InterWest Partners
VC Fund
Menlo Park, United States
InterWest Partners is a VC fund in Menlo Park focused on Health Care and Biotechnology. InterWest invests an average of about $7 - 15 million over the span of their involvement with each company in their portfolio. They invest in companies through the full range of venture investment stages, and investments may be staged over several rounds of financing. Although they generally begin their involvement in the early stages of a company's development, they pursue attractive opportunities based on their individual merits rather than their investment stage.
- Total investments:
- 325
- Last investment:
- Lead investor:
- 23%
- Fund size:
- $650M
- Last fund:
Last updated:
For AI agents: llms.txt
Industries InterWest Partners invests in
Stages InterWest Partners invests in
Countries InterWest Partners invests in
Round sizes
Contacts
| Name | Phone | Socials | |
|---|---|---|---|
| See all 9 contacts → | |||
Round size
- Series A
- $4.5M–$30M
- Series B
- $7M–$38M
- Series C
- $6.1M–$48M
Investment Focus
Industry
- Health Care 53 (16%)
- Biotechnology 44 (14%)
- Software 36 (11%)
- Medical 29 (9%)
- Medical Device 22 (7%)
Stage
- Series B 53 (16%)
- Series A 47 (14%)
- Series C 44 (14%)
- Series D 38 (12%)
- Funding Round 28 (9%)
Country
- United States 151 (46%)
- Canada 2 (1%)
- China 1 (0%)
- France 1 (0%)
- Australia 1 (0%)
Team
| Name | Title | Investments | Links | |
|---|---|---|---|---|
Doug Fisher
Executive in Residence & Partner
|
Executive in Residence & Partner | Total investments: 13 | Find email | |
Arnie Oronsky
Managing Director
|
Managing Director | Total investments: 12 | Find email | |
Charline Gauthier
Executive-in-Residence
|
Executive-in-Residence | Total investments: 0 | Find email | |
Karen Wilson
CFO
|
CFO | Total investments: 0 | Find email | |
Katie Passalacqua
Controller
|
Controller | Total investments: 0 | Find email | |
| See all 9 team members → | ||||
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| GoCheck, creator of GoCheck Kids, provides mobile applications for the early detection and tracking of eye diseases. GoCheck Kids is solving this by bringing photo screening and visual acuity to a smartphone.GoCheck Kids serves over 6,500 pediatric teams in the U.S. and Europe in their quest to prevent vision impairment, the most prevalentdisabling condition among children in the U.S. and many countries. Vision diseases usually lead to compromised learning, blindness, and even death. They made early screening affordable, reducing the cost by over 60% by leveraging the iPhone’s manufacturing scale. It’s FDA-registered and CE certified. The company was incorporated in 2015. | $10M / Venture - Series Unknown / Oct 19, 2021 | ||
| PMV Pharma is developing first-in-class p53 and p53 pathway modulators for the treatment of cancer. Bringing together leaders in the field to utilize over three decades of p53 biology, PMV Pharma combines unique biological understanding with pharmaceutical development focus. | $62M / Series C / Nov 13, 2019 | ||
| Sera is a women’s health diagnostics company dedicated to improving the lives of women and babies through precision pregnancy care. Sera provides pivotal information during pregnancy to physicians, designed to help improve the health of their patients, and to reduce the costs of healthcare delivery. Sera has a robust pipeline of innovativediagnostic tests focused on the prediction of preterm birth risk and other complications of pregnancy. Sera’s PreTRM® Test reports to a physician the individualized risk of spontaneous premature delivery in a pregnancy, enabling earlier proactive interventions in women with higher risk. | $36M / Series D / Nov 13, 2019 | ||
| Welcome, a NewsCred brand, transforms how marketers run marketing. It is the leading marketing orchestration platform used by the world’s most ambitious brands to strategically align teams, take the friction out of execution, and demonstrate meaningful results. Only Welcome offers a platform purpose-built for the complexities of modern marketingthat can scale to support the largest teams in the world. It is a new layer of the marketing technology stack where marketers can work better together, connect other martech tools, and measure performance. Welcome unleashes the potential of marketing. Learn why the world’s leading brands have made Welcome their home for marketing. Visit welcomesoftware.com. | $20M / Venture - Series Unknown / Jul 11, 2019 | ||
| Aryaka is a Cloud-First WAN company that offers the industry’s managed SD-WAN delivered as a service. Its SmartServices offer connectivity, application acceleration, security, cloud networking, and insights leveraging global orchestration and provisioning. The company was founded in 2009 and is headquartered in San Mateo, California. | $50M / Series F / May 01, 2019 | ||
| GoCheck, creator of GoCheck Kids, provides mobile applications for the early detection and tracking of eye diseases. GoCheck Kids is solving this by bringing photo screening and visual acuity to a smartphone.GoCheck Kids serves over 6,500 pediatric teams in the U.S. and Europe in their quest to prevent vision impairment, the most prevalentdisabling condition among children in the U.S. and many countries. Vision diseases usually lead to compromised learning, blindness, and even death. They made early screening affordable, reducing the cost by over 60% by leveraging the iPhone’s manufacturing scale. It’s FDA-registered and CE certified. The company was incorporated in 2015. | $6M / Series B / Apr 25, 2019 | ||
| Splice Machine is a data platform that offers offline, and batch analysis, and powers intelligent applications for operational workflows.Splice Machine is disrupting the $30 billion traditional database world with the open-source dual-engine RDBMS for mixed operational and analytical workloads, powered by Apache Hadoop and Apache Spark. TheSplice Machine RDBMS executes operational workloads on Apache HBase® and analytical workloads on Apache Spark.Splice Machine makes it easy to develop and create modern, real-time, scalable applications, or to offload operational and analytical workloads from expensive Oracle, Teradata, and Netezza systems. Typical use cases are ETL, operational reporting, or real-time applications. | $500K / Venture - Series Unknown / Jan 18, 2019 | ||
| Aria helps enterprises grow recurring revenue businesses with an agile billing system. The company helps clients to take advantage of each customer-driven event − known as revenue moments − with agile billing, active customer engagement, and the rapid development of new products and services. With Aria's end-to-end active monetizationplatform, global brands can get to market faster with a wider variety of products and services, while maximizing customer satisfaction, retention, and lifetime value. | $30M / Private Equity / Dec 11, 2018 | ||
| The RealReal is the world’s largest online marketplace for authenticated, resale luxury goods, with more than 24 million members. With a rigorous authentication process overseen by experts, The RealReal provides a safe and reliable platform for consumers to buy and sell their luxury items. We have hundreds of in-house gemologists, horologists andbrand authenticators who inspect thousands of items each day. As a sustainable company, we give new life to pieces by thousands of brands across numerous categories—including women's and men's fashion, fine jewelry and watches, art and home—in support of the circular economy. We make selling effortless with free virtual appointments, in-home pickup, drop-off and direct shipping. We do all of the work for consignors, including authenticating, using AI and machine learning to determine optimal pricing, photographing and listing their items, as well as handling shipping and customer service. At our 18 retail locations, including our 15 shoppable stores, customers can sell, meet with our experts and receive free valuations. | $115M / Series G / Jul 25, 2018 | ||
| Bolt is on a mission to democratize commerce. Bolt strengthens retailers’ relationships with their customers by unlocking secure, logged-in, lightning-fast checkouts. The company’s rapidly growing network of one-click-checkout-ready shoppers visits Bolt merchants as if they are return customers. Hundreds of retailers including, REVOLVE, Casper,Badgley Mischka, and LVMH brand Benefit Cosmetics leverage Bolt to offer their shoppers the seamless checkout experiences they’ve come to expect across the internet.Bolt was established in 2014 and is headquartered in San Francisco, California. | $22M / Series A / Jun 01, 2018 | ||
| See all 325 investments → | |||
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FAQ
What does InterWest Partners invest in?
InterWest Partners invests primarily in Health Care, Biotechnology and Software startups, most often at Series B and Series A stage. Most of the 325 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What round sizes does InterWest Partners invest in?
InterWest Partners typically joins rounds of $4.5M–$30M at Series A, $7M–$38M at Series B and $6.1M–$48M at Series C. These are whole funding-round sizes, not InterWest Partners's own check, which is rarely disclosed: the 10th–90th percentile of the confirmed public funding rounds InterWest Partners took part in.
How do I contact InterWest Partners?
Public channels for InterWest Partners include LinkedIn, X (Twitter) and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
Who are the partners at InterWest Partners?
The team at InterWest Partners includes Doug Fisher (Executive in Residence & Partner), Arnie Oronsky (Managing Director) and Charline Gauthier (Executive-in-Residence), among 9 team members tracked by Shizune. The Team section lists each member with their title, investment count and links.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Oct 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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