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* FTSE 100 roughly flat, FTSE 250 up 0.5%
* AstraZeneca up after hiking forecast
* Cobham soars after buyout offer
July 25 (Reuters) - A slew of mixed corporate earnings left London’s FTSE 100 little changed on Thursday, while mid-cap aerospace firm Cobham surged to a more than three-year high after a buyout offer.
The main stock market index swung between gains and losses in early deals, and was roughly flat by 0710 GMT, while the mid-cap FTSE 250 outperformed with a 0.5% rise.
AstraZeneca added 4% to top the blue-chip index after it raised its annual product sales forecast, but the gains were offset by steep, post-earnings losses in spirits company Diageo, analytics provider Relx and software provider Sage Group.
Cobham soared more than 34% to 165 pence, matching the 165 pence per share offer price from U.S. private equity group Advent International. (Reporting by Shashwat Awasthi and Muvija M in Bengaluru; Editing by Shounak Dasgupta)