The index provider announced the change on 13 August, in a release issued at 18:12 in New York.

Reddit enters under the Communication Services sector. It trades on the New York Stock Exchange as RDDT.

A second change follows two days later. Sun Communities replaces Webster Financial in the S&P MidCap 400 on 20 August.

The seat opened because a landlord got bought

This is an off-cycle change, and the reason matters. Equity Residential is acquiring AvalonBay Communities, and the deal is expected to complete soon.