The different types of securities recognized under U.S. federal law fall into six working categories: equity (stocks), debt (bonds and notes), hybrids that combine features of both, investment company shares (mutual funds and ETFs), derivatives (options, futures, and warrants), and asset-backed securities built from pools of loans. The Securities Act of 1933 lists dozens of qualifying instruments, and a Supreme Court test from 1946 catches arrangements the statute doesn’t name. If you put money into a venture expecting to profit from someone else’s efforts, you’re likely holding a security.
How the Law Defines a Security
The Securities Act of 1933 lists what counts: stocks, bonds, notes, debentures, investment contracts, options, warrants, and certificates of deposit for securities, plus a catchall for “any interest or instrument commonly known as a security.”1Office of the Law Revision Counsel. 15 USC 77b – Definitions; Promotion of Efficiency, Competition, and Capital Formation The breadth is intentional. Congress wanted the definition wide enough to cover financial products that hadn’t been invented yet.
For arrangements that don’t fit the list, courts apply the test from SEC v. W.J. Howey Co. An investment contract is a security when a person invests money in a common enterprise and expects profits from the efforts of a promoter or third party.2Justia Law. SEC v. Howey Co., 328 US 293 (1946) That flexible test is what lets regulators reach newer products like certain cryptocurrency tokens and crowdfunding interests. If the economics look like a security, the label on the package doesn’t matter.
Once an instrument meets the definition, the issuer generally must register it with the SEC and provide detailed financial disclosures before selling it publicly. Several categories and offering types are exempt, which is covered further down.
Equity Securities
Equity securities represent ownership in a corporation. Common stock is the familiar form and usually carries voting rights, letting shareholders elect board members and vote on major decisions. Preferred stock is different: holders receive a fixed dividend paid before any common dividend, but preferred shares typically don’t vote. Both give the holder a stake in the company’s net value.
Publicly traded companies must file annual reports on Form 10-K, quarterly reports on Form 10-Q, and current reports on Form 8-K when certain events occur.3U.S. Securities and Exchange Commission. Form 10-K Those filings give shareholders ongoing visibility into financial health, executive compensation, and risk factors. Dividends are distributions of corporate profits, but a company doesn’t have to pay them unless the board formally declares one.
In a liquidation, equity holders sit at the back of the line. Creditors and bondholders get paid first; shareholders receive whatever is left. That priority is the tradeoff for the unlimited upside that ownership provides.
Debt Securities
Debt securities create a creditor relationship. The investor lends money to the issuer, and the issuer agrees to repay it with interest by a set date. Bonds and debentures are the most common forms, with interest paid at a fixed or floating rate and principal returned at maturity regardless of whether the company had a profitable year. That contractual obligation is the core difference from equity.
When a company issues bonds worth more than a certain threshold to the public, federal law requires a trust indenture, a formal agreement that spells out the issuer’s obligations and appoints an independent trustee to look out for bondholders. If the issuer defaults, the trustee can act to protect investors, including seizing collateral. Certificates of deposit issued by banks are another form of debt security; those are insured up to $250,000 per depositor, per insured bank, for each ownership category by the FDIC.4FDIC. Deposit Insurance at a Glance
Debt holders have priority over equity holders in bankruptcy. Secured creditors get paid first from their collateral, then unsecured creditors, and only then shareholders. That higher standing is why bonds are generally considered less risky than stock in the same issuer.
Credit Ratings
Before buying a bond, most investors check its credit rating. The SEC registers the firms allowed to issue these ratings as Nationally Recognized Statistical Rating Organizations. The current list includes S&P Global Ratings, Moody’s Investors Service, Fitch Ratings, and several smaller agencies.5U.S. Securities and Exchange Commission. Current NRSROs The rating drives both the interest rate the issuer has to pay and the universe of investors eligible to buy the bonds. A downgrade can raise borrowing costs overnight.
What Default Means for Investors
Missing a scheduled interest or principal payment is a default. Creditors can then accelerate the full balance, seize pledged collateral, or push the issuer into bankruptcy. Investors who lose money because an issuer lied about its financial condition can pursue class-action litigation under the Securities Exchange Act. The SEC can also bring civil enforcement actions seeking disgorgement and monetary penalties,6U.S. Securities and Exchange Commission. Enforcement and Litigation and securities fraud carries a maximum federal prison sentence of 25 years.7Office of the Law Revision Counsel. 18 U.S. Code 1348 – Securities and Commodities Fraud
Hybrid Securities
Hybrid securities blend debt and equity features in a single instrument. The most common example is a convertible bond. You start out as a creditor collecting interest, but you hold the right to convert the bond into a set number of the company’s shares if the stock price climbs enough to make that attractive. The structure gives you downside protection through fixed payments while preserving access to equity upside.
Preferred shares with mandatory redemption dates also fall into the hybrid category. They behave like debt because the issuer must buy them back on a set schedule, but they pay dividends rather than interest and sit in the equity section of the balance sheet until redemption. On risk, hybrids typically rank below senior debt and above common stock in a liquidation.
Companies use hybrids to raise capital without immediately diluting existing shareholders or paying the higher interest rates that come with straight bonds. The documentation has to spell out exactly when and how conversion happens, what triggers early redemption, and where the holder stands relative to other creditors. Regulators require marketing materials for hybrids to accurately reflect that complexity, because the risk profile is genuinely harder to evaluate than a plain bond or stock.
Investment Company Securities
When you buy shares of a mutual fund or an exchange-traded fund, you’re buying a security issued by an investment company. Federal law classifies investment companies into three types: management companies, unit investment trusts, and face-amount certificate companies.8Office of the Law Revision Counsel. 15 U.S. Code 80a-4 – Classification of Investment Companies Almost everything a retail investor encounters is in the first bucket.
Management companies are further split into open-end and closed-end funds. Open-end funds, which include traditional mutual funds and most ETFs, continuously issue and redeem shares based on net asset value. You buy mutual fund shares directly from the fund at the price calculated after the market closes each day. ETFs trade throughout the day on stock exchanges at market prices that can drift slightly above or below net asset value. Closed-end funds sell a fixed number of shares in an initial offering, and those shares then trade on an exchange like stocks.9U.S. Securities and Exchange Commission. Mutual Funds and ETFs – A Guide for Investors
Investment companies must register with the SEC and follow detailed rules on governance, fee disclosure, and portfolio diversification.10U.S. Securities and Exchange Commission. Investment Company Registration and Regulation Package Fund investors are one step removed from the underlying stocks and bonds, trusting a portfolio manager with their money, which is exactly the kind of arrangement the securities laws exist to police.
Derivative Securities
Derivatives are contracts whose value is tied to an underlying asset like a stock, commodity, or interest rate. Options give you the right, but not the obligation, to buy or sell an asset at a set price before a certain date. Futures contracts go further: both parties are legally obligated to complete the transaction at the agreed price and time. Warrants work like options but are issued directly by the company, giving you the right to purchase new stock at a fixed price.
These instruments are used for hedging and for speculation. A farmer might sell wheat futures to lock in a price for next season’s harvest. A portfolio manager might buy put options to protect against a market decline. Contractual leverage means gains and losses can be magnified well beyond the initial investment.
Regulatory jurisdiction over derivatives is split. The SEC oversees options on individual securities and security-based swaps (contracts tied to a single security, a narrow group of securities, or events affecting a specific issuer). The Commodity Futures Trading Commission handles futures, commodity options, and most other swaps. The Dodd-Frank Act formalized that division and brought many previously unregulated swap contracts under federal oversight. Violations can bring fines, trading bans, and criminal charges.
Asset-Backed Securities
Asset-backed securities are made through securitization. A lender bundles income-producing debts like home mortgages, car loans, or credit card balances and sells interests in the pool to investors. The cash from borrowers’ monthly payments passes through to the security holders. The lender gets fresh capital to make new loans; the investor gets access to a diversified stream of payments that would be hard to assemble individually.
The legal architecture depends on a special purpose vehicle, a separate legal entity created solely to hold the pooled assets. The SPV is designed to be bankruptcy-remote, so if the original lender fails, its creditors can’t reach the assets sitting in the SPV.11National Bureau of Economic Research. Special Purpose Vehicles and Securitization That structural isolation is what makes the whole product viable. Without it, investors would be exposed to the lender’s overall health rather than the performance of the underlying loans.
Pools are typically sliced into tranches with different levels of risk and return. Senior tranches get paid first and carry higher credit ratings; junior tranches absorb the first losses when borrowers default. After the 2008 financial crisis, federal regulators imposed a risk retention rule: the entity packaging the securitization generally has to keep at least 5% of the credit risk on its own books.12eCFR. Part 244 – Credit Risk Retention (Regulation RR) The skin-in-the-game requirement is meant to align the securitizer’s incentives with those of investors. Certain qualifying pools backed by high-quality assets can see the retention requirement reduced or eliminated.
Securities That Skip Full Registration
Not every security has to go through full SEC registration. Federal law exempts several categories outright, including securities issued or guaranteed by the U.S. government, state and local governments, and federally regulated banks.13Office of the Law Revision Counsel. 15 U.S. Code 77c – Classes of Securities Under This Subchapter Retirement plan securities and certain insurance contracts are also exempt. The carve-outs recognize that other regulatory frameworks already handle investor protection for those instruments.
Private companies raising capital most often rely on Regulation D. Rule 506(b) allows unlimited capital from accredited investors and up to 35 sophisticated non-accredited investors, with no public advertising. Rule 506(c) permits public advertising, but every buyer must be accredited, and the company must take reasonable steps to verify that status.14U.S. Securities and Exchange Commission. Rule 506 of Regulation D Securities sold under either rule are restricted, meaning the buyer can’t freely resell them. Regulation A+ is another path, useful for companies wanting to offer securities to the public without full registration. Tier 1 offerings are capped at $20 million in a 12-month period; Tier 2 offerings can go up to $75 million.15U.S. Securities and Exchange Commission. Regulation A
How Securities Are Taxed
How a security is taxed depends on the type of instrument and how long you hold it. The most favorable treatment goes to long-term capital gains, which apply when you sell a security you’ve held more than one year. For 2026, single filers with taxable income up to $49,450 pay 0% on long-term gains. The 15% rate applies to taxable income between $49,450 and $545,500, and the 20% rate kicks in above that. For married couples filing jointly, the 0% threshold is $98,900, the 15% rate covers income up to $613,700, and the 20% rate applies above that.16Internal Revenue Service. Revenue Procedure 2025-32 Short-term gains on securities held one year or less are taxed at your ordinary income rate, which can reach 37%.
Dividends from stock split into two buckets. Qualified dividends, which include most dividends from domestic corporations and certain foreign companies, are taxed at the same favorable rates as long-term capital gains. Non-qualified dividends are taxed as ordinary income. Interest from corporate bonds is always taxed as ordinary income. Municipal bond interest is generally exempt from federal income tax, which is why munis remain popular with higher-income investors despite lower yields. High earners should also factor in the 3.8% net investment income tax on investment income above certain thresholds, which effectively raises the top rate on capital gains and dividends to 23.8%.