Roblox (NYSE: RBLX) founder Greg Baszucki plans 8,333-share Rule 144 sale

Rhea-AI Filing Summary

Roblox Corporation insider Greg Baszucki has filed to sell up to 8,333 shares of common stock under Rule 144 through Morgan Stanley Smith Barney LLC Executive Financial Services, with an indicated value of 305,571.11 and a proposed sale date of 08/04/2026 on the NYSE.

The shares are identified as Founders Shares acquired from the issuer on 09/21/2016. Over the past three months, 10b5-1 plan sales are listed for Greg Baszucki and the Greg and Christina Baszucki Living Trust, each for 8,333 common shares on 07/01/2026, 06/01/2026, and 05/05/2026, with recorded transaction values of 480,695.77, 388,569.46, and 374,711.68 per sale.

Key Figures

Shares proposed for sale: 8,333 shares Indicated value of proposed sale: 305,571.11 Acquisition date of Founders Shares: 09/21/2016 +3 more

6 metrics

Shares proposed for sale 8,333 shares Planned Rule 144 sale of Roblox common stock via Morgan Stanley Smith Barney LLC

Indicated value of proposed sale 305,571.11 Value associated with 8,333 common shares proposed for sale on 08/04/2026

Acquisition date of Founders Shares 09/21/2016 Date the 8,333 Founders Shares were acquired from the issuer

Per-transaction shares in recent 10b5-1 sales 8,333 shares Each 10b5-1 sale by Greg Baszucki and the Living Trust in May–July 2026

10b5-1 sale value example 480,695.77 Value listed for 8,333 common shares sold on 07/01/2026

10b5-1 sale value example 374,711.68 Value listed for 8,333 common shares sold on 05/05/2026

Key Terms

10b5-1, Founders Shares, Executive Financial Services

3 terms

10b5-1 regulatory

"10b5-1 Sales for GREG BASZUCKI 3150 South Delaware Street"

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.

Founders Shares financial

"Common | 09/21/2016 | Founders Shares | Issuer"

Founders shares are a special block of a company’s stock originally given to the people who started the business; they often carry extra voting power or favorable terms compared with regular shares. For investors, these shares matter because they concentrate control and influence how future funding, ownership dilution, and decision-making will play out—think of founders shares as the steering wheel that can steer a company’s direction even as more passengers (investors) climb aboard.

Executive Financial Services financial

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

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

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Available on EDGAR 08/04/2026 - 04:36 PM Accepted by SEC EDGAR 08/04/2026 - 04:35 PM Learn about SEC filing dates

FAQ

What insider share sale is disclosed for RBLX in this Form 144?

The filing shows Greg Baszucki plans to sell up to 8,333 Roblox common shares as Founders Shares through Morgan Stanley Smith Barney LLC Executive Financial Services, with an indicated value of 305,571.11 and a proposed sale date of 08/04/2026.

How many Roblox (RBLX) shares are planned for sale and when were they acquired?

The planned sale covers 8,333 common shares of Roblox, described as Founders Shares. They were acquired from the issuer on 09/21/2016, according to the acquisition details in the disclosure.

Which broker is handling the planned Roblox (RBLX) share sale?

The planned sale of 8,333 Roblox common shares is listed through Morgan Stanley Smith Barney LLC Executive Financial Services, based at 1 New York Plaza, 8th Floor, New York, NY 10004, with trading noted for the NYSE market.

What recent 10b5-1 sales involving Roblox (RBLX) are reported?

The document lists 10b5-1 sales for Greg Baszucki and the Greg and Christina Baszucki Living Trust, each for 8,333 common shares on 07/01/2026, 06/01/2026, and 05/05/2026, with transaction values including 480,695.77, 388,569.46 and 374,711.68.

What is the indicated value of the planned Roblox (RBLX) Form 144 sale?

The proposed sale of 8,333 Roblox common shares is associated with an indicated value of 305,571.11. This figure appears alongside the share amount and NYSE listing details in the broker section of the disclosure.

Who are the selling parties linked to recent Roblox (RBLX) 10b5-1 trades?

The recent 10b5-1 trades involve Greg Baszucki individually and the Greg and Christina Baszucki Living Trust. Each is shown selling 8,333 Roblox common shares on three separate dates in 2026 with specified transaction values.

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
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	8333	305571.11	669992988	08/04/2026	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	09/21/2016	Founders Shares	Issuer			8333	09/21/2016	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 GREG BASZUCKI 3150 South Delaware Street San Mateo CA 94403	Common	07/01/2026	8333	480695.77
10b5-1 Sales for GREG AND CHRISTINA BASZUCKI LIV TR 3150 South Delaware Street San Mateo CA 94403	Common	07/01/2026	8333	480695.77
10b5-1 Sales for GREG BASZUCKI 3150 South Delaware Street San Mateo CA 94403	Common	06/01/2026	8333	388569.46
10b5-1 Sales for GREG AND CHRISTINA BASZUCKI LIV TR 3150 South Delaware Street San Mateo CA 94403	Common	06/01/2026	8333	388569.46
10b5-1 Sales for GREG BASZUCKI 3150 South Delaware Street San Mateo CA 94403	Common	05/05/2026	8333	374711.68
10b5-1 Sales for GREG AND CHRISTINA BASZUCKI LIV TR 3150 South Delaware Street San Mateo CA 94403	Common	05/05/2026	8333	374711.68

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)