Article . Cap table mechanics
Cap table 101 for quantum founders, an 8-minute primer.
The cap table is the most political document a founder owns. It is not accounting, it is a manifest of power signed in shares. This piece is the primer: the building blocks, the 4 principles, 3 scenarios you will hit between pre-seed and seed, and the 3 traps that break deals.
Funds read your cap table as a bill of materials. They want to know who paid in, who controls, who eats first at exit, and which line in the term sheet 5 rounds ago is going to cost the new investor money. Founders read it as a question, how much of this company is still mine, and what does each clause cost me 8 years from now. Both reads are correct. Both happen on the same spreadsheet.
Most founders who walk into pre-seed have never built one. Most founders who walk into seed have one, but it is wrong, or correct on outstanding shares but not on fully diluted, or correct today but not after the SAFEs convert. The math is not hard, but it is unforgiving. A clause that looks like nothing today shows up as a 6-point dilution at the next round, and you cannot undo it.
This is what you need to know before your first call with an institutional investor. Read it in 8 minutes, keep the template open in another tab.
01Building blocks
The vocabulary that matters at pre-seed and seed.
The 5 things you carry into every term sheet
Common stock, the founders class, no preferences.
Preferred stock, what new investors get, with rights attached.
Option pool, the bucket of options promised or reserved for employees.
SAFEs, convertible promises with a cap and a discount, no equity yet.
Fully diluted total, the sum of everything that will eventually be common.
What you can ignore for now
Warrants, dividends cumulated, preferred series stacked seniority, anti-dilution variants. These matter at series A and beyond. At pre-seed and seed you have founders common, an option pool, maybe 2 or 3 SAFEs in flight, and the first priced round coming up. 5 things. Master those, the rest is layering on top.
The one mental model
Think of the cap table as a pie that gets cut into more slices over time, not as a ledger of who put in what cash. The slices are shares, fully diluted. Every new SAFE, every new option, every new round adds slices. The pie size grows when investors put in money, but your slice never grows, it only shrinks. The question is always, by how much.
024 principles
The rules that keep you from signing the wrong term sheet.
Read these slowly
Think in fully diluted, always. Outstanding hides the SAFEs and the pool.
The pool shuffle is a hidden tax. Most term sheets put the pool in the pre-money.
SAFEs are not free. Each one you sign is a known dilution at the next round.
Sanity checks save deals. A cap table that does not sum to 100% is a broken one.
Why these 4, and not 10
These are the 4 that, ignored, cost founders 5 to 15 points of dilution at the seed round. They are not the most subtle rules. They are the ones every quantum founder I have worked with violated at least once before raising. Read them, build them into how you read a term sheet, and you have removed 80 percent of the unforced errors.
A way to remember them
FD always, pool tax, SAFE bill, sum-to-100. 4 words on a sticky note next to your monitor. Every time a term sheet shows up, run them in order. If any answer is not clear, do not sign yet.
033 classic scenarios
3 things you will see between pre-seed and seed, with numbers.
Scenario A . Your first SAFE at $250k, $4M cap, 20% discount.
The setup
You incorporate with 10M founder shares between 3 co-founders, you set up a 2M option pool. Total fully diluted, 12M. An angel writes you a $250k SAFE at a $4M post-money cap and a 20% discount. You sign because the cap is generous and you need the cash. Headline reads founder-friendly.
What actually happens at the next round
6 months later, you raise a $750k Pre-Seed equity round at a $5M pre-money. Round price is computed against fully diluted at the round, which is now 12M plus the SAFE conversion. The SAFE conversion price is the minimum of the cap-based price and the discount price against the round price. At a $5M pre-money the cap-based price binds, the SAFE gets 750k shares, 6 percent of post-money. You diluted 6 percent for $250k. Acceptable. If you had raised at $3M pre-money instead, the discount price would have bound, the SAFE would have taken 9 percent, and you would have asked yourself why.
The lesson
A SAFE is not a fixed cost in equity. It is a range, depending on where the next round prices. Always model it both ways before you sign. Plan for the worst case, not the headline case.
Scenario B . The seed investor wants a 12% post-money pool. Who pays.
The term sheet line
You are negotiating a $3M Seed at $12M pre-money, $15M post-money. The term sheet reads, pre-money of $12M plus a 12% pool post-closing. You read it as, the investor pays for the pool, since the pool is created post-closing. You sign.
The actual mechanic
In 95 percent of US term sheets, the pool is created pre-closing inside the pre-money. Which means the founders absorb the dilution, not the new investor. The math, the new investor wires $3M and gets 20 percent of post-money. The pool is 12 percent of post-money. Founders and prior holders get the remaining 68 percent. Before the pool top-up, you had 85 percent. After, you have 68. You diluted 17 percent on a Seed round where you also paid 20 for the new cash, total 37 points of dilution at a single round. Without the pool clause, total dilution would have been 25.
The negotiation
The right question to ask, in writing in the term sheet, is whether the pool top-up is included in the pre-money or post-money. If pre-money, push to reduce the pool to 9 or 10 percent, or raise the pre-money to compensate. If post-money, the founders save those points without having to fight on the pool size. Most investors will not volunteer this clarification. Ask.
Scenario C . You stack 3 SAFEs at $4M, $5M, $6M caps. They all convert at the round.
The setup
You raise 3 SAFE tranches over 12 months, $150k each, post-money SAFEs at escalating caps. You feel good, each cap is bigger than the last, you are building momentum. Then you raise the Seed.
The compound math
Post-money SAFE math, each holder gets amount divided by cap, of post-money equity. SAFE 1, $150k divided by $4M cap, gets 3.75 percent post-money. SAFE 2, $150k divided by $5M, gets 3 percent. SAFE 3, $150k divided by $6M, gets 2.5 percent. Total SAFE dilution at the round, 9.25 percent post-money. Combined with a 12 percent pool top-up that founders absorb, and a 20 percent new equity round, you took 41 points of dilution at a single moment. The headline read seed at $12M pre-money, the reality is you came out of seed owning roughly 55 percent of the company.
The lesson
Post-money SAFEs do not cannibalize each other the way pre-money SAFEs do. Each one preserves its share of post-money. The founder absorbs all the compounding. 3 post-money SAFEs at low caps can move your seed dilution by 5 to 10 points compared to pre-money SAFEs of the same size. Model the cumulative SAFE conversion before you sign the 3rd one, not after.
043 traps
Where founders lose ground without seeing it.
Trap 1, pre-money vs post-money pool not made explicit
Term sheets read pre-money $X with a Y percent pool. They rarely say pre-closing or post-closing in plain language. Founders read it as post-closing, investors execute it as pre-closing. The 5-point gap shows up at signing, when it is too late to renegotiate without breaking the deal.
Trap 2, post-money SAFE compounding silently
1 post-money SAFE is fine. 3 of them at low caps, signed 12 months apart with no model in between, can take 15 percent of your post-money before the new equity even comes in. Always model the cumulative SAFE math when signing the 2nd SAFE.
Trap 3, discount binding when the round prices below cap
Most SAFE templates do cap-only math. If the round prices below the cap, the discount actually binds, and the SAFE takes more shares than the simple model shows. Often 3 to 5 percent more dilution. If you are pricing a Pre-Seed round under your highest SAFE cap, recompute with discount binding.
05Use the template
Plug your numbers in. 10 minutes to know where you stand.
What is in the free template
3 founders, an option pool, 3 SAFEs, a Pre-Seed equity round with SAFE conversion and pool top-up, a Series A equity round, exit ROI per holder. The math handles SAFE discount-binding, the pool target post-round, the cash matches. Sanity checks built in at the bottom, every percentage stays at 100%. Download it from the workspace cap table surface, replace the placeholder names and amounts, save your version, run it before every term sheet review.
06Where this gets harder
You read the basics. You still have a term sheet on your desk with 2 clauses you can't price out.
When a 30-min call helps
You read this article, you downloaded the template, you plugged your numbers in. Now you have a real term sheet with a 1.5x participating preferred, an anti-dilution clause with broad-based weighted average, and a board seat for the lead investor. You can model the cap table on signing day, but you cannot model what each of those clauses costs you 8 years out at exit. That is where a 30-min call helps. Quantum CFO advisory, calibrated to founders raising pre-seed to series A in quantum computing, sensing, communications, photonics, PQC. No pitch, no sales. We map your raise, who to talk to, in what order, with what story, and what to push back on in the term sheet. Book a call via the workspace.