Original: AMC Entertainment ( AMC) - Get Report shares fell sharply Thursday after the group said it plans to sell around $800 million in shares though an open market program and cautioned investors against purchasing them "unless you are prepared to incur the risk of losing all or a substantial portion of your investment." In a Securities and Exchange Commission filing published Thursday, AMC said it would look to sell 12 million class A common shares through B. Riley Securities, Inc. and Citigroup Global Markets "from time to time, through an “at-the-market” offering program." AMC raised around $430 million from the sale of 43 million shares into the open market in early May, at $9.94 each. It also sold 8.5 million shares directly to Mudrick Capital earlier this week, with the hedge fund immediately flipping the shares into the open market after reportedly citing them as "overvalued".