Innovation rarely comes from established experts, but rather from those who ask better questions. Keith Rabois on why curiosity beats credentials: “People are like, ‘Where do you get your contrarian ideas?’ I was like, 'I read books.' All the greatest thinking of all time is available to anybody. You just have to read.”
Andreessen Horowitz
Venture Capital and Private Equity Principals
Menlo Park, CA 585,847 followers
It's Time to Build.
About us
Founded in 2009 by Marc Andreessen and Ben Horowitz, Andreessen Horowitz (known as "a16z") is a venture capital firm that backs bold entrepreneurs building the future through technology. We are stage agnostic: We invest in seed to late-stage technology companies, across the consumer, enterprise, bio/healthcare, crypto, fintech and games spaces. a16z is defined by respect for the entrepreneur and the entrepreneurial company building process; we know what it’s like to be in the founder’s shoes. The firm is led by general partners, many of whom are former founders/operators, CEOs, or CTOs of successful technology companies, and who have domain expertise ranging from biology to crypto to distributed systems to security to marketplaces to financial services. We aim to connect entrepreneurs, investors, executives, engineers, academics, industry experts, and others in the technology ecosystem. We have built a network of experts including technical and executive talent; top media and marketing resources; Fortune 500/Global 2000 companies; as well as other technology decision makers, influencers, and key opinion leaders. a16z uses this network as part of our commitment to help our portfolio companies grow their business, so our operating teams provide entrepreneurs with access to expertise and insights across the entire spectrum of company building. https://a16z.com/portfolio/ https://a16z.com/podcasts/ https://a16z.com/videos/ http://a16z.com/subscribe See Disclosures: https://a16z.com/disclosures/
- Website
-
http://www.a16z.com
External link for Andreessen Horowitz
- Industry
- Venture Capital and Private Equity Principals
- Company size
- 201-500 employees
- Headquarters
- Menlo Park, CA
- Type
- Privately Held
- Founded
- 2009
Locations
-
Primary
2865 Sand Hill Road
Menlo Park, CA 94025, US
Employees at Andreessen Horowitz
Updates
-
Andreessen Horowitz reposted this
What if you had the world's best doctor by your side for life? A doctor who is always available, extremely knowledgeable, and completely personalized to you. Right now, our healthcare system looks nothing like that vision. Today, over 100 million people in the U.S. don’t have a dedicated doctor, and even those who do often wait weeks to see them. Our healthcare system is designed to ration access to our scarcest resource – doctor time. And in a world where clinician capacity is scarce, people are forced to turn to Google or ChatGPT for answers. Consumers ultimately need clinical resolution: the prescription, the lab test, the specialist appointment, the follow-up, the ongoing guidance and encouragement to change their lifestyle. So what would healthcare abundance look like in the age of AI? It would look like Counsel Health. Counsel is a full-stack, AI native medical group that makes medical care abundant – unlimited guidance from real doctors, scaled by Counsel’s medical AI. This system embodies several qualities that everyone should expect from AI as a new site of care, which go far beyond the simplistic, early models of digital health that simply replicated offline visits on a computer screen: 1. Always available (and actionable): Care when you need it, not weeks later. By making doctors the true front door to care, Counsel prevents the typical swirl that occurs when we gate access to physicians. 2. Extremely knowledgeable: Medical knowledge doubles every few months. No human can keep up. Counsel’s AI spans the entire corpus of medical knowledge, across every discipline, and brings it straight to the point of care. 3. Completely personalized: Counsel’s AI remembers – it maintains context across every interaction, building a data flywheel for more personalization over time. As clinicians validate and reinforce the AI recommendations, Counsel steadily makes more of its interactions autonomous. Counsel is led by Muthu Alagappan, MD, who has lived at the intersection of AI, medicine, and healthtech for more than a decade. Previously a Stanford-trained physician, AI researcher, and chief medical officer at a high-growth healthtech company, he combines deep clinical expertise with a builder’s intuition for how to redesign care models in the age of AI. We led Counsel’s seed financing last year because of our conviction in this bold idea: that we can build a world in which everyone has their own doctor for life. In the months since, the company has made immense progress toward that future. That’s why we’re thrilled to double down on Counsel Health and co-lead their Series A, along with our friends at GV (Google Ventures). Counsel is redefining what it means to access healthcare: no longer scarce, but abundant. Andreessen Horowitz a16z Bio + Health Julie Yoo Sherman L. Rajko Radovanović Krishna Yeshwant David Reshef Asymmetric Rob Biederman Nancy Chou Floodgate Ann Miura-Ko Pear VC Mar Hershenson
-
We’re excited to be doubling down and co-leading Counsel Health's Series A after leading their Seed round last year. Everyone should have their own doctor for life. But today’s healthcare system is defined by scarce clinical capacity. Over 100 million people in the U.S. don’t have a dedicated doctor, and even those who do often wait weeks to see them. Counsel sees a better way: they’re building an always available, extremely knowledgeable, completely personalized medical AI, closely paired with expert human physicians that can join any conversation within minutes Led by Muthu Alagappan, MD, previously a Stanford-trained physician, AI researcher, and healthtech executive, Counsel has made immense progress building healthcare abundance for the AI era. We’re thrilled to continue backing them on their path to the “perfect doctor.”
-
Andreessen Horowitz reposted this
Exactly two years ago today, Counsel Health was born from the simple realization that the world needs many more clinicians, and that safe, clinical AI could be the answer. Since then, we’ve cared for thousands of patients through leading enterprise partnerships, and we’ve strengthened our conviction that physician-supervised AI care models are the future of medicine. Fortunately, we’re not alone in this belief. Today, I’m proud to share that we’ve raised an oversubscribed $25M Series A, co-led by Andreessen Horowitz, and GV (Google Ventures), with participation from all existing investors (Asymmetric, Floodgate, Pear VC). This milestone is special for many reasons. First, we’re honored to have a16z’s continued support, just nine months after they led our Seed round. Over the past year, I’ve had the chance to work closely with Julie Yoo and Jay Rughani, and I’ve been struck by their intelligence, rigor, and tireless commitment to their founders, characteristics which have helped cement their reputation as amongst the best healthcare investors. We’re equally thrilled to welcome GV, specifically Krishna Yeshwant (co-lead of their Life Sciences practice) and David Reshef. The GV team represents some of the most thoughtful investors I’ve ever met — many are actively practicing physicians and PhD-level computer scientists — a combination that feels especially aligned to the Counsel ethos. This milestone also validates the importance we place on responsible AI development. Across the world, there’s a rising unease about what AI means for the future of work, truth, and human relevance. From day one, we’ve believed that clinical AI must be developed by physicians, not apart from them. That our mission can only be achieved by combining artificial and human intelligence, not by choosing between them. In fact, the cursive nature of Counsel's new brandmark pays homage to the physician signatures of the pre-internet era, a reminder that the human touch in medicine must never slip away. Alongside the fundraise, we’re also excited to announce that starting today, Counsel is available to the general public — you can sign up for your own account. Our leading medical AI is completely free to use, and you can add a real Counsel physician into any conversation within minutes, with a single click. We hope you’ll trust Counsel to become your home for health records, medical questions, and ongoing care. Finally, a heartfelt thank you to our enterprise partners and our mission-driven team. We are only at the beginning of what we can accomplish together.
-
Most BD deals fail for one reason: there’s nothing to trade. The other side already has distribution, capital, and brand. What can you give them that they don’t? Databricks CEO Ali Ghodsi explains that Databricks had the missing piece in Microsoft’s portfolio: and that “giving gap” made all the difference.
-
AI agents are learning to work autonomously for longer. Nathan Labenz, founder and former CEO of Waymark, thinks this means organizations will soon be able to do more with less, and increase their productivity by leveraging AI agents: “It’s a lot less than it would cost to hire a human to do it. And it's all on demand—immediately available. If I'm not using it, I'm not paying anything. Transaction costs are a lot lower.” Currently, AI agents can now run 2 hour tasks end-to-end. Evals suggest these capabilities may increase to 2 day tasks next year, and 2 week tasks within 2 years.
-
Ben Horowitz: “Culture is not a set of beliefs. It’s a set of actions.” Most companies define culture as values like “integrity” or “teamwork.” But those words don’t mean much until they cost you something. The real test of culture is what people do under stress, not what they say in the all-hands. You don’t define it once a quarter. You live it every day.
-
We are excited to be leading Reducto's $75M Series B. Despite the remarkable progress we’ve seen in AI over the last few years, document processing remains a critical bottleneck. Reducto exists to fix this. Unlike traditional optical character recognition (OCR) methods which are slow and error-prone, Reducto interprets documents highly accurately, reading layout, format, and structure as cues to meaning. Reducto provides granular control: it can extract only handwritten portions, summarize specific tables, or parse complex multilingual technical documents. Reducto handles it all. Reducto has processed over a billion pages for world-class teams at leading startups and some of the world’s largest institutions in tech, healthcare, and finance. We look forward to what Adit Abraham and Raunak Chowdhuri will accomplish.
-
Andreessen Horowitz reposted this
Excited to announce that Reducto has raised a $75M Series B led by Andreessen Horowitz, bringing our total funding to $108M. Less than two years ago, we released the first Parse API to blend traditional OCR with frontier VLM capabilities, and set a new standard for converting complex documents into LLM-ready data. We’ve pushed that frontier ever since alongside the best teams in AI as they build everything from document workflows to agentic applications that can read, edit, and act on unstructured data. Today, Reducto powers companies of all sizes — from leading startups like Harvey, Mercor, and Rogo to some of the world’s largest financial institutions, tech companies, and healthcare organizations. Reducto has now processed more than a *billion* pages for these incredible teams, and that number is continuing to accelerate each month. Our monthly processing volume has increased 6x since we announced our Series A just a few months ago. But we’re just getting started. Real-world impact from AI means working with messy, real-world data, and we have a lot of work ahead of us as we build the interface that unlocks that context. With this round we’ll be accelerating our work across model research and product capabilities. In the near term we’ll be announcing a series of product improvements that extend our capabilities even further to help our customers achieve near-perfect accuracy on their most challenging data. Just as importantly, we want to make Reducto available for everyone. Starting today we’re introducing a new flexible pricing structure, including a generous credit program for startups and researchers, for the next generation teams that want access to the same best-in-class infrastructure used by leading enterprises. I’m incredibly excited to partner with the a16z team and to welcome Jennifer Li to our board. I first met with Jennifer shortly after our seed round, and couldn’t imagine a better partner to add to our team for this next chapter. I’m also very excited to have our existing investors Benchmark, First Round Capital, BoxGroup, and Y Combinator double down in this round, and for all of their support in getting us to this point. Most of all, Raunak and I wanted to thank everyone that has helped get Reducto to where it is today. That includes friends and family, our investors, the entire team, and most importantly all of the customers that have trusted us along the journey. We said from day one we wanted to be their ingestion team, and everything we build is shaped by working alongside you. We can’t wait for everything that’s ahead. If you’re excited about defining how the world processes unstructured data, we’re hiring across engineering, sales, and more, and would love to have you join us. Our careers page and more information about the round is linked in the comments. More from us soon!
-
In 2014, most landmark AI systems were born in academia. By 2024, they’re being built inside companies, or by teams that combine research depth with production muscle. It’s a structural shift in how innovation happens. Ideas still matter, but execution now depends on access to compute and data at industrial scale. The story of AI’s rise is also the story of infrastructure catching up to imagination. Source: Epoch AI (2025) via Our World in Data
-