BRIEF-Vertex Energy appoints Michael Sommer as manager of product sales development
Oct 11 Vertex Energy Inc :
* Vertex Energy, Inc announces the appointment of Michael Sommer as manager of product sales development Source text for Eikon: Further company coverage:
UPDATE 2-German drugmaker Stada opens books to rival bidders
* Advent won't withdraw offer after deadline-sources (Adds sources on Advent bid)
China securities regulator to focus on stability, reform
BEIJING, Feb 26 China will focus on stable development of its capital markets this year, but will press ahead to further open its markets to foreign companies, the top securities regulator said on Sunday.