Josh Stein

Founder and Managing Partner at Threshold Ventures | Early-stage VC partnering with visionary founders at the threshold of explosive growth

📍 Menlo Park, California, United States🔄 Updated September 2026💼 18 investments📅 21 years investing🗓 Last invested Jul 2025𝕏 @upgrade_to_unlock
VC🌍 United States
18
Total investments
7
Early stage
10
Mid stage
1
Late stage
21y
Years active

Portfolio

18 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Board Observer
Jul 2025
Spellbook is the most popular AI suite for commercial lawyers. It helps legal teams draft and review contracts 10x faster, with greater precision—right in Microsoft Word. More than 4,500 in-house teams and law firms trust Spellbook to scale contract review. Review: Ensure contracts are compliant to your standards, surfacing issues and suggesting redlines. Works right in Microsoft Word. Ask: Surface accurate answers with citations, from legal data sources as well as your own contract repository. Ask questions like: “Which employment agreements need to be updated this year based on changes in employment law?” Compare to Market: Spellbook is the only tool grounded in real market data. Compare your agreements to realtime data in your geography or industry. Intake: Enable your business teams to move quickly, while getting you the information you need, with Spellbook Greenlight. Multi-Document Drafting: Spellbook Associate is the first AI agent that can accomplish complex multi-document drafting work, like assembling a financing transaction from a term sheet. Organize: Automatically sort your historical contracts and extract key information from them. www.spellbook.com
Board Member
Jun 2020
Sanity is the intelligent content backend for companies building AI content operations at scale. Structured content that feeds models, powers agents, and runs workflows, not just websites. Used by Puma, Figma, Braze, Anthropic, and thousands of teams shipping content at scale. All-code Studio. Free to start.
Board Member
Dec 2019
Databook’s award-winning Strategic Relationship Management (SRM) platform uses advanced AI and NLP to empower the world’s largest B2B sales teams to create, manage, and maintain strategic relationships at scale. The platform ingests and interprets billions of financial and market data signals to generate actionable sales strategies that connect the seller’s solutions to a buyer’s financial pain and urgency. Find out more at www.databook.com
Board Member
Feb 2019
Sourceress is an AI recruiter that is reinventing how people find jobs. With tailor-made machine learning models, we rigorously define what a company is looking for in a role, identify great candidates, and engage candidates with highly personalized introductions. Our process creates a stream of interested candidates that hiring managers are excited about more than 85% of the time. Our mission is to accelerate human progress by helping people work in jobs that matter. We raised $3.5M from Y Combinator, Lightspeed Venture Partners and OpenAI researchers.
Board Observer
2017
Front is the modern customer service platform that helps companies delight their customers, engage their teams, and build stronger businesses. We’ve reimagined the help desk for real-time team collaboration across every customer communication channel, then powered it up with AI and automation to resolve issues and help teams work faster. Customers get exceptional service whether they’re looking for a simple, instant answer, or personalized help on their most complex issues — and you get the analytics and insights your business needs to optimize your customer experience. Over 8,500 businesses of all shapes and sizes, from ClickUp to Branch Insurance, Echo Global Logistics to Reed & Mackay rely on Front to deliver game-changing service that wins and retains customers for life.
Board Member
2017
Lumity partners with the modern employer and employee to drive a competitive benefits program that delivers a superior experience. Our data technology, expertise, and education is designed as an end-to-end solution for high growth companies seeking to competitively recruit, engage, and scale top talent. Our partnership approach to benefits powers the employer and employee experience at Lyft, Greenhouse, GoFundMe, Robinhood, Bird, and other fast-growing modern companies.
Board Observer
2017
Loftium (acquired by Flyhomes) is a fast growing Seattle-based technology startup that uses Airbnb to provide innovative new paths to affordable home ownership. Our Host to Own product lets you move into your dream home today, build savings for your down payment by hosting guests in a private suite, and buy the home within three years. We’re a nimble and capable team that’s fast-paced, experiment driven, diverse, and places a premium on learning, experimentation, and results. This is a fantastic opportunity to get in early and have a huge impact as we scale!
early stageReal Estate
Board Member
Nov 2016
LaunchDarkly isn’t just a leader in feature management — it’s the first scalable feature management platform. Feature management allows development teams to innovate faster by fundamentally transforming how software is delivered to customers. With the ability to gradually release new software features to any segment of users on any platform, DevOps teams can standardize safe releases at scale, accelerate their journey to the cloud and collaborate more effectively with business teams. Today, LaunchDarkly deploys peaks of 20 trillion feature flags each day, and that number continues to grow. Founded in 2014 in Oakland, California by Edith Harbaugh and John Kodumal, LaunchDarkly has been named on the Forbes Cloud 100 list, InfoWorld’s 2021 Technology of the Year list, and the Enterprise Tech 30 list.
Board Member
Jul 2015
The best of both worlds: we are now #Sisense! For info about the platform formerly known as Periscope Data, visit www.sisense.com. Follow us at @Sisense!
Board Observer
Apr 2014
Founded in 2010, Doximity is the leading digital platform for medical professionals. The company’s network members include over 80% of U.S. physicians across all specialties and practice areas. Doximity provides its verified clinical membership with digital tools built for medicine, enabling them to collaborate with colleagues, stay up to date with the latest medical news and research, manage their careers and conduct virtual patient visits. Doximity’s mission is to help doctors be more productive so they can provide better healthcare for their patients. Learn more: https://linktr.ee/doximity
Board Observer
May 2013
Todays leading companies trust Twilios Customer Engagement Platform (CEP) to build direct, personalized relationships with their customers everywhere in the world. Twilio enables companies to use communications and data to add intelligence and security to every step of the customer journey, from sales to marketing to growth, customer service and many more engagement use cases in a flexible, programmatic way. Across 180 countries, millions of developers and hundreds of thousands of businesses use Twilio to create magical experiences for their customers.
Investor
Feb 2013
AngelList builds the infrastructure where capital, creativity, and hard work come together to accelerate the rate of innovation. Our platform supports over $171B in assets on platform, over 25K funds and syndicates, and 72K active investors. AngelList is the de facto platform for investing in the next generation of great startups. AngelLists suite of products includes: 🚀 Venture Funds 🔭 Scout Funds ⚡ SPVs 🌐 http://meridian.angellist.com 🔑 http://USVC.com
Investor
Feb 2012
Microsoft acquired Yammer, a best-in-class Enterprise Social Network (ESN), in June 2012 to be included in their broader portfolio. Yammer is available with Office 365, and together they form the core of Microsoft’s vision for Enterprise Social: to enable companies to work like a network. By connecting individuals to a dynamic network of people and information, we help companies listen, adapt, and grow in new ways, enabling them to better understand their customers, respond faster together, and deliver innovative products and personalized experiences. For more information about the Yammer acquisition visit: https://news.microsoft.com/2012/06/25/microsoft-to-acquire-yammer/#q9vMSIMq8d4quauT.97
Investor
Sep 2011
RethinkDB is the first open-source scalable database for the realtime web. It exposes an exciting new access model -- instead of polling for changes, the developer can tell the database to continuously push updated query results to applications in realtime. RethinkDB allows developers to build scalable realtime apps in a fraction of the time with fewer engineering resources.
Board Observer
Mar 2010
We are very excited to share that the strategic pillars in the Tremor International brand portfolio - the combined Amobee and Tremor Video DSP, the Unruly SSP and the Spearad ad server - have rebranded as Nexxen!   Encompassing all elements of the Tremor International tech stack – which will now be known as the Nexxen DSP, Nexxen SSP and Nexxen Ad Server, with the SSP and ad server going to market collectively as Nexxen CTRL – this rebrand represents a new, unified chapter for us and a more seamless experience for our valued partners, so you can achieve more with the simplicity and efficiency of a single partner.   One platform. Endless possibilities.
Show all 18 investments ↓
Experience · 22 entries
All (22)
Investments (18)
Founder (1)
Board (15)
2025
Board Observer
Jul 2025
Spellbook is the most popular AI suite for commercial lawyers. It helps legal teams draft and review contracts 10x faster, with greater precision—right in Microsoft Word. More than 4,500 in-house teams and law firms trust Spellbook to scale contract review. Review: Ensure contracts are compliant to your standards, surfacing issues and suggesting redlines. Works right in Microsoft Word. Ask: Surface accurate answers with citations, from legal data sources as well as your own contract repository. Ask questions like: “Which employment agreements need to be updated this year based on changes in employment law?” Compare to Market: Spellbook is the only tool grounded in real market data. Compare your agreements to realtime data in your geography or industry. Intake: Enable your business teams to move quickly, while getting you the information you need, with Spellbook Greenlight. Multi-Document Drafting: Spellbook Associate is the first AI agent that can accomplish complex multi-document drafting work, like assembling a financing transaction from a term sheet. Organize: Automatically sort your historical contracts and extract key information from them. www.spellbook.com
2020
Board Member
Jun 2020
Sanity is the intelligent content backend for companies building AI content operations at scale. Structured content that feeds models, powers agents, and runs workflows, not just websites. Used by Puma, Figma, Braze, Anthropic, and thousands of teams shipping content at scale. All-code Studio. Free to start.
2019
Board Member
Dec 2019
Databook’s award-winning Strategic Relationship Management (SRM) platform uses advanced AI and NLP to empower the world’s largest B2B sales teams to create, manage, and maintain strategic relationships at scale. The platform ingests and interprets billions of financial and market data signals to generate actionable sales strategies that connect the seller’s solutions to a buyer’s financial pain and urgency. Find out more at www.databook.com
Board Member
Feb 2019
Sourceress is an AI recruiter that is reinventing how people find jobs. With tailor-made machine learning models, we rigorously define what a company is looking for in a role, identify great candidates, and engage candidates with highly personalized introductions. Our process creates a stream of interested candidates that hiring managers are excited about more than 85% of the time. Our mission is to accelerate human progress by helping people work in jobs that matter. We raised $3.5M from Y Combinator, Lightspeed Venture Partners and OpenAI researchers.
2017
Board Observer
2017
Front is the modern customer service platform that helps companies delight their customers, engage their teams, and build stronger businesses. We’ve reimagined the help desk for real-time team collaboration across every customer communication channel, then powered it up with AI and automation to resolve issues and help teams work faster. Customers get exceptional service whether they’re looking for a simple, instant answer, or personalized help on their most complex issues — and you get the analytics and insights your business needs to optimize your customer experience. Over 8,500 businesses of all shapes and sizes, from ClickUp to Branch Insurance, Echo Global Logistics to Reed & Mackay rely on Front to deliver game-changing service that wins and retains customers for life.
Show all 22 entries ↓
Investment activity
2005–2025 · 18 investments
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