In morning trading, shares fell by 19p, or 2.3%, to trade at 806p, after it announced that "results for the first six months of the year will reflect a significantly weaker advertising environment than in the same period last year".
However, shares were down across the board this morning, hit by yesterday's falls on Wall Street and the slow trading during England's World Cup match with Nigeria.
Pearson's announcement came as chief executive Marjorie Scardino made a presentation at the Merrill Lynch media conference in London today.
She said that across its network of business newspapers, including the Financial Times and Les Echoes, advertising revenues are "significantly lower than in the same period last year", as expected.
On a brighter note, its FT Interactive Data service is performing well and is expected to deliver double-digit growth for the year. It also said that FT.com remains on track to break even by the end of the year.
Other Pearson businesses, including Pearson Education and Penguin, were trading in line with expectations, it said.
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