INTERWEST PARTNERS
INTERWEST PARTNERS is a Seed, Series A and Series B fund in Texas, the US and west-coast writing $1M–$10M checks into Enterprise, Healthcare, it, software, computing, communications, semiconductors, consumer-internet, online-advertising, mobility, biopharmaceuticals, medical-devices, therapeutics, cardiology, oncology, immunology, infectious-diseases, ophthalmology, neurology, orthopedics, pain-management, neuromodulation, consumer-driven-healthcare, drug-device-convergence and personalized-medicine.
Not currently making new investments (as of August 17, 2026).
- Stages
- Seed, Series A, Series B
- Sectors
- Enterprise, Healthcare, it, software, computing, communications, semiconductors, consumer-internet, online-advertising, mobility, biopharmaceuticals, medical-devices, therapeutics, cardiology, oncology, immunology, infectious-diseases, ophthalmology, neurology, orthopedics, pain-management, neuromodulation, consumer-driven-healthcare, drug-device-convergence, personalized-medicine
- Check size
- $1M–$10M
- Invests in
- Texas, US-wide, west-coast
- Round role
- Leads rounds
- Actively investing
- No
- Founded
- 1979
- Assets under management
- $2.8B
- Website
- interwest.com
Thesis
InterWest Partners, founded in 1979 and headquartered in Los Altos, California, is a venture capital firm that historically focused on early-stage investments in the IT and healthcare sectors. Their IT focus included software, computing, communications, semiconductors, SaaS, consumer internet, online advertising, and mobility. In healthcare, they specialized in biopharmaceuticals, medical devices, and therapeutics, with interests in cardiology, oncology, immunology, infectious diseases, ophthalmology, neurology, and orthopedics, as well as pain management, neuromodulation, consumer-driven healthcare, drug-device convergence, and personalized medicine. The firm typically invested in seed and Series A/B rounds, with check sizes ranging from $1 million to $10 million, often acting as the lead investor. InterWest managed approximately $2.8 billion across ten funds, with their last fund closing in 2007. Their geographic scope was primarily North America, with a traditional focus on Texas and the West Coast. InterWest Partners is currently in a harvesting or wind-down phase and is not seeking new investments. They have a notable history of 32 IPOs and 144 acquisitions.
Common questions
Does INTERWEST PARTNERS invest at the Seed stage?
Yes. INTERWEST PARTNERS lists Seed, Series A and Series B among the stages it invests in.
What check size does INTERWEST PARTNERS write?
INTERWEST PARTNERS writes $1M–$10M checks.
Where does INTERWEST PARTNERS invest?
INTERWEST PARTNERS invests in Texas, the US and west-coast.