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InterWest Partners

Investor type Venture Capital


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Total investments 434
Average round size
The average size of a deal this fund participated in
Portfolio companies 200
Rounds per year 9.86
Lead investments 65
Follow on index
How often the fund supports its portfolio startups at next rounds
Exits 111
Key employees 8
Stages of investment
Early Stage Venture
Late Stage Venture

Areas of investment

  • Health Care
  • Biotechnology
  • Software
  • Medical
  • Medical Device

InterWest Partners is the famous VC, which was founded in 1979. The main department of described VC is located in the Menlo Park. The venture was found in North America in United States.

The overall number of key employees were 8.

The standard case for the fund is to invest in rounds with 4-5 partakers. Despite the InterWest Partners, startups are often financed by U.S. Venture Partners (USVP), Trinity Ventures, Storm Ventures. The meaningful sponsors for the fund in investment in the same round are Vivo Capital, Trinity Ventures, Skyline Ventures. In the next rounds fund is usually obtained by Mesirow Financial, Mayfield Fund, Investor Growth Capital Limited.

This InterWest Partners works on 5 percentage points less the average amount of lead investments comparing to the other organizations. The important activity for fund was in 2013. Despite it in 2019 the fund had an activity. When the investment is from InterWest Partners the average startup value is 50-100 millions dollars. The fund is constantly included in 13-24 deals per year. The top amount of exits for fund were in 2014. Considering the real fund results, this VC is 3 percentage points more often commits exit comparing to other organizations. The usual things for fund are deals in the range of 10 - 50 millions dollars.

The fund has no exact preference in a number of founders of portfolio startups. When startup sums 5+ of the founder, the probability for it to get the investment is little. Among the most successful fund investment fields, there are Health Care, Biotechnology. Moreover, a startup needs to be at the age of 4-5 years to get the investment from the fund. Among the various public portfolio startups of the fund, we may underline Intarcia Therapeutics, TESARO, Marketo For fund there is a match between the location of its establishment and the land of its numerous investments - United States.

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Related Funds

Funds investing in previous rounds
These funds often invest in the rounds preceeding the rounds of InterWest Partners:
Typical Co-investors
InterWest Partners is more likely to invest in rounds together with the following funds:
Funds investing in following rounds
These funds have a tendency to invest in the following rounds after InterWest Partners:

Funds with similar focus

Funds from United States
Funds with similar focus located in United States:
Funds with the same geo focus
Funds with similar geography of portfolio companies:
Funds doing lead investments
Funds with similar focus acting as lead investors:

Notable deals

CompanyIndustryRound SizeDateInvestorsLocation


Health Care
Medical Device
Mobile Apps
$10M19 Oct 2021 Nashville, Tennessee, United States

PMV Pharmaceuticals

Health Care
Medical Device
$62M13 Nov 2019 Redwood City, California, United States

Welcome Software

Content Marketing
Digital Marketing
$20M11 Jul 2019 New York, New York, United States

Aryaka Networks

Cloud Computing
Enterprise Software
$50M01 May 2019 San Mateo, California, United States


Health Care
Medical Device
Mobile Apps
$6M25 Apr 2019 Nashville, Tennessee, United States

Splice Machine

Big Data
Information Technology
$500K18 Jan 2019 San Francisco, California, United States

Aria Systems

Cloud Computing
Enterprise Software
Subscription Service
$30M11 Dec 2018 San Francisco, California, United States

The RealReal

$115M25 Jul 2018 San Francisco, California, United States


Health Care
Medical Device
$25M02 May 2018 Massachusetts, United States


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