https://startupxplore.com/en/blog/dilution-shares/
The fundamental mechanism is that new investment is met by issuing new shares. If you hold options on a constant number of shares, and the number of shares into which ownership is divided goes up, then your fractional share of ownership goes down.
If you want to raise money you need to sell some stock. So the company creates new stock and sells that -- increasing the total number of shares. You don't get any of that new stock yourself, so your total ownership percentage goes down.
Of course in real life things are much more complicated. And, if I was a cynic, I'd say they are purposely complicated in an effort to screw people over.
If the company fails, all that means nothing. If the company goes big, it won't matter. But in the most likely exit case where the company sells for less than everyone was hoping, now you get into the interesting territory where the investors might make their 1.5x return before you see a cent.
It's not that founders don't understand this. It's that founders end up taking these conditions when they're low on negotiation leverage and choose between that and running out of funding, so it's an understandable decision. However, they also avoid talking about it unless forced to because it changes how you will value your stock, which changes how attractive your offer or current compensation is. As a rule I ask about it when I talk to startups about job offers.
they're purposely complicated, and recruiters and VCs will take advantage of people who don't know how to do the math or reason about the amount of value extraction they're capable of, telling folks "oh this stock could be worth 100x of what is now"
The founders and angel shares do not delute and your percentage goes down each round.
If your lucky they are worth the same.
[1] https://techcrunch.com/2017/09/13/how-pro-rata-works-in-vent...
You are correct that 50% is always 50%, but employee stock options are typically given as a number of shares, not as a percentage of the total, which is what allows for dilution. At least, that's how I understand it.
You won't stay at that percentage though, unless the founders agree to protect you from dilution. In that case, they'd compensate you with some of their own shares whenever you dilute to keep your percentage the same. It's not common for employees though.
Obviously depends on the situation and what valuation you got, but unless it's a down round, your percentage will be reduced, but that reduced amount will be worth more (on paper). Sure, you might no longer have 1% of a company valued $1m, you'll now have 0.5% of a company valued $5m.
The $5m won't come from a $3m investment, though. They'll take 20% for $1m, leading to a $5m valuation. And I don't know anyone that would give them a $3m liquidation preference in that deal. If your cash-on-paper (that is: shares vs total valuation) share doesn't grow in a round, that's a good time to think about getting out. If they were valued at $5m and are seeking investments valuing the company at $2m, run.
Yes, investors aren't throwing money around like they maybe used to, but I don't believe there's reason to be overly pessimistic. If the company becomes successful, you'll make money if you've been on board early enough (that is: if you took on risk).
VCs have gotten too good at extracting value from a company. In this day and age, I consider startup options to be worth $0.
If I'm looking at a startup, it's because I am either super excited about their idea, or super excited about having a lot more responsibility/learning opportunities than at an established company.
Those are the factors I'm valuing in my head vs. the actual dollar opportunity cost.