›Portfolio Companies

Past, Present and Future Leaders

InterWest is proud and privileged to partner with visionary management teams who are shaping the future of Information Technology and Healthcare. The companies they have started are vital parts of the portfolio of industry-leading startups that InterWest has helped over the last four decades.

Our Companies

Early stage IT and Healthcare Investing




Fri, 06/15/2012 - 11:14 -- anonghost

Founded in July 2009, Alt12 apps is a software company committed to creating compelling and impactful mobile apps for women. It combines mobile, social and community features that bring women and families together and provides value every important stage of a woman's life. Based in San Francisco, Alt12 derives its name from the keyboard shortcut Alt-1-2, which produces the female symbol.


Fri, 06/15/2012 - 10:56 -- anonghost

Founded in 1987, Glycomed developed pharmaceuticals based on complex carbohydrates. After a successful IPO in 1991, the company was merged with Ligand Pharmaceuticals in a stock swap in 1995.

Quantum Health Resources

Fri, 06/15/2012 - 10:49 -- anonghost

Quantum established itself as a provider of mail order and in-the-home services and support to hemophiliacs and their families, then extended its business and service model to those afflicted by other chronic genetic disorders, such as cystic fibrosis, sickle cell anemia, Crohn's disease, and alpha-1 anti-trypain deficiency. Quantum was acquired by Olsten in 1996.

Presidium Holdings

Fri, 06/15/2012 - 10:48 -- anonghost

Presidium was a health care service company focused on the workers' compensation and disability marketplace. It offered a complete set of claims management and managed care services that allowed self-insured, mid-sized companies to manage their workers' comp and short-term disability claims cost effectively and with good outcomes. The company was acquired by Aon Services in 1999.

Paradigm Holdings

Fri, 06/15/2012 - 10:47 -- anonghost

Paradigm was the first specialty managed care company to provide comprehensive medical and risk management services on a turnkey basis, specializing in sophisticated case management of catastrophic workers' compensation cases, particularly those involving brain or spinal injuries. The company was acquired by Inverness Medical Innovations in 2007, and changed its name to Alere in 2010.

INC Research

Fri, 06/15/2012 - 10:46 -- anonghost

INC Research provides the full range of Phase I to IV clinical development services. With its global scale and scope and broad therapeutic expertise, the company produces actionable data, enabling medicine providers to assess the potential of their products quickly and cost effectively while freeing resources to think develop new products. The company was acquired by Avista Capital in 2010, but still operates under the INC name.

Health Management Associates

Fri, 06/15/2012 - 10:45 -- anonghost

Health Management Associates (HMA) partners local communities to provide outstanding health care services. HMA manages a portfolio of 60 hospitals in 15 states. HMA empowers its hospitals and physician partners with the resources and expertise they need to fulfill their local missions of delivering superior health care services.

American Transitional Hospitals

Fri, 06/15/2012 - 10:44 -- anonghost

InterWest invested in this company in 1993, when it refocused its business on a "hospital-within-hospital" model for providing subacute transitional health care services for long-term patients with a tailored mix of services to maximize outcome. ATH was acquired by Beverly in 1994.


Fri, 06/15/2012 - 10:19 -- anonghost

Ventritex established itself in the 1980s as a leading maker of implantable defibrillators, surgically implanted devices that automatically correct potentially lethal abnormal heart rhythms known as cardiac arrhythmias. Ventritex completed an IPO in 1993, and was acquired by St. Jude Medical in 1997.

Ventana Medical

Fri, 06/15/2012 - 10:12 -- anonghost

Ventana discovers, develops, and delivers medical diagnostic systems and biopsy-based cancer tests. As the leading supplier of cancer diagnostic systems to the pathology market, Ventana manufactures over 200 cancer tests for the four million people afflicted with cancer annually. Ventana completed an IPO in 1995 and was acquired by The Roche Group in 2008. The company still operates under the Ventana name.


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