Because the the new SHO rule changes demand that old short positions be covered by Sep 7th.
"DATES: Effective Date: September 7, 2004, except Part 241 will be effective August 6, 2004, and §242.202T will be effective from September 7, 2004 to September 7, 2007.
Compliance Date: The compliance date for §§242.200 and 203 is January 3, 2005. The compliance date for §242.202T is the same as its effective date, September 7, 2004."