By Rory Gallivan

LONDON--RSA Insurance Group PLC (RSA.LN) said Tuesday that it has appointed Royal Bank of Scotland Group PLC's (RBS.LN) former chief executive Stephen Hester as its CEO with immediate effect.

Martin Scicluna, chairman of RSA, who has been acting in an executive capacity pending the appointment of a chief executive, will revert to Non-Executive Chairman, RSA said.

Simon Lee resigned as chief executive of RSA in December after it warned that troubles at its Irish unit will hit 2013 earnings.

Shares at 1625 GMT, were up 2 pence, or 2.3%, at 98 pence, valuing the company at GBP3.61 billion ($5.91 billion).

Write to Rory Gallivan at rory.gallivan@wsj.com; Twitter: @RoryGallivan

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