Stemmatters is a Portuguese biotechnology organization operating as a Contract Development and Manufacturing Organization (CDMO) specialized in regenerative medicine. The company provides integrated services covering process development, manufacturing in compliance with Good Manufacturing Practice (cGMP) standards, analytics, formulation, and the production of advanced cell-based therapies, blood-derived biological products, and innovative raw materials.

Founded as an academic spin-off in Guimarães, Stemmatters combines scientific research with manufacturing capabilities and clinical batch release, supporting clients in translating innovative therapies from early stages through to regulatory and commercial production. The company has also developed technological platforms, such as mimsys®, to support advanced therapy formulations and has been gaining international recognition through awards and partnerships within the biotechnology sector.