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You raised on SAFEs. The round is closing. Now your lawyers are telling you the conversion math is more complicated than you expected. You are not alone. We see this at Fellow every month: founders who issued SAFEs early, never modeled the conversion, and are now staring at share counts they did not anticipate.
SAFEs are designed to be simple at signing. The complexity shows up later, at conversion. This post breaks down exactly how SAFEs convert at a priced round, where founders get surprised, and what to do about it.
Post-money vs. pre-money: the difference that changes everything
The most important distinction in SAFE mechanics is whether the SAFE uses a post-money or pre-money valuation cap. The current industry standard is the post-money SAFE (the YC standard form). But many founders still do not fully understand what "post-money" means in this context.
Post-money SAFE: The valuation cap includes all converting securities (other SAFEs, convertible notes) and the option pool. Each SAFE holder knows exactly what percentage of the company they are buying at the time of investment. The denominator is fixed.
Pre-money SAFE: The valuation cap excludes other converting securities. The more SAFEs the company issues, the more each prior SAFE holder's percentage shrinks. Founders and SAFE holders dilute each other in unpredictable ways.
Example: A $1M SAFE at a $10M post-money cap gives the investor exactly 10% at conversion (before the new round dilutes everyone). With a pre-money SAFE at the same cap, that percentage shifts depending on how many other SAFEs are outstanding.
This is why Fellow always recommends post-money SAFEs. The math is cleaner, the ownership is predictable, and sophisticated investors expect it.
The conversion math, step by step
When a priced round closes, every outstanding SAFE converts into shares. Here is how the math works for a post-money SAFE with a valuation cap:
Conversion Price = Valuation Cap / Company Capitalization
Shares Issued = Investment Amount / Conversion Price
"Company Capitalization" under a post-money SAFE includes all issued and outstanding shares, all converting securities (other SAFEs and notes), all issued and promised options, and the unissued option pool.
If the SAFE has both a cap and a discount, the investor gets whichever produces more shares. A common misconception is that the discount only matters when the pre-money valuation exceeds the cap. In fact, the discount can produce more shares even at valuations below the cap. The crossover point is: Pre-Money Valuation = Cap / (1 - Discount Rate). If your cap is $10M with a 20% discount, the crossover is $12.5M. Below that, the discount wins.
Shadow series: what SAFE holders actually receive
SAFE holders do not receive the same stock as new investors. Instead, they receive "Safe Preferred Stock," sometimes called a shadow series or sub-series (e.g., Series Seed-1, Series A-1).
Shadow series shares have the same rights, privileges, preferences, and restrictions as the preferred stock issued to new investors, with one key difference: price-based preferences (liquidation preference, conversion price, dividend basis) are calculated using the SAFE conversion price rather than the price paid by new investors.
In practice, SAFE holders end up with 1x non-participating preferred with a liquidation preference equal to their original investment amount. The economic deal is the same as the new investors, just at a different price per share.
This matters when you are modeling your cap table after conversion. Each shadow series creates a separate line item on the cap table, and each one needs to tie back to signed conversion documents.
Stacking SAFEs at different caps
Many founders issue multiple SAFEs over time at different valuation caps. This is common and fine, but the conversion math gets more involved.
Example:
- $200K SAFE at $4M cap
- $300K SAFE at $8M cap
- $500K SAFE at $10M cap
At conversion, each SAFE converts at its own cap, producing different per-share prices and different share counts. The $4M cap investor gets the most shares per dollar invested. The $10M cap investor gets the fewest.
Each of these creates its own shadow series. That means three separate preferred stock sub-series on your cap table, each with its own conversion price and liquidation preference. If you have not modeled this before the round closes, the post-close cap table can look very different from what you expected.
The five mistakes we see most often
1. Not modeling conversions before signing the term sheet. By the time you see the final share counts, the deal is already done. Run the conversion math before you agree to the priced round terms.
2. Forgetting that the option pool is in the denominator. Post-money SAFEs include the option pool in Company Capitalization. If your option pool increases as part of the priced round (which is common), that changes the conversion math for every outstanding SAFE.
3. Missing board approval. Every SAFE issuance requires board approval. Every conversion requires board approval. Missing consents are one of the most common cap table problems we see at diligence.
4. Leaving conversions unprocessed. The round closed, but the SAFEs are still sitting on the cap table as unconverted instruments. Work with your counsel to process all conversions within two weeks of closing. Every day you wait is another day your cap table does not match reality.
5. Not delivering updated documents to investors. Most investor rights agreements require delivery of an updated cap table after closing. Get this done immediately. It sets the right cadence for ongoing reporting and confirms everyone agrees on the numbers.
The bottom line
SAFEs are simple at signing. They are not simple at conversion. The math is straightforward once you understand it, but founders who wait until closing to model their conversions consistently end up surprised by the results.
If you have SAFEs outstanding and a priced round on the horizon, ask your counsel to run the conversion math now. Not after the term sheet. Not at closing. Now.
Fellow handles SAFE conversions as part of every priced round we close. If you want us to model your conversions, reconcile your cap table, or just sanity-check the numbers before you sign, reach out at fellow.legal.
