Most operators who start companies have spent years watching equity get issued, split, and diluted around them without understanding the mechanics. They've signed employment agreements with option grants without knowing what "cliff" or "acceleration" meant. They've watched founders from acquired companies walk away with far less than the headline number suggested. When it's their company—when they're the founder holding the startup equity—that ambiguity becomes expensive.
This isn't a legal guide. It's a working understanding of the mechanics that matter at the stages you'll actually encounter: incorporation, co-founder split, first investors, early employees, and the Series A.
The cap table is the foundation
The cap table is your company's ownership record. At incorporation, it shows founders and their share counts. After your first investment, it adds investors. After your first employee option grants, it adds a pool of shares reserved for future employees. Every round, every grant, every conversion of a SAFE note or convertible note changes the cap table.
The most important thing to understand about the cap table is that percentage ownership is a moving target. What you own today is not what you'll own after your next round. What matters is not preserving your percentage—it's making sure that each round of dilution is exchanged for something that makes the company more valuable.
Vesting: why it exists and what to negotiate
Standard vesting in a startup is a four-year schedule with a one-year cliff. You earn nothing in the first 12 months. At the 12-month mark, 25% of your grant vests at once (that's the cliff). Then the rest vests monthly or quarterly over the following 36 months.
Vesting protects the company—and you—from a co-founder who leaves early with a large block of shares that dilutes everyone else without having contributed to building the business. When you're evaluating a co-founder agreement, look at double-trigger acceleration: it means if the company is acquired AND you're forced out within a year, your unvested shares accelerate. That's worth negotiating for.
Vesting also applies to your own shares as a founder. When you take investment, your existing shares often get placed on a vesting schedule retroactively as a condition of the term sheet. Investors do this to ensure you stay. Standard position is to negotiate for partial credit for time already spent—usually 12-18 months of cliff credit at signing.
How dilution works in practice
Every time new shares are created, existing shareholders' percentages go down. This is dilution. A seed round that issues 20% of the company to investors dilutes everyone else by 20%. A Series A that issues another 20% dilutes everyone again.
There's a second source of dilution that founders underestimate: the option pool. Before each funding round, investors typically require that you reserve 10-15% of the post-money shares for future employees. That pool comes from existing shareholders—meaning founders and early investors—before new money comes in. A $10M seed at $40M pre-money, with a 15% option pool refresh, means your effective dilution is closer to 32% than 20%.
The right way to think about this is not as a negotiating point but as a planning reality. Your cap table is going to look more diluted than your pitch deck suggested, faster than you think. Build your early equity grants with that in mind.
Co-founder equity splits: what most operators get wrong
The most common cap table mistake operators make is an even 50/50 split with a partner without a vesting schedule or a co-founder agreement that defines what happens if someone leaves. Even splits feel fair at the start and become sources of conflict when one founder is working full-time and the other isn't, or when the company pivots away from the original co-founder's area of contribution.
A better framework: assign percentage based on role, expected contribution, and what each person is giving up. The person leaving a $300k senior role to build full-time should own more than the person doing advisory work on weekends. Split it explicitly, vest it, and write down what happens to shares if someone exits in the first year.
See our deeper breakdown of co-founder equity splits for how to structure this conversation before it becomes necessary.
Employee stock options: what you're actually granting
When you grant a key early employee equity, you're granting stock options—the right to buy shares at today's price (the strike price) in the future. Options aren't shares. They become shares only when exercised, and they expire if not exercised, typically 90 days after the employee leaves.
Two types: ISOs (Incentive Stock Options) and NSOs (Non-Qualified Stock Options). ISOs have better tax treatment for employees but come with eligibility restrictions. Your early key employees should get ISOs where possible. Advisors and consultants get NSOs.
The option pool percentage you allocate matters more than the individual grants. A 10% option pool spread across 20 early employees means your first engineering hire is getting 0.5% before dilution. The number that shows up in their offer letter needs to be paired with honest context about what it means at different exit scenarios.
The SAFE note: how most pre-seed rounds actually work
A SAFE (Simple Agreement for Future Equity) is not a loan. It's a contract that converts into equity when the company does a priced round. Most pre-seed rounds today are done with SAFEs because they're fast and cheap to close—no lawyers negotiating term sheets, no priced shares, no immediate dilution calculation.
What most founders underestimate is how SAFEs stack. If you do two SAFE rounds before your seed—one at a $3M cap and one at a $5M cap—both convert at your seed valuation. If your seed is at $8M post-money, the $3M cap holders convert at a steep discount to seed investors. The cap table math after conversion can surprise you.
Model this before you close any SAFE round. Your lawyer or a cap table tool will run the scenarios for you. The goal is to go into your first priced round knowing exactly where every stakeholder lands.
If you're about to raise for the first time and want a real-world conversation about how this structure affects the deal you're about to sign, pitch us—the equity structure conversation is usually the one we have first.