a16z (Andreessen Horowitz)
The complete
founder's
playbook
Everything you need to know before approaching a16z, how they think, what they've backed, who decides, how their biggest deals actually happened, and exactly how to position yourself. Built from public data, portfolio analysis, partner interviews, and 13 years on both sides of the table.
Who a16z actually is, and why it matters
Founded in 2009 by Marc Andreessen and Ben Horowitz, a16z went from zero to the most powerful venture firm in Silicon Valley in under a decade. Marc wrote the internet's first widely-used web browser (Mosaic/Netscape). Ben was CEO of LoudCloud/OpsWare. Both had been on both sides of the table.
What makes a16z fundamentally different: they operate more like a talent agency than a traditional VC. Of their ~600 employees, only about 10% are on the investment team. The rest are operators, recruiters, marketing specialists, business development leads, policy experts, all dedicated to helping portfolio companies grow.
Their thesis has evolved from "software is eating the world" (Marc's famous 2011 essay) to "AI is eating software", a contrarian bet that AI-native companies will replace the previous generation of software companies. This thesis drives the vast majority of their current deployment.
"We're elephant hunting, going after big game!"
In January 2026, a16z raised $15 billion across five new funds, representing over 18% of all venture capital dollars allocated in the US in 2025. Total AUM is now over $90 billion. They raised it in just three months, from existing LPs, in the worst VC fundraising year since 2017.
Gian's Insider TakeThe "talent agency" model matters enormously for founders. When a16z backs you, you don't just get capital, you get a 600-person support machine. That's their pitch to founders. But it also means they're evaluating you differently: they're asking "can we deploy our whole machine behind this?" Your narrative needs to show not just why your business is great, but why you're the kind of founder who can fully leverage a16z's network, operators, and platform. The founders who win with a16z are the ones who think about fundraising as a partnership, not a transaction.
The money, fund structure & check sizes
a16z's January 2026 fundraise broke down across five dedicated funds:
Plus $700M for Bio & Health and $3B for "other venture strategies." Total: $15 billion.
Check Sizes by Stage
In 2025, a16z made 175 new investments, the second most active post-seed investor globally behind only Y Combinator. As of February 2026, they've already made 20 new investments.
But those averages are misleading. a16z also writes small cheques through Speedrun, their accelerator, up to $1M per company, 60-70 companies per cohort, twice a year. Since launching in 2023, Speedrun has funded 120+ pre-seed/seed startups with over $100M invested.
Gian's Insider TakeThe Speedrun accelerator is the most accessible entry point to a16z for early-stage founders. $500K upfront for 10%, with another $500K on your next round. It's more expensive than YC (which takes 7% for $500K), but you get direct access to a16z's 600-person platform. If you're pre-seed or seed and targeting a16z, Speedrun might be a better path than trying to get a partner meeting cold. But you still need a sharp narrative, they accept ~60 from thousands of applicants.
The portfolio, what they've backed
a16z has backed 121 unicorns and generated over $600B in combined portfolio valuation. The AH Fund III alone is at 11.3x net TVPI, one of the best performing large venture funds of all time.
Recent 2025-26 Investments
Notice the range, from $1M Speedrun cheques to $500M+ mega-rounds:
Larger recent deals: Anysphere/Cursor, Harvey ($300M), ElevenLabs ($500M at $11B), Kalshi ($185M), Flock Safety, Substack, and Databricks. a16z participated in 175 post-seed deals in 2025.
How the deals actually happened
Case Study 1: Coinbase, The Contrarian Crypto Bet
Gian's Insider TakeThe Coinbase story is a masterclass in what a16z actually values: contrarian conviction. In 2013, every smart person said crypto was a scam. Dixon saw it differently. He didn't just invest, he evangelised through his blog, built an entire division around his thesis, and stayed through multiple crashes when others ran. When a16z asks for "a unique insight about why your market is about to change," this is what they mean. Not "the market is growing" but "everyone is wrong about this, and here's why." That's the level of insight you need to walk in with.
Case Study 2: Speedrun → Seed → Scale, The New a16z Playbook
"We focus on very early-stage startups and prioritise the backgrounds of the founders over the ideas. The expectation is that the idea will change and evolve."
Gian's Insider TakeRead that Speedrun quote again: "we prioritise the backgrounds of the founders over the ideas." This is the Narrative pillar at its most explicit. a16z is telling you: your founder story, your domain expertise, your unique background, that's what gets you in. Not the idea. Not the deck. The Three I's framework builds exactly this: Insight (your unique understanding), Influence (your ability to make people believe), Iterate (your discipline to keep improving). If Speedrun accepts 60 from thousands, your founder narrative needs to be in the top 1%.
What they actually look for
a16z's investment thesis since 2025: "AI is eating software." In 2025, their portfolio was approximately 40% healthcare AI, 25% AI infrastructure, and 20% vertical AI copilots. But their criteria go deeper than sector:
The Three Signals Speedrun Looks For
"Capital is a commodity. What Speedrun offers is unfair advantages, introductions to big customers, access to world-class talent, connections to the a16z network, and the kind of credibility that changes how investors view your company."
Gian's Insider Takea16z's criteria map perfectly to the Three I's. Insight = their demand for a contrarian thesis about a massive market. Influence = the founder quality and storytelling ability that makes a partner champion you. Iterate = the traction and execution speed that proves you can convert insight into reality. When they say "traction is the single strongest signal," they're telling you: don't pitch a future, show what you've already built. But pair it with a vision for why this is just the beginning.
What they don't want
Your market is too small. With billion-dollar fund sizes, a16z needs $10B+ exits to return the fund. If your TAM doesn't support that, you're not a fit regardless of team quality.
Your insight isn't contrarian. "The market is growing" is an observation. "Everyone is wrong about X because Y" is an insight. Ben Horowitz famously dismissed Hadoop, the entire Big Data trend, because he didn't believe in the architecture. They want founders with that level of conviction.
You can't articulate founder-market fit. Why you, why this, why now, in 90 seconds. If your pitch starts with market analysis instead of your personal connection to the problem, you're telling the wrong story.
You've already raised a Series A. For Speedrun, you need to be pre-seed or seed. For their main funds, they invest across stages but the earlier you come, the more ownership they get.
You're not building something AI-native (and can't explain why). 40% healthcare AI, 25% AI infrastructure, 20% vertical AI copilots in their 2025 portfolio. If you're not AI, you need a very sharp answer for why you win without it.
Gian's Insider TakeThe AI positioning question is the most common stumbling block I see with founders targeting a16z right now. You don't have to be an AI company, but you need a one-sentence answer for "how does AI affect your market, and why do you win regardless?" If you can't answer that confidently, every a16z partner will flag it. We spend a full session on AI positioning in the program because it's become table stakes for Tier 1 conversations.
The partners, who covers what
a16z has ~311 partners and a 470-person team across 5 offices. Here are the key decision-makers:
Gian's Insider Takea16z is the largest firm on this list, 470 people, 311 partners. That's both an advantage and a challenge. The advantage: there's almost certainly someone who covers your exact sector. The challenge: getting to the right person through the noise. Your warm intro path needs to be precise. If you're building in consumer growth, you need a path to Andrew Chen specifically. Crypto? Chris Dixon. Enterprise infrastructure? Martin Casado. Use the connector strategy: identify who in your network knows these partners or their portfolio founders, and build those relationships first.
How to approach a16z, including Speedrun
a16z has multiple entry points, more than most Tier 1 firms:
a16z's dealflow priorities:
Gian's Insider Takea16z has more entry points than any other Tier 1 firm, which is actually a disadvantage for most founders, it creates the illusion of accessibility. The reality: with 175 investments from thousands of inbound, the conversion rate is still tiny. The founders who get backed are the ones who combine multiple signals: they apply to Speedrun AND build warm intro paths AND engage with a16z's content ecosystem. It's the same Network, Narrative, Process framework, but applied to a firm that has more surface area than Sequoia or Index.
What this means for your raise
Gian's Insider TakeEverything in this report maps to the same three pillars I've seen across 120+ funded raises: Network (warm intros, portfolio founder connections, Speedrun as an entry point), Narrative (contrarian insight, founder-market fit, AI positioning, Three I's), and Process (batched meetings, communication discipline, manufactured urgency). a16z backed Coinbase because of contrarian conviction. They fund Speedrun companies based on founder quality over ideas. They deploy 600 people to support the winners. Which of these three pillars is your gap?
Want to know where
you actually stand?
Take the 2-minute diagnostic that scores you against what a16z actually looks for, across Network, Narrative, Process, and Traction.
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