Fully Diluted Shares

Also called: Fully diluted, Fully diluted shares outstanding

TL;DR

The total share count assuming every option, warrant, convertible note, SAFE, and reserved pool has been exercised or converted.

Fully diluted shares give the most conservative view of cap-table ownership. The count includes outstanding common and preferred shares, granted options (vested and unvested), warrants, convertible debt, SAFEs, and any unallocated option pool. Calculating ownership percentages on a fully diluted basis is standard for new-round modeling.

The gap between basic shares (only common + preferred) and fully diluted shares is usually meaningful, often 15 to 25% at later stages. New investors and acquirers always work in fully diluted terms.

Formula

Fully Diluted Shares = Common + Preferred + Outstanding Options + Unallocated Option Pool + Warrants + SAFEs/Notes (as-converted)

Outstanding Options , Granted but unexercised employee options
Unallocated Option Pool , Pool reserved for future grants but not yet issued
SAFEs/Notes (as-converted) , Shares that would be issued if all SAFEs and convertible notes converted today at current terms

Per-share price in a priced round is post-money ÷ fully-diluted shares, ignoring SAFEs or the option pool will undercount dilution.

Worked example

A cap table: 8M common + 2M preferred + 1M outstanding options + 0.5M unallocated pool + 0.3M warrants + 0.4M SAFEs (as-converted) = 12.2M fully-diluted shares. At a $61M post-money, price per share = $61M ÷ 12.2M = $5.00.

Common pitfalls

•Quoting basic ownership percentages and being surprised by fully diluted dilution.
•Forgetting to include unallocated option pool in the fully diluted count.
•Failing to model how new SAFEs convert into the fully diluted base.

When this shows up in a pitch deck

Cap-table snapshot in the data room shows the fully diluted view; deck slides usually omit it.

Related terms

Dilution

The reduction in an existing shareholder's ownership percentage caused by issuing new shares in a financing or an option grant.

Option Pool

Equity reserved for future employee, advisor, and contractor grants, usually sized as 10 to 20% of fully diluted shares.

Common Stock

The base equity class held by founders and employees, with voting rights but no preference rights or dividends.

Preferred Stock

The equity class issued to investors, carrying special rights such as liquidation preference, anti-dilution protection, and protective covenants.

Cap Table

A spreadsheet or system-of-record showing every shareholder, share class, option, warrant, and convertible instrument outstanding in a company.

Pitch deck pillar pages

Long-form deep dives on the slides Fully Diluted Shares most often shows up on.

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