Among the earnings stories for Tuesday, April 30, from AP Business News:
— Health insurer Aetna Inc. said its first-quarter net income fell 4 percent as acquisition-related costs and rising health care expenses more than offset premium gains. The insurer earned $490.1 million, or $1.48 per share. Operating revenue climbed 7 percent to $9.51 billion.
— Ecolab Inc., the he water, hygiene and technology company, said that healthy margin gains, lower interest expenses and a better tax rate, along with some one-time items, helped more than triple its first-quarter net income.
— Water treatment company Xylem Inc. said that its first-quarter net income dropped 35 percent, hurt by softer demand for its products.