By Simon Zekaria

LONDON--Pearson PLC (PSO) said Friday its longstanding chairman, Glen Moreno, is stepping down this year after nearly a decade in the role, as the U.K.-based publisher and education firm reported a rise in quarterly sales.

Mr. Moreno, 71, became chairman in October 2005 and will depart in the next 12 months, Pearson said, without disclosing a more specific time frame. The company said it is searching for his successor.

In May, Mr. Moreno will become chairman of Virgin Money, the closely held U.K. lender part-owned by billionaire entrepreneur Richard Branson.

During Mr. Moreno's chairmanship, Pearson has transformed itself from a paper-based publisher to a digital-focused education and media specialist oriented toward education markets in the U.S., as well as emerging economies like China and Brazil. He has also overseen the appointment of Chief Executive John Fallon and chaired the company during the tenure of Pearson's previous CEO Marjorie Scardino, who was in the job for 16 years.

The publisher of the salmon-colored Financial Times newspaper confirmed its financial guidance after reporting its sales in the first three months of the year rose 5% on the year, boosted by the strength of the U.S. dollar.

Ongoing sales were level at constant exchange rates compared with the same period a year earlier. Excluding exceptional items and on a reported basis, sales fell 1% to 900 million pounds ($1.36 billion).

It continued to expect to report full-year adjusted earnings per share of between 75 pence and 80 pence in 2015, up from 66.7 pence last year.

Pearson said the FT had seen "strong growth" in digital circulation, without providing figures.

"Pearson has had a solid start to the year, in line with our expectations," said Mr. Fallon.

In early trading, Pearson's shares fell more than 1%. Numis Securities downgraded the stock on valuation grounds after a strong recent run, with analyst Gareth Davies saying the update offers no surprises to investors. Still, he noted the quarter is a quiet one for the group given seasonal trading aligned to the school year.

The shares are up 17% in the year to date.

Mr. Moreno's departure follows an announcement at the end of February that the London-based group appointed Coram Williams as its chief financial officer. Mr. Coram is chief financial officer of book publisher Penguin Random House--a joint venture in which Pearson has a 47% stake. Mr. Williams will start the role on Aug. 1, replacing Robin Freestone, whose departure was announced last year.

Pearson generates more than three-quarters of its revenue from education, including textbooks and software for teachers and students in schools and higher education, with 60% of total group sales coming from North America. It is rolling out language centers across developing markets to meet the appetite for learning among aspirational, rising populations experiencing a socio-economic boom.

The company expects sales this year, excluding acquisitions and disposals, to increase for the first time in five years amid a recovery in its core education markets, including the U.S. The company has also completed a two-year restructuring plan that has hit earnings but saved the business hundreds of millions of dollars.

News Corp which owns Dow Jones & Co., publisher of The Wall Street Journal, competes with Pearson's publishing, business-news and education divisions.

Write to Simon Zekaria at simon.zekaria@wsj.com

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