Broadcaster ITV will move up to the FTSE 100 – one of a number of movements in the quarterly review of stock indexes.
Global index provider FTSE Russell confirmed the move on Wednesday, saying that Renishaw will move down to the FTSE 250 as a result.
ITV had left the FTSE 100 in September after its shares fell amid concerns about advertising revenue and the popularity of streaming platforms during the pandemic.
But its shares rebounded this year.
In May, Royal Mail entered the FTSE 100 after RSA Insurance Group was deleted following its acquisition by Danish insurer Tryg A/S.
The quarterly reviews are intended to make sure the indexes portray an accurate reflection of the market.
Also entering the FTSE 250 index are Auction Technology Group, Moonpig Group, Spire Health Group and Trustpilot Group.
Exiting the FTSE 250 are Foresight Solar Fund, JLEN Environmental Assets Group, Provident Financial, Sabre Insurance Group.
The changes will be implemented at the close of business on Friday, 18 June, and will take effect from the start of trading on Monday, 21 June.