NEW YORK — Optimists are back in control of the stock market, but they are cautious optimists.

Major stock indicators have climbed 11 percent in the past two weeks to their best levels since last fall as a series of upbeat earnings reports and forecasts boosted investors confidence about an economic recovery. Over the past 10 days, the Dow Jones industrial average jumped 947 points and broke through 9,000 for the first time since January.

On Friday, though, investors showed their conservative side, selling tech stocks and making mostly modest purchases of other shares following weak profit reports from Microsoft Corp. and www.Amazon.com Inc.