Transfering h1b to mutiple employers

Question

I am currently working for Company1 on H1B. I have an offer from Company2 and interviewed by Company3. But Company3 will take a couple of weeks to let me know the result. If I get an offer from Company 3, I would join it immediately. But can't risk losing 2 over 3

1. Can I initiate H1B transfer with Company 2 now and if I receive an offer from Company 3. is it risky

2. Can I ask Company 2 to stop my H1B transfer in middle citing reason that I am going for a different employer? Is it going to cause me any trouble with Company 2?

3.Should i inform them about my ongoing H1B transfer with Company 2

4. how soon can i join them

Answer 1

These kinds of fact specific questions need to be answered by the employer's attorney.