Can H1B visa holders change jobs while their Green Card application is pending, and what is the process for transferring sponsorship?

Once your Form I-485 has been pending for 180 days, you can “port” the offer of employment in the Form I-140 approval to a new job offer (same or different employer) as long as the new job offer is in a “same or similar” occupational classification when compared to the job offer in the Form I-140 petition