144 0001725125 XXXXXXXX LIVE 0001595974 MAGNITE, INC. 001-36384 1250 Broadway, 9th Floor New York NY 10001 (212) 243-2769 ADAM L SOROCA Former Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

42756 603084.95 143215003 05/28/2026 NASDAQ Common 01/09/2026 Restricted stock vesting under a registered plan Issuer N 7745 01/09/2026 Services Rendered Common 05/15/2022 Restricted stock vesting under a registered plan Issuer N 10921 05/15/2022 Services Rendered Common 05/15/2022 Restricted stock vesting under a registered plan Issuer N 3928 05/15/2022 Services Rendered Common 05/15/2023 Restricted stock vesting under a registered plan Issuer N 4774 05/15/2023 Services Rendered Common 02/15/2023 Restricted stock vesting under a registered plan Issuer N 3042 02/15/2023 Services Rendered Common 11/15/2022 Restricted stock vesting under a registered plan Issuer N 10921 11/15/2022 Services Rendered Common 01/15/2020 Restricted stock vesting under a registered plan Issuer N 1425 01/15/2020 Services Rendered N ADAM L SOROCA

1250 Broadway, 9th Floor New York NY 10001

Common 05/27/2026 18225 250477.11 ADAM L SOROCA

1250 Broadway, 9th Floor New York NY 10001

Common 05/18/2026 18451 247975.90 05/28/2026 /s/ Adam Lee Soroca