Yahoo lost 7.6%, or $1.59, to $19.22 on the Nasdaq Stock Market. The online search engine's fourth-quarter profit dropped by 23% from the same period a year ago, while revenue rose 8%. The company will cut 1,000 jobs next month.

Citigroup, Oppenheimer and Pacific Crest Securities all removed their "buy" ratings from Yahoo, downgrading the shares to "neutral" calls.