Deal Terms
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Quick Answer
The reduction in an existing shareholder's ownership percentage when new shares are issued, typically during a funding round.
Equity dilution occurs when a company issues new shares, reducing the percentage ownership of existing shareholders. If a founder owns 100% of 1 million shares and the company issues 250,000 new shares to investors, the founder's ownership drops from 100% to 80% (1M / 1.25M). Dilution is a fundamental trade-off in startup financing: founders give up ownership percentage to bring in capital that (ideally) makes their remaining percentage worth more in absolute terms. Typical dilution per round: 15-25% at pre-seed/seed, 15-20% at Series A, 10-15% at Series B and beyond. A founder who raises Pre-Seed through Series C typically retains 15-25% ownership.
Mechanically, dilution comes from three sources, and only one of them is the headline round. First, the new-money issuance itself: the investor's ownership equals investment divided by post-money valuation, and every existing holder is scaled down pro-rata by the new shares. Second, the option pool: incoming leads commonly require the pool to be created or topped up before their money comes in — priced into the pre-money — so the pool expansion dilutes only the existing holders, not the new investor. This "option pool shuffle" frequently costs founders more ownership than the round itself. Third, anti-dilution adjustments: if a later round prices below a prior round's original issue price, that preferred class's conversion ratio adjusts upward under the charter's anti-dilution provision. Broad-based weighted average is the prevailing market formula and adjusts modestly; full ratchet resets the conversion price to the new round's price and is considered punitive. All three mechanisms reduce ownership the same way — by adding shares to the denominator.
In Practice
A worked cap-table example. A company has 10,000,000 shares outstanding, with founders holding 7,500,000 (75%) and early holders the rest. A Series A term sheet proposes $6M at an $18M pre-money, and requires the option pool topped up to 2,000,000 unissued shares before closing. Step one, the pool: 2,000,000 new pool shares take fully diluted shares to 12,000,000 — founders are already down to 7,500,000 ÷ 12,000,000 = 62.5% before any money moves. Step two, pricing: $18M pre-money ÷ 12,000,000 shares = $1.50 per share. Step three, the investment: $6M ÷ $1.50 = 4,000,000 new preferred shares, for a $24M post-money and 16,000,000 total shares. Final ownership: the investor holds 4,000,000 ÷ 16,000,000 = 25.0%, the pool 12.5%, and the founders 7,500,000 ÷ 16,000,000 = 46.875%. Founders gave up 28.125 points of ownership in one round — and 12.5 of those points came from the pool top-up, not the investor's check, which is exactly why pool size is a negotiable term.
Why It Matters
Every founder needs to understand dilution math because it directly determines how much of the company they own at exit. A founder with 20% of a $1B company has $200M — but getting to that outcome typically requires 4-5 rounds of dilution. The key insight: dilution is acceptable when the capital raised makes the total pie much bigger.
The discipline that separates founders who manage dilution well from those who discover it at exit is modeling in absolute dollars, not percentages. In the worked example above, the founders' 46.875% of a $24M post-money company is $11.25M of paper value — the question worth asking at every term sheet is whether the capital raised will grow the company's value faster than it shrinks your slice. Percentage anxiety leads founders to under-raise; dollar-value thinking leads them to raise what the plan actually requires.
VC Beast Take
Practically, every founder should keep a live pro-forma cap table and re-run it before signing anything: current shares by class, the proposed pool top-up, the new issuance, and — for later rounds — any anti-dilution adjustment a down round would trigger. Two negotiating notes from how these deals actually get done. Pool size should be justified by a bottoms-up hiring plan for the next 18–24 months, not accepted as a round-number default — every unissued pool share at exit is ownership founders gave away for nothing. And when comparing term sheets, compare post-money founder ownership after the pool adjustment, not headline pre-money valuations: a higher pre-money with a bigger required pool can leave founders with less than a lower pre-money with a right-sized one.
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Equity dilution occurs when a company issues new shares, reducing the percentage ownership of existing shareholders. If a founder owns 100% of 1 million shares and the company issues 250,000 new shares to investors, the founder's ownership drops from 100% to 80% (1M / 1.25M).
Understanding Equity Dilution is critical for founders navigating the fundraising process. It directly impacts deal terms, valuation, and the relationship between founders and investors.
Equity Dilution falls under the deal-terms category in venture capital. This area covers concepts related to the financial and legal terms that define investment agreements.
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