Look at almost any venture-backed cap table and you'll see at least two kinds of stock: common and preferred. Same company, same pot of future proceeds, but very different contracts. Understanding common vs preferred stock is the highest-leverage piece of cap-table literacy, because nearly every negotiation with an investor is really about what the preferred gets that the common doesn't.
The short version: common stock is the plain, default ownership that founders, employees, and advisors hold. Preferred stock is common plus a negotiated stack of extra rights (get-paid-first rights, dilution protection, board seats, vetoes) that investors pay a premium price for. This lesson unpacks each right, then runs a two-class cap table through a downside sale so you can see the difference in dollars.
What a share class is
A share class is a group of shares that all carry the same rights, defined in the company's charter (certificate of incorporation in the US; articles of association in the UK, where the classes are called ordinary and preference shares). Rights attach to the class, not the person: hold Series A Preferred and you have Series A rights, whether you're a fund or an angel.
A typical venture-backed company ends up with:
- Common stock: one class, held by founders, employees (via exercised options), and advisors. Options and the option pool sit on top of common: an option is the right to buy common at a fixed price.
- Preferred stock: usually one series per priced round: Series Seed, Series A, Series B. Each series is its own sub-class with its own price and terms, because each round is its own negotiation.
"Preferred" is not a grade of quality. It's shorthand for "carries preferences", contractual rights that fire in specific situations. Day to day, common and preferred behave identically; the differences show up at exactly the moments that matter most: a sale, a down round, a board vote.
Why investors get preferred and founders don't
The reason is price asymmetry, not privilege. A founder buys common at incorporation for a nominal amount, a few hundred dollars for millions of shares. An investor then pays, say, $2.00 per share for the same upside. If both held identical stock and the company sold cheaply next year, the founder could still multiply their money while the investor loses most of theirs. Preferences protect the person who paid the premium: "if this goes badly, I get my money back before you profit from mine."
Founders and employees hold common for equally practical reasons:
- It keeps the deal honest. Founders profit when the outcome is genuinely good, not when the company is sold for the investors' money back.
- It makes options work. Employee options are struck at the fair market value of common, appraised well below the preferred price precisely because common lacks the preferences. That gap is where early-employee upside comes from; see granting options the right way.
- It's simple. One common class for everyone who earns equity through work keeps the cap table legible. (Founder shares usually carry reverse vesting (see the next lesson), but that's a contract on top of common, not a separate class.)
Preferred price is not common price. If your Series A sold preferred at $2.00 per share, your common is not worth $2.00. The preferences account for a large part of the gap. This is why a company that raised at $2.00 can properly grant options at a $0.60 strike, and why multiplying your common shares by the last round's price overstates what you'd actually receive in most exits.
Liquidation preference: the core of "preferred"
The liquidation preference is the right that defines preferred stock. In a sale or wind-down, preferred holders receive a fixed amount, almost always 1× the money they invested, before common receives anything. Standard venture preferred is 1× non-participating, which means the investor makes a choice at exit:
- Take the preference (their money back), or
- Convert to common and take their percentage of the whole pot.
Whichever pays more. Never both.
Worked example: 1× non-participating preference
An investor puts $5M into a Series A at a $20M post-money valuation, receiving preferred equal to 25% of the company.
Exit at $100M: the preference pays $5M; converting pays 25% × $100M = $25M. The investor converts. The preference is irrelevant, and everyone shares pro-rata, as if there were one class.
Exit at $15M: converting pays 25% × $15M = $3.75M; the preference pays $5M. The investor takes the preference. Common splits the remaining $10M, about 11% less than a pure pro-rata split would have given them.
Break-even: 25% × X = $5M → X = $20M. Above the post-money valuation the preference is dead weight; below it, it bites. A 1× preference is downside insurance priced at exactly what the investor paid.
Two variants make preferences more expensive for common:
- Participating preferred ("double dip"): the investor takes the $5M back and then shares in the remainder pro-rata. In the $15M exit above, that's $5M + 25% × $10M = $7.5M, versus $5M non-participating. Sometimes softened by a cap (e.g. participation stops at 3× total return). Common at early stage in most markets: no. Worth pushing back on: yes.
- Multiples above 1× (2×, 3×): the investor gets two or three times their money before common sees anything. Rare in healthy rounds; they appear in rescue financings and aggressive late-stage deals.
When multiple series exist, seniority decides the order: preferences can stack last-in-first-out (Series B before Series A) or rank pari passu. Liquidation waterfalls works through the multi-round math.
The rest of the preferred package
The liquidation preference is the headline economic right. Four more travel with almost every venture round.
Anti-dilution protection
If the company later raises a down round (new shares priced below what the investor paid), anti-dilution adjusts the investor's conversion ratio so they end up with more common shares on conversion, partially offsetting the loss. The market-standard formula is broad-based weighted average, which scales the adjustment by how much cheap stock was actually sold; the aggressive version, full ratchet, reprices the investor's entire holding to the new low price. If an investor bought at $2.00 and a down round prices at $1.00, full ratchet doubles their as-converted shares, while weighted average might move their effective price to $1.75, roughly 14% more as-converted shares. The difference lands entirely on the common holders. (See dilution math for the mechanics.)
Pro-rata rights
The right, not the obligation, to invest in future rounds to maintain current ownership. An investor holding 10% with pro-rata rights can buy 10% of the next round's new shares. Friendly to the company (more committed capital), but it consumes round capacity a new lead may want.
Board seats
Preferred series usually get the right to elect one or more directors, voted by that series alone. A typical post-Series A board: two common seats (founders), one preferred seat (the lead investor), sometimes one independent. Board composition, not share percentage, is what actually governs a startup.
Protective provisions
A list of actions the company cannot take without a separate vote of the preferred class: selling the company, issuing a senior series, changing the charter, taking on debt above a threshold, paying dividends, increasing the option pool. Each item is effectively a veto. Reasonable lists protect investors from being rewritten out of their own deal; overlong lists hand a minority holder operational control. Read this list as carefully as the valuation.
Preferred also customarily carries information rights and a dividend preference, at early stage almost always non-cumulative and never actually paid.
A two-class cap table in a downside sale
Now put it all together. This is where common vs preferred stock stops being abstract. Here is a simple post-Series A cap table:
| Holder | Class | Shares | Ownership |
|---|---|---|---|
| Founders | Common | 6,500,000 | 65% |
| Employees (exercised options) | Common | 1,000,000 | 10% |
| Series A investors ($5M at $2.00) | Preferred, 1× non-participating | 2,500,000 | 25% |
| Total | 10,000,000 | 100% |
Worked example: who gets what when the sale price disappoints
Sale at $8M (well below the $20M post-money): the Series A compares converting (25% × $8M = $2M) against the preference ($5M) and takes the preference. Remaining for common: $8M − $5M = $3M across 7,500,000 common shares = $0.40 per share.
Founders: 6,500,000 × $0.40 = $2.6M, not the $5.2M their "65%" suggests.
Employees: 1,000,000 × $0.40 = $0.4M.
Series A: $5M, which is 62.5% of the proceeds on 25% of the shares.
Sale at $4M: the preference ($5M) exceeds the whole price. Preferred takes all $4M; founders and employees get $0. Every dollar of sale price below the total preference belongs entirely to investors.
Same $8M sale with participating preferred instead: Series A takes $5M, then 25% of the remaining $3M, for $5.75M total, leaving common $2.25M. The participation clause cost the common holders $750K at signature time, invisibly.
The lesson generalizes: your ownership percentage is your share of the upside, not of every outcome. Below the preference stack, common's economics compress fast and hit zero. This is also why running exit numbers before you sign a term sheet matters more than arguing over a point of dilution. In Vquity's waterfall and exit modeling, you can set up the classes, preferences, and participation terms from a term sheet and see what each class would receive across a range of sale prices before the terms are locked.
When preferred becomes common
Preferred stock is convertible into common at any time at the holder's option. That's the mechanism behind the "take the preference or convert" choice. The initial ratio is 1:1, and anti-dilution adjustments work by improving it. Two conversion facts complete the picture:
- IPOs force conversion. Charters convert all preferred into common automatically on a qualified public offering (and usually on a majority vote of the preferred). Public markets won't price private preference stacks, so the classes collapse to one.
- "Fully diluted, as-converted" is the honest count. Quoted ownership percentages should count every preferred share as the common it converts into, plus every option and the unallocated pool. Any other basis makes percentages incomparable across classes.
That's the two-class system: common for the people who build, preferred for the people who fund, and preferences that only matter when things go sideways, which is precisely why they're negotiated hardest. Next up: how equity is earned over time, through vesting schedules, cliffs, and what happens when someone leaves.