Rule 144: Insider Sales Notice

Notice of proposed resale of company shares under Rule 144.

Rhea-AI Filing Summary

Notice of proposed resale of company shares under Rule 144. The filing lists multiple planned or reported transactions by Mark Reinstra, showing proposed or completed sales of Common shares on 04/13/2026, 05/20/2026, and 05/21/2026. The filing also lists Restricted Stock Units dated 08/20/2024 (5,530) and 11/20/2024 (448).

Insights

Securities Counsel

Rule 144 notice documents planned or recent resale activity by an affiliate.

The excerpt records sales reported under a plan described as 10b5-1, and lists three transactions: $1,080,807.82 on 04/13/2026, $782,169.62 on 05/20/2026, and $253,356.56 on 05/21/2026. The filing also shows RSU items dated 08/20/2024 (5,530) and 11/20/2024 (448).

Regulatory focus is procedural: this form notifies the market of resale under Rule 144 and documents a 10b5-1 plan. Subsequent filings would show settlement details and any court or exchange conditions if present.

Equity Capital Markets Analyst

Reported sales are modest single‑holder dispositions over recent weeks.

The excerpt lists three trade events totaling $2,116,333.44 across 04/13/2026, 05/20/2026, and 05/21/2026. It also documents RSU grant/issuance line items dated in 2024 for 5,530 and 448 units.

These entries are administrative disclosures; their market impact depends on the seller's remaining holdings and broader volume, which the excerpt does not quantify.

Key Figures

Sale proceeds (04/13/2026): $1,080,807.82 Sale proceeds (05/20/2026): $782,169.62 Sale proceeds (05/21/2026): $253,356.56 +2 more

5 metrics

Sale proceeds (04/13/2026) $1,080,807.82 Proceeds reported for a Common share sale on <date>04/13/2026</date>

Sale proceeds (05/20/2026) $782,169.62 Proceeds reported for a Common share sale on <date>05/20/2026</date>

Sale proceeds (05/21/2026) $253,356.56 Proceeds reported for a Common share sale on <date>05/21/2026</date>

RSUs dated 08/20/2024 5,530 shares Restricted Stock Units listed with date <date>08/20/2024</date>

RSUs dated 11/20/2024 448 shares Restricted Stock Units listed with date <date>11/20/2024</date>

Key Terms

10b5-1, Restricted Stock Units, Rule 144

3 terms

10b5-1 regulatory

"10b5-1 Sales for MARK REINSTRA 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.

Restricted Stock Units financial

"Restricted Stock Units | Issuer | 5530 | 08/20/2024"

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.

Rule 144 regulatory

"Filer Information | 144: Filer Information"

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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does this RBLX Form 144 filing report?

It reports proposed or completed resale transactions by an affiliate under Rule 144. The excerpt lists three sales totaling $2,116,333.44 on specific dates in April–May 2026 and shows RSU entries dated 08/20/2024 and 11/20/2024.

Who is the seller shown in the filing for RBLX?

The filing identifies Mark Reinstra as the reporting person associated with the sales. The excerpt shows his address and three sales dated 04/13/2026, 05/20/2026, and 05/21/2026 with dollar proceeds listed for each transaction.

What were the transaction amounts disclosed in the Form 144?

The excerpt shows three sales with proceeds of $1,080,807.82, $782,169.62, and $253,356.56. These amounts are reported alongside sale dates in April–May 2026 and are presented as individual transaction proceeds.

What is the significance of the 10b5-1 notation in this filing?

The filing references 10b5-1 sales, indicating transactions executed under a pre-arranged trading plan. The excerpt labels the sales as 10b5-1 for Mark Reinstra, which documents the method but does not quantify remaining holdings or trading plan terms.

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

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Accepted by SEC EDGAR 06/08/2026 - 04:38 PM EDT 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	5978	249999.96	671595792	06/08/2026	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	08/20/2024	Restricted Stock Units	Issuer			5530	08/20/2024	N/A
Common	11/20/2024	Restricted Stock Units	Issuer			448	11/20/2024	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	05/21/2026	5460	253356.56
MARK REINSTRA 3150 South Delaware Street San Mateo CA 94403	Common	05/20/2026	17275	782169.62
MARK REINSTRA 3150 South Delaware Street San Mateo CA 94403	Common	04/13/2026	18653	1080807.82

144: Remarks and Signature

Remarks
Date of Notice	06/08/2026
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)