Planning to Transfer H1-B, Do I need to apply for Extension Again ?

Hi,

I am planning to transfer H1 B to Comp B, if Comp B will get the petition approved for 2 years where as my visa is expiring next year.

in that case:

My VISA date on Passport will be the max I can stay in us or Can I consider the new petition date(Approved) as an Extension(during transfer).

The new petition end date will be your new max date.

You will also get a new I94 card attached to I797 form which would have the new start and end dates for you, You can stay upto the end date of the new I94.

Your legal stay is based on the new I-94 from the new H1B, you will need a visa to Travel. IF your visa is valid, you dont have to stamp again.