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It was actually the other way around; Marvel was a partial owner of Toy Biz. Toy Biz got their royalty-free license to create toys based on Marvel properties, by giving Marvel almost 50% ownership of Toy Biz, and 10% ownership and a spot on the board of directors to Avi Arad.

Toy Biz DID help fund Marvel Studios when it was first created, and owns quite a bit of stock in it (Presumably Avi Arad helped push this deal, as he was going to head Marvel Studios). But even though Marvel Studios' largest shareholder is Marvel Comics, it's a separate company with its own incorporation.