Trading Education Center

📚 What is Post-Earnings Drift?

Post-Earnings Announcement Drift (PEAD) is one of the most studied and persistent market anomalies. When companies report earnings that surprise the market, their stock prices tend to continue drifting in the direction of the surprise for weeks or even months after the announcement.

• Positive surprise → Stock drifts higher over following weeks
• Negative surprise → Stock drifts lower over following weeks

This happens because the market takes time to fully digest and price in the new information. Institutional investors often can't trade immediately due to size constraints, creating a gradual drift.

🎯 Understanding SUE (Standardized Unexpected Earnings)

SUE is the gold standard for measuring earnings surprises. It's calculated as:

Why SUE matters:

• SUE > 2.0: Strong positive surprise → BUY signal
• SUE < -2.0: Strong negative surprise → SHORT signal
• -2.0 to 2.0: Neutral zone → SKIP (no edge)

SUE standardizes surprises across different companies, making a 5% surprise in a stable utility comparable to a 5% surprise in a volatile tech stock.

📈 How to Trade the Signals

Entry Timing

• Day 1-2: Initial reaction period - often too volatile
• Day 3-7: Sweet spot for entry - initial volatility settled
• After Day 10: Drift may be largely captured

Position Sizing

Never risk more than 1-2% of your account on any single trade:

• $10,000 account: Risk $100-200 per trade
• $50,000 account: Risk $500-1,000 per trade
• $100,000 account: Risk $1,000-2,000 per trade

Stop Loss Placement

• Stocks: 3-5% stop loss from entry
• Options: 30-50% stop on premium paid
• Trail stops after 5-10% profit to protect gains

Profit Targets

• Conservative: Exit at 5-7% profit
• Standard: Exit at 10-15% profit
• Aggressive: Trail stop, aim for 20%+

🎯 Options vs Stock Expression

When to Use Stock

• Account under $25,000 (avoid PDT rules)
• Lower confidence signals (SUE between 2.0-3.0)
• Volatile market conditions
• Planning to hold 2-4 weeks

When to Use Options

• High confidence signals (SUE > 3.0)
• Want leverage with defined risk
• Expecting quick move (1-2 weeks)
• Account over $25,000

Options Strategy

• Timeframe: 30-45 DTE minimum
• Strike: ATM or slightly OTM (1-2 strikes)
• Greeks: Delta 0.40-0.60 preferred
• Avoid: Weekly options (too much decay)

⚠️ When to SKIP Signals

Not every signal should be traded. Skip when:

• Market conditions: SPY in strong downtrend
• Sector weakness: Stock's sector is collapsing
• Low volume: Average volume under 500K shares
• Penny stocks: Price under $5 (too manipulated)
• Binary events: FDA approval, merger pending
• Already moved: Stock already up/down 15%+ since earnings

💡 Pro Tips from Successful Traders

1. Quality over quantity: Better to take 2-3 high-confidence trades than 10 mediocre ones
2. Journal everything: Track your trades, what worked, what didn't
3. Respect stops: Never average down on a losing drift trade
4. Scale in: Start with 50% position, add on confirmation
5. Morning entries: Best liquidity 30-60 min after open
6. Avoid Fridays: Weekend risk can disrupt drift patterns
7. Watch the SPY: When market tanks, even good drifts fail

📊 Real Example

❓ Common Mistakes to Avoid

• Chasing: Don't enter after stock already moved 10%+
• Oversizing: One bad trade shouldn't damage your account
• Ignoring market: Best drifts fail in bear markets
• Too early: Day 1 is often a fake-out
• No plan: Know your entry, stop, and target BEFORE trading
• FOMO: Missing a signal is better than forcing a bad trade

🎓 Recommended Learning Path

1. Week 1: Paper trade every signal to learn the patterns
2. Week 2-3: Start with 25% normal position size
3. Month 2: Scale to 50% size once profitable
4. Month 3+: Full size only after 20+ successful trades

Remember: Post-earnings drift is a statistical edge that plays out over many trades. No single trade matters - focus on executing the system consistently.