i really don't know squat about who owns how much.
but the way i read the article Richard P sold MAJORITY ownership in Petty Enterprises . to me MAJORITY ownership is 50.000001% of the company.
the article states that petty has sold off portions in the past and merged with other teams but still had MAJORITY ownership until he sold it off. he still has some ownership, but probably not much, after the sale.

i guess we will find out when they have their press conference.