A corporation can divide its stock into two broad classes, common and preferred, and then subdivide the preferred class into numbered series, each with its own negotiated terms. The classes and series of stock in a company’s charter determine who votes, who gets paid first when money is distributed, and what happens to earlier investors when later ones buy in at a different price. Common stock is the founders’ and employees’ instrument; preferred stock, usually issued in a Series A, Series B, and so on, is the instrument of outside investors.
Common Stock and Preferred Stock
A “class” of stock is a category carrying a distinct bundle of rights. Common stock is the baseline. Founders, employees, and early participants hold it, and it represents a residual claim on the company’s value. If the business thrives, common stockholders benefit without a ceiling. If it fails, they stand last in line behind every creditor and every preferred stockholder.
Preferred stock sits one tier higher. Holders accept a cap on some of their upside in exchange for a more predictable return and priority in the payout order. Preferred dividends get paid before common stockholders see anything, and if the company is sold or dissolved, preferred holders collect their negotiated amount first. That tradeoff is why preferred is the standard instrument for outside investors and common is the standard for people who want maximum exposure to growth.
Voting Rights Across Classes
Voting rights are the single most consequential distinction between classes. In a straightforward setup, each share of common gets one vote, and preferred may get one vote per share on an as-converted basis or no vote at all except on matters that directly affect its class rights. The articles of incorporation lock these allocations in, and changing them later requires a charter amendment approved by the affected classes.
Dual-class structures push voting further. A company can create two classes of common where Class A shares carry one vote each and Class B shares carry ten votes each. Founders hold the Class B shares, keeping voting control after selling a majority of the economic interest to outside investors. The approach gained mainstream visibility with Google’s 2004 IPO and has since become common among technology companies going public. Public investors in the single-vote shares have very little ability to influence management, which is why some institutional investors and index providers have pushed back against dual-class listings.
Preferred stockholders also negotiate protective provisions, which are veto rights over specific corporate actions. These require a separate class vote of the preferred holders before the company can amend the charter, take on debt outside the ordinary course, create a new class of stock senior to existing preferred, sell the company, or change the size of the board. Protective provisions give investors a check on management without requiring a board seat.
Dividends and Liquidation Preferences
Dividend rights vary significantly across classes. Common dividends are discretionary and paid only when the board declares them. Preferred dividends are contractual and may be cumulative, meaning that if the company skips a payment in one year, the unpaid amount carries forward and must be settled before common stockholders receive any distribution. Non-cumulative preferred dividends simply disappear if not declared in a given period.
Liquidation preferences determine who gets what if the company is sold, dissolved, or goes through a deemed liquidation event like a merger. A standard preference returns the preferred stockholder’s original investment (a “1x preference”) before any proceeds flow to common holders. Some investors negotiate a 2x or higher multiple, meaning they receive two or three times their investment off the top.
Participating vs Non-Participating Preferred
Participation rights sit on top of the liquidation preference and often decide how much of an exit reaches common stockholders.
- Non-participating preferred lets the holder choose between taking the liquidation preference or converting to common stock and sharing in the total proceeds pro rata. They cannot do both. In a large exit, conversion usually wins because the pro rata share exceeds the fixed preference.
- Participating preferred lets the holder collect the full liquidation preference first and then share in the remaining proceeds alongside common stockholders based on ownership percentage. This “double-dip” is significantly more favorable to investors and more dilutive to founders.
The difference between the two often represents millions of dollars in a sale, so founders should look closely at this term because it directly affects how much of an exit’s value reaches common stockholders.
How Series Work Within the Preferred Class
A series is a subdivision within a class. When a startup raises its first institutional round, those investors receive Series A Preferred Stock. The next round creates Series B, and so on. Each series belongs to the broader class of preferred stock, but each has its own dividend rate, liquidation preference, conversion price, and other terms negotiated during that specific funding round.
Later series typically have higher liquidation preferences because each round prices the company at a higher valuation, assuming the company is growing. A Series B investor who paid $5 per share has a different conversion ratio into common than a Series A investor who paid $1 per share. Each series’ terms are documented in a certificate of designation filed with the state, which becomes part of the corporate charter.
Dividend hierarchy between series is also negotiable. Series can rank on equal footing (sometimes called pari passu), so all preferred series share proportionally in any dividend distribution. Alternatively, later series can be structured to receive their dividends before earlier ones, creating a stacked priority where Series C gets paid before Series B, which gets paid before Series A. The specific hierarchy is spelled out in each series’ certificate of designation, and it becomes especially important in a down exit where there isn’t enough money to satisfy every preference in full.
Anti-Dilution Protections
Anti-dilution provisions protect preferred stockholders when the company issues new shares at a price lower than what earlier investors paid. Without them, a “down round” would reduce the value of existing preferred shares with no recourse. Two mechanisms dominate.
- Full ratchet drops the conversion price of the earlier series to match the new, lower price per share. If a Series A investor paid $10 per share and the company later sells Series B at $2 per share, full ratchet resets the Series A conversion price to $2, dramatically increasing the number of common shares the Series A investor would receive on conversion. This is aggressive protection that heavily penalizes founders and common holders.
- Weighted average adjusts the conversion price based on a formula that accounts for how many new shares were issued and at what price, relative to total shares outstanding. The adjustment is real but proportional. In the same scenario, the Series A conversion price would drop to somewhere between $2 and $10, depending on the size of the down round relative to the overall capital structure. This approach is more common in practice because it balances investor protection against excessive dilution of founders.
The practical difference is stark. In a given down-round scenario, full ratchet might leave a founder with 10% of the company while weighted average might leave them with 25% to 30%. Most venture financings use broad-based weighted average, and founders should push back hard against full ratchet unless they have no leverage.
Conversion Rights
Preferred stock is almost always convertible into common, and the conversion terms are among the most heavily negotiated provisions in any financing round.
- Optional conversion lets the preferred stockholder convert to common at any time at the applicable conversion ratio. It matters when the common becomes more valuable than the preferred’s liquidation preference, such as in a large exit where pro rata participation as a common holder would pay more than the fixed preference.
- Automatic conversion flips all preferred to common upon a “qualified public offering,” typically defined as an IPO that meets a minimum price per share (often a multiple of the original purchase price) and raises at least a specified dollar amount in net proceeds. This ensures that when the company goes public, all stock converts to a single class of common, simplifying the public company’s capital structure.
- Mandatory conversion sets a deadline, converting automatically after a set number of years regardless of whether an IPO occurs.
The conversion ratio starts at 1:1 and adjusts over time based on anti-dilution provisions, stock splits, and stock dividends. Tracking the current conversion ratio for each series is essential because it determines how much of the common stock pie each preferred series would claim on conversion.
Blank Check Preferred Stock
Most companies that anticipate raising multiple rounds include blank check preferred authority in their charter. The provision authorizes a block of preferred shares but leaves the specific terms of each series undefined, giving the board power to fill in the blanks later by filing a certificate of designation. Without blank check authority, every new series would require a shareholder vote to amend the charter, which adds weeks of delay and legal cost to each fundraising round.
Blank check preferred also has a defensive use. A board facing a hostile takeover can issue a new series with special voting rights or conversion features designed to make the acquisition prohibitively expensive. This is the foundation of a shareholder rights plan, commonly called a poison pill. The board designates a series that existing shareholders can purchase at a steep discount if a hostile acquirer crosses a specified ownership threshold, flooding the market with new shares and diluting the acquirer’s stake. Whether that reads as responsible governance or board entrenchment depends on which side of the table you sit on.
What the Charter Has to Say
Every corporation’s articles of incorporation must specify the classes of stock the company is authorized to issue, the total number of shares in each class, and the rights and preferences attached to each. At minimum, the charter needs to address voting rights, dividend rights, liquidation preferences, and conversion mechanics for every class. If the company plans to subdivide a class into series later, the charter should grant blank check authority to the board.
Par value is a nominal face value assigned to each share in the charter. It has almost no economic significance today, but it does create a legal floor below which shares cannot be issued. Most companies set par value at a fraction of a cent per share. Apple’s par value is $0.00001, and Amazon’s is $0.01. Setting par value extremely low avoids complications when issuing shares to early founders for minimal consideration.
One detail that catches companies off guard: the total number of authorized shares affects franchise tax calculations in some states. A company that authorizes 100 million shares when it only needs 10 million may pay thousands of dollars more per year in state franchise taxes for no reason. Authorize enough shares to cover the current capital structure, the option pool, and a reasonable buffer for future issuances, but check the tax consequences in the state of incorporation before picking a large round number.
The S-Corporation Exception
If the company has elected S-corporation status for tax purposes, everything above changes. An S-corp can have only one class of stock. Violating that rule terminates the S-election and converts the company to a C-corporation with potentially severe tax consequences.1Internal Revenue Service. S Corporations
The one-class rule has an important carve-out. Differences in voting rights among common shares do not create a second class of stock, so an S-corp can issue voting and non-voting common shares without jeopardizing its election.2Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined What triggers a second class is any arrangement giving different shareholders different rights to distributions or liquidation proceeds. A shareholder agreement allocating profits disproportionately, for example, could be treated as creating a de facto second class.
Debt instruments also pose a risk. If a shareholder loan looks enough like equity, the IRS can reclassify it as a second class of stock. The statute provides a safe harbor for “straight debt”: a written, unconditional promise to pay a fixed amount on demand or on a specific date, with interest rates that are not contingent on profits or the company’s discretion, no convertibility into stock, and a creditor who is an eligible individual, estate, trust, or professional lender.2Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined Short-term unwritten advances under $10,000 that the parties treat as debt and expect to repay within a reasonable time are also safe.
The takeaway for S-corporations: if you need different classes of stock with different economic rights, you need to be a C-corporation. That decision carries its own tax implications, but it is the only structure that supports a true multi-class equity setup.