(Reuters) - Amber, a vehicle of infrastructure fund I Squared Capital Advisors and TDR Capital, submitted the highest bid for Spain's Applus+, Spanish regulator CNMV said on Friday, valuing the industrial testing firm at 1.65 billion euros ($1.77 billion).

Buyout fund Apollo and Amber filed tender offers last summer, kicking off a bidding war.

Amber offered 12.78 euros per share, topping the 12.51 offered by Apollo's Manzana Bidco.

Applus shares were up 10.5% after it resumed trading after being suspended shortly before the bid values were revealed.

The company's board said this month that it favoured Amber's bid.

($1 = 0.9329 euros)

(Reporting by Joao Manuel Mauricio in Gdansk, Editing by Emma Pinedo)