Universal Fluctuations of the S&100 Stock Index Returns

We analyze the constituents stocks of the well known Standard & Poor’s 100 index (S&P100) that are traded in the NYSE and NASDAQ markets. We observe the data collapse of the histogram of the S&P100 index fluctuations to the universal non‐parametric Bramwell‐Holdsworth‐Pinton (BHP) distribution. Since the BHP probability density function appears in several other dissimilar phenomena, our result reveals an universal feature of the stock exchange markets.