San Antonio-based Tesoro Petroleum said it received...

San Antonio-based Tesoro Petroleum said it received an unsolicited $15-a-share takeover offer from Pentane Partners L.P., a New York investment group. The offer from Pentane, which owns 9.7% of Tesoro’s stock and had previously said it was considering a bid for control of the company, values Tesoro at $206 million. Earlier this month, Oakville N.V., a unit of Hong Kong-based Kuo Investment Ltd., said it raised its stake in the large San Antonio-based oil and gas refiner to 6.2%. Tesoro said it had referred the unsolicited proposal to a previously established committee of its board formed to deal with such matters.