The Los Angeles Business Journal’s index of largest local public companies rose for the week ended Aug. 26 after investors reacted to encouraging remarks by Fed Chairman Ben Bernanke about the U.S. economy.

The weighted LABJ index rose 2.2 percent to close at 108.04. Gainers outpaced decliners 112 to 55 and 15 companies were unchanged.

Sport Chalet, the La Canada Flintridge-based sporting goods chain, was among the biggest gainers, jumping 24 percent to end the week at $2.32. Staar Surgical Co., the Monrovia maker of implantable eye lenses, gained 23 percent to close at $8.25.

RealD Inc. caught investor interest in advance of the release of a 3-D version of Walt Disney Pictures “The Lion King,” which will feature limited-edition 3-D kids’ glasses. Shares gained 15.5 percent to $14.71.

OSI Systems Inc. rose 10.7 percent to $37.63. The Hawthorne company, which makes medical imaging systems, airport-security screening machines and electronic components, reported fiscal fourth quarter profit that beat analysts’ forecasts.

Among the few double-digit percentage decliners was Broadway Financial Corp., which fell 15 percent to $1.57. The L.A. holding company for Broadway Federal Bank said it would close two branches and attempt raise $10 million in capital.