Software company Marimba reported a diluted net loss of 3 cents per share in first-quarter earnings. That compares to diluted net loss of 13 cents per share for the same period a year ago. The company took in revenues of $10.6 million, up 72 percent from $6.1 million for the same quarter last year. Marimba also said that its chief financial officer, Fred Gerson, will resign effective October 2000 in order to pursue personal interests. Ken Owyang, Marimba's vice president of finance and corporate controller, will assume the post.