Roblox (NYSE: RBLX) holder Mark Reinstra plans 6,250-share sale

Rhea-AI Filing Summary

Roblox Corp (RBLX) is the issuer for a Rule 144 notice filed in connection with planned sales of its common stock by Mark Reinstra. The notice lists a proposed sale of 6,250 shares of Roblox common stock through Morgan Stanley Smith Barney LLC, with a proposed aggregate sale price of $235,437.50 as of August 19, 2026. The shares were acquired upon the vesting of restricted stock units during the period from May 20, 2024 through August 20, 2024. The filing also details several prior sales of Roblox common stock by Mark Reinstra over the previous three months, including transactions under a Rule 10b5-1 trading plan.

Key Figures

Shares to be sold: 6,250 shares Proposed aggregate sale price: $235,437.50 Shares sold on 07/06/2026: 4,512 shares +5 more

8 metrics

Shares to be sold 6,250 shares Planned sale of Roblox common stock listed in the Form 144

Proposed aggregate sale price $235,437.50 Aggregate price for 6,250 Roblox shares in the planned sale as of 08/19/2026

Shares sold on 07/06/2026 4,512 shares 10b5-1 sale of Roblox common stock by Mark Reinstra

Aggregate proceeds on 07/06/2026 $258,733.42 Total value of 4,512 Roblox shares sold under 10b5-1

Shares sold on 06/08/2026 5,978 shares 10b5-1 sale of Roblox common stock by Mark Reinstra

Aggregate proceeds on 06/08/2026 $249,342.38 Total value of 5,978 Roblox shares sold under 10b5-1

Shares sold on 05/20/2026 17,275 shares Sale of Roblox common stock by Mark Reinstra not marked as 10b5-1

Aggregate proceeds on 05/20/2026 $782,169.62 Total value of 17,275 Roblox shares sold

Key Terms

Rule 144, restricted stock units, 10b5-1 Sales

3 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 Sales regulatory

"10b5-1 Sales for MARK REINSTRA 3150 South Delaware Street"

10b5-1 sales are pre-arranged stock-trading plans that let company insiders automatically buy or sell shares according to a fixed schedule or formula, even if they later learn confidential information. Think of it as setting up an automatic thermostat for trades: it creates a clear, documented path that can protect insiders from insider-trading accusations and gives investors a signal about predictable insider activity—though it can also simply be a way for insiders to diversify or raise cash.

FAQ

What does the Form 144 filing for RBLX by Mark Reinstra disclose?

The Form 144 for RBLX discloses that Mark Reinstra plans to sell 6,250 shares of Roblox common stock. The shares were acquired from vesting restricted stock units between May 20, 2024 and August 20, 2024, and the proposed aggregate sale price is $235,437.50.

How many Roblox (RBLX) shares does Mark Reinstra currently plan to sell under this Form 144?

Mark Reinstra plans to sell 6,250 shares of Roblox (RBLX) common stock under this Form 144. The filing lists a proposed aggregate sale price of $235,437.50, with Morgan Stanley Smith Barney LLC as the broker and a proposed sale date of August 19, 2026.

What prior Roblox (RBLX) stock sales by Mark Reinstra are reported in the last three months?

The filing lists four prior Roblox (RBLX) sales: 4,512 shares for $258,733.42 on July 6, 2026; 5,978 shares for $249,342.38 on June 8, 2026; 5,460 shares for $253,356.56 on May 21, 2026; and 17,275 shares for $782,169.62 on May 20, 2026.

Were the Roblox (RBLX) shares in the Form 144 acquired through restricted stock units?

Yes. The notice states that the Roblox (RBLX) securities to be sold were acquired upon the vesting of restricted stock units. The vesting period referenced runs from May 20, 2024 through August 20, 2024, indicating these are equity compensation-related shares.

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

Yes. The filing identifies several transactions as 10b5-1 sales for Mark Reinstra. These include sales of common stock on May 21, 2026, June 8, 2026, and July 6, 2026, each specifying share amounts and total sale values under a Rule 10b5-1 trading plan.

Which broker is handling the planned Roblox (RBLX) share sale in this Form 144?

The planned Roblox (RBLX) sale is listed through Morgan Stanley Smith Barney LLC Executive Financial Services. The Form 144 specifies a proposed sale of 6,250 common shares via this broker, with an indicated aggregate sale price of $235,437.50 and trading on the NYSE.

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

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Available on EDGAR 08/19/2026 - 04:33 PM Accepted by SEC EDGAR 08/19/2026 - 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	6250	235437.50	669992988	08/19/2026	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			6250	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
10b5-1 Sales for MARK REINSTRA 3150 South Delaware Street San Mateo CA 94403	Common	07/06/2026	4512	258733.42
10b5-1 Sales for MARK REINSTRA 3150 South Delaware Street San Mateo CA 94403	Common	06/08/2026	5978	249342.38
10b5-1 Sales for MARK REINSTRA 3150 South Delaware Street San Mateo CA 94403	Common	05/21/2026	5460	253356.56
MARK REINSTRA 3150 South Delaware Street San Mateo CA 94403	Common	05/20/2026	17275	782169.62

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 08/20/2024.
Date of Notice	08/19/2026
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)