Three groups have entered bids for Saab, General Motors’ insolvent Swedish car brand, and GM will choose a preferred bidder by the end of this week in a spin-off it will largely finance itself.

Koenigsegg, the Swedish supercar maker; Renco, a private holding that bought and turned around the maker of Humvee military vehicles, and a third group of investors from the US state of Wyoming have expressed interest in Saab, according to two people briefed on the sale.