Marchionne paid $3.32 million for the stake at about $9.90 per share, the same price Fiat S.p.A. paid for the returned shares.
The additional shares bring Marchionne's holdings in FCA and CNH to 6.8 million shares; about 0.5% of the total shares issued.
Marchionne's lead was not followed by Exor, the Agnelli family holding company that owns 30% of FCA. With 46% of the voting rights, Exor is staying on the sidelines.
In February 2015, Marchionne will receive an additional 2,333,000 shares of FCA and 366,000 shares of CNH Industrial. Some will no doubt be sold to pay taxes but Marchionne's pre-tax stake would be close to 9 million shares.