Fully-diluted shares is the share count that assumes everything convertible has converted and everything promised has been issued: outstanding shares, plus all granted options and warrants, plus shares issuable under convertible instruments (SAFEs, convertible notes) on an as-converted basis, plus — by market convention — the entire ESOP pool, including the unallocated portion. It is the denominator that matters: price per share in a priced round is the pre-money valuation divided by fully-diluted shares, so every instrument added to the count lowers the price per share and shifts dilution onto existing holders.
That is why the two recurring fights in term sheets are denominator fights. First, the option-pool shuffle: investors typically require the post-round ESOP pool (often 10–15%) to be created or topped up pre-money, which pushes the pool’s dilution entirely onto the founders rather than sharing it with the new money. Second, SAFE/note conversion: post-money SAFEs fix the SAFE holders’ percentage and stack their dilution onto founders before the new round is even priced — founders who signed several SAFEs without modelling the fully-diluted table routinely discover at the priced round that they own meaningfully less than they assumed.
Turkish cap tables
The concept maps to Turkish companies with two local wrinkles. ESOPs are frequently implemented as phantom/virtual schemes (contractual payment rights rather than issued shares) because share-based plans are mechanically heavy in an anonim şirket; investors nonetheless insist phantom units be counted in the fully-diluted denominator, since they claim the same economics at exit. And under the registered capital (kayıtlı sermaye) system, board-authorised headroom for future issuances exists but unexercised headroom is not part of the fully-diluted count — only committed instruments are. A clean, instrument-by-instrument fully-diluted table is the single most useful artefact a founder can maintain between rounds.
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