Century City-based pharmaceuticals company Ritter Pharmaceuticals Inc.was this week’s biggest mover, gaining 17 percent to end at $1.97. Big 5 Sporting Goods Corp. was also among the week’s movers. The El Segundo-based sporting goods retailer gained 16 percent to end at $15.74. Patent acquisition company Marathon Patent Group was this week’s biggest loser, dropping 14 percent to end at $2.42.