Arch Coal announces one-for-ten reverse stock split Arch Coal announced a one-for-ten reverse stock split of Arch's common stock. Arch's stockholders granted authority to the Arch Board of Directors to effect this reverse stock split at the company's annual meeting of stockholders on April 23. The reverse stock split is expected to take place after market close on July 27. It also is expected that Arch's common stock will begin trading on a split-adjusted basis on the New York Stock Exchange at the market open on July 28. As a result of the reverse stock split, the number of outstanding shares of Arch's common stock will be reduced from approximately 213M to approximately 21.3M.