Zuckerberg Could Be Worth $28B IPO filing shows that he is Facebook's biggest shareholder By John Johnson, Newser Staff Posted Feb 1, 2012 7:40 PM CST 9 comments Comments Facebook CEO Mark Zuckerberg speaks in this Sept. 22 file photo. (Getty Images) (Newser) – So just how rich will Mark Zuckerberg be after Facebook's IPO? Very, very rich. Today's filing shows that he is the company's biggest shareholder with a 28% stake, reports the Wall Street Journal. If Facebook gets its high-end valuation of $100 billion when the stock debuts this spring, he's worth $28 billion, which the Journal notes would put him at No. 9 on the Forbes list of the world's wealthiest people. Last year, Zuckerberg earned about $1.5 million in salary, bonus, and other compensation, though he's going to take a base salary of $1 starting next year, notes TechCrunch. (Read his full letter explaining Facebook's mission in the SEC filing here.) AllThingsD, meanwhile, has the nitty gritty on what other top Facebook execs made last year, including COO Sheryl Sandberg: $382,000 in salary and bonuses, plus $30.5 million in stock awards.