NRMP administers the Main Residency Match® for residency programs accredited by the Accreditation Council for Graduate Medical Education (ACGME), but programs accredited by the American Osteopathic Association (AOA®) and some ACGME-accredited core specialties participate in national matching programs that conclude before the NRMP Main Residency Match. This information is for applicants who register for the Main Residency Match and another “early” national matching program. Applicants who obtain a position in an early Match must understand how that match may affect their participation in the Main Residency Match. Applicants may need to change their rank order list or withdraw from the Match. Failure to abide by these policies could result in a match to a concurrent-year position and lead to a violation investigation and the levying of sanctions.