InterWest Partners
Menlo Park, California, United StatesFounded 1979
InterWest Partners is a venture capital firm founded in 1979 and based in Menlo Park, California. For over four decades it has invested in early-stage IT and healthcare start-ups, raising more than $2.8 billion across ten funds. The firm is currently in a wind-down phase and is not seeking new investments.
Average disclosed round size is $26.7M (across 67 rounds with reported amounts).
Portfolio
51
Fund Size
$650M
Top Stage
Series B
Last 12 Mo
0
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
70 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 GoCheck Kids | Unknown | $10M | Oct 2021 |
| GoCheck Kids | Unknown | $10M | Jan 2021 |
 Sera Prognostics | Series D | $36M | Nov 2019 |
 Aryaka | Series F | $16M | Jan 2019 |
| Sera Prognostics | Series D | $36M | Jan 2019 |
| AAryaka Networks | Series F | $50M | Jan 2019 |
 Centrexion Therapeutics | Series D | $67M | Jan 2018 |
 PMV Pharma | Series B | $74M | Feb 2017 |
 Spredfast | Series F | — | Jun 2016 |
 Tizona Therapeutics, Inc | Series B | $43M | Mar 2016 |
| Tizona Therapeutics, Inc | Series B | $43M | Jan 2016 |
| Aryaka | Series E | $16M | Mar 2015 |
| PMV Pharma | Series A | $30M | Jan 2014 |
| Aryaka | Series D | $10M | Jan 2014 |
| IIntegrated Diagnostics, Inc. | Series B | $30.3M | Jan 2014 |
 Achates Power | Series C | $35.2M | Oct 2013 |
 Canva | Seed | $3M | Aug 2013 |
| Spredfast | Unknown | $18M | Jan 2013 |
| PPelican Imaging | Series C | $20M | Jan 2013 |
| IInvuity | Series D | $25M | Jun 2012 |
 Xirrus | Series E | $23.5M | Jan 2012 |
| Aryaka | Series C | $25M | Jan 2012 |
| PPivot3 | Series D | $29M | Jan 2012 |
 CarWoo | Unknown | $6M | Dec 2011 |
| BBloomspot | Series B | $35M | Sep 2011 |
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Top Co-Investors
Domain Associates16 shared
Canaan Partners7 shared
OrbiMed6 shared
The Goldman Sachs Group, Inc.6 shared
MPM Capital5 shared
Presidio Ventures5 shared
Health Catalyst Capital5 shared
Osage University Partners5 shared
Alta Partners4 shared
Trinity Ventures4 shared
Mohr Davidow Ventures4 shared
Nexus Venture Partners4 shared
Frazier Healthcare Partners4 shared
NGP Capital4 shared
Versant Ventures4 shared
Lead Edge Capital3 shared
Globespan Capital Partners3 shared
Qualcomm Ventures3 shared
Mucker Capital3 shared
Bay Partners3 shared
Last updated: 8 September 2026