Also called: Pre-money Simple Agreement for Future Equity
TL;DR
The original (2013) SAFE variant where the valuation cap was computed on a pre-money basis, sharing dilution across SAFE holders.
In a pre-money SAFE, the cap refers to the company's pre-money valuation. When multiple pre-money SAFEs convert at the same priced round, they collectively dilute the founders, but they also dilute each other, which means an early SAFE holder's final ownership percentage shrinks as more SAFEs are added.
The pre-money SAFE was retired in 2018 in favor of the post-money SAFE, but a meaningful number of legacy SAFEs are still on cap tables and need to be modeled correctly.
Pre-Money SAFE Ownership % ≈ SAFE Investment ÷ (Cap + Sum of Other Pre-Money SAFEs)
Unlike post-money SAFEs, pre-money SAFEs dilute each other, stack 4 pre-money SAFEs and you can give up materially more than expected.
$1M pre-money SAFE at $10M cap. If three other $1M pre-money SAFEs convert at the same time, the cap effectively expands and each SAFE holder ends up with ~8.3% (not 10%), a common founder surprise.
Rarely surfaces in deck content; matters for cap-table modeling and investor diligence.
Y Combinator's Simple Agreement for Future Equity, a contract that gives an investor the right to equity in a future priced round, with no debt or interest.
The 2018 YC SAFE variant where the valuation cap is computed on a post-money basis, making the investor's ownership share predictable.
The maximum company valuation at which a SAFE or convertible note will convert into equity, protecting early investors from dilution at high prices.
The reduction in an existing shareholder's ownership percentage caused by issuing new shares in a financing or an option grant.
The agreed-upon value of the company immediately before a new investment round closes, pre-money + new money = post-money.
Long-form deep dives on the slides Pre-Money SAFE most often shows up on.
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