X0609 4 2026-09-01 0 0001315098 Roblox Corp RBLX 0001834990 Baszucki Gregory false C/O ROBLOX CORPORATION 3150 S. DELAWARE ST. SAN MATEO CA 94403 1 0 0 0 1 Class A Common Stock 2026-09-01 4 S 0 5180 40.3332 D 8948538 I See Footnotes Class A Common Stock 2026-09-01 4 S 0 3153 40.6903 D 8945385 I See Footnotes Class A Common Stock 2026-09-01 4 S 0 5181 40.333 D 1264321 I See Footnotes Class A Common Stock 2026-09-01 4 S 0 3152 40.6903 D 1261169 I See Footnotes Class A Common Stock 3889 D Class A Common Stock 869250 I See Footnotes Class A Common Stock 869250 I See Footnotes The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 Plan adopted by the Reporting Person on November 28, 2025. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.58 to $40.57, 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. These shares are held of record by the Greg and Christina Baszucki Living Trust dtd 08/18/2006 of which the Reporting Person serves as trustee. The Reporting Person may be deemed to have beneficial ownership of the shares held by the Trust. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $40.58 to $40.95, 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. These shares are held directly under a Roth IRA account for the Reporting Person (formerly known as the PENSCO Trust Co). 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 Morningstar Dynasty Trust dtd 11/13/2020 of which Bessemer Trust Company of DE, N.A. serves as trustee. The Reporting Person may be deemed to have beneficial ownership of the shares held by the Trust. These shares are held directly by the Crossbow Dynasty Trust dtd 11/13/2020 of which Bessemer Trust Company of DE, N.A. serves as trustee. The Reporting Person may be deemed to have beneficial ownership of the shares held by the Trust. /s/ Mark Reinstra Attorney-in-Fact for Gregory Baszucki 2026-09-02