Two years after the stunning arrest of Carlos Ghosn over alleged financial misconduct, discussions are underway inside Nissan Motor Co. that could fundamentally reshape the world¡¯s biggest car alliance and unwind a key part of its former chairman¡¯s legacy.

The automaker is exploring ways to sell some or all of its 34% stake in Mitsubishi Motors Corp., people with knowledge of the matter said. Concern is mounting within Nissan that it will take longer for the company to recover from the pandemic-induced crisis, said the people, who asked not to be identified because the discussions aren¡¯t public. A sale may be the first step in a broader review of the three-way alliance that also includes Renault SA, they said.

Nissan shares jumped 5.4% Monday to their highest since June, leaving the stock down 26% this year. Mitsubishi Motors shares dipped but recovered to close 2.5% higher in Tokyo. Renault shares rose as much as 4.3% in Paris.