The companies said the index is an accurate, real-time representation of the global clean technology sector with exposure to clean energy, energy efficiency, transport, waste management, and water companies. 

The index is composed of 119 companies identified by DBCCA from a global universe of approximately 4,000, each, with at least a third of revenues derived from clean technology within investable geographies and exchanges identified by NASDAQ OMX. Of these, 106 companies have more than 50% in clean tech revenues, using only demonstrated revenue from filed financial statements.

Constituent companies must have market capitalization of $250 million and more than $1 million average daily dollar trading volume.  The index is equal-weighted to offer greater exposure to smaller-cap companies. 

In addition to a price return index, a total return version is also calculated (DBCT).

The companies said the index provides complete transparency about screening methods, selection criteria, securities, and sector mapping.