What Is Share Dilution

Share dilution meaning

What is share dilution? It’s what happens when a company issues new shares. You still hold the same number, but each one is now a smaller slice of the company. Your share of votes, dividends and sale proceeds shrinks with it, unless a contract says otherwise.

Take a small firm with ten shareholders, each holding one share and 10 percent. The company issues ten new shares and a single investor buys them all. That investor now owns half, and everyone else is down to 5 percent. Nobody sold anything, yet every original stake was cut in half.

Two things look similar but aren’t dilution: a stock split, where everyone gets more shares in proportion, and a buyback, which does the opposite and leaves each remaining share covering more of the company.

How equity dilution happens 

Equity dilution usually starts with a company that needs money: to pay off debt, build a product or buy another business. It issues shares and gets cash or assets in return.

Sometimes the sellers of an acquired company take new shares instead of cash, which has the same effect.

If existing shareholders sell shares they already own (a secondary sale), nobody is diluted.

Only newly issued shares do that.

What Causes Share Dilution? 

Options, warrants and convertible securities 

Every exercised option creates a new share. Warrants, convertible notes and SAFEs do too, once they convert. Convertible notes often catch founders off guard. The conversion price depends on the discount and valuation cap, so if the company takes off, noteholders can end up with far more shares than anyone planned for. 

Employee equity and option pools

Paying people in equity dilutes everyone else too. Options vest over several years and some employees leave before then, so the company can’t know in advance how many will be exercised. Investors also usually ask for an option pool to be set aside before the round.

Future hiring costs get priced in from day one, and the existing shareholders, mostly founders, carry them. Tax rules for employee schemes vary by country, so check yours locally.

How to Calculate Share Dilution

Share dilution formula

To calculate share dilution, divide your shares by the total number of shares after the issue, then compare that with your old stake. You can express the change two ways:

• Percentage points: old stake minus new stake.

• Relative dilution: new shares divided by total shares after the issue.

  
  

People mix these up in negotiations all the time, so say which one you mean.

What Are Fully Diluted Shares?

Basic shares vs fully diluted shares

Basic shares are the ones actually issued. Fully diluted shares also count everything that could turn into shares: unexercised options, the reserved pool, warrants, convertible bonds and SAFEs.

Here’s how much that changes things. A founder holds 6 million of 10 million issued shares, so 60 percent on a basic count. Add a 1.5 million option pool and 500,000 shares under a SAFE, and the fully diluted total is 12 million. The same founder now holds 50 percent.

Why fully diluted ownership matters in fundraising

Investors price deals on a fully diluted basis, because it shows the cap table once all those rights have been used. So when a term sheet quotes a percentage, ask which count it’s based on. The gap between the two can be bigger than the effect of the investment itself.

How Share Dilution Affects Founders and Investors

Founder dilution across funding rounds

Founder dilution compounds, since every round sells a piece of what’s left. A sole founder starts at 100 percent. The seed round issues 20 percent, leaving 80. Series A issues another 20, leaving 64. Series B issues 15, leaving 54.4. And that’s before any option pool, so real numbers tend to be lower. The figures are illustrative, but modeling a few rounds ahead shows when you might lose the majority or a blocking minority.

Ownership, voting rights, and economic interests

Dilution can cut your votes, dividends and sale proceeds all at once, although share classes can make voting power differ from ownership percentage.

A smaller stake isn’t automatically a worse one. If you own 10 percent of a €2 million company, you hold €200,000. After an investment you own 8 percent of a €5 million company, which is €400,000. What matters is whether the value of each share goes up. A round priced above the previous one adds value for everyone, while a down round takes it away.

What Is Anti-Dilution Protection?

How anti-dilution provisions work

Anti-dilution protection is a contract right, usually held by investors. If the company later sells shares below the price the investor paid, the conversion price of the investor’s preferred shares is lowered, so they get more ordinary shares. The cost shifts to the other shareholders, mostly founders. It normally applies only to down rounds and usually excludes option pool issues.

Full-ratchet vs weighted-average protection

A full ratchet resets the conversion price to the lowest price of any later issue, no matter how few shares were sold at it. A weighted average also looks at how many new shares were issued, so a small issue at a low price barely moves the conversion price. Full ratchet is far harsher on founders, which is why weighted average is more common.

For example, an investor paid €1.00 per share, and the company later issues 2,000,000 shares at €0.50 with 10,000,000 outstanding. Under a full ratchet the conversion price drops to €0.50. Under a broad-based weighted average it drops to about €0.92.

Company law can help too. Shareholders often have pre-emption rights, meaning the right to buy new shares first. In the EU this comes from the Company Law Directive, in the UK from the Companies Act 2006. Private companies can often exclude these rights in their articles, so check your own documents.

Final Thoughts

Some dilution is unavoidable, and avoiding it at any cost isn’t worth it. Before you sign a term sheet, look past the headline valuation. Know who owns what on a fully diluted basis, what rights the new money gets and how the next round will change the split.

At icon.partners we review cap tables, term sheets and shareholder agreements, and we look at how the proposed terms affect control now and in future rounds. A review before signing shows what the deal is really worth, what guarantees you’d be giving investors and what to ask for in return.