Why does the history for PowerShares QQQ Trust only extend to April 12, 2007?
PowerShares QQQ Trust is an exchange traded fund; there are some special considerations regarding its association with another ETF security, NASDAQ 100 Trust Series I.
- PowerShares QQQ Trust begins its history on April 12, 2007 and the NASDAQ 100 Trust Series ends its history the previous day, April 11, 2007.
- The final distribution recorded for the NASDAQ 100 Trust Series lists PowerShares QQQ as its acquirer.
- By CRSP's methodology, the security-level identifier, PERMNO, cannot be associated with multiple company-level identifiers, PERMCO. Thus, PowerShares QQQ cannot maintain the same security level identifier as the NASDAQ 100 Trust Series due to the securities having different PERMCO identifiers.
- To merge the return histories of both securities replace the initial null value for PowerShares QQQ Trust with the delisting return of the NASDAQ 100 Trust Series I.
Example:
