Inclusion Criteria:

* Males and females ≥18 years of age at the time of consent
* Written informed consent in accordance with federal, local, and institutional guidelines
* Have an ECOG performance status of 0 or 1
* Documented diagnosis of MM per IMWG diagnostic criteria
* Received at least three prior MM treatment lines of therapy
* Have received as part of their previous therapy a PI and IMiD and an antiCD38 antibody.
* Have documented evidence of progressive disease by the IMWG criteria.
* Subjects must have measurable disease at screening.
* Adequate bone marrow and organ function

Exclusion Criteria:

* Diagnosed or treated for invasive malignancy other than multiple myeloma, except:

* Malignancy treated with curative intent and with no known active disease present for ≥2 years before enrollment; or
* Adequately treated non-melanoma skin cancer without evidence of disease.
* The following cardiac conditions:

* New York Heart Association (NYHA) stage III or IV congestive heart failure
* Myocardial infarction or coronary artery bypass graft (CABG) ≤6 months prior to enrollment
* History of clinically significant ventricular arrhythmia or unexplained syncope, not believed to be vasovagal in nature or due to dehydration
* History of severe non-ischemic cardiomyopathy
* Received either of the following:

* An allogenic stem cell transplant within 6 months before apheresis. Subjects who received an allogeneic transplant must be off all immunosuppressive medications for 6 weeks without signs of graft-versus-host disease (GVHD).
* An autologous stem cell transplant ≤12 weeks before apheresis
* Known active, or prior history of central nervous system (CNS) involvement or exhibits clinical signs of meningeal involvement of multiple myeloma.
* Plasma cell leukemia at the time of screening (\>2.0×109 /L plasma cells by standard differential), Waldenström's macroglobulinemia, POEMS syndrome (polyneuropathy, organomegaly, endocrinopathy, monoclonal protein, and skin changes), or primary AL amyloidosis.

Note: Other protocol defined Inclusion/Exclusion Criteria may apply.

Eligibility last updated 5/29/2024. Questions regarding updates should be directed to the study team contact.