2025	Compensation
Class A Common Stock	12/14/2025	Acquired as compensation -- Restricted Stock Units	The Issuer			96	12/14/2025	Compensation
Class A Common Stock	06/16/2025	Acquired as compensation -- Restricted Stock Units	The Issuer			13368	06/16/2025	Compensation
Class A Common Stock	06/16/2025	Acquired as compensation -- Restricted Stock Units	The Issuer			19061	06/16/2025	Compensation
Class A Common Stock	01/27/2026	Acquired as compensation -- Restricted Stock Units	The Issuer			21652	01/27/2026	Compensation
Class A Common Stock	03/15/2026	Acquired as compensation -- Restricted Stock Units	The Issuer			8440	03/15/2026	Compensation
Class A Common Stock	02/17/2021	Acquired Class B common shares from Issuer in private transaction; Class B common shares to be converted to Class A common shares in connection with any sales	The Issuer			174553	02/17/2021	None

* 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/A: Securities Sold During The Past 3 Months

Nothing to Report

144/A: 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 RBRK's Form 144/A list for potential sales?

The amended Form 144 lists multiple lots of Class A Common Stock eligible for resale, each tied to grant dates and share counts. Examples include 174,553 Class B shares (private acquisition) and RSU lots of 21,652 and 19,061 shares, with dates shown.

Are the shares in RBRK's filing exercisable or RSUs?

Most entries are described as acquired as compensation — Restricted Stock Units. One entry is Class B common shares acquired in a private transaction on 02/17/2021 noted for conversion to Class A in connection with any sales.

Does the Form 144/A state aggregate offering size or proceeds?

The provided excerpt does not state an aggregate offering amount, offering price, or proceeds destination. The filing itemizes individual lots and dates but does not include total shares offered or price information in the excerpt.

Will the private Class B shares convert before sale?

The filing states the 174,553 Class B common shares were acquired in a private transaction and "to be converted to Class A common shares in connection with any sales," indicating conversion is tied to proposed disposition.

Do the entries indicate who receives sale proceeds?

Each listed lot is tied to the issuer as the source (e.g., compensation RSUs or private acquisition from the issuer). The excerpt does not state who will receive sale proceeds or other cash‑flow treatment.