Thomson Reuters Corp.'s (TRI) first-quarter profit and revenue rose, helped by Thomson's purchase of Reuters last year, as well as stronger revenue at its professional and legal businesses.

But the results point to a concern for investors - Thomson Reuters' markets division - as the financial industry reels from the collapse of major investment banks. In April, Thomson Reuters acknowledged that revenue from desktops, one of its top-earning businesses, may fall this year, as widespread financial-sector job cuts begin, curbing demand. The segment's revenue edged up 0.4% in the quarter, while operating profit remained flat. Asia led revenue growth with a 5% rise. Americas revenue fell 4%.

Thomson's earnings rose to $228 million from $194 million. But per-share earnings fell to 27 cents from 30 cents as shares outstanding jumped 30% on the merger. Excluding acquisition and other impacts, profit fell to 40 cents from 44 cents.

The company's profit rose 73%, to $374 million fom $216 million a year earlier. On a per-share basis, earnings fell to 27 cents from 30 cents.

Revenue jumped 70% to $3.12 billion.

Analysts surveyed by Thomson Reuters expected earnings of 35 cents on revenue of $3.18 billion.

The company's professional business saw 5% revenue growth amid gains in online, software and services revenue.

Thomson Reuters' legal business, which includes the Westlaw research service, saw revenue increase 3%. Earnings rose 3%, helped by currency fluctuations.

Roughly 60% of Thomson Reuters' revenue comes from its financial information services unit, with the rest generated from tax and accounting, legal and scientific and health-care sectors.

The information provider also reaffirmed its 2009 outlook.

Shares closed at $31.58 on Wednesday and didn't trade premarket.

-By Mike Barris, Dow Jones Newswires; 201-938-5658; mike.barris@dowjones.com