I was working with Company A on H1B until September 30, 2009. My company did not apply for H1B extension since they could not find a project for me. I have completed 3 years on my first H1B.

I applied for COS to F1 on September 23, 2009 and got the receipt from USCIS on Sep 28, 2009.

Now I got a job from Company B.

Question:

1. Can Company B file for H1B transfer? Can a gap of 12 days create a problem in the H1B transfer approval? My visa with Company A expired on September 30, 2009.

2. Does Company B need to file for COS from F1 to H1B?

3. When is the best time to withdraw the F1 COS application? What form does one need to submit?

Appreciate your inputs.