Locked-in shares of at least 10 companies could find their way into the open market in September as the deadline for investors to compulsorily hold these shares bought through pre-Initial Public Offer (IPO) placements ends. Computer Age Management (CAMS), Concord Biotech, SBFC Finance, Happiest Minds, Route Mobile, and Chemcon Speciality, are among the companies whose shares could see sellers during the month.