Moskovitz holds 124.6 million shares in the social network, good enough for the 7.24 percent stake, according to a regulatory document filed today with the Securities and Exchange Commission. Meanwhile, Moskovitiz's former roomie, Zuckerberg, owns 29.3 percent of the company.
Last year, Moskovitz went on a mini spending spree from late August through early September, when Facebook's stock was in a major slump. At the time, the early Facebooker sold 7.5 million of his shares to pocket around $143 million from the sales.
With Facebook currently trading above $28 a share, Moskovitz's 124.6 million shares are worth more than $3.5 billion.