Shares of videogame companies are registering big declines in Monday morning trading after President Donald J. Trump criticized the “glorification of violence” in games following the weekend's mass shootings that left 29 people dead. Shares of Activision Blizzard Inc. ATVI, +1.61% are off 6.1% in Monday's session, while shares of Take-Two Interactive Software Inc. TTWO, +1.52% are down 6.3%. Take-Two is scheduled to report quarterly earnings after the closing bell on Monday, while Activision's numbers are due out Thursday afternoon. Electronic Arts Inc.'s stock EA, +1.44% is down 4.6%, while Zynga Inc.'s stock ZNGA, +1.24% is down 3.9%. The stocks are lagging the S&P 500 SPX, +1.59% in the session, as the index is off 2.1%.