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Andreessen Horowitz
Venture Capital and Private Equity Principals
Menlo Park, CA 681,943 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/
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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
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Primary
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2865 Sand Hill Road
Menlo Park, CA 94025, US
Employees at Andreessen Horowitz
Updates
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Andreessen Horowitz reposted this
Today is a big day for Socket. We just raised a $60M Series C at a $1B valuation, led by Thrive Capital with participation from Andreessen Horowitz, Abstract, and Capital One Ventures. Total funding is now $125M. Four years ago, we started Socket because open source dependencies were flowing into production faster than anyone could vet them. AI has massively accelerated that. Code is being written, shipped, and deployed before any human reads it. Security has to operate at that same speed. One data point from Thrive's diligence that I keep coming back to: they first discovered Socket because Cursor, OpenAI, and Anthropic all independently told them it was the most important security tool they'd adopted for AI-driven development. Three of the most sophisticated AI companies converging on the same vendor unprompted. Since our Series B, Socket has grown to more than 20,000 organizations, protecting over 1.5 million repositories and blocking more than 1,000 supply chain attacks every week. The team is now over 100 people. Three out of five FAANG companies are Socket customers. So are the companies building the most ambitious AI products: Anthropic, Cursor, xAI, Figma, Vercel, Replit, Scale AI, Gusto, Mercado Libre, and Cribl, alongside Fortune 100s in financial services and global media. What we've shipped since the last round: • Socket Firewall blocks malicious packages at install time, before they reach a developer's laptop or CI pipeline. Free for everyone. • Reachability analysis via our acquisition of Coana (acquired by Socket), eliminating 50-80% of irrelevant vulnerability alerts by focusing only on CVEs that are actually exploitable. • Socket Certified Patches for remediating exploitable CVEs in seconds without waiting on upstream maintainers. • Coverage extending to browser extensions, editor extensions, MCP servers, and AI tools via our acquisition of Annex Security. When the Axios compromise hit, our detection systems flagged the malicious dependency within six minutes. Within 24 hours, more than 2,000 organizations onboarded to Socket to block it. Where the funding goes: deeper investment in Firewall, massively expanding Certified Patches, moving protection closer to every point of install across the developer toolchain, and new product launches pushing Socket into a category we haven't entered before. We're hiring across engineering, sales, customer success, and threat intel. ❤️ Thank you to our customers, investors, and the open-source community for your support. Together, we’re making software safer for everyone.
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We’re excited to lead Exa's Series C, to back their ambition of perfecting web search, and making it ready for the age of intelligent agents. We’re entering a new era for search, built from the ground up around what AI can do. The signal from the market was consistent. Exa excels with the hardest queries – the long tail of high alpha searches where traditional engines fail. What struck us most was the default behavior: developers and agents are reaching for Exa first. Years before ChatGPT or the AI boom really started, Will Bryk and Jeffrey Wang were inspired by the transformer breakthrough and believed deeply that AI will fundamentally change the way we access information. So they set out on the path to build the search engine for a future where agents become the primary consumers of the web. We’re thrilled to partner with Will, Jeff, and the Exa team as they build the perfect search engine for agents and usher in a world of abundant information for all. By Sarah Wang, Jennifer Li, Steph Zhang, Jason Cui
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Andreessen Horowitz reposted this
Excited to announce Exa raised $250M in Series C funding at a $2.2B valuation, led by Andreessen Horowitz. Exa is an AI research lab building the market leading search engine for AI. Our search API now serves 5000+ companies and 400,000+ developers. Companies like Cursor, Cognition, HubSpot, and much of the Fortune 500 use Exa for the highest quality search over fresh web data. These are still the early days - in the next few years the number of searches from AI agents will be 1000x more than Google searches today. We are so excited to work with Sarah Wang who is joining our board. Existing investors doubled down: Benchmark, Lightspeed, Y Combinator, Excited for Scott Wu, Igor Babuschkin, Tal Broda and many other AI leaders to join the round as well. These past 5 years have been quite a rollercoaster ride toward that original vision of perfect search. I’m very lucky to now work with 100 of the best builders in the world who see the gravity of what this company can become. Perfect search awaits 🫡
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Andreessen Horowitz reposted this
I'm excited to announce that Amca has raised a $300M Series B at a $1B+ valuation to continue building America’s new industrial base. We're on a mission to reconstitute a supply chain that has too often put profit over country. This round was led by Varun Gupta and Raymond Tonsing at Caffeinated Capital, who are doubling down after leading our Series A. We also welcomed major participation from Connor Love at Lightspeed as well as support from existing investors Andreessen Horowitz, Lux Capital, Construct Capital, House Capital, and others. The gap between what America needs and what it can produce across aerospace, defense, and core infrastructure is the largest it has been in decades. This is especially true in sustainment of our military’s most important systems. We can no longer rely on an increasingly fragile and aging supply base for critical components to keep the country fully prepared for future conflict. Closing this gap requires a unique combination of America's storied past and its future. Amca rapidly develops new components where the country needs more sources of supply, then manufactures them in longstanding factories staffed by a highly skilled workforce with decades of experience. A year ago, we launched with our first factory acquisition. Today, Amca operates 7 factories across the country, including our rapid prototyping and testing HQ in El Segundo. Over the next 18 months, we'll deliver hundreds of critical parts and subsystems and help prove that America can build faster than anyone thought possible. If that excites you, come join us.
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A closer look at how equity is distributed across stakeholder groups after each round of funding Source: Carta
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Startups with VC funding are more likely to have cofounders Source: Carta
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Our weekly a16z Build newsletter — our list of open roles at breakout startups and early-stage founders looking for team members. This week: - Decagon: hiring an AI Engineer for the “Founder’s Office” team in SF - Glimpse: hiring a Customer Experience Manager in NYC - Partiful: hiring a Head of Engineering - QuiverAI: hiring a Design Engineer in SF - Zipline: hiring a Director of US Government & Federal Affairs in Washington DC ...and more.
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By Series C, employees collectively own more equity than the founders who started the company - at the median. Source: Carta
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