The Dow Jones industrial average only gained a fraction of percent this week, but the Los Angeles Business Journal’s index of the 200 largest public companies was boosted by a slew of positive earnings reports. The local index gained 2.6 percent, with 120 of the companies gaining ground or staying the same.

Leading the way was shoe retailer Skechers USA Inc. The Manhattan Beach-based company reported stellar earnings, surprising Wall Street and sending its shares up 26 percent to $22.44.

Online postage retailer Stamps.com Inc. also benefited from surprising earnings. Shares gained 22 percent to $13.22.

Aerospace equipment manufacturer Teledyne Technologies Inc. also saw earnings propel its shares, this time up 21 percent to $58.39. The shares hit a 52-week high of $59 on Friday.

On the way down was Pasadena-based IndyMac Bancorp, which fell 21 percent to $3.41 as credit problems made their way through the national banks and began taking a toll on regional lenders. Shares hit a 52-week low of $3.36 on Friday.

Also stumbling was Herbalife Ltd., which said earlier this week that the Spanish government issued a health advisory regarding some of the Los Angeles health supplement makers’ products and its chief operating officer admitted to lying on his resume. Shares closed down 18 percent to $40.08.

Finally, toymaker Jakks Pacific Inc. saw its shares decline 17 percent to $24.13 after the Malibu company reported poor earnings.