Continental Building Products, Inc. shares jump after report of takeover talks. Compagnie de Saint-Gobain S.A. (ENXTPA:SGO) is in talks to buy Continental Building Products, Inc. and could announce a deal as soon as 12 November 2019 for the U.S. drywall maker, according to Bloomberg, citing people familiar with the matter. Following the report, Continental shares were up 12% right before the closing bell.