Mean Reversion Strategy - Journal Guide
Mean reversion trading bets that prices stretched far from their average will snap back, entering when assets are statistically overextended.
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Stocks, Futures
Swing
Intermediate
Entry & Exit Rules
Entry Rules
- Price is 2+ standard deviations from 20-day mean
- RSI below 25 (long) or above 75 (short)
- No major catalyst driving the extreme move
- Broader market is not in a strong trend against the trade
Exit Rules
- Target the 20-day moving average (mean)
- Stop-loss at 3 standard deviations from mean
- Time stop: exit if no reversion within 5 trading days
- Take partial profits at 1 standard deviation reversion
Key Metrics to Track
What to Record
Risk Management
Risk 0.75% of account per trade since mean reversion trades can experience significant adverse excursion before reverting. Always use a time stop to avoid holding positions that fail to revert. Avoid mean reversion trades during earnings or major economic events.
What Is Mean Reversion?
Mean reversion is based on the statistical principle that prices tend to return to their average over time. When a stock drops 15% in two days without a fundamental catalyst, it’s likely stretched too far and will bounce. When it rallies 20% on hype alone, gravity eventually pulls it back.
This strategy requires patience and discipline. You’re buying when others are panicking and selling when others are euphoric.
The Statistical Edge
Mean reversion works because of market microstructure:
- Overreaction to short-term news creates temporary mispricings
- Algorithmic trading pushes prices beyond fair value, then corrects
- Liquidity gaps cause exaggerated moves that fill once activity normalizes
The edge is measurable. Stocks 2+ standard deviations from their 20-day mean revert to the mean approximately 65-70% of the time when no catalyst is present.
When to Avoid Mean Reversion
Not every stretched price reverts. Recognizing when to stay away is as important as knowing when to enter:
- Earnings surprises fundamentally change the stock’s value
- Sector-wide moves suggest a regime change, not an overreaction
- Sustained high volume in the direction of the move indicates real conviction
Your journal should track these factors so you can refine your filter for when mean reversion applies and when it doesn’t.
Journaling Mean Reversion Trades
The critical fields for mean reversion are:
At Entry
Record the exact statistical stretch (standard deviations, RSI reading, distance from MA). This becomes your most important variable for analysis.
During the Trade
Note whether the position experiences further adverse excursion before reverting. Understanding the typical drawdown path helps you set appropriate stops.
At Exit
Did price reach the mean? Did you exit early? Was the time stop triggered? Each scenario teaches you something different.
Building a Mean Reversion System
After 40+ trades, your journal reveals the optimal parameters for your markets:
- Which SD threshold produces the best risk-adjusted returns
- Whether certain sectors revert more reliably
- Whether time of week or month affects reversion speed
This data transforms mean reversion from a vague concept into a quantified system with a proven edge.
How JournalPlus Helps
Strategy Tagging
Tag every trade with this strategy and track win rate, expectancy, and P&L by strategy over time.
Rule Compliance
Log whether you followed entry and exit rules. Spot when rule-breaking costs you money.
Performance Analytics
See which market conditions produce the best results for this strategy with automatic breakdowns.
Mistake Detection
AI flags pattern-breaking trades so you can stay disciplined and refine your edge.
What Traders Say
"Tracking the standard deviation at entry showed me I was entering too early. Waiting for 2.5 SD instead of 2 SD improved my win rate from 55% to 72%."
Frequently Asked Questions
When does mean reversion fail?
Mean reversion fails during strong trending markets or when a fundamental catalyst permanently changes the asset's value. That's why it's crucial to avoid mean reversion trades when there's a clear news catalyst driving the move.
What indicators work best for mean reversion?
Bollinger Bands, RSI, and the distance from a moving average are the most common tools. The key is measuring how far price has stretched from its statistical norm.
How long should I hold a mean reversion trade?
Most mean reversion trades resolve within 3-5 trading days. If price hasn't started reverting within that window, the thesis may be wrong and you should exit via your time stop.
Start Tracking Your Trades
Journal every trade, track your strategy performance, and find your edge with JournalPlus.
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