Apollo Global Management, Inc. (NYSE:APO) is exploring a takeover of Ryder System, Inc. (NYSE:R), a transportation and logistics company, according to people with knowledge of the matter. The stock rose as much as 19%. Terms of a transaction couldn't immediately be learned, but any deal would value Ryder at a premium to the $3.4 billion market value ascribed to the company before Bloomberg News reported on a potential deal, said the people, who asked to not be identified because the matter isn't public.