* GMS ANNOUNCES SECONDARY PUBLIC OFFERING OF COMMON STOCK

* - LAUNCH OF AN UNDERWRITTEN SECONDARY PUBLIC OFFERING OF 5 MILLION SHARES OF COMMON STOCK

* SAYS SECONDARY OFFERING OF 5.00 MILLION COMMON SHARES

* - CO IS NOT SELLING ANY SHARES IN THE OFFERING AND WILL NOT RECEIVE ANY PROCEEDS FROM SALE OF SHARES BEING SOLD BY SELLING STOCKHOLDERS Source text for Eikon: Further company coverage: