X0609 4 2026-08-19 0 0001315098 Roblox Corp RBLX 0001835037 Reinstra Mark false C/O ROBLOX CORPORATION 3150 S. DELAWARE ST. SAN MATEO CA 94403 0 1 0 0 Chief Legal Off. & Corp. Sec. 1 Class A Common Stock 2026-08-19 4 S 0 6250 40 D 415998 D Class A Common Stock 128006 I See footnote Class A Common Stock 12786 I See Footnote Class A Common Stock 12786 I See Footnote Class A Common Stock 33538 I See footnote Class A Common Stock 33538 I See footnote 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 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 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. 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 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. /s/ Mark Reinstra 2026-08-20