Follow-Through Day (FTD) Methodology
Overview
The Follow-Through Day (FTD) is William O'Neil's market timing signal for confirming a new uptrend after a correction. It is the single most important signal for re-entering the market after a decline. Without an FTD, no new bull market or sustained rally has ever begun (per IBD historical analysis).
Key Insight: FTD is a necessary but not sufficient condition. Historically, approximately 25% of FTDs lead to sustained uptrends. The remaining 75% fail, which is why quality scoring and post-FTD monitoring are critical.
Step 1: Identify the Correction
Qualifying Correction
A correction must meet these criteria before FTD analysis begins:
- Decline magnitude: Index closes 3% or more below its recent high
- Duration: At least 3 down days during the decline
- Index scope: S&P 500 and/or NASDAQ Composite (either suffices)
Swing Low Definition
The swing low is the lowest closing price during the correction that becomes the reference point for the rally attempt:
- Must be preceded by 3%+ decline from a recent high (within 40 trading days)
- Must have at least 3 down days between the high and the low
- Must be a local minimum (adjacent days have higher closes)
- Multiple swing lows can occur; use the most recent qualifying one
Important: The swing low is determined by closing price, not intraday low.
Step 2: Rally Attempt (Day 1-3)
Day 1 Detection
Day 1 marks the beginning of a rally attempt. It occurs on the first qualifying up day after the swing low:
Primary criterion: Close > Previous day's close (up day)
Alternative criterion: Close in the top 50% of the day's price range
- Formula: (Close - Low) / (High - Low) >= 0.50
- This captures days where the market recovers significantly from intraday lows even if it doesn't close above the prior day's close
Day 2-3 Integrity Check
For the rally attempt to remain valid through Day 2-3:
- Close must not breach Day 1's intraday low (not the close, the low)
- This is a strict rule; even a single day closing below Day 1's low invalidates the attempt
- Day 2 and Day 3 do NOT need to be up days; they just cannot close below Day 1's low
Rally Invalidation (Reset)
The rally attempt resets completely if:
- Any day's close falls below the swing low price → Start over from new potential swing low
- Day 2 or Day 3 closes below Day 1's intraday low → Wait for new Day 1
When a rally resets, the new lower price may become the new swing low, and the cycle begins again.
Step 3: FTD Window (Day 4-10)
FTD Qualification Criteria
A Follow-Through Day must satisfy ALL of these conditions:
- Day 4-10 of the rally attempt (Day 4-7 is the prime window; Day 8-10 still valid)
- Price gain >= 1.25% (minimum threshold)
- 1.25-1.49%: Minimum qualifying gain
- 1.50-1.99%: Recommended gain (higher reliability)
- 2.00%+: Strong signal
- Volume > previous day's volume (mandatory)
- This confirms institutional participation
- Volume does not need to exceed the 50-day average, though it's a positive if it does
Day Counting Rules
- Day 1 = first qualifying up day after swing low
- Day 2, 3, etc. = every subsequent trading day (regardless of whether it's up or down)
- Days count continues as long as the rally is not invalidated
- The FTD itself must be an up day meeting the gain and volume requirements
Prime vs Late Window
Day 4-7 (Prime):
- Historically higher success rate
- Base quality score: 60 points
- Institutional buyers are more likely to have conviction
Day 8-10 (Late):
- Still valid but statistically weaker
- Base quality score: 50 points
- May indicate hesitant institutional buying
After Day 10:
- No longer qualifies as a traditional FTD
- Rally without FTD by Day 10 is a warning sign
- May still develop into an uptrend but reliability drops significantly
Step 4: Dual-Index Confirmation
Single-Index FTD
An FTD on either the S&P 500 or NASDAQ is sufficient to trigger the signal. The signal is actionable on a single-index confirmation.
Dual-Index FTD
When both S&P 500 and NASDAQ produce FTDs (within a few days of each other):
- Significantly higher reliability
- Quality score bonus: +15 points
- Indicates broader institutional conviction
- Both growth and value participants are buying
Index Discrepancy
When one index confirms FTD but the other is still in rally attempt or correction:
- FTD is still valid from the confirming index
- Monitor the lagging index for convergence or divergence
- Divergence (one fails while other holds) is a cautionary signal
Quality Score Framework
Score Components (0-100)
| Factor | Criteria | Points |
|---|---|---|
| Base (FTD Day) | Day 4-7 | 60 |
| Day 8-10 | 50 | |
| Price Gain | >= 2.0% | +15 |
| >= 1.5% | +10 | |
| >= 1.25% | +5 | |
| Volume vs 50-day Avg | Above average | +10 |
| Below average | +0 | |
| Dual Index Confirm | Both S&P 500 + NASDAQ | +15 |
| Single index | +0 | |
| Post-FTD Health | No distribution (5 days) | +10 |
| Distribution Day 4-5 | -5 | |
| Distribution Day 3 | -15 | |
| Distribution Day 1-2 | -30 |
Interpretation
| Score | Signal | Recommended Exposure |
|---|---|---|
| 80-100 | Strong FTD | 75-100% equity |
| 60-79 | Moderate FTD | 50-75% equity |
| 40-59 | Weak FTD | 25-50% equity |
| < 40 | No FTD / Failed | 0-25% equity |
Historical FTD Examples
March 2020 (COVID Crash)
- Swing Low: March 23, 2020 (S&P 500: ~2,237)
- Day 1: March 24, 2020 (+9.4%)
- FTD: April 2, 2020 (Day 8 of rally, +2.3% on higher volume)
- Outcome: Successful - began one of the strongest bull markets in history
- Quality: Moderate (Day 8 = late window, but strong gain and volume)
- Note: Multiple failed rally attempts preceded this successful one
October 2022 (Bear Market Bottom)
- Swing Low: October 13, 2022 (S&P 500: ~3,491)
- Day 1: October 14, 2022 (+2.6%)
- FTD: October 21, 2022 (Day 6, +2.4% on higher volume)
- Outcome: Successful - confirmed the end of the 2022 bear market
- Quality: High (Day 6 = prime window, strong gain, above-avg volume)
June 2022 (Failed FTD)
- Swing Low: June 17, 2022 (S&P 500: ~3,666)
- FTD: Late June 2022
- Outcome: Failed - market made new lows by September 2022
- Lesson: FTD occurred but distribution days followed quickly; market environment (rising rates, inflation) was hostile
December 2018 (Christmas Eve Low)
- Swing Low: December 24, 2018 (S&P 500: ~2,351)
- FTD: January 4, 2019 (Day 6, +3.4% on higher volume)
- Outcome: Successful - powerful rally through 2019
- Quality: Very high (prime window, strong gain, Fed pivot as catalyst)
Common Mistakes
- Buying before FTD confirmation: Acting on Day 1-3 before FTD is confirmed
- Ignoring volume: A large gain without volume increase is NOT an FTD
- Counting wrong: Including non-trading days or resetting day count incorrectly
- Single vs. dual index: Treating single-index FTD as equivalent to dual-index
- Ignoring post-FTD distribution: Not monitoring for early distribution days
- FTD ≠ all clear: Treating FTD as guarantee rather than probability shift