The highly traded PowerShares QQQ (NasdaqGM: QQQ) rose to a fresh 52-week high on Thursday after the Federal Reserve announced more quantitative easing, or QE3. The Nasdaq-100 ETF is trading it its highest levels since 2000 and the dot-com crash.

Top holding Apple (NasdaqGS: AAPL) rallied to a lifetime high Thursday as investors cheered the Fed’s expanded bond-buying program. “Apple was also helped by a chorus of praise from analysts for its iPhone 5, which the company unveiled at a media event in San Francisco on Wednesday,” MarketWatch reports.

Apple is the largest stock in QQQ at 19.7% of the ETF’s portfolio.

QQQ has been outperforming the broad market in 2012.

Most of the outperformance of tech-focused ETFs has been driven by Apple and the success of the iPad and recent iPhone launches. [Nasdaq ETFs Key on Apple, iPhone 5]

“In fiscal 2011, the iPhone accounted for 40% of Apple’s total revenue, making the smartphone the company’s most important revenue driver. The iPhone is also Apple’s most important way of bolstering its presence in foreign markets and adding exposure to new international frontiers,” Benzinga reports. [Apple, Samsung Battle Felt in ETFs]

QQQ is dominated by the technology and consumer discretionary sectors. Apple makes up about 20% of holdings, causing this ETF to be influenced strongly by the company. David Zanoni for Seeking Alpha reports that  the company’s stock rose from about $400 to $680, for a gain of 70%. [Some of S&P’s Favorite Equity ETFs]

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