TO:	ALL CLEARING PARTICIPANTS
FROM:	CLIENT SERVICES AND SUPPORT
DATE:	December 17, 2007
SUBJECT:	Margin Change for USFE futures

The following margin change will be effective at the close of business Monday, December 17, 2007.

Contract	From	To
ISE Homebuilders Index Future (UB)	$275	$150
ISE Natural Gas Index Future (UG)	$550	$600
ISE SINdex Future (UI)	$400	$475
ISE Water Index Future (UW)	$350	$425
Morningstar Large Cap Growth (UO)	$400	$425
Morningstar Large Cap Value (UM)	$750	$825
Morningstar Medium Cap Growth (UR)	$750	$775
Morningstar Small Cap Core (UV)	$1900	$2175
Morningstar Small Cap Growth (UX)	$575	$675
Morningstar Small Cap Value (UT)	$1100	$1200
Spot Equivalent Future AUD/USD (VA)	$1200	$1600
Spot Equivalent Future GBP/USD (VB)	$1100	$1900
Spot Equivalent Future EUR/USD (VE)	$725	$975
Spot Equivalent Future USD/CAD (VC)	CAD 850	CAD 1275
Spot Equivalent Future USD/CHF (VS)	CHF 750	CHF 850

Should you have any questions, please call or e-mail one of the following Client Services and Support Representatives: