This is a post-trial access (PTA) open-label, single-arm study in Multiple Myeloma participants who continue to derive clinical benefit from elranatamab monotherapy in the Pfizer-sponsored elranatamab Parent Studies.

This is a single-arm elranatamab post-trial access study. Participants will receive elranatamab. All participants will receive elranatamab until disease progression, unacceptable toxicity, withdrawal of consent, study termination or, elranatamab becomes commercially accessible in the participant's country.

Inclusion Criteria:

• Participants must agree to follow the reproductive criteria as outlined in the protocol
• Participants have completed a qualifying Parent Study, were still receiving elranatamab when the Parent Study terminated or completed, and are deriving clinical benefit from elranatamab (as determined by the investigator).

Exclusion Criteria:

• Any medical or psychiatric condition including recent (within the past year) or active suicidal ideation/behavior or laboratory abnormality that may increase the risk of study participation or, in the investigator's judgment, make the participant inappropriate for the study.
• Participants not previously enrolled or who have discontinued study treatment in a Parent Study are ineligible for participation in this study.

Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical\_trials/trial\_data\_and\_results/data\_requests.