Fundraising
The Option Pool Shuffle: How a 15% Pool Turns a $20M Pre-Money Into $16.25M
A pre-money option pool quietly cuts your real pre-money valuation and resets the 409A strike price your next hires pay. Here is the math, run both ways.
By 409.AI Team - 2026-09-08
# The Option Pool Shuffle: How a 15% Pool Turns a $20M Pre-Money Into $16.25M
The term sheet says twenty million pre-money, five million in. You do the obvious arithmetic, decide the new investor is taking 20%, and forward it to your co-founder with a one-word message. Then counsel sends back a redline with a single sentence highlighted, and the number you've been celebrating stops being the number.
The sentence usually reads close to this: the company will reserve an unallocated option pool equal to 15% of the post-closing fully diluted capitalization, and that pool will be included in the pre-money capitalization. Two clauses. The first sets the size of the pool. The second decides who pays for it. Founders spend weeks negotiating the first and about four minutes on the second, which is backwards, because the second one is worth more.
Where the money actually goes
Take a company with 10 million shares outstanding on a fully diluted basis before the round. Eight million belong to the two founders. The other two million cover early employees and grants already made. Now add the Series A: $20 million pre-money, $5 million of new capital, and a 15% unallocated pool measured against the post-closing cap table.
Because the pool sits in the pre-money, the post-closing ownership splits three ways before anyone issues a share. The investor takes 20%. The new pool takes 15%. Everyone who was already there splits the remaining 65%. That 65% has to accommodate the existing 10 million shares, so the post-closing total is 10,000,000 divided by 0.65, or 15,384,615 shares. The investor buys 3,076,923 of them. The pool reserves 2,307,692.
Price per share falls out of that: $5,000,000 divided by 3,076,923 shares is $1.625. Check it against the pre-money and the answer holds. Your $20 million pre-money is being divided by 12,307,692 shares, which is your existing 10 million plus the 2.3 million pool shares that don't exist yet and belong to nobody.
Here's the part worth sitting with. Your existing shareholders own 10 million shares at $1.625, which is $16,250,000. Not $20 million. The pool absorbed $3,750,000 of the headline pre-money before the wire cleared, and the people who funded it are the ones who were already on the cap table.
The same round, priced the other way
Put the pool after the money instead and the arithmetic changes at the first step. The $20 million pre-money is divided by the actual 10 million shares, so the price is $2.00. The investor's $5 million buys 2.5 million shares out of 12.5 million post-closing, which is exactly 20%.
Then create the 15% pool on top. That takes 2,205,882 new shares and brings the total to 14,705,882. The founders' 8 million shares are now 54.4% of the company. The investor lands at 17.0%.
Compare that to the pre-money version, where the founders came out at 52.0% and the investor at 20%. The gap is 2.4 points of founder ownership and 3 points for the investor, and it exists entirely because of clause placement. Nobody changed the valuation, the raise amount, or the pool size.
That gap isn't fixed. It widens as the pool gets bigger and narrows as the round gets larger relative to the pre-money. A 20% pool on a small seed extension does considerably more damage than a 10% pool on a $200 million Series C. Model your own numbers rather than trusting a rule of thumb, including someone else's rule of thumb about how bad this is.
Pool sizes themselves have stayed fairly stable. [HSBC Innovation Banking's review of term sheet data](https://www.hsbcinnovationbanking.com/hk/en/resources/understanding-employee-option-pools) puts the common range at 10% to 15%, with 10% the single most frequent choice, and finds a pool creation or top-up mentioned in 71% of term sheets. So this clause shows up in roughly three of every four rounds you'll ever sign.
It's also worth knowing this isn't a distressed-market term. [Cooley's Q1 2026 venture financing report](https://www.cooley.com/news/insight/2026/2026-04-29-q1-2026-venture-financing-report) put up rounds at 86% of deals, with 1x nonparticipating preferred still standard in the overwhelming majority. Pool expansion is a term founders sign in good markets, from a position of strength, which is exactly why it slips through. Nobody scrutinizes the fine print on a round they're happy about.
What it does to your 409A
This is the part that gets skipped, and it's the part that touches every employee you hire with the pool you just paid for.
The price you just set is the most important input into your next valuation. When an appraiser runs a backsolve, they solve for the total equity value that reproduces the observed price of the new preferred, then allocate that value down the stack to common. We've written about [how OPM, PWERM, and the backsolve turn one round price into a common stock strike price](https://www.409.ai/articles/409a-allocation-methods-opm-pwerm-backsolve), and about [why the resulting number lands well below your post-money](https://www.409.ai/articles/why-is-your-409a-valuation-lower-than-post-money-valuation). The short version: the round price is the anchor, and the preference stack and marketability discount pull common down from there.
Which produces a result most founders don't expect. Negotiate the pool from 15% down to 5% and the post-closing total becomes 13,333,333 shares, the investor buys 2,666,667, and the price per share climbs to $1.875. You kept 60% instead of 52%, which is a genuine win. You also raised the anchor price by 15%, and a higher anchor generally produces a higher indicated common value, all else equal. The strike price your next twenty hires pay went up because you fought for your own ownership.
That isn't an argument for a bloated pool. It's an argument for knowing what you're trading. A smaller pool moves value from future employees to current shareholders, and a larger pool does the reverse. Both are defensible. Pretending the trade doesn't exist is not.
There's a second, quieter effect. Those 2.3 million unallocated shares sit in the fully diluted count and receive an allocation of value even though no one holds them. Practice varies on how appraisers model unissued reserves, with some treating them as common equivalents and others as options struck at an assumed future exercise price. The difference is usually second order next to your liquidation preferences, but it's worth one question to your appraiser rather than an assumption. If your preference stack is unusual, [the waterfall itself deserves a closer look](https://www.409.ai/articles/liquidation-preferences-waterfall-common-stock-exit) before you worry about the pool.
The timing mismatch nobody prices
Founders pay for the pool at closing. Employees receive grants out of it over the following twelve to eighteen months, at whatever the 409A says on each grant date.
Suppose your post-round 409A lands at $0.60 per common share. Eighteen months later the company has grown and the next appraisal comes in at $1.10. A senior engineer hired in month sixteen gets 100,000 options at a $1.10 strike. At a $6.00 exit, that grant is worth $490,000 of spread rather than the $540,000 it would have carried at the earlier strike. The dilution that funded her grant was charged to the founders at Series A prices. Her strike was set at month sixteen prices. The pool doesn't buy as much recruiting power as the founders paid for, and the bigger the gap between closing and hiring, the wider that wedge gets.
The financing itself is what forces the new appraisal. Under the independent appraisal presumption in [Treas. Reg. § 1.409A-1(b)(5)(iv)(B)](https://www.law.cornell.edu/cfr/text/26/1.409A-1), a valuation carries its presumption of reasonableness for up to twelve months, and only until information arrives that would materially affect value. A priced round is exactly that kind of information, which is why the [trigger events matter more than the calendar](https://www.409.ai/articles/409a-valuation-frequency-how-often-should-you-get-one). Grant options off a stale pre-round number and you're pricing equity against a valuation the IRS no longer presumes reasonable.
One more piece of housekeeping while the pool is fresh: the shares need a board-approved plan behind them, and grants out of that plan generally rely on the SEC's compensatory exemption, which carries [its own disclosure thresholds under Rule 701](https://www.409.ai/articles/rule-701-startup-equity-compensation-disclosure).
Negotiating the clause
Placement is close to settled market practice in US venture deals, so burning your negotiating capital on moving the pool to the post-money usually wastes it. Spend it on the size instead.
Build a bottom-up hiring plan covering the next twelve to eighteen months, not three years. Name the roles, attach a share number to each one rather than a percentage, add a buffer for refresh grants to people already on the team, and total it. If the plan says 8%, take 8% to the negotiation with the plan attached. Investors ask for 15% because the alternative is guessing, and a credible plan is much harder to argue with than a counteroffer.
Then ask your counsel to model the cap table both ways and show you the two price-per-share numbers before you sign. It takes an hour. In the example above it was worth $3.75 million of nominal pre-money and 2.4 points of founder ownership, which is a better hourly rate than almost anything else you'll do that week.
And model the round the way it will actually close. If you have SAFEs or notes converting into this round, they change the share count the pool percentage is applied to, which changes the price, which changes everything downstream. We've covered [how SAFEs land in a priced round](https://www.409.ai/articles/how-safes-affect-your-409a-valuation) and [what converting notes do to the same math](https://www.409.ai/articles/convertible-notes-effect-on-409a-valuation) in more detail.
The option pool line is a valuation term wearing an HR costume. It sets your price per share, it sets your ownership, and it sets the strike price for every person you hire with it. Read it like the valuation term it is, and when the round closes, get the [409A that follows it](https://www.409.ai/products/409a) done against the cap table you actually signed rather than the one in the deck.
Sources
- [Treas. Reg. § 1.409A-1, Cornell Legal Information Institute](https://www.law.cornell.edu/cfr/text/26/1.409A-1)
- [Cooley Q1 2026 Venture Financing Report](https://www.cooley.com/news/insight/2026/2026-04-29-q1-2026-venture-financing-report)
- [HSBC Innovation Banking, Understanding employee option pools](https://www.hsbcinnovationbanking.com/hk/en/resources/understanding-employee-option-pools)