We’d previously reported that Facebook Co-Founder Eduardo Saverin sold some of his shares in the company prior to its initial public offering filing with the Securities and Exchange Commission. And now, we know the buyer.

Bloomberg reported that the updated prospectus Facebook filed with the SEC Wednesday detailed the “Saverin Agreement.”

Saverin agreed to sell an undisclosed number of his shares to Digital Sky Technologies, which was already a major shareholder in the social network.

DST and its affiliates now own 5.4 percent of outstanding Facebook shares, according to the original prospectus that the social network filed on February 1.