The Los Angeles Business Journal’s index of largest local public companies rose slightly for the week ended May 27 as investors reacted to an unexpected jump in consumer confidence.

The weighted LABJ index closed up 0.4 percent to 129.79, with decliners outpacing gainers 96 to 76.

BNK Petroleum Inc., a Camarillo oil and gas company, benefited from rising oil prices. Shares jumped more than 24 percent to $5.50.

Response Genetics Inc., a Los Angeles developer of molecular diagnostic tests for cancer, gained after a widely read financial blog heralded the company’s rising revenue and smaller loss in the first quarter. Shares rose nearly 22 percent to $2.65.

L.A. restaurant chain California Pizza Kitchen Inc. announced it would acquired by a private equity firm for $470 million, at a per-share price that was an 11 percent premium to its closing price before Wednesday’s announcement. Shares gained 11 percent to $18.44.

Among the largest decliners was Beverly Hills 3-D cinema technology company RealD Inc., which experienced a sell-off on some negative press about digital projectors and the performance of the new 3-D “Pirates of the Caribbean” movie. Shares fell 11.7 percent to $30.89.