The Los Angeles Business Journal’s index of largest local public companies fell slightly for the week ended March 18 as investors continued to worry about the economic impact of the crisis in Japan.

The weighted LABJ index closed down 0.19 percent to 123.87, with decliners outpacing gainers 115 to 52.

Among the largest decliners was Crown Media Holdings Inc., which dropped nearly 25 percent to $1.92. A court ruling paved the way for the Studio City operator of the Hallmark Channel to recapitalize its debt into preferred stock and other securities, which would dilute holdings of some other investors.

THQ Inc. lost 23 percent to $4.85. The Agoura Hills video game publisher was hurt by negative reviews of its new game “Homefront.”

Guess Inc. fell 12 percent to $38.27. The Los Angeles retail chain was hurt by a mixed fourth quarter report and more cautious outlook for the current quarter than analysts expected.

The biggest gainer was Cornerstone OnDemand Inc., which went public on Thursday. The Santa Monica human resources software company not only priced its initial public offering higher than expected, but gained 40 percent to close at $18.25 after its first two days of trading.

Superior Industries International Inc. jumped 23.5 percent to $24.12. The Van Nuys aluminum wheel maker moved from a loss to a profit in the fourth quarter, and said the recovering automotive industry may enable it to increase production.

ReachLocal Inc. rose 19 percent to $20.68. The Woodland Hills online marketing company for small- and medium-sized businesses benefited from an analyst’s upgrade and news that it would be part of a test offering deals from local businesses to Facebook subscribers.

Los Angeles discount chain 99 Cents Only Stores continued to benefit from last week’s announcement that it had received a $1.34 billion buyout bid from its management group and a West L.A. private equity firm. Shares added another 16 percent to end the week at $19.45.