How to Stop Overtrading (And What’s Actually Driving It)

TL;DR: Research from Barber and Odean at UC Berkeley found that the most active traders underperformed the market by more than 6% annually after costs, while less active traders nearly matched it. But the harder question is why traders keep overtrading even when they know the math. The answer isn’t a lack of discipline. In my experience, it’s the pull of anticipation, tiredness from making decision after decision, and a deep human bias toward doing something. This guide explains what’s going on and what helps.

Here’s the thing about overtrading that most coaching content misses: it doesn’t feel like overtrading when it’s happening.

It feels like opportunity. It feels like engagement. It feels like you’re doing something. You’re watching, scanning, reacting. Every new setup that forms looks plausible. Every moment you’re not in a trade feels like potential profit left on the table.

After 20 years coaching traders, I can tell you that this feeling is not simply a willpower problem. Your body is part of it. And the most honest thing I can do is explain what’s creating it, because until you understand the mechanism, every “just be more disciplined” advice you get will fail the same way willpower does, right when you need it most.

What the Data Says About Overtrading

First, the numbers.

Brad Barber and Terrance Odean’s landmark study “Trading Is Hazardous to Your Wealth”published in The Journal of Finance (2000), analyzed 66,465 households at a large discount brokerage. Their finding: the more households traded, the lower their returns after costs.

The least active traders nearly matched the market. The most active traders significantly underperformed, not because of bad stock selection, but because of transaction costs compounding against enormous turnover. The most active households turned over their entire portfolio multiple times per year, generating a performance penalty that wiped out their gross returns and then some.

The pattern held across global markets. Studies of Taiwanese investors found something similar: individual investors as a group lost significant capital annually to overtrading. The highest-frequency traders could spot opportunities, but they couldn’t overcome the friction created by their own behavior. Here’s the counterintuitive part: the most active traders in the Barber and Odean sample often showed gross returns that slightly beat the market before transaction costs. Their stock picking wasn’t terrible. Their frequency was killing them.

If knowing the numbers were enough to stop overtrading, a lot more traders would have stopped. Which tells me the numbers aren’t the problem. What’s driving the behavior is.

Why Your Brain Keeps Pressing the Button

The judicial parole system is not an obvious place to look for trading psychology research. But a 2011 study published in PNAS by Danziger, Levav, and Avnaim-Pesso is one of the most famous illustrations of what may happen to decisions under sustained load.

The researchers analyzed 1,112 parole rulings by experienced judges across three daily sessions separated by food breaks. At the beginning of each session, favorable parole rulings occurred approximately 65% of the time. By the end of each session, the rate dropped to nearly zero. After each break, it jumped back to about 65%. Other researchers have questioned how much of that came from tiredness and how much from the order cases were heard, so it isn’t settled. But the pattern is striking.

The judges weren’t changing their standards consciously. They were experiencing decision fatigue. The researchers’ explanation: when you’re worn down, you tend to fall back on the simplest, lowest-effort choice. In a parole context, that default is “no” (denying release). Saying no keeps things as they are.

For a trader whose habituated default is “find a trade,” a tired brain may do exactly that. Not because the setup is there. Because “find a trade” is the path of least cognitive resistance after 90 minutes of active session management.

Other studies of courts have looked for the same pattern with mixed results. In my coaching, though, I see it all the time: traders make their worst decisions when they’ve been at the screen too long.

In my experience, a lot of overtrading happens in the second half of the session, when you’ve been making decisions for hours and fall back on your most familiar habit. When overtrading becomes a persistent pattern rather than an occasional lapse, it’s worth checking whether it’s crossed into overtrading as a sign of trading burnouta different problem with different recovery requirements.

Willpower alone may not fix this. The part of you that would exercise willpower is the part that’s tired.

This is the core insight behind building trading discipline that holds under pressure, and why emotional regulation has to involve your body, not just your intentions.

Dopamine Is the Anticipation Chemical

Here’s something that’s easy to get wrong.

Dopamine is widely described as the “pleasure” neurotransmitter. But studies of the brain’s reward system suggest it’s more about anticipation and wanting than the reward itself. In animal studies, the response was strongest when a reward was possible but uncertain.

For traders, that pull can show up while:

• Scanning for a setup (anticipating a potential opportunity)
• Entering a trade (relief from the tension of waiting)
• Watching a position where the outcome is uncertain (ongoing anticipation)
• After exiting (dopamine drop, followed immediately by the urge to re-enter)

This can create a loop. Searching for a trade can feel rewarding whether or not you find a good one. Gambling studies suggest near-misses can be especially compelling, and an almost-valid setup may work the same way.

The pull toward something new is part of it too. In trading, I see it show up as:

• Dropping to lower timeframes to find “more happening”
• Opening new charts in unfamiliar instruments
• Acting on setups outside your defined playbook
• Feeling genuine boredom during valid but quiet setups

That boredom is not a personal failing. In a slow, legitimate market phase, boredom can be a sign you’re doing it right, not evidence that you need to find something to do.

One of my favorite observations from 20 years of coaching: traders who describe their sessions as “boring” are often the profitable ones. The traders who describe markets as “exciting” are often the ones overtrading.

The Action Bias: Why Doing Nothing Feels Wrong

Sitting “flat”, holding no position during market hours, creates a specific psychological discomfort that has been studied across multiple contexts.

Daniel Kahneman’s “System 1” thinking framework describes the brain’s preference for fast, intuitive responses over slow, analytical ones. In survival environments, action was often safer than deliberation. Research by Patt and Zeckhauser found that individuals feel compelled to “do something” in response to uncertainty or discomfort even when doing nothing would be better.

In trading, being flat during volatile market movement creates an almost physical pressure. The action bias turns it into a problem of control: by entering a trade, the brain experiences the illusion of agency. The trade may have no statistical edge. The relief is still real.

Studies of retail investors keep finding the same thing: the more people trade, the worse they tend to do after costs.

For many traders, the impulse to act is not neutral. It costs money.

When You Trade Matters as Much as How Often

A final, often ignored driver of overtrading: circadian biology.

Research published in Experimental Economics looked at “circadian mismatch”: people trading at a time of day that’s out of step with their body clock. In a lab market experiment, sessions with more out-of-sync participants showed more mispricing.

Another study used sunset times on either side of time-zone borders as a stand-in for how much people sleep. Investors on the side where people likely slept less tended to earn lower returns. It’s an indirect measure, but it points the same way.

The midday period deserves specific attention. Firms like SMB Capital have encouraged traders, particularly those trading momentum, to step away from the screen during the 11:30 AM–2:00 PM ET window, not as a motivational suggestion but as a structural safeguard. Volume typically contracts, price action becomes more rotational, and the absence of clear opportunity increases the likelihood of boredom-driven overtrading.

This is the same principle behind Celeste Headlee’s work (discussed on The Wall Street Coach Podcast, Episode 19): your mind has limits, and respecting them is part of performing well.

Podcast Episode 19

Working Ourselves to Death with Celeste Headlee

Discussing cognitive performance ceilings and why “doing nothing” is a critical requirement for high-level decision makers.

What Actually Stops Overtrading

Willpower is the wrong tool. Here’s what works.

Before the tactics: one reframe that changes everything. I tell every serious trader I coach that they need to start seeing themselves as the athletes they actually are. You are competing in one of the most cognitively demanding environments on the planet, against institutional players with significantly more capital, data, and technology. The one controllable advantage you have is how you show up physically and mentally. That means sleep. That means stepping away from the screen when your biology says to, not when the market gives you permission. The midday break is not lost time. It is maintenance on the most important equipment in your performance stack: your brain. We built the free Trader Check-In specifically to help traders log that exact maintenance, perform daily resets, and keep their execution aligned with their process instead of their impulses.

1. Structural Friction (Remove the Permission, Not Just the Urge)

If the account allows another trade, a depleted brain will take it. The solution is not trying harder to resist, it is removing the permission structurally.

Practical implementations:

• Before the session, decide what you’ll do when you notice yourself getting wound up: stand, exhale, feel your feet
• Platform set to require confirmation steps before entry (adds friction to impulsive clicks)
• Session ends at a fixed time, not “when I feel done”
• Written pre-market plan specifying exact conditions for entry, any setup not in the plan is automatically out

The core principle: the pre-session version of you, calm and clear-headed, sets the rules. The mid-session version of you, tired and pulled by anticipation, works within those rules without being asked to re-decide them under pressure.

2. The Playbook Model (SMB Capital’s Operational Framework)

SMB Capital’s approach to overtrading is instructive because it treats the problem operationally rather than motivationally. Key elements:

• Traders operate from a defined “Playbook” of setups and only take trades when market conditions align with a specific playbook entry
• Newer traders keep a short watchlist rather than chasing everything that moves
• Success is measured not by P&L but by “One Good Trade”, adherence to process regardless of financial outcome

This process-over-outcome framing changes what feels rewarding. Instead of chasing the anticipation of profit, which fuels the overtrading loop, the reward becomes following your process. That shift doesn’t happen overnight, but it marks the transition from Force to Power that I see in the traders who move past overtrading for good.

3. What “Doing Nothing” Actually Is

The frame of “doing nothing” when not trading misidentifies what’s happening.

When a trader is watching the market, evaluating setups, and choosing not to trade because nothing meets their criteria, they are working. They are making repeated, high-quality decisions under uncertainty, which is cognitively demanding. The output is absence of entries, not absence of effort.

The practice I give traders: instead of trying not to trade, commit to writing one sentence about what you observe every 15 minutes you choose not to trade. “The market is choppy with no clear follow-through, not my setup.” That transforms “waiting” into active analysis, gives the action bias a legitimate outlet, and builds the psychological data set that will eventually reveal your own patterns.

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Frequently Asked Questions

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Kim Ann Curtin, known as The Wall Street Coach™, is a trading psychology and performance coach who works at the intersection of decision-making and the nervous system. For over 20 years, she has worked with institutional traders, hedge funds, and senior executives. Her clients include traders and executives affiliated with firms such as GIC, Morgan Stanley, Bank of America, King Street Capital, BC Partners, and Blackstone, along with leading trading communities including Investors Underground, Bear Bull Traders, True Trader, and StocksToTrade. She has also coached traders and leadership teams at CenterPoint Securities. She is the author of Transforming Wall Street and host of The Wall Street Coach Podcast (110+ episodes), focused on helping traders perform at a high level when it matters most.