Volume / Total Constituent Volume
 
MasterDATA - Index and ETF Composite Data
Click here to download historical composite  breadth datafiles on 30 major stock indexes and the top100 trade volume Exchange Traded Funds.

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NASDAQ Biotechnology Index - DailyVolume / Composite Volume
Volume / Composite Volume for the NASDAQ Biotechnology Index - Daily Data Period
 
 

.NBI - NASDAQ Biotechnology Index
The index was launched on November 1, 1993, when the industry was still in the midst of the original “biotech revolution” ushered in by the discovery of recombinant DNA technology and Genentech’s IPO in 1980.