Principal

In fixed income investing, the principal is the face value or par value of a bond, the amount that the issuer promises to repay to the bondholder at the maturity of the instrument. As described in the Debt Security article in Section D, the standard par value for most US bonds is one thousand dollars, and the periodic coupon interest payments are calculated as a percentage of this principal amount. The return of principal at maturity represents the recovery of the investor's original capital investment, with the coupon income received during the life of the bond representing the return on that principal.

In lending, the principal is the original amount borrowed that the borrower is obligated to repay over the life of the loan, distinct from the interest that accrues on the outstanding principal balance. Mortgage amortisation schedules illustrate the distinction clearly, with each monthly payment divided between an interest component calculated on the outstanding principal balance and a principal component that reduces the outstanding loan balance. In the early years of a mortgage, the interest component dominates and relatively little of each payment reduces the principal balance. As the loan matures and the principal balance declines, the interest component shrinks and an increasing proportion of each payment goes toward principal reduction.

The concept of principal preservation is central to the investment objectives of many conservative investors, particularly those in or approaching retirement who need their portfolio to maintain its value while generating income. An investment objective of principal preservation means that the investor prioritises avoiding losses of the original capital above all other considerations, accepting lower returns in exchange for the highest possible probability of recovering the full amount initially invested. This objective shapes the asset allocation toward capital-stable instruments including short-duration bonds, certificates of deposit, and money market funds that minimise the risk of loss of the original principal.

Principal risk, also called capital risk, is the risk that an investor will receive back less than their original investment, losing some or all of the principal they committed. Principal risk is the most fundamental dimension of investment risk for conservative investors and is the primary reason that higher-risk investments must offer higher expected returns to attract capital from investors who could alternatively choose the relative safety of principal-preserving instruments.

Principal in the Principal-Agent Relationship

In the legal and regulatory context of agency relationships, a principal is the party on whose behalf an agent acts, making decisions and taking actions that bind the principal in the same manner as if the principal had acted personally. The principal-agent relationship is one of the most fundamental legal relationships in business and finance, arising whenever one party, the principal, delegates authority to another party, the agent, to act on the principal's behalf in dealings with third parties.

The principal-agent relationship creates a set of legal obligations on both parties that govern the conduct of the agency. The agent owes fiduciary duties to the principal including the duty of loyalty requiring the agent to act in the principal's interest rather than their own, the duty of care requiring the agent to act with appropriate skill and diligence, and the duty of disclosure requiring the agent to share material information with the principal. The principal in turn has obligations to the agent including the obligation to compensate the agent as agreed and to indemnify the agent for liabilities reasonably incurred in the performance of their duties.

In the investment advisory context, the investment adviser acts as an agent for the client who is the principal, making investment decisions on the client's behalf within the authority granted through the advisory agreement and the investment policy statement. The agent's authority may be discretionary, allowing the adviser to make investment decisions without prior client approval, or non-discretionary, requiring client approval before each transaction as described in the Discretionary Account article in Section D. In both cases the client remains the principal whose interests the adviser is obligated to serve as a fiduciary.

The power of attorney relationship discussed in the preceding article is a specific form of the principal-agent relationship in which the principal expressly documents and formalises the authority granted to the agent through the power of attorney document. The agent under a power of attorney is sometimes called the attorney-in-fact, but their legal role is that of agent acting on behalf of the principal who granted the power.

Corporate governance is structured around a layered principal-agent relationship in which shareholders are the ultimate principals who own the corporation, directors are agents of the shareholders who oversee the company's management, and officers and employees are agents of the corporation who execute the business plan under the direction of the board. This layered structure creates multiple levels of agency relationship each with its own set of fiduciary duties and accountability mechanisms, and the management of conflicts of interest that arise when the agents' personal interests diverge from the interests of the principals they serve is one of the central challenges of corporate governance.

Principal as Dealer in Securities Transactions

In the context of securities transactions, a principal is a party that buys or sells securities for its own account, acting as dealer rather than as broker or agent for another party. When a broker-dealer acts as principal in a transaction, it buys securities from its own inventory to sell to a customer, or sells securities from its inventory to a customer, earning the profit on the spread between the price at which it acquired the securities and the price at which it sells them rather than earning a commission for facilitating a transaction between third parties.

The distinction between principal and agency transactions is one of the most fundamental in the regulation of broker-dealer activity, with significant implications for the pricing transparency, conflict of interest management, and disclosure obligations applicable to each type of transaction.

In a principal transaction, the broker-dealer is the counterparty to the customer's trade, selling securities from its own inventory to the customer at a markup above the price at which it acquired the securities, or buying securities from the customer at a markdown below the price at which it will subsequently sell them. The broker-dealer profits from this markup or markdown, which represents the economic equivalent of the commission earned in an agency transaction but is embedded in the price of the securities rather than charged as a separate explicit fee. Because the markup or markdown in a principal transaction is not separately disclosed as a commission, it can be less transparent to customers than the explicit commission charged in an agency transaction.

In an agency transaction, the broker-dealer acts as an intermediary that facilitates a transaction between the customer and another party in the market, neither buying nor selling securities for its own account. The broker-dealer earns a commission for this intermediation service, which is disclosed explicitly to the customer as a separate charge rather than being embedded in the price of the securities.

FINRA's five percent policy provides general guidance that the combined total of markups, markdowns, and commissions charged by broker-dealers in customer transactions should not exceed five percent of the transaction price, though this is a guideline rather than an absolute rule and the appropriate charge depends on the specific characteristics of each transaction. In principal transactions the markup or markdown must be calculated from the prevailing market price of the security rather than from the broker-dealer's acquisition cost, ensuring that the customer pays a price related to the current market value of the securities rather than to the historical cost of the broker-dealer's inventory.

Principal Transactions and Investment Adviser Conflicts of Interest

The intersection of the principal transaction concept with the investment adviser fiduciary obligation creates one of the most significant conflict of interest scenarios in the investment advisory industry, requiring specific disclosure and consent procedures that are directly tested on securities examinations.

As described in the Discretionary Account article in Section D, Section 206(3) of the Investment Advisers Act prohibits a registered investment adviser from acting as principal in any transaction with a client without providing written disclosure of the principal nature of the transaction and obtaining the client's consent before or at the time of the transaction. This prohibition reflects the recognition that a principal transaction between an investment adviser and a client creates a direct conflict of interest, as the adviser simultaneously represents the client's interest as their fiduciary and has a personal financial interest in the price of the transaction as the other party to the trade.

The Section 206(3) disclosure and consent requirement cannot be waived in advance by a blanket provision in the investment advisory agreement, meaning that each individual principal transaction requires contemporaneous or prior written disclosure and consent rather than relying on general pre-authorisation. This transaction-by-transaction consent requirement ensures that clients are specifically aware of each instance in which their adviser is acting as counterparty rather than as pure fiduciary, allowing them to make informed decisions about whether to proceed with each specific transaction on the disclosed terms.

The practical implications of Section 206(3) mean that investment advisers who wish to sell securities from their own inventory to advisory clients, or to purchase securities from advisory clients into their own inventory, must implement specific compliance procedures including the preparation and delivery of principal transaction disclosure documents for each such transaction and the collection and documentation of client consent. Many investment advisers choose to avoid principal transactions with advisory clients entirely rather than implementing the required disclosure and consent procedures, simplifying their compliance obligations and eliminating the associated conflict of interest.

Principal in Fixed Income Pricing

In fixed income markets, the principal-agent distinction takes on an additional practical dimension related to the pricing conventions used in different market segments.

The municipal securities market, the corporate bond market, and most other fixed income markets trade primarily on a principal basis, with broker-dealers acting as market makers who buy bonds from sellers and sell bonds to buyers from their own inventory, earning the spread between their purchase and sale prices as compensation for providing market-making services and bearing the inventory risk associated with holding bond positions. Unlike equity markets where agency execution through exchange order matching is more common, the over-the-counter nature of most fixed income markets makes principal market-making the dominant execution model.

The Municipal Securities Rulemaking Board requires dealers to disclose when they are acting as principal in municipal securities transactions with customers, providing customers with information about the nature of the transaction and the economic relationship between the dealer and the customer. The MSRB's fair pricing rules require that the total transaction price in a principal municipal securities transaction reflect a fair and reasonable markup or markdown from the prevailing market price, protecting customers from being charged excessive spreads in transactions where the dealer is acting as the direct counterparty.

Examination Relevance and Key Takeaways

Principal is tested on the SIE, Series 7, and Series 65 examinations across multiple contexts that reflect its different meanings in different financial settings. Candidates must understand the three primary meanings of the term including the original sum of money invested or borrowed, the party on whose behalf an agent acts in a principal-agent relationship, and the party acting as dealer on its own account in a securities transaction, and must be able to apply the correct meaning based on the context in which the term appears.

The core points to retain are these: in lending and investment principal refers to the original amount of money invested or borrowed as distinguished from the interest or returns generated on that amount; in agency law principal refers to the party who delegates authority to an agent to act on their behalf with the agent owing fiduciary duties to the principal including loyalty, care, and disclosure; in securities transactions principal refers to a dealer acting for its own account rather than as broker for a third party earning the spread between purchase and sale prices rather than a separate commission; Section 206(3) of the Investment Advisers Act prohibits registered investment advisers from acting as principal in transactions with advisory clients without written disclosure of the principal nature of the transaction and specific client consent before or at the time of each transaction; this disclosure and consent requirement cannot be waived in advance and applies to each individual principal transaction; the FINRA five percent policy provides guidance that markups markdowns and commissions in customer transactions should not exceed five percent of the transaction price as a general benchmark; and fixed income markets trade primarily on a principal basis with broker-dealer market makers earning the spread between bid and ask prices rather than charging explicit commissions as in most equity market transactions.