Shares in Ei Group, the pubs business formerly known as Enterprise Inns, jumped by 38.87% at 285.9p to lead the FTSE 250 risers after announcing it would be bought by Slug & Lettuce-owner Stonegate.
EasyJet is also ahead, up 3.1% at £10.66 after it said it expects annual pre-tax profits to meet expectations.
The FTSE 250, however, is down 0.31% at 19,553.29.
On the FTSE 100 - down 0.47% at 7,500.34 - precious metals miner Fresnillo is the biggest blue chip faller, off 3.9% at 859.9p.
The pound is edging higher against the dollar, trading at $1.2465.