MarketWatch.com ( MKTW) posted a 60% jump in first-quarter revenue from a year earlier Wednesday, but swung to a loss due to acquisition costs. The financial news site posted a first-quarter net loss of $325,000, or a penny a share, in the first quarter, including $1.3 million in charges related to its Pinnacor acquisition and other unusual costs. That was down from a profit of $35,000, or breakeven on a per-share basis, in the same period a year ago. Excluding charges, MarketWatch posted earnings of $1.1 million, compared to $1 million a year earlier. Revenue grew 60% from a year ago, to $17.8 million. The company forecast earnings of 15 cents a share for the year, with net revenue in the $81 million to $83 million range. Shares of MarketWatch were recently up 5 cents, or 0.5%, to $10.90.