回複：H-1B Transfer-do I need to resign now?

No, you do not need to resign for the processing of H1-B transfer. After receiving the receipt of H-1 Tranfer, you are allowed to jump to new employer right away by using H-1B portability provision in AC21 law. If you like, you can choose to stay with your old employer until your H1-B transfer is approved. In addition, different company has different policy, some company requires an advace notice before leaving.