Fiat Chrysler and PCA (Peugeot Citroen) merger proposed
Those two companies are proposing a merger where each company would own about half of the new company. That would join a bunch of brands, including Maserati, Alfa Romeo, Opel, Chrysler, Jeep, Vauxhall, Peugeot, etc.
https://www.bbc.com/news/business-50246329
Nearly 10 years ago, BMW was considering buying Saab. It never happened. Instead, they agreed to sell Saab the N20 engine, a 1.6 litre 4 cylinder turbo for use in the 9-3SS replacement.
What would have happened if Saab, the car unit, was acquired by BMW? Saab would still be alive. My guess is that there would be sharing of MINI and Saab FWD platforms. That was not to be.