The C-CoMP Bridge-to-PhD Fellowship program advances our goal of broadening participation in the ocean sciences by affording diverse cohorts of Fellows opportunities to explore their research interests, gain technical skills, and engage in interdisciplinary, collaborative research before they commit to a graduate program. The current cohorts of Fellows work in C-CoMP labs at Boston University, Columbia, the University of Georgia, UConn Health, and the Woods Hole Oceanographic Institution with C-CoMP principal investigators as mentors. They participate in C-CoMP working and project groups, attend national meetings, and engage in professional development activities to prepare for careers in the geosciences. These efforts further our mission to bring a diversity of expertise, experiences, and viewpoints to the promotion of a deeper understanding of the chemical and microbial processes that govern ocean ecosystems and build capacity in the geosciences workforce. The program design, theory of change, initial outcomes, and future directions will be presented.