The Los Angeles Business Journal’s index of the largest local public companies closed down slightly for the week ended Aug 20 as investors reacted to news that growth in the domestic economy continues to slow.

The weighted LABJ index closed down 0.34 percent to 117.54, with decliners outpacing gainers 108 to 63.

The largest decliner was American Apparel Inc., which plunged nearly 47 percent to 75 cents after the Los Angeles manufacturer and retailer said it expects another quarterly loss and warned that it was again close to breaching a loan covenant.

MannKind Corp. fell nearly 12 percent to $5.94 after Valencia biotech said it plans to raise as much as $110 million from a complex convertible note sale that involves lending 9 million shares for Bank of America to short in order to offset risk to buyers of the notes.

U.S. China Mining Group Inc. dropped 10.5 percent to $4.16 after the City of Industry coal mining company announced a decline in second quarter net income and revenue.

Prospect Medical Holdings Inc. was one of the top gainers, jumping more than 36 percent to $8.53 after the West Los Angeles hospital owner said that it had agreed to be acquired by private equity firm Leonard Green & Partners and members of its own management team in a deal valued at $205 million.

Superior Industries International Inc. gained 12 percent to $15.10 after the Van Nuys maker of aluminum automobile wheels said it moved from a loss to a profit in the second quarter.