Blair Hull: The Card Counter Who Built an Options Empire

Last reviewed: August 2026. Sources: Jack Schwager’s The New Market Wizards, public interviews, and company records.

Blair Hull learned to trade at a blackjack table. For roughly five years in the 1970s he counted cards in Las Vegas casinos, treating the game not as gambling but as a disciplined exercise in probability: know when the odds favour you, bet bigger when they do, and survive the swings in between. He walked away from the tables with his winnings and carried the exact same logic onto the floor of a stock exchange.

There, his “card counting” became a set of computer-generated sheets telling him what every option was truly worth. Where the market’s price differed from his model’s value, he had an edge — and he pressed it, over and over, across millions of trades. That single idea grew into Hull Trading Company, one of the first great electronic market-making firms, which Goldman Sachs bought in 1999 for $531 million. Hull is the Wizard who proved that a genuine, quantifiable edge, industrialised by technology and a brilliant team, can be one of the most powerful forces in markets.

From the casino to the exchange floor

Hull’s interest in markets started early — he traces it to watching his grandfather chart stocks and finding the idea of capital working for you appealing. He studied business, worked briefly as a security analyst, and was laid off within months when a bear market wiped out his department. A few jobs later, he discovered blackjack.

He read Ed Thorp’s Beat the Dealer, the book that showed card counting could give a disciplined player a mathematical edge over the house, and became a serious, skilled player for about half a decade. Blackjack taught him the lesson that would define his career: an edge is a small, statistical advantage, and the way you profit from it is to identify it precisely, bet in proportion to it, and survive the variance long enough for the math to play out.

He left the tables with roughly $25,000 and leased a seat on the Pacific Stock Exchange. In the late 1970s he built his own empirical option-pricing model — independently, and, remarkably, without being aware of the Black–Scholes work being published at the same time. The model produced sheets of theoretical values: for any given stock price, what each option was really worth. When the floor’s price differed from his sheet, Hull bought or sold to capture the gap. It was card counting, transplanted to options.

The method: industrialise the edge

Hull’s genius was not just finding an edge but scaling it. In 1985 he founded Hull Trading Company and did something almost unheard of on a trading floor: he hired PhDs, mathematicians, physicists — many recruited from Fermilab — and, eventually, close to a hundred software engineers. He saw before most that computers would lead to automated exchanges and mathematically priced securities, and he built the firm to live in that future.

The result was a machine. Hull Trading became a global leader in applying computer technology to listed markets, setting bid and ask prices across dozens of exchanges. At its height the firm was active on 28 exchanges in nine countries, executed on the order of 7% of all U.S. index options, and traded around 1% of the shares moving on the New York Stock Exchange — a scale that other American market-makers repeatedly tried and failed to reach overseas.

Every trade earned only a tiny theoretical edge. The empire was built by doing it a staggering number of times, with the losses on any single trade kept small by the model and the diversification of thousands of simultaneous positions. This is the quiet truth of market-making: no heroic calls, just a small, real advantage repeated at industrial scale.

The defining lesson: know your edge, then survive the game

Hull’s whole career reduces to a three-part discipline he carried from the casino. Find the edge — understand exactly where your advantage comes from and how large it is. Exploit the edge — bet in proportion to it, hardest when it is biggest, and build a system to press it consistently. And survive the game — because even a genuine edge loses often, and staying solvent through the variance is what lets the advantage compound.

He also believed edges are best captured by teams. Hull did not try to be the smartest person in every discipline; he hired people who were, and built an organisation around the advantage. When Goldman Sachs bought the firm, its executives reportedly said it would have taken them two years to build something equivalent — and by then Hull would have been two years further ahead. That was the value of the machine he had built.

Where the Mind · Method · Money framework meets Hull

Method is the model: a proprietary, quantitative valuation of options, executed by technology, that identified mispricings and captured them systematically. It is one of the purest examples of an edge that is measured rather than felt.

Money is the market-maker’s discipline. Each position carried only a small, defined risk; diversification across thousands of trades and a model-driven approach kept any single loss trivial. Betting in proportion to the size of the edge — straight from blackjack — is position sizing at its most rigorous.

Mind is the probabilistic temperament. Treating trading as a game of edge and variance rather than prediction, staying disciplined through inevitable losing streaks, and having the humility to hire people smarter than himself all reflect a mindset built on math, not ego.

The honest counterweight

Hull’s achievement is monumental, but it is also the least copyable story in the Wizards canon, and it is important to say why.

His edge was fundamentally institutional. It required a proprietary pricing model, cutting-edge technology, a small army of physicists and engineers, and enough capital to make tiny per-trade edges add up to a fortune. This is not a strategy an individual at a screen can replicate; it is a business, built by a founder-CEO, that happened to trade. Reading Hull as a template for personal trading misses the point entirely.

The specific opportunity has also largely closed. The fat, exploitable spreads Hull captured on the exchange floors of the 1980s and 1990s were competed away by exactly the electronic and high-frequency trading his own firm helped pioneer. Market-making today is a razor-thin, technology-arms-race business dominated by a handful of giants. Hull himself moved on to entirely different edges — a tactical ETF, macro models — which tells you the original one had a shelf life.

Even the romantic blackjack-to-Wall-Street arc deserves a caveat. Card counting works because a deck has fixed, known probabilities; markets do not. What transferred was the mindset — sizing to edge, surviving variance — not the literal method. And the ultimate move of Hull’s career was to sell the machine to someone with deeper pockets. That is a superb business outcome, but it is a reminder that his success was as much about building and monetising a company as about any single trade.

What to actually take from Blair Hull

You cannot build Hull Trading, but you can adopt the thinking that built it.

First, bet in proportion to your edge. When your advantage is real and large, commit; when it is thin or absent, do very little. Sizing to edge, not to emotion, is the single most important habit he carried from the casino.

Second, survive the variance. Even a genuine edge produces losing streaks. Keeping individual losses small so no single outcome can knock you out is what allows an advantage to compound over time.

Third, systematise what works. Turn a repeatable advantage into a defined process or rule rather than trusting it to a good day’s judgment. Consistency is where the money is.

Fourth, expect edges to decay. Hull’s career is a chain of advantages, each eventually competed away, each replaced by a new one. Assume yours will erode and keep searching for the next.

Frequently asked questions

Who is Blair Hull?
Blair Hull is an American options trader and entrepreneur, profiled in Jack Schwager’s The New Market Wizards. He founded Hull Trading Company, a pioneering electronic options market-making firm that Goldman Sachs acquired in 1999 for $531 million.

How did blackjack lead Blair Hull to trading?
After reading Ed Thorp’s Beat the Dealer, Hull spent years as a disciplined card counter, learning to identify a statistical edge, bet in proportion to it, and survive the swings. He took his winnings to the Pacific Stock Exchange and applied the same probabilistic logic to mispriced options.

What was Hull Trading Company?
Founded in 1985, it was one of the world’s first great computerised options market-making firms. Staffed with physicists, mathematicians and software engineers, at its peak it operated on 28 exchanges in nine countries and handled roughly 7% of U.S. index-options volume before Goldman Sachs bought it.

What was Blair Hull’s edge?
An empirical option-pricing model he built himself, producing theoretical-value sheets that told him what each option was truly worth. When market prices diverged from those values, he traded to capture the difference — a small edge repeated across enormous volume and automated by technology.

What is Blair Hull’s trading philosophy?
It is often summed up in three steps: know your edge, exploit your edge, and survive the game. Understand precisely where your advantage lies, bet in proportion to it, and manage risk so you outlast the inevitable losing streaks — ideally with a strong team behind you.

Can an individual trader copy Blair Hull?
Not directly. His edge was an institutional one built on proprietary models, technology, talent and capital. What individuals can borrow is the mindset: size to your edge, keep losses small, systematise what works, and expect your advantage to decay over time.

Which book features Blair Hull?
The New Market Wizards (Jack Schwager, 1992).

Continue learning

• Edward Thorp — the mathematician whose blackjack book, Beat the Dealer, first set Hull on his path.
• Jeff Yass — the poker-minded options market-maker who thinks in the same probabilistic, edge-and-sizing terms.
• Jim Simons — the mathematician who, like Hull, hired physicists to hunt edges by computer.
• Market Wizards (book review) — our breakdown of the Schwager series Hull appears in.
• The Mind · Method · Money framework — the lens we use to read every trader on this site.