Key facts
- This page summarizes Mark Reinstra's Form 4 filing for Roblox Corp (RBLX).
- 3 reported transactions and 0 derivative rows are listed below.
- Accepted by SEC: 09 Sep 2026, 19:28.
Mark Reinstra - 08 Sep 2026 Form 4 Insider Report for Roblox Corp (RBLX)
- Reporting relationship
- Chief Legal Off. & Corp. Sec.
- Issuer ticker
- RBLX
- Reported as of
- 08 Sep 2026
- Net transaction value
- -$258,621
- SEC form
- 4
- Accepted by SEC
- 09 Sep 2026, 19:28:59 UTC
- Prior SEC filing
- 24 Aug 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Mark Reinstra
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Mark Reinstra filed Form 4 for Roblox Corp (RBLX) on 09 Sep 2026.
Change
- Previous filing in this sequence was filed on 24 Aug 2026.
- Current net transaction value: -$258,621.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001835037
Primary reporting owner
Reinstra Mark
- Relationship
- Chief Legal Off. & Corp. Sec.
- Address
- C/O ROBLOX CORPORATION, 3150 S. DELAWARE ST., SAN MATEO
- Signature
- /s/ Mark Reinstra
- Signature date
- 09 Sep 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
RBLX
transaction
Class A Common Stock
Sale
- Transaction value
- $85,048
- Shares
- -1,920
- Change %
- -0.48%
- Price
- $44.30
- Shares after
- 396,144
- Date
- 08 Sep 2026
- Ownership
- Direct
- Footnotes
- F1, F2, F3
RBLX
transaction
Class A Common Stock
Sale
- Transaction value
- $169,000
- Shares
- -3,753
- Change %
- -0.95%
- Price
- $45.03
- Shares after
- 392,391
- Date
- 08 Sep 2026
- Ownership
- Direct
- Footnotes
- F1, F3, F4
RBLX
transaction
Class A Common Stock
Sale
- Transaction value
- $4,573
- Shares
- -100
- Change %
- -0.03%
- Price
- $45.73
- Shares after
- 392,291
- Date
- 08 Sep 2026
- Ownership
- Direct
- Footnotes
- F1, F3
RBLX
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 128,006
- Date
- 08 Sep 2026
- Ownership
- See footnote
- Footnotes
- F5
RBLX
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 33,538
- Date
- 08 Sep 2026
- Ownership
- See footnote
- Footnotes
- F6
RBLX
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 12,786
- Date
- 08 Sep 2026
- Ownership
- See Footnote
- Footnotes
- F7
RBLX
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 33,538
- Date
- 08 Sep 2026
- Ownership
- See footnote
- Footnotes
- F8
RBLX
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 12,786
- Date
- 08 Sep 2026
- Ownership
- See Footnote
- Footnotes
- F9
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Rule 10b5-1 trading plan
These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.
Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).
Explanation of responses 9 footnotes
Footnote F1
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.
Footnote F2
The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $43.71 to $44.67, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
Footnote F3
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.
Footnote F4
The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.71 to $45.63, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
Footnote F5
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.
Footnote F6
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.
Footnote F7
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.
Footnote F8
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.
Footnote F9
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.