David Rose
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The 20% Rule: What UK and EU Founders Must Understand About US VC Dilution

If you’re a European founder preparing to raise venture capital in the United States, you’re about to enter a market with its own rules, rhythms, and expectations. One of the most fundamental—yet often misunderstood—dynamics is the 20-30% dilution standard that governs US VC rounds.

I learned this lesson the hard way across five venture-backed startups and three CEO roles. What initially felt like an arbitrary number turned out to be the key that unlocks how professional US investors think about valuations, portfolio construction, and ultimately whether they’ll write you a check.

Understanding this single principle will save you time, preserve your credibility, and help you navigate fundraising conversations with confidence. Let me explain why.

Sell People What They Want to Buy

Here’s the reality: US venture capitalists want a 20-30% equity stake in each company they invest in, at each round of funding.

This isn’t a negotiating position. It’s not a starting point for discussion. It’s baked into their fund economics, their internal modeling, and their investment thesis. When a US VC firm raises their fund and commits to their LPs (limited partners), their IRR projections and portfolio return models are built on the assumption of taking 20-30% ownership positions in each portfolio company.

Think about it from their perspective. They’re managing a portfolio of 20-40 companies. They need meaningful ownership stakes to move the needle on their fund returns. A 10% or 13% position simply doesn’t work with their math—especially when they’re planning for follow-on investments in subsequent rounds.

This creates an important strategic imperative for founders: going into a fundraise with an “out of market” pitch around equity dilution will add immediate friction to your process.

It’s common for European founders walk into US pitch meetings proposing 12% or 15% dilution for their round. The reaction is rarely positive. At best, you get puzzled looks. At worst, you’ve signaled that you don’t understand the US market—and that immediately undermines your credibility as someone capable of building a successful business in America.

The investors might not say it directly, but they’re thinking: “If this founder doesn’t understand basic US VC market dynamics, what else don’t they understand about operating here?”

The solution is straightforward: sell them what they want to buy. Come to the table expecting to offer 20-30% dilution. You’re not being taken advantage of—you’re simply operating within the market standard that makes deals happen efficiently.

How 20% Dilution Drives Your Valuation

Once you internalize the 20-30% dilution standard, something remarkable happens: fundraising gets simpler.

In the early days of my first startups, I spent countless hours agonizing over pre-money and post-money valuations. My team and I built elaborate financial models, trying to justify our valuation through revenue projections and market comparables. We’d get into protracted negotiations with investors over whether we were worth $12M or $15M pre-money.

It was exhausting. And ultimately, it was beside the point.

Here’s what I eventually learned: there are no rational discounted cash flow models or traditional valuation frameworks that work reliably for early-stage tech companies. You don’t have stable cash flows to discount. Your revenue might be minimal or non-existent. The traditional tools of corporate finance simply don’t apply.

This reality gave rise to instruments like convertible notes and SAFEs—mechanisms that explicitly postpone the valuation question until a later priced equity round when the company has more traction and data points.

But here’s the insight that changed how I approached fundraising: if you know how much capital you’re raising and you accept the 20-30% dilution standard, the pre-money and post-money valuations are simply mathematical outputs. They’re not the inputs you negotiate—they’re the results of a simple calculation.

Let me show you the math:

Example 1: You’re raising $5M and investors will get a 20% equity stake.

  • Post-money valuation = $5M ÷ 0.20 = $25M
  • Pre-money valuation = $25M – $5M = $20M

Example 2: You’re raising $10M and investors will get a 20% equity stake.

  • Post-money valuation = $10M ÷ 0.20 = $50M
  • Pre-money valuation = $50M – $10M = $40M

Example 3: You’re raising $5M and investors will get a 25% equity stake.

  • Post-money valuation = $5M ÷ 0.25 = $20M
  • Pre-money valuation = $20M – $5M = $15M

See how this works? The valuation is a mathematical plug, not a fundamental assessment of your company’s worth based on DCF models or comparable transactions.

Professional US investors understand this math intimately. In fact, this is typically how they think about pre-money and post-money valuations. They start with the ownership percentage they need, calculate backwards to the valuation, and determine if that valuation feels reasonable given your traction, market, and team.

Once I understood this dynamic, I completely changed how I answered valuation questions. When an investor would ask, “What’s your pre-money valuation?” I would simply respond: “We’re raising $5M and expect to be diluted 20% on the round.”

The reaction from professional investors was immediate and positive. They’d quickly do the math in their heads, nod, and move on to discussing the actual substance of the business. This approach accomplished two things:

  1. It signaled market sophistication. I was demonstrating that I understood how US VC fundraising actually works.
  2. It reframed the conversation. Instead of debating whether my startup was worth $18M or $22M pre-money—a discussion with no objective answer—we could focus on whether the business deserved $5M in investment at all.

The Vetting Goes Both Ways

I also started using this exchange as a way to vet potential investors. If someone couldn’t immediately understand “we’re raising $5M at 20% dilution” and still wanted to dig into elaborate pre-money valuation calculations, it was a red flag.

It told me this person either didn’t understand the US VC market or was going to be difficult to work with. Either way, they probably weren’t someone I wanted on my cap table or my board of directors. The best investors got it immediately and moved on to the important questions about product, market, and execution.

The Bottom Line for European Founders

If you’re a UK or EU founder preparing to raise venture capital in the United States, internalize this principle: expect 20-30% dilution per round, and start your conversations at 20% to minimize dilution.

This isn’t about being taken advantage of. This is about understanding the market you’re entering and operating within its norms. The US venture capital market is the deepest and most sophisticated in the world, but it has its own rules. Fighting those rules doesn’t make you a savvy negotiator—it makes you someone who doesn’t understand the game.

Lead with the dilution percentage, let the valuation math fall out naturally, and spend your energy on what actually matters: convincing investors that your business is the one that’s going to deliver extraordinary returns.

That’s the conversation worth having.

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