S&P Dow Jones Indices announced constituent changes across the S&P 100, S&P 500 and S&P MidCap 400, with the adjustments set to take effect on September 21, 2026. Palo Alto Networks, Arista Networks, SanDisk Networks and Dell Technologies will join the S&P 100, replacing Nike, Colgate-Palmolive and Honeywell Aerospace. Bloom Energy, Illumina and Everpure will be added to the S&P 500, while HubSpot, AGNC, Corcept and Brinker will enter the S&P MidCap 400.