CMCSA vs WDC: 6 Signal Clusters, Full Record
How did CMCSA (CMCSA) and Western Digital (WDC) 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 WDC 5 times (6 signal days, first signal in 2013). Every entry price, return, and SPY comparison below is from the frozen backtest snapshot.
Head-to-Head Stats
CMCSA ✅ OPPORTUNITY CMCSA ·
WDC 🏆 SPOTLIGHT 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.
CMCSA Signal Clusters
| Entry Date | Entry Price | Return | SPY Return | Alpha vs SPY |
|---|---|---|---|---|
| Jun 16, 2015 | $21.60 | +38% | +291% | -254% |
WDC Signal Clusters
| Entry Date | Entry Price | Return | SPY Return | Alpha vs SPY |
|---|---|---|---|---|
| Oct 16, 2013 | $43.16 | +480% | +392% | +88% |
| Nov 14, 2013 | $47.23 | +430% | +372% | +57% |
| Dec 4, 2013 | $48.30 | +418% | +371% | +47% |
| Mar 21, 2014 | $55.38 | +352% | +350% | +1% |
| Jun 18, 2014 | $58.31 | +329% | +327% | +2% |
What This Teaches
Signal frequency is not opinion; it's the pipeline firing or not firing against the same rules. Over the 2012–2025 window, WDC triggered entries 5× versus 1× for CMCSA. The lesson here isn't that one company is better than the other; it's that the template is tuned for a specific kind of setup and this pair shows which stock's price behaviour kept offering that setup.
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FAQ
Is CMCSA or WDC a better momentum stock?
In our 14-year backtest, CMCSA had an average alpha of -254% per signal versus +39% for WDC. CMCSA produced 1 SPOTLIGHT or OPPORTUNITY buy-signal cluster vs 5 SPOTLIGHT or OPPORTUNITY buy-signal clusters for WDC.
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 WDC?
Oct 16, 2013 at an entry price of $43.16 (SPOTLIGHT or OPPORTUNITY buy signal). That signal has returned +480% held to the snapshot date, versus +392% 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.