What Is a Cap Table? The Complete Founder's Guide

A cap table is the record of who owns what in your company — every founder, investor, employee option, and unconverted SAFE, shown in shares and as a percentage. It sounds simple. It rarely stays simple, because every funding round, every new hire's option grant, and every SAFE that converts changes the numbers for everyone else on the table, not just the person receiving new equity.

Get it wrong and you'll misquote your ownership to an investor, misjudge what a round costs you, or find at exit that the number in your head was never right. This guide covers what a capitalisation table tracks, how to read one, and the mistakes that trip founders up most often.

What a cap table actually tracks

At its core, a cap table is a list of every security your company has issued or promised, tied to the entity or person who holds it. A complete one covers four categories.

• Founders' common stock — the shares issued at incorporation, usually subject to a vesting schedule even for founders.
• Investor preferred stock — one row per round, since each round typically carries its own price, liquidation preference, and other terms. See preferred stock vs common stock for how these differ from what founders and employees hold.
• The option pool — shares reserved for current and future employees, split between options already granted and options still unallocated.
• Convertible instruments — SAFEs and convertible notes that haven't converted into priced shares yet, but that everyone knows will eventually claim a slice of the table.

That last category is where a lot of confusion starts. A SAFE holder isn't a shareholder yet — they hold a contractual right to receive shares later, usually at the next priced round. Until that conversion happens, a good cap table still shows their expected stake, because ignoring it would understate how diluted the existing table already effectively is. The conversion maths itself follows a fixed set of rules involving the valuation cap and discount rate agreed in the SAFE — it's worth understanding before you sign one, not after.

Issued shares vs fully diluted shares

This is the distinction that causes the most confusion, and it's worth being precise about. Issued shares are shares that legally exist right now — founder stock granted, preferred stock sold, options that have been exercised. Fully diluted shares add everything that could turn into a share: unexercised but granted options, the unallocated portion of the option pool, warrants, and any SAFEs or notes converted at their expected terms.

Your ownership percentage looks different depending on which denominator you use. Say you hold 1,000,000 shares. If only 8,000,000 shares are issued today, you own 12.5%. But if the fully diluted share count — including a 1,500,000-share option pool that's only half allocated and a SAFE that will convert into 500,000 shares — comes to 10,000,000, your real stake is 10%. Both numbers are technically true. Only one of them is the one an acquirer, an investor, or a court will use to work out what you're entitled to.

This is why serious cap tables, and every offer letter that quotes an option grant as a percentage, should specify fully diluted ownership explicitly. If a number doesn't say which basis it's using, ask. It's a two-second question that avoids a very unpleasant surprise later. Our fully diluted glossary entry covers the mechanics in more depth if you want the formal definition.

A realistic example cap table

Here's a simplified post-seed cap table for a company that's raised one round, hired a small team, and reserved an option pool. All figures are fully diluted.

Notice that the option pool appears as two separate rows. That split matters: 8% is already promised to named employees, while the other 7% is still available for future hires. Lumping them together hides how much runway you actually have left before you need to top the pool up again — a decision that dilutes existing holders when it happens, and one that founders routinely underestimate the size of until they see it laid out row by row.

How to read a cap table, column by column

Every cap table you'll encounter, whether it's a spreadsheet or dedicated software, is built from the same handful of columns. Knowing what each one answers makes the whole document far less intimidating.

• Holder — the legal name of the founder, investor entity, or employee the row belongs to.
• Security type — common stock, preferred stock (which series), an option grant, a warrant, or an unconverted SAFE or note.
• Shares — the count of shares actually issued for that row, or the shares that security would convert into.
• Price paid or invested — what the holder paid per share, or how much they invested in total, which matters for calculating returns and for tax purposes.
• Issued ownership % — the row's shares divided only by shares issued today.
• Fully diluted ownership % — the row's shares divided by the fully diluted share count described above, including the whole option pool and any pending conversions.
• Vesting status — how much of the grant has actually vested, since unvested shares can still be clawed back if someone leaves early.

If a cap table you're looking at is missing the fully diluted column, or doesn't distinguish granted from unallocated pool shares, treat that as a warning sign rather than a formatting quirk. It's usually a sign the underlying spreadsheet hasn't kept up with the company's actual complexity.

Who actually reads your cap table

A cap table isn't just an internal bookkeeping exercise — several outside parties will look at it closely, often at moments when you can least afford it to be wrong.

• New investors, during diligence on a fresh round — they're checking for a clean structure, no orphaned or unaccounted-for SAFEs, and option pool sizing that matches what was promised.
• Acquirers, during an M&A process — the cap table, run through an exit waterfall, determines exactly how the purchase price splits across every holder, including which preferred series get paid first.
• Prospective employees, evaluating an offer — a candidate comparing two job offers with equity components needs your fully diluted share count to work out what a percentage-based grant is actually worth.
• Auditors and your own board — confirming that option grants, forfeitures, and conversions have been recorded correctly and match what's been reported for tax and accounting purposes.

Each of these audiences will ask for the fully diluted view, not the issued-shares view, because that's the number that reflects economic reality once every promised security is accounted for.

Why ownership percentage changes over time

A founder's percentage on day one and their percentage three years later are almost never the same number, and that's true even if they never sell a single share. Two mechanisms drive nearly all of it.

New funding rounds

Every priced round issues new shares to new investors. The pie doesn't shrink for anyone in absolute terms — the company is worth more, and existing holders still hold the same number of shares — but everyone's slice of the now-larger pie gets smaller in percentage terms. That's ordinary dilution, not a sign anything went wrong. Understanding equity dilution goes through the arithmetic in full, so you can see exactly why it happens before you agree to a term sheet.

Option pool top-ups

Investors typically want a fresh, unallocated option pool sized as a percentage of the post-money company before they invest — often somewhere between 10% and 20%, depending on how much hiring the round is meant to fund. Creating that pool dilutes existing holders, and the way it's structured in a term sheet — before or after the new money comes in — changes who absorbs the cost. This is one of the most common places founders get a worse deal than they realise, because the effect is quiet compared to a headline valuation number.

We've seen a seed-stage founder walk into a term sheet negotiation focused entirely on the pre-money number, agree to a pre-money option pool without pushing back, and only realise afterwards that the pool alone had cost them close to four percentage points more than a post-money structure would have — on top of the dilution from the round itself. The valuation on the term sheet was exactly what they'd asked for. The cap table after closing told a different story.

Common mistakes founders make reading a cap table

Most cap table disputes and surprises trace back to a handful of recurring errors, not to anything exotic.

• Confusing issued and fully diluted percentages — quoting or accepting a number without checking which denominator it uses, as covered above.
• Forgetting unallocated pool shares still count against everyone — an empty pool slot dilutes existing holders the moment it's created, not just when it's eventually granted.
• Treating unconverted SAFEs as if they don't exist yet — they will convert, usually at the worst possible moment to be surprised by it, which is the next priced round.
• Ignoring vesting cliffs when reading 'shares outstanding' — an unvested founder or employee still shows up in the share count even though they haven't earned those shares yet.
• Assuming ownership percentage predicts exit proceeds — liquidation preferences on preferred stock mean a 10% common stockholder and a 10% preferred stockholder can walk away with very different payouts at the same exit value.
• Letting rounding errors compound across rows — percentages that don't sum to exactly 100% across a large cap table are usually harmless rounding, but on a small table they're often a sign a row was duplicated or dropped somewhere along the way.

That last point is the one that catches founders out most at exit — the same percentage on paper very often doesn't mean the same cheque, once liquidation preferences and seniority are applied.

Keeping a cap table accurate as a startup

For a two-person company with no outside money, a spreadsheet is genuinely fine. The moment you add an investor, an option pool, or more than one class of stock, the risk of a formula error creeping in rises fast — and a wrong cap table doesn't announce itself, it just quietly produces the wrong number every time someone asks. Standard governance guidance from bodies like the NACD on board oversight, and startup-specific resources such as Y Combinator and Cooley GO, consistently point to keeping ownership records accurate and current as basic hygiene long before diligence ever begins — not a task to catch up on right before a raise.

A cap table for startups doesn't need to be elaborate to be trustworthy — it needs to be current, correctly show fully diluted figures alongside issued ones, and be the single place everyone actually checks rather than one of several conflicting spreadsheets floating around different inboxes. The moment two people are updating ownership records independently, you no longer have one cap table — you have two, and they will eventually disagree.

Update the table whenever an ownership-changing event happens: a new grant, a departure with unvested shares forfeited, a round closing, or a SAFE converting. Review it at least quarterly regardless, since vesting alone shifts the fully diluted picture even when nothing else has happened. If you want a step-by-step walkthrough of building one from scratch with real numbers, see our cap table template and example post — it's the natural next read after this one.

Build yours now

A cap table you don't trust is worse than useless — it gives you false confidence right up until a term sheet, an acquisition offer, or an investor's diligence request proves it wrong. Foundily's cap table calculator models fully diluted ownership, option pools, and SAFE conversions correctly, for free, so you can check your numbers before they matter rather than after.