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Founder Equity: Ownership, Dilution and Option Pools
Your ownership percentage needs a date and a denominator. Start with the shares outstanding today, then work through the financing, hiring and exit decisions that change what you own.
Use these guides in the order the decisions reach your desk. The calculator helps you test a funding scenario; the case studies show why the headline valuation is only the beginning of the conversation.
Start here
Start with the ownership math
Build a baseline before another financing changes it.
Founder Equity Dilution Explained: Control, Down Rounds, and Option Pools
How down rounds, structured bridges, warrants, and option pools change founder ownership and voting control, with a clearly labeled worked hypothetical.
How Post-Money SAFEs Dilute Founders Before the Series A
Calculate what each post-money SAFE sells, how stacked caps and pro rata rights change the next round, and which cap-table scenarios to run before accepting another cheque.
The Option Pool Shuffle: Who Pays for Startup Hiring?
See how a pre-money option-pool top-up changes founder dilution, calculate a 10% post-close reserve correctly, and negotiate the pool from a real hiring plan.
Next steps
Follow the equity to an exit
Check which claims get paid and what happens to the shares reserved for hiring.
Liquidation Preference Waterfalls: The Exit Math Founders Miss
Calculate 1x non-participating, participating, multiple, and senior liquidation preferences before a sale turns the headline price into a very different common-stock payout.
What Happens to the Unused Option Pool When the Company Is Acquired?
Ungranted option pool shares usually receive no acquisition consideration, but the pricing concession they created at financing survives to closing. Model the pool twice.
How Founders Exit With Nothing
A $465 million sale that paid the founders zero, a court that called it entirely fair, and the arithmetic that turns a decade of your life into a below-market engineering salary.
Tools and reference
Try the numbers
- Dilution Calculator
See exactly how funding rounds affect your ownership stake.
Terms to know
- Cap Table
A cap table records who owns what after every financing, option grant, and conversion. How to read one on a fully diluted basis.
- SAFE
A SAFE turns cash into equity at your next priced round. Investment divided by the post-money cap is the ownership you have already sold.
- Anti-Dilution Provisions
Anti-dilution provisions reset the preferred conversion price after a down round, handing investors extra shares at common stock's expense.
- Founder Vesting
Founder vesting puts your own shares on a schedule. Why investors require it, how credit for time served works, and the 83(b) 30-day clock.
More on founder equity
AI Can Work and Its Investors Can Still Lose
AI infrastructure can create enormous value while early shareholders lose. How debt deadlines, dilution and rescue terms decide who owns the eventual profits.
When a Chinese VC Redemption Right Follows the Founder Home
How Chinese VC redemption clauses can turn a missed IPO into founder personal liability, court enforcement, and spending restrictions, plus what to negotiate before signing.
The Castel Family Voted Out the CEO Three Times and He Is Still There
Pierre Castel's Singapore fund and Luxembourg holding chain were built to prevent an heirs' war. Three shareholder votes later, nobody can say who runs the group.
LVMH Succession: Five Heirs, One Commandite, and No Vacant Job
LVMH shows why preserving family ownership does not choose the next chief executive. Separate inheritance, control, board authority, and the operating job.
What Does a 0% Convertible Note Really Cost? Cloudflare's $2.5 Billion Answer
Cloudflare borrowed $2.5 billion at a 0% coupon, spent $259.5 million limiting dilution, and showed founders where the real cost of convertible debt sits.
The Dual-Class Sunset Loophole: How Founder Control Gets Rebuilt
Cloudflare's Series FF and Class C plan shows how a board can replace an ownership sunset while preserving founder liquidity and voting control.
SpaceX IPO Lockups Explained: The Company Went Public Before Its Shares Did
How SpaceX's staged IPO lockups released 911.5 million shares, why the stock rose anyway, and what founders should map before calling an IPO a liquidity event.
Founder Control After Seed: Board Seats, Votes, and Investor Vetoes
A founder can own most of the company and still lose a decisive vote. Map board seats, stockholder votes, appointment rights, and investor consents before your seed round closes.
The Seed-Stage Mistakes That Can Cost Founders Everything
Five seed-stage mistakes that can cost founders their equity, company control, and personal assets, with real cases and a document-by-document audit.