How Cap Tables Work: Startup Equity from Founding Through Series A

What You'll Learn

• ✓Explain how equity is divided at founding and why shares are not the same as ownership percentage
• ✓Describe how an employee option pool is created and how it affects founder dilution
• ✓Walk through the mechanics of a priced funding round including pre-money valuation, new shares, and post-money ownership
• ✓Read a multi-round cap table and calculate any stakeholder's ownership percentage

What a Cap Table Actually Is

A capitalization table (cap table) is a spreadsheet that tracks who owns what in a company. It lists every shareholder, the number of shares they hold, the type of shares (common, preferred, options), and their ownership percentage. It is the single source of truth for equity. At its simplest, a cap table is just a list: name, share class, number of shares, percentage. But as a company raises money, grants options, and adds investors, the table gets complex fast. Most startups use software like Carta, Pulley, or Angelist to manage cap tables because manual spreadsheets become error-prone after a few rounds. Why does this matter? Because every decision about equity — co-founder splits, employee grants, investor negotiations — changes the cap table. If you do not understand how these changes work mechanically, you can accidentally give away too much, dilute yourself more than expected, or agree to terms you do not fully understand. The math is not hard, but it is ruthlessly precise. A 1% error in a cap table can represent millions of dollars in later rounds.

Founding: Creating Equity from Nothing

When a company is incorporated, it authorizes a certain number of shares — typically 10 million. This number is somewhat arbitrary but has become standard because it makes the per-share price low enough for option grants and high enough to avoid awkward fractions. The founders then issue shares to themselves from this authorized pool. If two co-founders split equally, each gets 5 million shares. The cap table at this point is beautifully simple: Founder A has 50%, Founder B has 50%, and the shares are worth whatever the founders decide (often $0.001 per share, just enough to have a real transaction for legal purposes). Vesting is critical even at founding. Most founders vest their shares over 4 years with a 1-year cliff, meaning if a co-founder leaves in month 6, they forfeit all their shares. Without vesting, a co-founder who leaves after two months keeps their full equity stake while contributing nothing further. This happens more often than anyone likes to admit, and fixing it retroactively is expensive and adversarial. The one-year cliff means no shares vest during the first 12 months. At month 12, 25% vests at once. After that, shares vest monthly or quarterly over the remaining 36 months. The company typically has a repurchase right on unvested shares, so departing founders give up what they have not earned.

The Option Pool: Reserving Equity for Employees

Before raising outside money, most startups create an employee stock option pool — shares reserved for future employee grants. A typical initial pool is 10-20% of the company. This is where your first hires get their equity. Here is the mechanical effect that surprises many founders: creating the option pool dilutes the founders, not the investors. If the founders own 100% and create a 15% pool, the founders now own 85%. The pool itself has no owner yet — the shares sit in reserve until granted to employees. Why do investors insist on a pool before they invest? Because they do not want to be diluted by future employee grants. By creating the pool pre-investment, the dilution comes entirely from the founders' share. Investors know this, and aggressive investors sometimes push for a larger pool than necessary (20-25%) specifically because it increases their effective ownership. As a founder, push back on oversized pools. Calculate your actual hiring plan for the next 18 months and size the pool to cover those grants with a reasonable buffer. A pool that is too large means you gave up ownership for shares that may sit unused. A pool that is too small means you need to expand it before the next round — which dilutes everyone, including the investors who insisted on the original size.

Priced Rounds: How Investment Changes the Cap Table

When a startup raises a priced round (seed, Series A, etc.), new shares are created and sold to investors. This is the mechanics of dilution — the total number of shares increases, so everyone's percentage decreases even though their share count stays the same. Here is a concrete example. Pre-investment: 10 million shares outstanding (8.5M to founders, 1.5M in the option pool). An investor offers $2 million at a $8 million pre-money valuation. The pre-money valuation of $8M divided by 10M shares gives a price per share of $0.80. The investor's $2M buys 2,500,000 new shares ($2M / $0.80). Total shares are now 12.5 million. Post-money ownership: Founders hold 8.5M / 12.5M = 68%. Option pool holds 1.5M / 12.5M = 12%. Investor holds 2.5M / 12.5M = 20%. The post-money valuation is $10M ($8M pre + $2M investment). Notice what happened: the founders went from 85% to 68%. They did not sell any shares — they were diluted by the creation of new shares. But their shares are now worth more per share ($0.80 vs $0.001), so the total value of their holdings increased dramatically. This is the fundamental trade-off of fundraising: you own a smaller percentage of a larger, more valuable pie. BusinessIQ includes interactive cap table exercises that let you model different valuation and investment scenarios to see how each variable affects post-round ownership.

Reading a Multi-Round Cap Table

After a seed round and a Series A, a cap table might look like this: Founder A: 4,250,000 common shares. Founder B: 4,250,000 common shares. Option pool: 1,500,000 common shares (some granted, some reserved). Seed investors: 2,500,000 Series Seed preferred shares. Series A investors: 3,333,333 Series A preferred shares. Total: 15,833,333 shares. To calculate anyone's ownership percentage, divide their shares by the total fully diluted share count. Fully diluted means you count all shares, including unexercised options and reserved pool shares. Founder A: 4.25M / 15.83M = 26.8%. Series A investors: 3.33M / 15.83M = 21.1%. Preferred shares (held by investors) carry special rights that common shares (held by founders and employees) do not: liquidation preference (investors get their money back first in a sale), anti-dilution protection, board seats, and pro-rata rights in future rounds. These rights mean preferred shares are worth more than common shares in a downside scenario — which is why the IRS allows companies to issue options at a lower exercise price than the preferred share price. The 409A valuation is an independent appraisal of the common stock's fair market value, typically 25-35% of the most recent preferred price for early-stage companies. This determines the exercise price of new option grants. A lower 409A means cheaper options for employees, which is better for recruiting. As you read a cap table across multiple rounds, the pattern repeats: each round creates new preferred shares, dilutes all existing holders proportionally, and potentially expands the option pool. The math compounds — by Series B, early founders who started at 50% might be at 15-25%, but their shares might be worth 100x more per share.

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