Why We Flagged NFLX but Only Watched WDC
How did NFLX (NFLX) and Western Digital (WDC) fare under JumpstartSignal's 5-stage screening pipeline across our full 2012–2025 walk-forward backtest? We flagged NFLX 1 time (1 signal day, first signal in 2024) and WDC 18 times (224 signal days, first signal in 2012). Every entry price, return, and SPY comparison below is from the frozen backtest snapshot.
📌 Note: WDC only ever reached our MONITOR watchlist tier, it was never promoted to a SPOTLIGHT or OPPORTUNITY buy signal. NFLX did reach SPOTLIGHT or OPPORTUNITY. That asymmetry is the story of this comparison.
Head-to-Head Stats
NFLX ✅ OPPORTUNITY NFLX ·
WDC 📌 MONITOR Western Digital · Technology
Per-Signal Returns
Each bar below shows the best return from one signal cluster, held from the entry date through Feb 1, 2026. The SPY return over the same period is shown alongside each entry, alpha is the gap between the two.
NFLX Signal Clusters
| Entry Date | Entry Price | Return | SPY Return | Alpha vs SPY |
|---|---|---|---|---|
| Sep 3, 2024 | $67.53 | +24% | +26% | -3% |
WDC Signal Clusters
| Entry Date | Entry Price | Return | SPY Return | Alpha vs SPY |
|---|---|---|---|---|
| May 10, 2012 | $24.45 | +923% | +545% | +378% |
| Aug 23, 2012 | $25.63 | +876% | +505% | +372% |
| Jan 18, 2013 | $27.54 | +809% | +479% | +329% |
| Jun 17, 2013 | $38.85 | +544% | +428% | +116% |
| Aug 12, 2013 | $42.29 | +492% | +403% | +88% |
| Oct 16, 2013 | $43.16 | +480% | +392% | +88% |
| Dec 4, 2013 | $48.30 | +418% | +371% | +47% |
| Jan 31, 2014 | $52.92 | +373% | +369% | +4% |
| Jun 18, 2014 | $58.31 | +329% | +327% | +2% |
| Aug 15, 2014 | $62.99 | +297% | +321% | -23% |
| Jan 12, 2015 | $70.02 | +257% | +308% | -50% |
| Sep 15, 2017 | $60.63 | +313% | +214% | +99% |
| Nov 6, 2017 | $60.51 | +314% | +202% | +112% |
| Mar 5, 2021 | $50.31 | +397% | +89% | +309% |
| Apr 5, 2021 | $54.44 | +360% | +80% | +279% |
| Apr 26, 2021 | $53.35 | +369% | +76% | +294% |
| Apr 17, 2024 | $52.55 | +376% | +39% | +338% |
| Aug 14, 2025 | $74.66 | +235% | +9% | +226% |
What This Teaches
Which stock a quant system picks more often says more about price-action shape than about the business. WDC kept printing clean SMA20/50 crossover + breakout-volume setups (18 distinct clusters over 14 years); NFLX printed them 1× in the same window. Same universe, same rules, different output, and that is exactly what a rules-based pipeline is supposed to produce.
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FAQ
Did JumpstartSignal ever buy WDC?
No. WDC only ever cleared our weekly MONITOR tier, a watchlist of stocks matching some but not all of our buy criteria. MONITOR signals are published for research context, not executed as trades; only SPOTLIGHT and OPPORTUNITY signals enter the backtested portfolio. NFLX, by contrast, did reach SPOTLIGHT or OPPORTUNITY in our pipeline; that asymmetry is the core story of this page.
Is NFLX or WDC a better momentum stock?
In our 14-year backtest, NFLX had an average alpha of -3% per signal versus +167% for WDC. NFLX produced 1 SPOTLIGHT or OPPORTUNITY buy-signal cluster vs 18 MONITOR watchlist clusters for WDC. Note the tier difference: MONITOR clusters are watchlist-only and were never promoted to buy signals, so cluster counts are not directly comparable across tiers.
When did JumpstartSignal first flag NFLX?
Sep 3, 2024 at an entry price of $67.53 (SPOTLIGHT or OPPORTUNITY buy signal). That signal has returned +24% held to the snapshot date, versus +26% for SPY over the same period.
When did JumpstartSignal first flag WDC?
May 10, 2012 at an entry price of $24.45 (MONITOR watchlist tier only). That signal has returned +923% held to the snapshot date, versus +545% for SPY.
Does this mean one stock is a buy and the other isn't?
No. Historical signal frequency and past returns are not buy recommendations. Our pipeline identifies entries that would have matched the template historically. Past performance does not guarantee future results. Use these pages as methodology research, not investment advice.
Where does the underlying data come from?
All entries on this page come from the R30 walk-forward validated backtest covering 2012–2025 (the 'seo_active' snapshot in our golden archive). Entry prices, returns, and SPY comparisons are computed from Stooq end-of-day OHLCV and frozen at snapshot time. See our methodology for details.