Facebook Inc. director Marc Andreessen has sold nearly half his stake in the social network since Oct. 30, securities filings show.

Between Oct. 30 and Nov. 6, Andreessen sold 921,362 shares in Facebook FB, -2.24% , collecting about $96.5 million, according to three filings with the U.S. Securities and Exchange Commission. The sales, conducted under a prearranged trading plan, involved 19 transactions at prices ranging from $101.96 to $110.22 per share.