Changes to Regulation SHO Threshold Security List (Trade Date - 04-24-07)

Additions:
AMPE
AMTC
AVRX
CRLI
FDMLQ
GNLAF
HACBY
MSII
NAYNE
SCLL
SOLF
USEG
XETA
Subtractions:
AANIE
ASTT
ATCTW
CERTF
IPII
MDWV
MNTA
MWIS
PEFF
RAQPW
REFR
RVXCF
STNL
TLHO
TNXI
VAPH
WITM
YTEC