Founders negotiate valuation because it is the headline number. Investors are usually working from a different one, which is the percentage of the company they will still own when it is sold.
Fund arithmetic sets the target
A venture fund expects most investments to return little and a small number to return everything, so each position has to be large enough to matter if it works.
That requirement translates into a minimum ownership stake, because a small percentage of even a very successful outcome will not move a fund of meaningful size.
The valuation is then whatever makes the cheque and the stake consistent, which is why investors often care more about the size of the round than the price attached to it.
Dilution continues after the round closes
Ownership at the moment of investment is not ownership at exit. Later rounds, option pool expansions and any employee equity granted afterwards all reduce it.
An investor modelling a position assumes several future rounds and works out what remains, which means the entry stake is chosen with those reductions already anticipated.
Founders who focus only on the current round frequently find the cumulative effect over several financings larger than they expected.
The option pool is negotiated as part of price
Where a round requires an expanded option pool for future hiring, the terms usually place that expansion before the investment rather than after.
The practical consequence is that existing shareholders bear the dilution from the pool while the incoming investor does not, which lowers the effective valuation.
Two offers with the same headline number can therefore differ meaningfully depending on how the pool is treated, and the difference sits in the detail rather than the summary.
A high price now raises the bar later
Each round sets an expectation that the next will be higher, and the progress required to justify the next price grows with the last one.
Companies that raise at a valuation ahead of their progress can find the following round difficult even while performing respectably, because they are being measured against the earlier number.
A down round is possible but carries structural consequences through anti-dilution provisions, and the terms attached vary considerably between agreements.
Terms can matter more than price
Liquidation preferences, participation rights and board composition all affect what the founders receive and control, and none appear in the valuation figure.
An offer at a lower valuation with simple terms can be worth more in most outcomes than a higher one with layered preferences attached.
The structures involved are technical enough that founders generally review them with advisers who have seen many of them, since a term that has never been triggered still governs what happens if it is.