You joined a Series A startup two years ago with 0.08% of the company. The equity portal just updated, and your ownership now shows 0.055%. Your gut reaction: “I just lost a third of my equity.”
But here is what actually happened. The company raised a Series C, and the valuation went from $200 million to $800 million. Your shares were worth $160,000 on paper before the round. Now they are worth $440,000. You got diluted and got significantly richer at the same time.
This is the core confusion around startup equity dilution. Your percentage shrinks, but that percentage is a slice of a much bigger pie. The question is not whether dilution happens. It always does. The question is whether you are getting wealthier or poorer when it does.
How Dilution Actually Shows Up
Dilution happens when a startup issues new shares. Those shares usually go to new investors, and sometimes the company also expands the option pool to hire more people later. That increases the total number of shares outstanding, which means your ownership percentage goes down.
Your share count usually does not change. If you were granted 20,000 options, you still have 20,000 options. What changes is the denominator. The pie gets bigger, so your slice becomes a smaller percentage of the whole.
That is why an equity portal update can feel worse than it really is. You log in, see your ownership drop from 0.08% to 0.055%, and assume you lost equity. Usually, you did not lose shares. The company just issued more of them.
The math that matters is simple: your paper value equals your ownership percentage multiplied by the company’s valuation. In a funding round, both numbers usually move at the same time. Your percentage drops, but the valuation often rises. What matters is the net result.
Hypothetical example:
You own 0.1% of a company valued at $100 million. Your shares are worth $100,000 on paper. The company raises a Series B at a $400 million valuation, and your ownership drops to 0.075% because new shares were issued. Your new paper value is $300,000. You got diluted by 25%, but your equity value still tripled.
That is the part many people miss. A lower percentage does not automatically mean less money. It can mean exactly the opposite.
This is not a trick. It is how dilution works when a company is growing. The percentage drop is the cost of raising capital. If that capital helps the company grow fast enough, you can end up with a smaller slice of something much more valuable.
The Dilution Pattern Across Rounds
Dilution is not a one-time event. It happens with every funding round, and the pattern is fairly predictable.
Series A rounds typically dilute existing equity holders by 15% to 25%. Series B and C rounds usually fall in the same range, though the percentage dilution per dollar raised tends to drop as the company gets bigger. That is because the valuation base is larger, so the same amount of capital represents a smaller percentage of the total.
Here is what a typical journey might look like for an employee who joins at Series A and stays through multiple rounds.
Grant at Series A at a $200 million valuation
Ownership: 0.080%
Paper value: $160,000Series B at a $400 million valuation
Ownership: 0.064%
Paper value: $256,000Series C at an $800 million valuation
Ownership: 0.052%
Paper value: $416,000Series D at a $1.2 billion valuation
Ownership: 0.045%
Paper value: $540,000
Your ownership percentage drops by roughly 20% with each round in this example, but your paper value more than triples from grant to Series D. The dilution happens, but the growth in valuation more than offsets it.
The absolute dollar swings get bigger in later rounds even though the percentage dilution gets smaller. A 15% dilution at a $1 billion valuation moves your paper value by $150,000 or more if the round prices up. A 25% dilution at a $200 million valuation moves it by $40,000. The stakes grow as the company scales.
This pattern holds as long as the company keeps growing and raising at higher valuations. When that stops, the math changes completely.
When Dilution Actually Hurts
Dilution makes you poorer in two situations: flat rounds and down rounds.
A flat round is when the company raises money at the same valuation as the last round. You still get diluted because new shares are issued, but the valuation does not go up to offset it. Your percentage drops and your absolute value drops with it.
Hypothetical example:
You own 0.08% of a $200 million company, worth $160,000 on paper. The company raises a new round at a $200 million post-money valuation and issues 25% new shares. Your ownership drops to 0.06%, and your paper value falls to $120,000. You just lost $40,000 in equity value because the company had to give up a bigger piece of itself without growing.
A down round is worse. That is when the company raises at a lower valuation than the previous round. The dilution happens, and the valuation drops, so you get hit twice. Employees who joined at the peak valuation can see their equity lose 50% or more of its paper value in a single down round.
The difference between good dilution and bad dilution is not the percentage. It is what happens to the valuation.
Hypothetical example:
Good dilution: 3x valuation increase, 20% dilution
Before: 0.08% ownership in a $200 million company = $160,000 paper value
After: 0.064% ownership in a $600 million company = $384,000 paper value
Net change: 2.4x increase in valueBad dilution: flat valuation, 25% dilution
Before: 0.08% ownership in a $200 million company = $160,000 paper value
After: 0.06% ownership in a $200 million company = $120,000 paper value
Net change: 25% drop in value
Good dilution is the cost of growth. Bad dilution is the cost of survival. When a company raises money without growing the business, it is trading equity for runway, and that trade dilutes everyone without creating new value.
Comparing Offers When Dilution Is Coming
Dilution also matters when you are comparing job offers, especially if both companies are planning to raise another round soon.
Say you have two offers. Company A offers 0.15% at a $100 million valuation. Company B offers 0.08% at a $300 million valuation. On day one, Company A gives you $150,000 in paper value, and Company B gives you $240,000.
But both companies are raising again in 12 to 18 months. If Company A raises at a $300 million valuation and dilutes you by 20%, your equity becomes 0.12% worth $360,000. If Company B raises at a $450 million valuation with 20% dilution, your equity becomes 0.064% worth $288,000.
In this scenario, the lower percentage at the higher valuation still wins after one round, but the gap narrows. The company with more room to grow in valuation can close the difference or flip the outcome entirely.
This is why you cannot compare offers on percentage alone. You need to think about where each company is in its funding trajectory, how much dilution is likely before an exit, and what kind of valuation growth is realistic given the stage and market.
Dilution Mistakes That Can Cost You
1. Panicking over percentage drops without checking valuation.
You see your ownership fall from 0.1% to 0.07% and assume you lost 30% of your equity. But if the valuation tripled, you actually gained $280,000 in paper value. Quitting over a percentage drop without doing the math can cost you six figures.
2. Comparing job offers on percentage alone.
A 0.2% grant at a $20 million seed-stage company is worth $40,000 on paper. A 0.05% grant at a $500 million Series C company is worth $250,000. The smaller percentage is the bigger grant, and it will likely dilute less before exit because the company is further along.
3. Ignoring the difference between good dilution and bad dilution.
If your company raises at a flat or down valuation, the dilution is not the normal cost of growth. It is a sign that the business is not scaling the way investors expected, and your equity value is taking a real hit. That is a different situation than getting diluted in a round that prices up 3x.
4. Assuming dilution stops after the next round.
If the company is still private and still growing, more funding rounds are coming. Each one will dilute you again. Your equity value depends on the cumulative effect of all those rounds, not just the next one. A company that raises five rounds before exit can dilute early employees by 50% to 70% and still make them wealthy if the valuation grows enough.
5. Leaving equity unexercised and watching it dilute further.
If you leave the company without exercising your vested options, your ownership percentage can continue to shrink as the company raises more rounds and expands the option pool. Exercised shares are locked in. Unexercised options are just a right to buy shares at a fixed price, and that right does not protect you from future dilution of the percentage those shares represent.
6. Misreading equity portal language as a loss.
The notice that says “your ownership has been adjusted” is not telling you that you lost equity. It is telling you that the pie got bigger. If you owned shares before the round, you still own the same number of shares. The company just issued more shares to other people.
Bottom Line
It is worth checking what your current paper value is after the most recent funding round, not just your ownership percentage. Multiply your percentage by the post-money valuation to see whether you are actually richer or poorer than you were before the round.
A good starting point is asking your company how much dilution typically happens per round and how many more rounds they expect before an exit. That gives you a rough sense of how much your percentage will shrink and whether the valuation growth is likely to offset it.
It is worth looking at how much of your equity is vested and whether you plan to exercise your options if you leave. Unexercised options can lose value through dilution even after you are no longer an employee, and the tax cost of exercising can be significant if the company has grown.
If you are comparing offers, it is worth modeling what happens to each grant after one or two more funding rounds. Use realistic dilution assumptions, like 20% per round, and realistic valuation growth based on the company’s stage and market. The offer with the higher percentage today is not always the offer with the higher value at exit.
It is worth understanding whether the company is raising because it is growing or because it is struggling. Dilution in a growth round makes you richer. Dilution in a survival round makes you poorer. The percentage drop looks the same, but the outcome is completely different.
Have you been through a dilution event that surprised you? Or are you trying to figure out how to compare equity offers across different stages? Drop a comment.
Disclaimer:
This is educational content from Silly Money, not tax, legal, or investment advice. Taxes are complicated and your situation is unique. Talk to a qualified professional before making decisions based on anything you read here.
