Traders at investment banks quote prices that let clients buy and sell securities, take the other side of those trades using the bank’s own capital, and then hedge the resulting inventory so a market move doesn’t wipe out the day’s profits. The work is fast, quantitative, and heavily regulated. Most traders specialize in one asset class and spend their careers learning how that specific corner of the market behaves.
Market Making Is the Core of the Job
The main activity for most bank traders is market making. A market maker publishes two prices for a security at all times: a bid, which is the price the desk will buy at, and an ask, which is the price it will sell at. The gap between them is the spread, and it is the main way the desk earns money. By standing ready to trade whenever a client calls, the desk gives institutional investors, hedge funds, and other counterparties the ability to transact without hunting around for someone on the other side.
When the desk fills a client’s order, the bank temporarily owns the securities. The trader is acting as a principal, which means the bank’s own capital is at risk between the moment of the fill and the moment the position is unwound or hedged. That principal role is where the legal framework kicks in. The Volcker Rule, codified at 12 U.S.C. ยง 1851, prohibits banks from speculative proprietary trading and limits market making to activity that is “reasonably expected” to meet near-term client demand.1Office of the Law Revision Counsel. 12 USC 1851 – Prohibitions on Proprietary Trading and Certain Relationships With Hedge Funds and Private Equity Funds Traders keep detailed inventory records, justify the size of positions they hold, and face regular review from compliance staff and federal regulators. The line between holding a position to serve clients and betting on where the price is headed is one that bank traders navigate every day.
Executing Client Orders
When a client wants to trade, the execution happens one of two ways. In an agency trade, the trader acts as a broker, going out to find the best available price and earning a commission. In a principal trade, the bank itself takes the other side. Principal trades are common for large block orders that would move the price against the client if dropped onto the open market all at once.
Best Execution
Traders don’t get to choose whichever route is convenient. FINRA Rule 5310 requires them to use “reasonable diligence to ascertain the best market for the subject security” and to execute so the client gets the most favorable price under current conditions. The obligation applies whether the trader is acting as agent or principal. Regulators look at the security’s liquidity, the transaction’s size, how many venues the trader checked, and the terms of the client’s instruction.2FINRA.org. 5310 Best Execution and Interpositioning A bad fill can’t be justified by pointing to a staffing shortage or a relationship with a particular venue.
Algorithms and Risk Controls
Large orders today are usually broken into smaller pieces by execution algorithms that release fragments over time using strategies like time-weighted average price (TWAP) or volume-weighted average price (VWAP). The goal is to reduce slippage, which is what happens when the pressure of a big order moves the market against you before it’s fully done.
These tools come with mandatory guardrails. SEC Rule 15c3-5 requires any firm providing market access to maintain risk management controls that automatically reject orders exceeding pre-set credit or capital limits, flag orders that blow past reasonable price or size thresholds, and restrict system access to pre-approved personnel. The firm’s CEO must personally certify compliance with these controls each year.3eCFR. 17 CFR 240.15c3-5 – Risk Management Controls for Brokers or Dealers With Market Access They exist because a single rogue algorithm can produce millions in losses in seconds.
Managing Inventory Risk
Every fill changes the bank’s inventory, and holding that inventory exposes the bank to price movement. If a trader buys $50 million in corporate bonds from a client and interest rates spike an hour later, the position has already lost value. Managing this exposure is a constant, intraday process called flattening the book.
Traders hedge by taking offsetting positions in related instruments. A desk holding corporate bonds might sell Treasury futures to protect against a broad rate move. An equity market maker sitting on a concentrated stock position might buy puts or sell index futures. The target is often a delta-neutral book, meaning the portfolio’s value won’t shift much on small market moves. Those hedges get recalculated all day as new trades come in and prices change.
Hedging isn’t only about protecting the desk’s profit. Bank regulators require capital reserves proportional to the risk a trading book carries under the Basel III framework, so a sloppy book doesn’t just risk losses on the position itself; it consumes capital the bank could deploy elsewhere.4Bank for International Settlements. Basel III: Finalising Post-Crisis Reforms Risk management and revenue generation collide on the same desk, every day.
Trading Desks and Specializations
Investment banks organize trading by asset class. The two broadest divisions are equities and fixed income, currencies, and commodities, usually called FICC. Within those, desks narrow further. An equities floor may split into cash equities, equity derivatives, and convertible bonds. FICC typically breaks into rates (government bonds and interest rate swaps), credit (corporate bonds and credit default swaps), foreign exchange, and commodities.
The daily work looks quite different across these desks. A rates trader tracks central bank policy, inflation data, and government debt issuance. A credit trader watches individual company health, balance sheet quality, and default risk. An FX trader follows geopolitical developments and cross-border trade flows. The analytical skills, risk profiles, and client bases differ enough that traders rarely switch desks mid-career.
Who Traders Work With on the Floor
Trading floors run on a three-role structure: traders, salespeople, and research analysts. Research analysts publish investment ideas based on fundamental work. Salespeople maintain client relationships and communicate those ideas to institutional investors. When a client decides to act, the salesperson relays the order to the desk, and the trader handles pricing and execution. The trader stays focused on market dynamics, risk, and execution quality; the salesperson stays focused on the client. Neither role works well if the person doing it is also trying to do the other one.
Information Barriers
The collaboration between teams has hard legal limits. Federal law requires every broker-dealer to maintain written policies to prevent the misuse of material, nonpublic information.5Office of the Law Revision Counsel. 15 USC 78o – Registration and Regulation of Brokers and Dealers Banks build information barriers, historically called Chinese walls, between departments. Investment bankers working on a merger hold material nonpublic information about the companies involved, and trading desks are physically and digitally separated from those bankers to keep that information from influencing trades. File access controls, floor plan separation, and restricted communication channels enforce the barrier. Violations can result in criminal insider trading charges under Section 10(b) of the Securities Exchange Act.6Office of the Law Revision Counsel. 15 USC 78j – Manipulative and Deceptive Devices
The Rules That Shape Every Decision
Beyond the Volcker Rule, several specific rules shape a trader’s day.
No Trading Ahead of Customers
FINRA Rule 5320 prohibits a firm from trading a security on its own account while holding an unexecuted customer order on the same side of the market at a price that would fill the customer.7FINRA.org. 5320 Prohibition Against Trading Ahead of Customer Orders If a client sends an order to buy a stock at $50, the desk can’t buy it at $50 for its own account first and then fill the client at a worse price. Surveillance systems flag potential violations automatically, and the consequences run from fines to career-ending sanctions.
Short Selling
Traders handling short sales must comply with Regulation SHO. Before executing a short sale, the broker-dealer must either borrow the security or have reasonable grounds to believe it can be borrowed for delivery by settlement, and must document that compliance.8eCFR. 17 CFR Part 242 – Regulation SHO – Regulation of Short Sales Every sell order must be marked long, short, or short exempt. Failures to deliver trigger mandatory close-out requirements. Market makers get a narrow bona fide market-making exception, but even that has limits.
Anti-Money Laundering
Institutional desks also sit inside the anti-money laundering regime. Before opening an account for a legal entity, the firm must identify and verify beneficial owners and at least one individual with significant management control, monitor ongoing activity for suspicious transactions, and refuse accounts for foreign shell banks.9U.S. Securities and Exchange Commission. Anti-Money Laundering (AML) Source Tool for Broker-Dealers Traders don’t run these checks themselves, but the surrounding compliance infrastructure exists because of these requirements.
A Broad Ethical Standard
Overlaying everything else is FINRA Rule 2010, which requires members to “observe high standards of commercial honor and just and equitable principles of trade.”10FINRA.org. 2010 Standards of Commercial Honor and Principles of Trade The broad language gives regulators discretion to pursue misconduct that no more specific rule addresses.
Licensing to Sit on a Desk
You can’t walk onto a desk and start executing orders. FINRA requires specific registrations. Equity traders need the Securities Trader Representative registration, which means passing the Securities Industry Essentials (SIE) exam and the Series 57 exam. The Series 57 covers executing transactions in equity, preferred, and convertible debt securities, including proprietary trading and OTC equity trading.11FINRA.org. Series 57 – Securities Trader Representative Exam You can’t even sit for these exams without a sponsoring FINRA member firm, so licensing is tied to employment.
Traders who also provide investment recommendations or interact with retail clients usually need the Series 7. Many states require the Series 63 for state-level securities law compliance. The specific combination depends on the desk and the firm’s model. New hires often spend their first weeks studying for and passing these exams before they touch a live order.
What the Job Pays
Compensation varies widely by desk, seniority, and firm performance. Entry-level traders (analysts and associates) typically earn base salaries of $85,000 to $125,000 at major banks, with bonuses that can equal or exceed the base in strong years. Senior traders and desk heads at top-tier firms can reach total compensation well into seven figures, driven mainly by the bonus, which reflects the desk’s profitability. FICC and equity derivatives desks tend to pay more than cash equities, where electronic trading has compressed margins. The bonus-heavy structure also means a bad year for the desk lands directly on your paycheck, which is part of why the job carries the intensity it does.