Should you dump these mid-cap favourites as they enter FTSE 100?

Mid cap managers are reviewing some of their key holdings following the latest re-shuffle of the FTSE indices, which has seen two popular stocks promoted.

House builder Persimmon and builders' merchant Travis Perkins will move up into the blue-chip index on 21 June after a strong run of performance, it was revealed last night. The two stocks replace commodities firms Evraz - the iron miner - and Polymetal International, FTSE Group said. Last month William Hill also entered the index, replacing Xstrata after its shares were suspended following its merger with Glencore. The shake-up has forced mid-cap managers to sell some of their top holdings, with a number of other favourites also set to join the FTSE 100 in September. Derek Mitc...