Santa Monica-based automotive pricing and information website TrueCars Inc. was this week’s biggest mover, gaining 10 percent to close at $7.83. A-Mark precious Metals, Inc. of Santa Monica was also among the week’s big movers. The precious metals dealer rose 10 percent to close at $16.10. Culver City-based NantHealth was the week’s biggest loser, dropping 10 percent to end at $12.70.