The Los Angeles Business Journal’s index of the largest local public companies closed nearly flat for the week ended August 6 as impressive gains from industrial and consumer goods firms balanced the losses among Internet and financial firms.

The weighted LABJ index closed up 0.2 points to 117.98, with gainers outnumbering losers 95 to 84.

Among large companies, online retailers US Auto Parts Network Inc. rose 30 percent for the week after it announced the acquisition of competitor Whitney Automotive Group. The purchase puts the Carson company in position to expand in the auto accessories market.

Other big gainers included Power-One Inc., a Camarillo electric motor manufacturer, which increased its share price 24 percent; On Assignment Inc., a Calabasas staffing company that jumped 18 percent; and Herbalife Ltd., the Los Angeles health supplement company that rose 12 percent.

The biggest losers included Preferred Bank in Los Angeles, which lost 21 percent, and United Online Inc., a Woodland Hills Internet publisher that fell 15 percent. Shares of Santa Fe Financial Corp., a real estate investment firm in Los Angeles, also lost 13 percent for the week.