Tom Basso: why "Mr. Serenity" cared more about exits
What if you picked your trades by flipping a coin? In the 1990s, trend follower Tom Basso and trading coach Van Tharp tested that idea on past prices. The answer surprised people, and it changed how many traders think about entries.
Who they were
Tom Basso is an American trader who ran money professionally for about two decades. He trained as an engineer, then got interested in markets in the 1970s.
He became a registered investment adviser in 1980. In 1984 he set up Trendstat Capital Management, which traded futures and currencies as well as stock funds.
His style is called trend following. In plain words: when a market starts moving strongly in one direction, you join that move, and you get out when it turns. You don't predict. You follow.
What happened
1980s. Trendstat grew. Basso wrote his trading rules into computer programs, so the same rules ran the same way every day.
1992. Jack Schwager interviewed him for The New Market Wizards. The chapter called him "Mr. Serenity." Next to stories of nerve-racking trades, Basso stood out for how calm he was. He described a business built so that no single day or trade could upset him.
1990s: the coin-flip test. At a 1991 seminar, Basso said his edge came mostly from his exits and how he sized positions, not from his entries. Van Tharp, a trading coach, decided to test the claim.
The test, as it's usually described:
- Entries were random, as if by coin flip: long or short.
- The exit was a Trailing stop set at 3 times the ATR (the average daily range of price), which moved only in the trade's favour.
- Each trade risked about 1% of a test account.
- It ran on past prices in 10 futures markets.
By the accounts of those involved, the random-entry version still made money in the test. The point wasn't "trade randomly." It was that exits and size carried far more weight than people assumed.
1994. He published Panic-Proof Investing.
2003. He retired from managing other people's money and closed Trendstat. He's since kept trading his own account and shares his views through books, podcasts and a free website.
The moment everyone remembers
The coin-flip test is the famous part. It sounds like a trick: random entries that still worked on paper.
Here's what it actually shows. A trend follower loses on many trades. What matters is that losers are cut at a set point and winners are allowed to run. Add a fixed small risk per trade, and the entry becomes the least important part.
That's also why Basso was calm. If you know the most any trade can cost you, there's much less to worry about.
Treat the coin-flip test as a lesson about exits, not a strategy. It was a hypothetical test on past prices, and results like that can look very different with real costs and today's markets.
What it teaches
1. Spend more time on your exit than your entry
Most beginners hunt for the perfect entry signal. Basso's work suggests the exit matters more.
Write your exit rule first. Where's the stop? When does it move? See how to set a stop-loss and trailing stop vs stop loss.
2. Size is the quiet engine
In the test, each trade risked about 1%. That kept losing streaks survivable.
Same rule for you: decide the slice of your account you'll risk, then let the stop set the size. A 1% risk on a 10,000-unit account is 100 units. With a stop 4 units away, the size is 25. A math example, not a promise. Use the position size calculator.
3. Calm comes from design
Basso didn't become calm by willpower. He built rules so that no single trade could hurt much. Then calm followed.
A fixed routine helps the same way. See trading routine and daily loss limit.
4. Test ideas on past charts before trusting them
Tharp didn't argue with Basso's claim. He tested it. You can do a small version on bar replay: pick an exit rule, try it on 20 past setups, and log every result. See how to backtest a trading strategy.
What it doesn't mean
It doesn't mean entries don't matter at all. Random entries add noise, and most traders do better with a clear reason to enter: a level, a trend, a closed candle.
It doesn't mean trend following always works. It tends to lose in choppy, sideways markets, sometimes for long stretches.
And it doesn't mean a hypothetical test predicts real results. Backtests can miss costs, slippage and how it feels to sit through a losing run.
Timeline
| Year | What happened |
|---|---|
| 1980 | Becomes a registered investment adviser |
| 1984 | Founds Trendstat Capital Management |
| 1991 | Says at a seminar that exits and sizing drive his results |
| 1992 | Profiled as "Mr. Serenity" in The New Market Wizards |
| 1990s | Coin-flip test with Van Tharp on 10 futures markets |
| 1994 | Publishes Panic-Proof Investing |
| 2003 | Retires from managing client money |
Questions
Why is Tom Basso called Mr. Serenity?
Jack Schwager gave him the nickname in The New Market Wizards (1992) because of how calm he was about trading, thanks to rules that kept any one trade from hurting much.
What was the Tom Basso coin flip experiment?
A 1990s test with Van Tharp on past prices in 10 futures markets. Entries were random, exits used a trailing stop of 3 times ATR, and each trade risked about 1%. By their accounts it still made money, which suggested exits and sizing matter more than entries.
Does random entry trading really work?
The test was hypothetical and on past data. It showed how much exits and size matter, not that random entries are a good plan. Real costs and different markets can change the result.
What is trend following?
A style where you join a strong move after it starts and exit when it turns, instead of predicting tops and bottoms. It often has many small losses and fewer, larger wins.
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