In particular, they have leapt more than 80 percent since October, when CEO Sergio Marchionne announced plans to spin off Ferrari and give a big chunk of the highly-prized sports car maker's shares to Fiat Chrysler Automobiles (FCA) investors.
Refer to the input text as context and select the correct relationship between 'Sergio Marchionne' and 'Fiat' from the available options.
Options: headquarters location, employer, platform, legal form