SAN DIEGO, Sept. 22, 2026 /PRNewswire/ -- Primrose Bio, Inc. ("Primrose"), a provider of production solutions for next-generation biologics, today announced the closing of a financing round led by new investor Signet Healthcare Partners ("Signet"), with significant participation from existing investors 1315 Capital, Ligand Pharmaceuticals Incorporated (Nasdaq: LGND), LDV Partners, and Agent Capital.

