What Is a Stock?
What it actually means to own a share of a company, and the rights and risks that come with it.
⏱️ ~6 min read
Key Takeaways
- A stock (or share) is a unit of ownership in a company
- Shareholders have a claim on the company's profits and assets, proportional to how many shares they own
- Common stock usually comes with voting rights; preferred stock usually doesn't
- Stock value can go to zero if a company fails — there's no guaranteed return of your money
A share is a slice of ownership
When a company is formed, its ownership is divided into a fixed number of units called shares (or stock). If you buy a share, you become a part-owner of that business — no different in principle than owning a slice of a small local shop, except the company might have millions of owners instead of one or two.
Owning shares doesn't mean you can walk into headquarters and start making decisions, but it does mean you have a legal claim on a proportional slice of the company's profits, assets, and (for common stock) a vote on certain major decisions.
Example: What your stake actually represents
Imagine a company has issued 10,000,000 shares in total, and you own 100 of them.
Your ownership stake = 100 ÷ 10,000,000 = 0.001% of the company.
If the company earns $50 million in profit for the year, your proportional share of that profit is 0.001% × $50,000,000 = $500 — even though you may never receive that money directly (it depends on whether the company pays dividends or reinvests the profit).
Where shares come from: the IPO
Companies start out privately owned — by founders, employees, and early investors like venture capital firms. To raise large amounts of money for growth (and to let early investors cash out some of their stake), a company can go public through an Initial Public Offering (IPO).
In an IPO, the company sells a portion of its shares to the public for the first time, usually through investment banks that help set the price and find buyers. After the IPO, those shares trade freely between investors on a stock exchange — the company isn't usually a direct party to those later trades.
Common stock vs. preferred stock
Most individual investors own common stock. Common shareholders typically get one vote per share at the company's annual meeting (covering things like electing the board of directors or approving major mergers), and they're entitled to dividends if and when the company's board decides to pay them.
Preferred stock is a different class of shares that behaves more like a hybrid between a stock and a bond. Preferred shareholders usually receive a fixed dividend amount before common shareholders get anything, and they typically have priority if the company is liquidated — but they usually don't get voting rights, and their share price tends to move less than common stock.
What you're really betting on
When you buy a share, you're betting that the company will become more valuable over time — through growing profits, expanding into new markets, or simply becoming more efficient — and that other investors will recognize that value and be willing to pay more for the stock in the future.
The flip side is real: if a company performs poorly or goes bankrupt, the stock price can fall toward zero, and shareholders are last in line to be repaid (behind bondholders, lenders, and other creditors). This is why stocks are considered a higher-risk, higher-potential-return asset compared to things like savings accounts or government bonds.
How you actually 'hold' shares today
You don't receive a paper certificate anymore. When you buy stock through a brokerage account, your shares are held electronically in 'street name' — meaning the brokerage's clearing system tracks that you own them, while the actual securities are held in a central depository. You can sell, transfer, or in many cases set up dividend reinvestment on these shares entirely online.
Frequently Asked Questions
Do I own part of the company's buildings and cash if I buy one share?+
Indirectly, yes — but only in proportion to your tiny ownership stake, and only in the event of a full liquidation. In practice, owning a share gives you a claim on future profits and, for common stock, a vote on major decisions — not a right to use company property.
Can a stock's price go to exactly zero?+
Yes. If a company goes bankrupt and has no assets left after paying creditors, common shareholders typically receive nothing and the stock becomes worthless. This is the maximum loss on a long stock position — you can't lose more than you invested.
Is buying one share of a company 'investing'?+
Yes, technically — though most long-term investors aim to build a diversified portfolio of many companies (often through funds) rather than relying on the fortunes of a single stock.