The Federal Maritime Commission (Commission) issues this supplemental notice of proposed rulemaking (SNPRM) to address a statutory requirement arising from the Ocean Shipping Reform Act of 2022 that prohibits ocean common carriers from unreasonably refusing to deal or negotiate with respect to vessel space accommodations and a related prohibition against unreasonably refusing cargo space accommodations. This proposal revises certain aspects of the proposed rule issued on September 21, 2022, by modifying defined terms and discussing the relationship between the United States Code and the elements required to establish violations of those provisions. This SNPRM is issued in response to comments to the original proposal and to more directly provide a potential standard for unreasonable conduct by ocean common carriers that prevents shippers from obtaining space aboard vessels for their cargo.