H1b Visa Stamp required for New Company?

[sgpatel]

Hi Guys

i have transfered my h1b to new employer,and i have stamp in my
passport for old company until 2009.
Now i have an approval of h1b for new employer(Company).
if i want to go india and want to apply H4 for my wife
"Do i need to get Visa Stamp for new employer(Company)".

Please direct me about this problem ,i really need this information.

Thanks
SgPatel