Dilution and Cap Tables

What is a cap table, exactly?#

A useful cap table has three layers that should reconcile but are not interchangeable:

1. Legal record — what the company has validly authorized and issued.
2. Ownership model — the common-equivalent, as-converted, and fully diluted views used for decisions.
3. Scenario model — what ownership becomes after a proposed financing, conversion, pool increase, or exit.

For a Delaware corporation, the statutory stock ledger records stockholders of record, their addresses, registered shares, and all issuances and transfers. Delaware law permits these records to be kept electronically — including on distributed databases — provided they can produce the required stockholder list and be converted into clearly legible paper form on request.

A planning cap table is broader than that ledger: it may include unexercised options, RSUs, the unissued pool, warrants, SAFEs, notes with accrued interest, pro forma financing shares, and waterfall calculations. Calling the spreadsheet a "stock ledger" does not make forecasted shares legally issued. Calling the ledger a "fully diluted cap table" does not make it decision-complete.

What vocabulary prevents modeling errors?#

There is no safe universal definition of "fully diluted." A term sheet, a SAFE, a note, a board report, and an accounting calculation may each use a different denominator. Quote the definition from the document you are modeling and map every component to it.

Why does this matter to founders?#

Fundraising terms become share counts. A $20M pre-money and a $5M check imply $5M / ($20M + $5M) = 20% new-investor ownership — but only after the fully diluted pre-money definition is fixed. If the term sheet also requires an option-pool increase inside the pre-money capitalization, existing holders bear that dilution before the investor buys a single share. The same arithmetic applies whether the round is labeled seed or Series A; the label does not change the model.

Employee offers depend on the denominator. "10,000 options" is not an ownership statement. Option ownership = option shares / fully diluted shares. An offer should state the percentage at a dated capitalization, note that future dilution is expected, and distinguish a granted option from an informal promise.

Investors diligence the cap table before closing. They verify legal issuance and approvals, founder vesting, plan capacity, conversion terms, outstanding promises, voting thresholds, and whether there are enough authorized shares to close. A cap-table surprise delays the round, changes the share price, or costs trust.

Ownership is not proceeds. At a simple common-stock exit, Holder proceeds = distributable proceeds x ownership %. Venture outcomes are rarely that simple: debt and transaction expenses come first, and preferred stock may take a preference or participate. The cap table supplies share counts; the waterfall supplies payout rights.

Worked example: a priced round with a pre-money option-pool top-up#

Pre-round capitalization:

Proposed financing: $20,000,000 pre-money, $5,000,000 new investment (20% post-money), required unissued pool after closing of 15%, pool top-up included in the pre-money capitalization, no convertibles or warrants.

The misleading shortcut#

Ignoring the top-up: price = $20M / 10M = $2.00, investor shares = $5M / $2.00 = 2.5M, giving founders 64%, employees 8%, pool 8%, investor 20% on 12,500,000 shares.

But the pool is now 8%, not the required 15%. The model is incomplete.

Solving the top-up#

Let X be the new pool shares added pre-money. The investor contributes one-quarter of the $20M pre-money value, so:

Investor shares = 0.25 x (10,000,000 + X) and Post-round total = 1.25 x (10,000,000 + X)

The unissued pool must equal 15% of the post-round total:

1,000,000 + X = 0.15 x 1.25 x (10,000,000 + X)

1,000,000 + X = 1,875,000 + 0.1875X → 0.8125X = 875,000 → X = 1,076,923

Correct post-round cap table#

Interpreting founder dilution. Founders fell from 80% to 57.78% — 22.22 percentage points, or 27.78% relative dilution (1 - 57.78% / 80%). The investor bought 20%, but the founder gave up considerably more, because the pre-money pool top-up is funded entirely by existing holders. This is why pool timing is a real negotiation, not a formality: the same headline valuation produces materially different founder outcomes depending on whether the pool sits pre- or post-money.

How do SAFEs and notes enter the model?#

Post-money SAFEs. A quick estimate before the priced round's new money is SAFE ownership = purchase amount / post-money cap. Post-money SAFEs convert immediately before the priced round; the new money then dilutes founders, other stockholders, and SAFE holders. The pool increase is a separate dilution event. The closing model must use the signed SAFE's Company Capitalization definition, not the shortcut.

Convertible notes. Conversion amount = principal + convertible accrued interest, then Conversion shares = conversion amount / conversion price. Track each tranche separately — different caps and issue dates do not combine into an average instrument.

Pro rata rights. An investor maintaining its percentage buys roughly target ownership x new primary capital. The exact figure shifts with pool increases, convertibles, and multiple closings.

Method matters. When convertibles are outstanding, the same headline inputs can produce different share prices depending on the method used — Cooley documents three (pre-money, percentage-ownership, and dollars-invested) that allocate conversion dilution differently between founders and new investors. Resolve which method applies in the term sheet, not at the closing table.

How do dilution, anti-dilution, and pro rata differ?#

• Ownership dilution: percentage falls because the denominator grew.
• Economic dilution: the claim on value weakens through senior rights, even if percentage is unchanged.
• Voting dilution: voting power falls because new votes or class rights were issued.
• Anti-dilution protection: a preferred conversion-ratio adjustment triggered by a lower-priced issuance.
• Pro rata right: a right to invest more cash to maintain percentage.

Anti-dilution protection does not prevent all dilution. A broad-based weighted-average adjustment protects an investor in a down round while leaving that investor diluted by an ordinary up round.

Sources#

1. U.S. Securities and Exchange Commission. Small Business Glossary and Common Startup Securities.
2. State of Delaware. 8 Del. C. §§ 219 and 224. Statutory stock-ledger definition and permitted record form.
3. Cooley GO. Negotiating the Option Pool and Calculating Share Price With Outstanding Convertible Notes or Safes.
4. Y Combinator. New Standard Deal. First-party explanation of post-money SAFE conversion order and pool treatment.
5. National Venture Capital Association. Model Legal Documents. Model financing documents implementing stock rights, voting, and transfer restrictions.

Educational note: This page explains ownership mechanics for founders. It is not legal, tax, accounting, or investment advice. Cap-table records have legal consequences — reconcile them with counsel before a financing or exit.