A cap table, short for capitalization table, is the record of who owns what percentage of a company: every founder, investor, and employee equity grant, and how each round of funding changes those percentages.
At formation, a cap table is simple: founders and maybe an early advisor or two. It gets complicated fast once SAFEs, convertible notes, an option pool, and multiple priced rounds stack on top of each other, each with its own conversion terms. A clean cap table shows not just today's ownership but what happens to it under different scenarios: the next round, an acquisition, a down round.
This is also where "fully diluted" ownership comes in. That's the real percentage once every outstanding SAFE, note, and unissued option-pool share is accounted for, not just the shares actually issued today. A founder who only tracks issued shares is usually looking at a number meaningfully higher than their real, fully diluted stake.
A messy cap table is one of the most common things that slows down a raise or an exit, because it's the first document real diligence asks for. Spreadsheet errors, unsigned option grants, and SAFEs nobody remembers the exact terms of turn a routine request into a multi-week scramble. A company raising $1.5M on an $8.5M pre-money valuation ends up at a $10M post-money valuation, with new investors owning 15%. Simple math, as long as the cap table underneath it is actually accurate.
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