The Slow Theft of Your Startup
A cap table, short for capitalisation table, is a document that records who owns what in a company. It
A cap table, short for capitalisation table, is a document that records who owns what in a company. It lists every shareholder, the type of equity they hold, how many shares they have, and what percentage of the company that represents on a fully diluted basis. At the moment a startup is incorporated, it fits on half a page. By the time a company has raised a Series B, hired fifty employees, issued options, and converted a handful of SAFE notes, it has become one of the most consequential legal documents the founders own, and frequently one they do not fully understand until something goes wrong.
The cap table is not just a record. Every time a founder raises money, creates an option pool, or issues equity to an advisor, the cap table rewrites itself, and everyone on it gets a slightly smaller slice. That process is called dilution. Most founders know dilution exists in the abstract. Fewer grasp what it actually costs them by the time they reach an exit.
What a Cap Table Contains
A cap table tracks equity across four main groups: founders, investors, employees, and convertible security holders. Founders typically hold common stock, issued at incorporation. Investors receive preferred stock, which comes with rights that common stock does not have, including liquidation preferences that determine who gets paid first in an exit. Employees receive stock options, usually vesting over four years with a one-year cliff, meaning they receive nothing if they leave before twelve months and earn the rest gradually after that. Convertible security holders, those who invested via SAFE notes or convertible notes, sit in a kind of waiting room on the cap table, their instruments not yet converted into actual equity until a priced round triggers the conversion.
The number that matters most is ownership on a fully diluted basis. Fully diluted means counting every share that exists or could exist: outstanding shares, all options whether vested or not, all unallocated options in the pool, and all convertible instruments as if they had already converted. Founders sometimes make the mistake of calculating their ownership based on shares currently outstanding, which produces a flattering but misleading number. Fully diluted is the only figure that accurately reflects what you will actually own at exit.
How Ownership Erodes Round by Round
Carta, which manages cap tables for more than 45,000 startups, published its Founder Ownership Report in 2026 using data from companies incorporated between 2021 and 2025.
The median founding team retains approximately 56 percent of their fully diluted equity after raising a seed round.
By Series A, that figure falls to 36 percent. By Series B it is 23 percent. By Series D, founders collectively hold just 11.4 percent of the company they started.
Carta’s data also shows the crossover point: investors surpass founders in combined ownership somewhere between Series A and Series B. At Series C, the median employee equity pool at 16.8 percent actually outstrips the median founder ownership of 16.1 percent. The founders of a Series C company own less of their business than the collective option pool they have issued to hire people.
A smaller percentage of a larger, better-funded company can be worth far more than a larger percentage of a company that never grew. The problem is when founders reach a significant exit and discover that liquidation preferences, anti-dilution clauses, and option pool mechanics have reduced their actual payout to a fraction of what the headline ownership percentage suggested.
The Option Pool Shuffle
One of the least understood mechanics on a cap table is the option pool, and specifically when it is created relative to a funding round. Investors typically require a 10 to 15 percent option pool to be established before they invest. The distinction between creating that pool before the investment, known as pre-money, versus after it, known as post-money, sounds technical but has a direct and meaningful impact on how much founders are diluted.
When the option pool is created pre-money, the founders bear the entire cost of it. Their ownership shrinks before the investor’s money even arrives. When it is created post-money, the dilution is shared between founders and the new investor. Investors almost always push for pre-money pool creation precisely because it protects their ownership percentage. According to data cited by Promise Legal, a startup law firm, a founder who fails to negotiate this point can end up diluted by several additional percentage points before the round even closes.
Peter Walker, who runs the Insights team at Carta, noted in the firm’s 2026 report that the dilution environment has actually improved over the past five years. Median seed dilution fell from 23 percent in 2019 to around 19 to 20 percent in recent years, meaning founders today are generally giving away a smaller slice per round than their predecessors did. In hot sectors like AI, founders with strong traction can sometimes negotiate even more favourable terms.
What Goes Wrong
The most common cap table mistakes are the predictable consequences of moving fast without reading the documents that will matter enormously later.
Handshake equity deals made early, with co-founders, early employees, or advisors, that are never formalised in legal documents create genuine ownership disputes at exactly the moment when the company is worth something. A co-founder who contributed early work and left without a formal agreement may have a claim that surfaces during due diligence. About 24 percent of two-person VC-backed founding teams have lost a co-founder by their fourth year, according to Carta. Without proper vesting schedules in place from the start, those departures can leave departed founders holding equity they never earned.
SAFE notes and convertible notes that are not tracked carefully produce cap table surprises at the moment they convert. A founder who raised a seed round on SAFEs with aggressive valuation caps and then raises a priced Series A at a much higher valuation will find at conversion that the SAFE investors receive far more shares than expected, because the cap protects them from the higher valuation. The resulting dilution can push founder ownership several percentage points below what they had planned for, before the new investor’s money even lands.
Using undiluted share counts rather than fully diluted counts when presenting ownership to investors is a mistake that surfaces in due diligence. Investors and their lawyers will always calculate on a fully diluted basis. Presenting anything else creates a credibility problem that is entirely avoidable.
Why It Matters Before You Sign
The cap table accumulates decisions made under pressure: a SAFE note issued at 3 a.m. before a wire deadline, an option pool size agreed to without modelling the downstream impact, a liquidation preference accepted because the valuation number looked good. Each of those decisions is small in isolation. Collectively they determine who gets paid what at exit, and in what order.
Most founders encounter their cap table’s full consequences for the first time when it is too late to renegotiate any of it. The document is not complicated. But it rewards the founders who read it carefully before they sign, not the ones who read it carefully afterwards.
Sources:
- Carta: Founder Ownership Report 2026
- Carta: Dilution Is on the Decline
- Carta: A Shift Is Underway in How Startup Co-Founders Split Their Equity
- Promise Legal: Cap Table Basics: Understanding Startup Equity and Ownership
- SaaStr: The Real State of Seed Today: The Top 10 Learnings from 50,000 Startups
