The Nasdaq Composite Index ( CCMP INDEX) dropped 2.4% during 2011, as per Bloomberg. Headline events contributed to stock movement in 2011, including quantitative easing, operation twist, the European sovereign debt crisis, the Greek tragedy, the "Arab Spring," U.S. Congress gridlock, Japan's catastrophe, and central banks' interventions. While the S&P index is likely to end the year without any significant change, various sub-indices escaped: the S&P 500 GAS UTIL ( S5GASU INDEX) and S&P 500 OIL&GAS ST&TR IX ( S5OGST INDEX) gained 44.2% and 42.6%, respectively. Companies like Oneok Partners ( OKS) and El Paso Corporation ( EP) led the sub index, surging 54.86% and 90.77%, respectively. The S&P 500 TRAD C&DIST ( S5TRAD Index) rose 41.6% year-to-date in 2011. Fastenal ( FAST) was the top gainer on the index, rising 46.05% in 2011. The S&P 500 MANG'D HLTH ( S5MANH INDEX) moved up 33.4%, and the top gainer of this sub index was Humana ( HUM), edging forward 60.08% until date. Among the major weight holders of the SPX index, the S&P 500 INTGR OIL&GS ( S5IOIL INDEX) has the maximum weight of 7.2%, gaining 11% following a 5.12% upsurge in oil prices, to $99.54, on Dec. 28, from $94.70 at the beginning of the year. Chevron ( CVX) topped the list, up 16.12%. Exxon Mobil ( XOM) followed, growing 15.13% during 2011. The second-highest weight holder is the pharmacy index S&P 500 PHARM ( S5PHAR INDEX) at 6.3%, rising 12.9% during the year. This growth was led by Perrigo ( PRGO) and Bristol Myers Squibb ( BMY), which showed upside of 56.17% and 32.40%, respectively. Going forward, experts are optimistic about 2012, but add that the aftershocks of 2011 will be felt. Speaking on the Federal Reserve's policies and the outlook for the U.S. economy, Hugh Johnson, chairman of Hugh Johnson Advisors LLC., told Bloomberg that markets are expected to be volatile in 2012. According to a Bloomberg UTV analyst, investors may see 12% to 20% annual return from the global stock markets and the U.S. economy will show signs of improvement, while Europe will continue to remain under pressure. Analysts also believe that if the debt crises and the recession persist, they will be detrimental to global stock markets.