RBRK (RBRK) files Form 144 listing RSU‑derived Class A share sales

Rhea-AI Filing Summary

RBRK filed a Form 144 indicating intended sales of Class A Common Stock acquired as compensation (Restricted Stock Units).

The filing lists multiple grant dates and share quantities, including 174,553 shares from 02/17/2021 and 21,652 shares from 01/27/2026, along with several other RSU grant amounts on dates in 2025 and 2026.

Insights

Securities Compliance Analyst

Forms 144 disclose planned Rule 144 sales of RSU‑derived shares by a reporting person.

The excerpt lists multiple Restricted Stock Units grants converted to Class A Common Stock with specific grant dates and share counts, the largest shown being 174,553 shares from 02/17/2021. The filing identifies the securities to be sold but does not quantify an aggregate offering amount in a single summary sentence.

Regulatory context: Form 144 provides notice of an intended sale under Rule 144 and contains grant-date and share counts. Subsequent filings or broker reporting may disclose timing, methods, and whether sales occur. Review later trade reports for executed transaction details.

Key Figures

Largest listed grant: 174,553 shares Recent listed grant: 21,652 shares Example 2025 grants: 19,061; 13,368; 8,878 shares +1 more

4 metrics

Largest listed grant 174,553 shares grant date <date>02/17/2021</date>

Recent listed grant 21,652 shares grant date <date>01/27/2026</date>

Example 2025 grants 19,061; 13,368; 8,878 shares grant dates in <date>06/2025</date> and <date>09/2025</date>

Additional 2026 grant 21,652 shares grant date <date>01/27/2026</date>

Key Terms

Restricted Stock Units, Form 144, Class A Common Stock

3 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.

Form 144 regulatory

"Filer Information | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Class A Common Stock financial

"Class A Common Stock | Securities To Be Sold"

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.

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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	Goldman Sachs & Co. LLC 200 West Street New York NY 10282	302007	25691735.49	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: 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 as compensation -- Restricted Stock Units	The Issuer			174553	02/17/2021	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

Nothing to Report

144: 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 mean for holders of Class A Common Stock?

It notifies the market that a reporting person intends to sell Class A Common Stock shares received as RSUs. The filing lists specific grant dates and share counts such as 174,553 shares (02/17/2021) and 21,652 shares (01/27/2026) as examples.

Which types of securities are listed in the RBRK Form 144 filing?

The filing lists Class A Common Stock issued upon vesting of Restricted Stock Units (RSUs). Multiple RSU grant dates and share quantities from 2021, 2025, and 2026 are shown in the excerpt.

How many shares are shown for the largest grant in the RBRK excerpt?

The largest single grant amount visible in the excerpt is 174,553 shares tied to the grant date 02/17/2021. Several smaller grant amounts from 2025 and 2026 are also listed.

Does the RBRK Form 144 provide an aggregate total of shares to be sold?

The excerpt lists individual grant dates and share counts but does not present a single aggregate registered or offered total. Readers should treat the listed grant rows as discrete entries with their own dates and amounts.