Attorney share h1b information

I work for employer A and got an offer from employer B and working with the law firm appointment by them to to file my H1B transfer. Later I got an another offer form employer C which I feel better than employer B so before they file my H1B I informed employer B that I am not going to proceed with them and closed it out. Now employer C told me the law firm they use for immigration and it is the same law firm used by employer B. In this case even though I stopped my processing before filing my H1b with employer B will the law firm share that information to employer C that I worked in parallel with another employer? Is it common for the law firms to share such information or they keep it confidential to the client.

You are not the confidentiality key here but your companies are. Company C is protected from Company B via independent attorney - client privileges. As both companies are clients; all client data is protected and confidential including information on their workers. Attorney can attract debarment for violating this rule.

Thanks for you response. So there is no way attorney law firm will let know the other employer about my case with another employer. I was worried as the website portal is same. Thanks again.