We performed an analysis of the correlation of the stock prices of the companies that we have covered over the last two years to the broader stock market. Based on the price movements in the selected stocks and S&P 500 over the last decade, we mapped the pattern seen in the degree of correlation that is exhibited when there are changes in the overall market direction owing to change in the “perceived” macro-situation.
For the purpose of our analysis, we divided the total period under consideration (December 31, 2000 till August 31, 2010) in to four sub-periods reflecting four different market sentiments:
- Pre-crisis- Dec 31, 2000 -Dec 31, 2007 – Long-term
- Financial crisis- Jan 01, 2008 to March 09, 2009
- Rally – March 10, 2009 to April 30, 2010
- Correction – May 01, 2010 to Present
Based on the daily prices of the stocks and S&P 500 in the aforesaid periods, we calculated the following metrics to analyze the degree of correlation as well the relative price movements:
- Correlation coefficient
- Beta
- Annualized volatility
- Ratio between stock volatility and S&P 500 volatility
- Annualized return
- Z-score – calculated by dividing annualized return by annualized volatility
- Ratio between stock z-score and S&P 500 z-score
Based on the matrix obtained, we have the following key observations:




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