Why We Flagged CMCSA but Only Watched NFLX
How did CMCSA (CMCSA) and Netflix (NFLX) fare under JumpstartSignal's 5-stage screening pipeline across our full 2012–2025 walk-forward backtest? We flagged CMCSA 1 time (3 signal days, first signal in 2015) and NFLX 15 times (188 signal days, first signal in 2014). Every entry price, return, and SPY comparison below is from the frozen backtest snapshot.
📌 Note: NFLX only ever reached our MONITOR watchlist tier, it was never promoted to a SPOTLIGHT or OPPORTUNITY buy signal. CMCSA did reach SPOTLIGHT or OPPORTUNITY. That asymmetry is the story of this comparison.
Head-to-Head Stats
CMCSA ✅ OPPORTUNITY CMCSA ·
NFLX 📌 MONITOR Netflix · Communication Services
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.
CMCSA Signal Clusters
| Entry Date | Entry Price | Return | SPY Return | Alpha vs SPY |
|---|---|---|---|---|
| Jun 16, 2015 | $21.60 | +38% | +291% | -254% |
NFLX Signal Clusters
| Entry Date | Entry Price | Return | SPY Return | Alpha vs SPY |
|---|---|---|---|---|
| Feb 5, 2014 | $5.78 | +1344% | +381% | +964% |
| Jul 27, 2017 | $18.27 | +357% | +218% | +139% |
| Jun 25, 2020 | $44.34 | +88% | +147% | -59% |
| Aug 26, 2020 | $54.75 | +52% | +113% | -61% |
| Oct 13, 2020 | $53.08 | +57% | +112% | -55% |
| Oct 19, 2021 | $63.90 | +31% | +62% | -31% |
| May 26, 2023 | $37.89 | +120% | +69% | +51% |
| Nov 8, 2023 | $43.52 | +92% | +63% | +29% |
| Dec 13, 2023 | $47.21 | +77% | +50% | +27% |
| Jan 11, 2024 | $49.22 | +70% | +48% | +22% |
| May 7, 2024 | $60.60 | +38% | +36% | +2% |
| Aug 15, 2024 | $66.32 | +26% | +26% | 0% |
| Nov 25, 2024 | $86.56 | -4% | +16% | -20% |
| Jan 22, 2025 | $95.40 | -12% | +14% | -27% |
| Mar 5, 2025 | $95.00 | -12% | +22% | -34% |
What This Teaches
Which stock a quant system picks more often says more about price-action shape than about the business. NFLX kept printing clean golden-cross + breakout-volume setups (15 distinct clusters over 14 years); CMCSA 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 NFLX?
No. NFLX 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. CMCSA, by contrast, did reach SPOTLIGHT or OPPORTUNITY in our pipeline; that asymmetry is the core story of this page.
Is CMCSA or NFLX a better momentum stock?
In our 14-year backtest, CMCSA had an average alpha of -254% per signal versus +63% for NFLX. CMCSA produced 1 SPOTLIGHT or OPPORTUNITY buy-signal cluster vs 15 MONITOR watchlist clusters for NFLX. 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 CMCSA?
Jun 16, 2015 at an entry price of $21.60 (SPOTLIGHT or OPPORTUNITY buy signal). That signal has returned +38% held to the snapshot date, versus +291% for SPY over the same period.
When did JumpstartSignal first flag NFLX?
Feb 5, 2014 at an entry price of $5.78 (MONITOR watchlist tier only). That signal has returned +1344% held to the snapshot date, versus +381% 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 R27 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.