Back on April 11th, 2008, the NASDAQ had a market cap of $3.378 trillion, which was equal to 6.02% of the global market cap of $56.09 trillion. Today, the NASDAQ has a market cap of $12.12 trillion, which is equal to 15.25% of the global market cap of $79.47 trillion.
During the 10 year period of April 2008 through April 2018, the NASDAQ's market cap as a percentage of the global market cap increased by an average of 72 basis points per year or 6 basis points per month. However, between April 11, 2018 and September 11, 2018, the NASDAQ's market cap as a percentage of the global market cap increased by 234 basis points in only 5 months, which is 7.8X more than the recent trend.
Going all the way back to 1995, the median NASDAQ market cap as a percentage of the global market cap has been 9%. Only during 12 months of the last 285 months has the NASDAQ had a higher market cap as a percentage of the global market cap than today. The record high of 21.19% was reached in March 2000. Over the following 18 months, the NASDAQ's market cap as a percentage of the global market cap crashed back down to below the long-term median of 9%.