Roblox (RBLX) legal chief sells shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

Roblox Corp’s Chief Legal Officer and Corporate Secretary, Mark Reinstra, reported an open‑market sale of 5,978 shares of Class A Common Stock at $41.71 per share on June 8, 2026. The filing states this trade was effected under a pre‑arranged Rule 10b5‑1 Plan adopted on February 19, 2026.

After the sale, Reinstra directly holds 426,760 Class A shares. He also has indirect holdings through several trusts, with reported positions including 16,653 shares, 33,538 shares, and 120,272 shares, where he or his spouse may be deemed to have beneficial ownership.

Insider Trade Summary 10b5-1

Net Seller: 5,978 shares ($249,342)

Net Sell 6 txns

Insider Reinstra Mark

Role Chief Legal Off. & Corp. Sec.

Sold 5,978 shs ($249K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	5,978	$41.71	$249K
holding	Class A Common Stock	--	--	--
holding	Class A Common Stock	--	--	--
holding	Class A Common Stock	--	--	--
holding	Class A Common Stock	--	--	--
holding	Class A Common Stock	--	--	--

Holdings After Transaction: Class A Common Stock — 426,760 shares (Direct, null); Class A Common Stock — 120,272 shares (Indirect, See footnote)

Footnotes (1)

1. The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 Plan adopted by the Reporting Person on February 19, 2026. A portion of these securities are Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock. These shares are held directly by the San Domenico Trust dated August 12, 1999 for which the Reporting Person serves as trustee. The Reporting Person may be deemed to have beneficial ownership over the securities held by the trust. These shares are held directly by the Mark L. Reinstra 2023 Annuity Trust for which the Reporting Person serves as trustee. The Reporting Person may be deemed to have beneficial ownership of the securities held by the Annuity Trust. These shares are held directly by the Mark L. Reinstra 2022 Annuity Trust for which the Reporting Person serves as trustee. The Reporting Person may be deemed to have beneficial ownership of the securities held by the Annuity Trust. These shares are held directly by the Susan P. Reinstra 2023 Annuity Trust for which the Reporting Person serves as trustee. The spouse of the Reporting Person may be deemed to have beneficial ownership of the securities held by the Annuity Trust. These shares are held directly by the Susan P. Reinstra 2022 Annuity Trust for which the Reporting Person serves as trustee. The spouse of the Reporting Person may be deemed to have beneficial ownership of the securities held by the Annuity Trust.

Key Figures

Shares sold: 5,978 shares Sale price: $41.71/share Direct holdings after sale: 426,760 shares +3 more

6 metrics

Shares sold 5,978 shares Open-market sale of Class A Common Stock on June 8, 2026

Sale price $41.71/share Price per share for 5,978 Class A shares sold

Direct holdings after sale 426,760 shares Class A Common Stock directly held by Mark Reinstra after transaction

Indirect holding A 16,653 shares One reported indirect Roblox Class A position via trust

Indirect holding B 33,538 shares Another reported indirect Roblox Class A position via trust

Largest indirect trust holding 120,272 shares Reported Roblox Class A position in one family annuity trust

Key Terms

Rule 10b5-1 Plan, Restricted Stock Units ("RSUs"), beneficial ownership, Annuity Trust, +1 more

5 terms

Rule 10b5-1 Plan regulatory

"The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 Plan adopted by the Reporting Person on February 19, 2026."

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

Restricted Stock Units ("RSUs") financial

"A portion of these securities are Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share..."

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

beneficial ownership regulatory

"The Reporting Person may be deemed to have beneficial ownership over the securities held by the trust."

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Annuity Trust financial

"These shares are held directly by the Mark L. Reinstra 2023 Annuity Trust for which the Reporting Person serves as trustee."

Class A Common Stock financial

"Class A Common Stock transaction of 5,978.0000 shares at 41.7100 per share is reported."

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 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Reinstra Mark

(Last) (First) (Middle)

C/O ROBLOX CORPORATION

3150 S. DELAWARE ST.

(Street)

SAN MATEO CALIFORNIA 94403

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Roblox Corp [ RBLX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Legal Off. & Corp. Sec.

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	06/08/2026		S(1)		5,978	D	$41.71	426,760(2)	D
Class A Common Stock								120,272	I	See footnote(3)
Class A Common Stock								33,538	I	See footnote(4)
Class A Common Stock								16,653	I	See Footnote(5)
Class A Common Stock								33,538	I	See footnote(6)
Class A Common Stock								16,653	I	See Footnote(7)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 Plan adopted by the Reporting Person on February 19, 2026.

2. A portion of these securities are Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock.

3. These shares are held directly by the San Domenico Trust dated August 12, 1999 for which the Reporting Person serves as trustee. The Reporting Person may be deemed to have beneficial ownership over the securities held by the trust.

4. These shares are held directly by the Mark L. Reinstra 2023 Annuity Trust for which the Reporting Person serves as trustee. The Reporting Person may be deemed to have beneficial ownership of the securities held by the Annuity Trust.

5. These shares are held directly by the Mark L. Reinstra 2022 Annuity Trust for which the Reporting Person serves as trustee. The Reporting Person may be deemed to have beneficial ownership of the securities held by the Annuity Trust.

6. These shares are held directly by the Susan P. Reinstra 2023 Annuity Trust for which the Reporting Person serves as trustee. The spouse of the Reporting Person may be deemed to have beneficial ownership of the securities held by the Annuity Trust.

7. These shares are held directly by the Susan P. Reinstra 2022 Annuity Trust for which the Reporting Person serves as trustee. The spouse of the Reporting Person may be deemed to have beneficial ownership of the securities held by the Annuity Trust.

Remarks:

	/s/ Mark Reinstra	06/08/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did Roblox (RBLX) insider Mark Reinstra report in this Form 4?

Mark Reinstra, Roblox’s Chief Legal Officer, reported selling 5,978 shares of Class A Common Stock at $41.71 per share. After the sale, he directly holds 426,760 shares and also reports several indirect trust holdings where he or his spouse may be deemed beneficial owners.

At what price did Roblox’s Mark Reinstra sell Class A shares?

He sold 5,978 Roblox Class A Common shares at $41.71 per share in an open‑market transaction. This sale occurred on June 8, 2026, and was disclosed as part of his routine insider reporting obligations under SEC Form 4 requirements for company officers.

How many Roblox shares does Mark Reinstra hold after this transaction?

Following the reported sale, Mark Reinstra directly holds 426,760 shares of Roblox Class A Common Stock. In addition, he reports indirect holdings through multiple trusts with positions such as 16,653 shares, 33,538 shares, and 120,272 shares where beneficial ownership may be attributed.

Was Roblox insider Mark Reinstra’s share sale under a Rule 10b5-1 plan?

Yes. The Form 4 footnotes state the transactions were made pursuant to a Rule 10b5‑1 trading plan adopted on February 19, 2026. Such plans are pre‑arranged programs that schedule trades in advance, helping separate personal trading timing from day‑to‑day corporate information.

What indirect Roblox shareholdings are associated with Mark Reinstra?

The filing lists several indirect positions in Roblox Class A stock through trusts, with reported holdings of 16,653 shares, 33,538 shares, another 16,653 shares, 33,538 shares, and 120,272 shares. Footnotes explain these are held by various San Domenico and Reinstra family annuity trusts.

What role does Mark Reinstra hold at Roblox related to this Form 4?

Mark Reinstra serves as Roblox’s Chief Legal Officer and Corporate Secretary, making him a reporting insider under SEC rules. As an officer, he must file Form 4s to disclose timely changes in his direct and indirect ownership of Roblox Class A Common Stock to the market.