H1B transfer :: 4th year on H1B

[eske]

Scenario as follows:

I am on 4th year of H1B(expires in Sept 2016) and am working with Company A and have an approved I-140.
I want to move to company B , If I transfer my H1B with company B now, what will be my new H1B expiry date
i.e.
will i get it still till Sept 2016(same as above)

OR

will i get it till sept 2017(as my I - 140 is approved via company A already)

Regards,

Eske