Sirius XM replaces Masimo in S&P MidCap 400 after Danaher acquisition deal nears completion

Sirius XM Holdings will join the S&P MidCap 400 index, replacing Masimo Corp. This change takes effect before trading opens on June 11, 2026. The replacement follows Danaher Corp.'s pending acquisition of Masimo, which is expected to close soon pending final conditions. This update reflects shifts in the midcap index due to corporate mergers and acquisitions.