What is the Portability Rule?

i-485-application-to-register-permanent-residence-slash-adjust-status
What is the Portability Rule?
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For all those aliens who are beneficiaries (or applicants) of employer-sponsored I-140s, namely, EB-1(b) (Outstanding Researcher or Professor), EB-1(c), EB-2 (except NIW) and all EB-3, current immigration law allows them to change employers 180 days after the DATE OF FILING an I-485 adjustment of status. This has been called the portability rule.