The Los Angeles Business Journal’s index of largest local public companies closed up slightly for the week ended July 8 as investors reacted to mixed economic data.

The weighted LABJ index rose 1.9 percent to 129.52, with gainers outpacing decliners 122 to 44 and 15 companies unchanged.

The biggest gainer was Pasadena industrial pipe maker Ameron International Corp., which announced it was being acquired for $772 million. Shares soared nearly 30 percent to $85.24.

MPG Office Trust Inc. jumped 23 percent to $3.52 after the Los Angeles real estate investment trust said it disposed of another non-core office tower in Irvine and refinanced a mortgage loan on a trophy office property in downtown Los Angeles.

American Apparel Inc. gained 20 percent to $1.07 following news reports that the Los Angeles apparel company would be getting an additional cash infusion from a group of Canadian investors. The company separately announced that two longtime directors had resigned and two Canadian businessmen were elected to replace them.

Hanmi Financial Corp. continued to benefit from last week’s announcement that it was canceling a potentially dilutive stock sale. Shares of the Koreatown bank holding company rose nearly 16 percent to $1.24.

Among the largest decliners was Ixia, which dropped more than 22 percent to $9.90. The Calabasas provider of IP and wireless network test products released preliminary second quarter results that were lower than expected.