Welsh, Carson, Anderson & Stowe (WCAS) has announced it has acquired a majority ownership stake in Leiters.

Leiters, based in Englewood, Colo., and founded in 1926, is a 503B outsourcing provider of hospital and ophthalmology compounded sterile preparations.

WCAS, based in New York, is a private equity firm focused exclusively on the healthcare and technology industries. Founded in 1979, the firm targets growth-oriented companies with an investment strategy that is deal-size agnostic.

WCAS acquired its equity position in Leiters from the company’s existing investor group. This includes Kaiser Permanente Ventures, Mayo Clinic, Frazier Healthcare Partners, SV Health Investors and H.I.G. BioHealth Partners.

Terms of the acquisition were not disclosed.