Carson-based manufacturer Ducommun Inc was the biggest mover this week, gaining 15.6 percent to close at $22.09. El Segundo retailer Big 5 Sporting Goods Corporation was also a big gainer, up 14.3 percent to $17.55. The week’s biggest loser was Santa Monica-based tech firm Cornerstone OnDemand Inc., which was down 23.9 percent to $31.55.