Invisible Hands of The Exchange: The Market Making Arm
By Nadine Yip
Market makers are the invisible hands of the exchange. Why?
Market makers are the traders who keep exchanges alive, standing ready to buy or sell when others hesitate. At QTE, it’s where the thrill of competition meets the discipline of real‑world trading. Picture this, you’re playing an RPG with an auction house. Players list items and hope someone bites, but imagine there’s an NPC trader who’s always there and ready to buy your sword for 95 gold or sell you one for 105. That little gap, the 10 gold, is called the bid-ask spread, and is how the NPC makes a living while keeping the economy flowing. QTE’s Market Making Arm works in the exact same way. But it’s not as simple as “buy low, sell high.” Maybe someone eagerly buys from you at 105 because they know a new quest makes swords essential and they are about to skyrocket in value. Suddenly, you’re left with fewer swords or even a negative inventory. The price jumps and you’ll have to buy them back at a higher cost. This is risk of adverse selection. Market Making Teams not only step into the role of that NPC, posting both buy and sell prices so trading never stalls, they also manage risk by controlling how much inventory they hold. They are the exact key in-game NPC that affects the in‑game economy, earning the spread when deals go through, learning how to balance risk, manage inventory, and keep the market alive.
Now, let’s get into actual exchange details.
Behind every quote is a team in motion. Seven students form each Market Making Team: four quantitative analysts, and two software developers. Together, they drive the desk forward, just like a real trading floor.
As a team head, you are responsible for setting inventory the book aims to hold, and the limits it stays within to reduce risk. Usually aiming for a flat position, you will decide the quoting strategy across its assigned assets.
Quantitative analysts craft models to quote, determining the fair value, spread and skew while taking into account inventory, hedging and backtesting. For example, teams might tune a model on previous order book data to increase or reduce risk, searching for short-term signals.
Software Developers engineer and run the team’s operations.
Competition is the heartbeat of QTE’s Market Making Arm. With five teams in the play but only three allowed per asset, every bucket becomes a battleground. These buckets of assets are classified by class and sector, for example energy equities, FX ETFs, and each bucket goes to a fixed set of three teams. Assignments are balanced so every team gets a similar mix of easy and hard assets, while avoiding the same three teams competing against each other across multiple buckets. Buckets rotate once per academic term, allowing every team to gain experience across a variety of assets and competitors. Three teams race to post the sharpest prices, where the best quote wins the trade. It’s a constant duel. Tighter spreads mean more fills; wider spreads mean bigger margins. Every decision tilts the balance between profit and risk.
The exchange mechanics behind QTE’s Market Making Arm are designed to make trading feel realistic yet manageable. To achieve this, spreads are widened slightly, quotes delayed just enough to give students breathing room. Profit alone doesn’t just tell the whole story, sometimes it’s just luck. What they're really evaluated on is done using metrics like risk-adjusted PnL (Sharpe ratio), quote uptime (how often you had a valid two-sided quote), time spent at the best price, and fighting for fills against the other two teams.
Risk in the Market Making Arm is managed strictly by the exchange rules. Every team has hard caps, a maximum position they can hold in any single asset, and a cap on their whole book's exposure, so one bad model can't spiral out of control. As a team's inventory nears that limit, they're expected to adjust their prices to encourage trades that bring them back to a balanced position. There's also a daily drawdown limit, so if a team loses too much in a session, trading halts automatically and the team head is alerted. Plus, a one-click kill switch to cancel their entire book instantly if things go wrong.
In terms of obligations, teams must keep a valid two-sided quote live for most of the trading day, stay within a maximum spread, and meet a minimum quote size. Balancing these obligations against the hard caps, tightening up when inventory piles and loosening up when it's safe, is what separates a team that's actually managing risk from one that's just avoiding it.
To balance pricing and risk effectively, the Market Making Arm relies on a suite of trading tools. The core is a quoting interface, where traders steer their mid-price and spread, with one-click controls to widen, skew, or pull (cancel all) quotes. A hybrid control system lets an automated engine run the book by default, with traders able to step in and override specific assets. A live risk dashboard tracks inventory, exposure, and "markouts", whether trades look good or bad shortly after execution, a key signal of quoting quality. Most importantly, teams should also backtest strategies against historical book data before going live. A shared leaderboard would be tracking performance across teams. Together, these tools let the Market Making Arm operate like a real desk, quoting prices while actively managing risk.
Just like the NPC trader who keeps an RPG economy alive, the Market Making Arm is the engine the powers QTE. It turns a simple game of “buy and sell” into firsthand experience of how trade is kept alive, using different tools and skills that real quant firms rely on and drive real-world markets.