Nasdaq logs best week in nearly nine months as Google jumps

It was a quiet end to an eventful week. Markets around the world rallied on Monday after Greece and its creditors agreed to a broad framework for a new loan program. Stronger quarterly earnings reports from a range of big U.S. companies, including Citigroup and JPMorgan Chase, added more encouragement.

"It appears the sky is clearing," said Linda Duessel, senior equity strategist at Federated Investors.

US stocks open higher as Citi, others report strong earnings

Citigroup, Intel, Netflix and eBay all rose in early trading Thursday after reporting results that beat analysts' forecasts.

European markets also rose after Greece's parliament approved pension reforms, tax increases and other measures demanded by its creditors.

The Dow Jones industrial average was up 62 points, or 0.3 percent, at 18,107 as of 9:35 a.m. Eastern time.