Stocks fluctuated on Tuesday, with investors measuring upbeat earnings from the banking sector against concern from the Federal Reserve that valuations on small-cap and high-flying names might be "stretched." Fed chief Janet Yellen also told Congress the central bank could hike rates sooner than expected if the economy continues to improve. The Dow Jones Industrial Average rose 64 points to an intraday record high of 17,103.83 in the morning, but reversed direction after Yellen's comments and closed unofficially just 5 points higher. The S&P 500 dropped 3 points and the Nasdaq lost 24 points. In her monetary policy report, Yellen called valuations stretched for smaller social media and biotechnology stocks, with shares of companies including Facebook and Yahoo falling following the statement. Sign up for top Business news direct to your inbox. IN DEPTHReynolds to Buy Lorillard in $27.4 Billion Big Tobacco DealCitigroup Agrees to $7 billion Settlement in Mortgage ProbeLegal Expenses Sink Bank of America Earnings - Kate Gibson, CNBC.com