Equity Dilution

What Is Equity Dilution?

Equity dilution occurs when a company issues new shares, reducing the ownership percentage of all existing shareholders. When you raise a funding round, grant employee stock options, or convert SAFEs and convertible notes into equity, the total number of shares increases — and your slice of the pie becomes proportionally smaller.

Dilution is not inherently bad. A founder who owns 60% of a startup worth $2M is less wealthy than a founder who owns 20% of a startup worth $50M. Accepting dilution in exchange for capital, talent, and growth is a rational trade-off. The key is understanding exactly how much dilution you are taking on, at what valuation, and ensuring the value created exceeds the ownership surrendered.

How Dilution Works: A Step-by-Step Example

A startup is founded with two co-founders:

• Founder A: 6,000,000 shares (60%)
• Founder B: 4,000,000 shares (40%)

Step 1 — Option Pool Creation (Pre-Seed) Before raising, a 10% option pool is created. Using the formula: pool shares = (target % x total existing shares) / (1 - target %), the pool requires approximately 1,111,111 new shares.

• Founder A: 54.5%
• Founder B: 36.4%
• Option Pool: 9.1%

Step 2 — Pre-Seed Round ($300K at $2.7M pre-money = 10% to investor)

• Founder A: 49.1%
• Founder B: 32.7%
• Option Pool: 8.2%
• Pre-Seed Investor: 10%

Step 3 — Seed Round ($1.5M at $8.5M pre-money = 15% to investor, new 10% pool refresh)

• Founder A: ~35%
• Founder B: ~23%
• Option Pool: ~10%
• Pre-Seed Investor: ~7.3%
• Seed Investor: ~15%

At the end of a typical Seed journey, founders collectively own approximately 55–65% of the company on a fully diluted basis. This is generally considered healthy.

Types of Dilution Events

Investment Rounds: Each priced round issues new preferred shares to investors. The dilutive impact depends on the percentage the investor is taking and whether a new option pool is created.

Option Pool Top-Ups: Expanding the employee stock option pool dilutes all existing shareholders. Whether this happens pre-money or post-money (relative to the new investment) significantly affects who bears the dilution.

Convertible Instrument Conversion: When SAFEs and convertible notes convert to equity at a priced round, the resulting shares dilute all shareholders. Multiple convertible instruments converting simultaneously can cause surprise dilution if not modelled in advance.

Warrant Exercises: Some investors and service providers receive warrants — the right to purchase shares at a fixed price. When exercised, warrants create new shares and dilute existing holders.

Anti-Dilution Protections

Anti-dilution provisions protect investors (not founders) from dilution in down rounds — situations where new shares are issued at a lower price than previous rounds.

Broad-Based Weighted Average Anti-Dilution is the most founder-friendly and most common standard. It adjusts the investor's conversion price based on a formula that accounts for both the new lower share price and the number of shares issued. The adjustment is proportional and shared across all parties.

Full Ratchet Anti-Dilution is the most aggressive investor protection. It adjusts the investor's conversion price to match the new lower round price exactly, as if they had invested at the lower price from the start. This can cause extreme founder dilution in down rounds and should be strongly resisted.

Managing Dilution as a Founder

The most effective strategies for managing dilution:

1. Raise at the highest justifiable valuation: Every increment in pre-money valuation reduces the percentage you give up. Achieving clear milestones before fundraising (revenue, user growth, product launch) increases your negotiating leverage.

1. Negotiate option pool timing: Push for the option pool to be created post-money rather than pre-money. This means incoming investors share the dilution rather than founders absorbing it entirely.

1. Model before you sign: Always build a cap table model before accepting a term sheet. Tools like Carta, Pulley, or even a spreadsheet can show you exactly what your ownership looks like post-round, post-option-pool, and after outstanding SAFEs convert.

1. Minimise the number of small investors: Having 30 angel investors each owning 0.5% creates administrative complexity and potential governance challenges. Use SPVs to consolidate angels where possible.