Pre-Money Valuation Explained: What a New Round Does to Your Equity
Pre-money is the value before new cash, post-money adds the investment, and your dilution comes from the investor's share of post-money.
You are looking at a priced round, where the company and investors agree on a value, and the first number is pre-money. The trap is treating that number as the company's final worth. The rule is that pre-money is the value before new cash, post-money is pre-money plus the investment, and the investor's stake is new cash divided by post-money.
For a founder or employee with equity, that equation is the whole point. It tells you how much of the old pie survives the new cash. It also tells you why a company can raise at a higher valuation while your percentage still falls, even when the company's value is moving in your favor.
The math is simple, but the labels are where people get lost.
Write the three numbers on a whiteboard: pre-money, new cash, and post-money. Then you can see which one changes your stake.
Pre-money shows the old company, not your stake
Pre-money is the price the company had before the new investor's money arrived. It helps you spot how much the company's value moved since the last round. It does not directly state your stake.
The catch is that it can make a round look smaller than the ownership change. A high pre-money can flatter the company while still leaving you with a smaller percentage after the new shares are issued. So a founder may celebrate the headline while an employee should check the denominator.
Post-money shows the investor's slice
Post-money is the total after the new cash arrives. The denominator decides how big the investor's stake becomes. If the investor's cash is a small part of post-money, the investor owns that same small part.
That same denominator also sets your new stake. Your new percentage is your old percentage multiplied by pre-money divided by post-money. A smaller percentage of a much larger company can still be worth more, but the percentage alone does not prove that. You need the post-money number to test whether the larger company is large enough to offset the smaller percentage.
A recent round shows how fast the denominator can move
Cognition had closed a $400 million funding round at a $10.2 billion post-money valuation eight months before its new round.
Cognition said its new investment exceeded $1 billion and valued the company at $25 billion before the investment and $26 billion after it. The jump from the earlier post-money number to the new post-money number shows why the denominator can change quickly.
Cognition's new round had Lux Capital, General Catalyst, and 8VC as lead investors.
Cognition reported a $492 million annualized revenue run-rate, or the revenue pace if the current month continued, and said Devin's enterprise usage grew 50% month-over-month, or from one month to the next, over the previous six months.
Bloomberg reported that SpaceX, Elon Musk's company, tried to buy Cognition.
Cognition CEO Scott Wu posted on X that Cognition is not for sale and that the companies have not been in talks.
Bloomberg reported that Cognition is in early discussions about a new funding round at a $40 billion valuation.
The labels matter because the same cash can look different in each number. Check the math before you sign.
Your percentage is the number you keep
If pre-money is the only figure you get, treat that as a warning. It is the figure that makes the round sound good. Ask for the missing pieces before you judge your stake, especially when the headline valuation is the only number in the room.
- Post-money valuation
- New cash being raised
- Your old percentage
If you are deciding whether to exercise options, accept a new grant, or talk to the board, ask for the post-money number and the investor's cash. Then run the math on your old stake. The answer comes from the denominator, not the headline.
