California Governor Gavin Newsom may be posting like President Donald Trump on social media, but clearly, the similarities don’t end there. The rumored presidential hopeful was a businessman before and while he ran for office, and built a brand of his own: PlumpJack Group, which he started with investors, including oil heir and billionaire Gordon Getty, a family friend. Today, PlumpJack is a power player in both Napa Valley’s wine industry and San Francisco’s social scene.

Named after the portly Shakespeare character Sir John Falstaff, PlumpJack began as a wine store in San Francisco in 1992. Newsom and his partners have since expanded it to encompass multiple wineries, restaurants, bars, stores and a hotel. Not every venture has panned out, but some have been enormously successful. The wineries alone, Forbes estimates, are worth over $400 million, so even a minority stake could be worth tens of millions of dollars to Newsom.

His exact share of each business is unclear, thanks to the vagueness of California’s financial disclosure forms. But with Newsom rumored to be gearing up for a White House bid, Forbes combed through his state financial disclosures, real estate records and PlumpJack’s websites to assemble a picture of his holdings.