Cap Table & Option Pool Modeler

The capitalization table — the cap table — is the ledger of who owns your company. It lists every shareholder, every share class, every option, and every convertible instrument, and it shows what each is worth as a percentage of the whole. It is a spreadsheet today. It becomes the law of your company the moment money changes hands.

Founders who treat the cap table as a back-office detail tend to learn its mechanics during a financing, under time pressure, across a negotiating table. That is the worst possible classroom. The numbers move in ways that feel counterintuitive until you have seen them move a few times.

This guide gives you the mental model first, then the math. The interactive modeler beside it lets you change one input and watch the rest respond. Read this once, then go break things in the model. That is how the intuition forms.

Ownership is counted two ways, and the difference matters. Issued shares are what has actually been granted. Fully diluted shares include everything that could become a share — granted options, the unallocated option pool, warrants, and the shares that outstanding SAFEs and notes will convert into. Investors price your company and their stake on the fully diluted number, always. So should you.

Percentages, not share counts, are what you negotiate over. Whether your company has authorized one million shares or ten million is largely cosmetic. What a 9 percent stake represents is real. When someone quotes you a number, ask the same question every time: is that issued or fully diluted? The gap between the two is where surprises live.

Keep one document as the single source of truth, ideally on a platform built for it rather than a spreadsheet that forks every time someone emails a copy. Reconcile it after every grant, every hire, every round.

At incorporation, founders typically issue themselves the bulk of the shares. Sensible practice — and what nearly every investor will require — is to put those founder shares on a vesting schedule. Vesting means you earn your own equity over time by continuing to work in the company. Unvested shares can be repurchased at cost if you leave.

The market-standard schedule is four years with a one-year cliff. Nothing vests for the first twelve months; at the one-year mark, a quarter vests at once; the rest vests monthly over the following three years. The cliff protects the company and your co-founders from a founder who departs in month four still holding a quarter of the business.

This feels strange the first time. You are agreeing to earn shares you already hold. But the logic is sound, and it protects you as much as anyone. If a co-founder walks early, vesting is what stops them from keeping a stake the rest of you have to carry for a decade. Two related items belong on your checklist the same week you sign: a Section 83(b) election filed within thirty days if you are on US restricted stock, and a written, signed schedule for every founder.

To recruit early employees, you grant them stock options — the right to buy shares later at today's price. Those options come from a reserved block of equity called the option pool, or ESOP (employee stock option plan). The pool is carved out of the fully diluted total and sits there, unallocated, until you make grants.

A pool sized between 10 and 20 percent of the fully diluted company is typical heading into and through the early rounds, with the right number driven by how many senior hires you still need to make. A company that needs to hire a VP of Engineering and a head of sales needs more reserved equity than one that has those seats filled.

Creating or topping up the pool dilutes existing shareholders, because new shares are added to the denominator. There is no way around that. The only real questions are how big the pool is and — critically — who absorbs the dilution. That second question is the one investors care about most, and it leads directly to the next section.

Here is the move that surprises most first-time founders. When an investor leads a priced round, they will usually require you to create or expand the option pool as part of the deal — and to do it pre-money. That single word, pre-money, determines who pays for the pool.

If the pool is created pre-money, it comes out of the pre-money valuation, which means existing shareholders — you and your co-founders — absorb all of the dilution from it. The new investor's percentage is calculated after the pool already exists, so they are untouched by it. If the pool were instead created post-money, everyone including the new investor would share the dilution proportionally.

Investors prefer pre-money for a reason that is honest enough: the pool exists to hire the team that grows the company before the next round, so the founders should fund it. That is defensible. What is not defensible is accepting an oversized pool without pushing back. A pool sized at 20 percent when your hiring plan needs 12 is a quiet transfer of several points of ownership from you to the next round's incoming employees — and, indirectly, a better effective price for the investor. Size the pool to a written hiring plan, and negotiate it as hard as you negotiate the valuation. The two are linked.

Two valuations describe a priced round. Pre-money is what your company is worth immediately before the new investment. Post-money is pre-money plus the new money raised. The relationship is the whole of it: post-money equals pre-money plus the amount invested.

The investor's ownership comes from the post-money number. If you raise 4 million dollars on a 16 million dollar pre-money, the post-money is 20 million dollars, and the new investor owns 4 over 20 — 20 percent. Your existing ownership is multiplied by the ratio of pre-money to post-money. In this case every prior shareholder keeps 16 over 20, or 80 percent, of what they held before.

When an investor names a 'valuation,' always confirm which one they mean. The difference between a 16 pre-money and a 16 post-money on a 4 million dollar raise is a four-point swing in your ownership. Modern SAFEs default to post-money, which is cleaner but shifts dilution risk onto founders in a way the older pre-money SAFE did not. Know which you are signing.

Dilution is the reduction in your ownership percentage when new shares are issued. It is not, by itself, a loss. Your slice of the pie shrinks, but a successful round makes the pie larger, and a smaller slice of a much bigger pie is the entire point of venture financing. Founders who optimize to avoid dilution often optimize themselves into a smaller company.

The mechanic is arithmetic. Every new share — investor shares, pool shares, converting SAFEs — increases the fully diluted denominator while your share count stays fixed. Your percentage falls by the same ratio for everyone diluted in that event. A round that issues 20 percent to a new investor reduces every pre-round holder's stake to 80 percent of its former level, uniformly.

What you are managing across a company's life is not whether you dilute, but how much ownership you give up for each dollar and milestone. Give up too much too early at a low valuation and you can arrive at Series A owning too little to stay motivated — or to satisfy the next investor, who wants founders meaningfully invested. The discipline is raising the right amount at the right price, not raising the least.

Numbers below are illustrative — chosen to be round and readable, not to represent any real company or current market terms. Follow the logic, then reproduce it in the modeler with your own figures.

Start at founding. Two founders split the company evenly: 100 percent between them, no pool yet. Then a Seed round. You raise 2 million dollars on a 6 million dollar pre-money, post-money of 8 million, and the investor requires a 10 percent post-round option pool created pre-money. The pool and the new money both dilute the founders; the pool, being pre-money, hits them harder.

After Seed: Seed investors hold 25 percent (2 over 8), the option pool holds 10 percent, and the two founders share the remaining 65 percent — roughly 32.5 percent each. Now Series A. You raise 8 million dollars on a 24 million dollar pre-money, post-money of 32 million, with a pool top-up back to 10 percent of the post-round company folded in pre-money. The Series A investor takes 25 percent, the topped-up pool sits near 10 percent, Seed investors are diluted from 25 to roughly 18.4 percent, and the founders land near 46.6 percent combined.

Early money often arrives before anyone wants to negotiate a valuation. SAFEs (simple agreements for future equity) and convertible notes let you take that money now and convert it to equity later, at the next priced round. A note is debt with interest and a maturity date; a SAFE is not debt and has neither. The SAFE, originated by Y Combinator, has become the default for pre-seed and seed in most markets.

Two terms shape what investors get when they convert. The valuation cap sets the highest valuation at which their money converts, rewarding them for early risk if you grow. The discount gives them a percentage off the next round's price. When a priced round happens, the SAFE converts at whichever of cap or discount is more favorable to the investor.

The trap is forgetting these instruments are real ownership in waiting. They do not appear as issued shares, so an untracked stack of SAFEs makes your cap table look cleaner than it is. At the priced round they all convert at once, and the dilution lands — often larger than founders remember, because it compounds with the new round and a post-money SAFE's mechanics push the conversion dilution onto founders specifically. Model every outstanding SAFE on an as-converted basis before you sign a term sheet, not after.

A pro-rata right gives an investor the option — not the obligation — to invest in your future rounds enough to maintain their ownership percentage. Without it, an early investor is diluted by every subsequent round like everyone else. With it, they can write a check in the next round sized to hold their line.

For you, pro-rata is double-edged. It rewards your early backers and signals confidence when they exercise it, which the next lead reads as a positive. But pro-rata commitments consume room in future rounds — room a new lead investor may want for themselves. A later round can get genuinely tight when several earlier investors all exercise pro-rata and the incoming lead still needs its target ownership.

Grant pro-rata deliberately, usually to your lead and meaningful investors rather than to everyone on the cap table. Track who holds it. When you build the Series A round in the modeler, allocate the pro-rata commitments first and see how much room is left — sometimes the answer reshapes how much you can raise from a new lead.

By the time you reach Series A, your cap table tells a layered story, and reading it fluently is a founder skill worth developing. Read each round as three moves in sequence. First, the option pool is created or topped up — note whether pre- or post-money, because that tells you who paid. Second, outstanding SAFEs and notes convert, expanding the share count. Third, the new investor's shares are issued at the post-money price. Each move dilutes; the order and the pre/post framing determine by how much and for whom.

Hold three percentages in view at all times: founder ownership, total investor ownership, and pool size. Healthy ranges vary by company and sector, but founders dropping below roughly half combined by the end of Series A is a yellow flag worth understanding — it can signal you raised too much too early, or priced rounds too cheaply, and it can complicate later rounds where investors want founders strongly incentivized.

The modeler exists so you can rehearse. Change one input — a higher pre-money, a smaller pool, a SAFE cap moved up or down — and watch every downstream percentage respond. Do this before the negotiation, not during it. Walking in already knowing what each variable does to your ownership is the difference between negotiating and reacting.

Cap table damage is rarely dramatic in the moment. It compounds quietly and surfaces years later — at the next raise or at exit — when it is expensive or impossible to undo. The errors below are the ones we see most, and nearly all are preventable with foresight and a clean record.

None of these require a lawyer to spot in advance, though several require one to fix afterward. Read this list before your first raise, and again before every one after it.

Run this list before you accept a term sheet. If you cannot answer an item cleanly, you are not ready to sign — you are ready to ask one more question. That is the cheaper place to be.

Understanding your cap table is not an accounting chore. It is leverage. The founders who negotiate well are the ones who walk into the room already knowing what every term does to their ownership three rounds out — because they modeled it first, calmly, with no investor watching.

That readiness is the work of the raise-readiness sprint inside our AI Capital Acceleration program: a clean cap table, a defensible valuation, a financial model that holds up, and a data room built for diligence — the preparation that earns better terms before the warm introductions begin. Turnings reward the prepared. So do term sheets.

Use the modeler beside this guide to rehearse your own scenarios. Then, if it would help to have experienced eyes on the structure before you raise, that is a conversation we have often. Tell us where you are, and we will be candid about what comes next.