OREM — Software company Omniture Inc. said Wednesday it has agreed to acquire privately held Touch Clarity, based in London.

The deal calls for Omniture to pay up to $51.5 million, plus about $8.5 million in assumed vested stock options. It is expected to close by the end of the first quarter.

Omniture will add more than 50 employees in the move, the majority of which will continue to be based in London.

Touch Clarity's technology instructs its enterprise customers' Web sites, in real time, to deliver content and on-site promotions they should deliver to Web visitors.

Omniture said its guidance for the 2007 first quarter and full year will be adjusted, assuming the transaction closes in the first quarter. Revenue should be between $26 million and $27 million in the first quarter, with a net loss of 10 cents to 11 cents per share. Full-year revenue is expected to be $130 million to $132 million, with a net loss of 32 cents to 36 cents per share.