Wikipedia says this:
Despite being owned by Sony, Psygnosis retained a degree of independence from its parent company during this period and continued to develop and publish titles for other platforms, including the
Sega Saturnand the
Nintendo 64. This caused friction between Psygnosis and Sony, and in 1996 Sony engaged
SBC Warburg's services in finding a buyer for Psygnosis. However, though bids reportedly went as high as $300 million (more than ten times what Sony paid for the company just three years before), after six months Sony rescinded its decision to sell Psygnosis. Relations between the two companies had improved during this time, and Sony became reconciled to Psygnosis releasing games for competing platforms. Shortly after, Psygnosis took over distribution of its own titles, a task that Sony had been handling following the buyout