Roblox officer plans $250K sale of 5,773 shares

Roblox officer Mark Reinstra files a Rule 144 notice for a planned sale of 5,773 RBLX shares, following recent insider stock sales over the prior three months.

Rhea-AI Filing Summary

Roblox Corp (RBLX) received a notice that officer Mark Reinstra intends to sell Roblox common stock under Rule 144. The planned transaction covers 5,773 shares of common stock through Morgan Stanley Smith Barney, with an estimated aggregate sale price of $250,028.63, to be sold on the NYSE. The shares were acquired upon vesting of restricted stock units between May 20, 2024 and May 20, 2025.

Over the prior three months, Reinstra reported Rule 144 sales totaling 28,696 shares of Roblox common stock, with aggregate proceeds of approximately $1,189,520.27, including sales identified as made pursuant to a 10b5-1 trading plan.

Key Figures

Planned shares to be sold: 5,773 shares Estimated aggregate sale price (planned transaction): $250,028.63 Shares sold August 20, 2026: 17,934 shares +5 more

8 metrics

Planned shares to be sold 5,773 shares Roblox common stock to be sold under Rule 144

Estimated aggregate sale price (planned transaction) $250,028.63 Planned sale of 5,773 shares through Morgan Stanley Smith Barney

Shares sold August 20, 2026 17,934 shares Roblox common stock sold for $680,786.85

Proceeds from August 20, 2026 sale $680,786.85 Sale of 17,934 Roblox shares

Shares sold August 19, 2026 (10b5-1) 6,250 shares Roblox common stock sold for $250,000.00 under 10b5-1

Shares sold July 6, 2026 (10b5-1) 4,512 shares Roblox common stock sold for $258,733.42 under 10b5-1

Period RSUs vested May 20, 2024 – May 20, 2025 Period during which RSUs that generated the planned sale shares vested

Total shares sold in past 3 months 28,696 shares Sum of reported Roblox common stock sales over prior three months

Key Terms

Rule 144, restricted stock units, 10b5-1, Executive Financial Services

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

restricted stock units financial

"The securities to be sold were acquired upon the vesting of 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.

10b5-1 regulatory

"10b5-1 Sales for MARK REINSTRA 3150 South Delaware Street San Mateo CA 94403"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Executive Financial Services financial

"Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza"

FAQ

What does the Form 144 filing disclose for Roblox Corp (RBLX)?

The filing discloses that officer Mark Reinstra intends to sell 5,773 shares of Roblox common stock under Rule 144, with an estimated aggregate sale price of $250,028.63, and reports additional sales in the preceding three months.

How many Roblox (RBLX) shares does Mark Reinstra currently plan to sell?

Mark Reinstra currently plans to sell 5,773 shares of Roblox common stock. The notice lists an estimated aggregate sale price of $250,028.63 for these shares, to be sold through Morgan Stanley Smith Barney on the NYSE under Rule 144.

What Roblox (RBLX) insider sales did Mark Reinstra report in the past three months?

Over the past three months, Mark Reinstra reported sales of 17,934 shares on August 20, 2026 for $680,786.85, 6,250 shares on August 19, 2026 for $250,000.00, and 4,512 shares on July 6, 2026 for $258,733.42.

Were any of Mark Reinstra’s Roblox (RBLX) stock sales under a 10b5-1 plan?

Yes. The filing labels the August 19, 2026 sale of 6,250 shares for $250,000.00 and the July 6, 2026 sale of 4,512 shares for $258,733.42 as 10b5-1 sales for Mark Reinstra.

How were the Roblox (RBLX) shares to be sold by Mark Reinstra originally acquired?

The notice states that the securities to be sold were acquired upon the vesting of restricted stock units during the period from May 20, 2024 through May 20, 2025.

Which broker is handling Mark Reinstra’s planned Roblox (RBLX) share sale?

The planned sale of 5,773 shares of Roblox common stock is listed through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, New York, as the broker handling the Rule 144 transaction.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/08/2026 - 04:33 PM Accepted by SEC EDGAR 09/08/2026 - 04:32 PM Learn about SEC filing dates

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	0001835037
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Roblox Corporation
SEC File Number	001-39763
Address of Issuer	3150 South Delaware Street San Mateo CALIFORNIA 94403
Phone	8888582569
Name of Person for Whose Account the Securities are To Be Sold	MARK REINSTRA
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	Officer

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
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	5773	250028.63	669992988	09/08/2026	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 *
Common	05/20/2024	Restricted Stock Units	Issuer			5773	05/20/2024	N/A

* 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
MARK REINSTRA 3150 South Delaware Street San Mateo CA 94403	Common	08/20/2026	17934	680786.85
10b5-1 Sales for MARK REINSTRA 3150 South Delaware Street San Mateo CA 94403	Common	08/19/2026	6250	250000.00
10b5-1 Sales for MARK REINSTRA 3150 South Delaware Street San Mateo CA 94403	Common	07/06/2026	4512	258733.42

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock units during the period of 05/20/2024 through 05/20/2025.
Date of Notice	09/08/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	02/19/2026
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	/s/ Mark Reinstra
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)