Applying HIB from Multiple Employers

Hello All,

Currently I am in F1 and working for company A. I got an oppurtunity from company B.

Both A and B are applying H1-B. Incase If both applications got approved when would be the deadline for me to chosse one?

Is it Immeadiatly after getting WAC numbers from both compoanys or i can wait until the H1B start date (October 1st)?

Thanks
Anjaney

If both approved, u must choose one at the time of stamping or COS