WDC
After each kind of event
| Event | Events | Reaction day | 1 day | 1 week | 1 month | 1 quarter |
|---|---|---|---|---|---|---|
| Any day | 1,255 | — | +0.2%661/1254 up | +1.1%723/1250 up | +4.4%780/1234 up | +9.1%731/1192 up |
| Big drop Oct 22 (-4.5% or worse) | 57 | — | -0.2%28/57 up | -0.6%26/56 up | +4.1%33/54 up | +13.2%36/50 up |
| Big gain Oct 19 (+5.3% or better) | 79 | — | +0.5%48/79 up | +3.0%46/78 up | +5.8%48/77 up | +21.4%55/74 up |
| Earnings beat latest session | 17 | -0.7%8/17 up | +0.4%10/17 up | +3.8%12/17 up | +6.5%12/17 up | +16.5%10/16 up |
| Earnings miss | 3 | -1.4%1/3 up | +2.9%2/3 up | -1.8%0/3 up | -5.5%1/3 up | -11.6%1/3 up |
| 52-week high | 20 | — | +0.5%12/20 up | -0.1%9/20 up | +7.0%14/20 up | +20.6%16/20 up |
| 52-week low | 2 | — | -0.3%1/2 up | -1.4%1/2 up | -4.4%1/2 up | +22.1%2/2 up |
| Crossed above 200-day avg | 8 | — | +0.2%5/8 up | +0.9%5/8 up | +1.0%6/8 up | -1.1%3/8 up |
| Crossed below 200-day avg | 10 | — | -0.4%4/10 up | -1.5%4/10 up | +3.7%6/9 up | +0.3%5/9 up |
| RSI oversold | 9 | — | 0.0%4/9 up | +1.4%5/9 up | +1.8%4/8 up | +12.2%5/8 up |
| RSI overbought | 22 | — | +0.2%12/22 up | +3.2%15/22 up | +7.4%15/22 up | +19.6%16/22 up |
| Volume spike | 14 | — | +0.3%9/14 up | -1.4%6/14 up | +7.0%10/13 up | +17.6%11/13 up |
| Theme selloff Oct 22 hindsight | 57 | — | -0.7%25/57 up | -0.6%28/56 up | +6.4%34/54 up | +14.1%37/51 up |
| Theme rally hindsight | 71 | — | +0.8%48/71 up | +3.5%46/71 up | +7.0%45/71 up | +24.1%50/67 up |
| Mention spike (Trendy) latest session | 8 | — | +0.3%4/7 up | -0.9%2/7 up | -0.6%3/6 up | +29.2%4/5 up |
| Analyst upgrade | — | — | — | — | — | — |
| Analyst downgrade | — | — | — | — | — | — |
| Insider buy | — | — | — | — | — | — |
| Insider unplanned sale | 10 | — | +2.2%8/10 up | +3.0%8/10 up | +8.7%9/10 up | +54.1%7/9 up |
Median gain from the close of the session the event was known, over each holding period; Reaction day (earnings only): the session that first traded on the report, from the close before it; under it, how many of the past events were followed by a gain (12/20 up). "Big" is WDC's own: its worst / best 10% of days over the prior 2 years. Highlighted: happening in the latest session or today, from the live quote.
Volume spike
Volume at least 3x the prior 20 sessions' average.
| Holding | Events | Median | Up | vs SPY | Range of outcomes (worst · 25–75% · median · best) | vs S&P 500 stocks (their medians) |
|---|---|---|---|---|---|---|
| 1 day | 14 | +0.27% | 9 of 14 | +0.10% |
-11%
+6%
|
|
| 1 week | 14 | -1.40% | 6 of 14 | -1.04% |
-7%
+10%
|
|
| 1 month | 13 | +7.05% | 10 of 13 | +4.24% |
-6%
+36%
|
|
| 1 quarter | 13 ≈10 indep. | +17.63% | 11 of 13 | +13.95% |
-20%
+91%
|
Range of outcomes: all of WDC's volume spikes in the past 5 years, from the worst to the best result over each holding period; the box holds the middle half, the tick is the median. A wide box means the median alone says little. Hover the median for the average.
Volume spike by trend
| When it happened | Events | 1 day | 1 week | 1 month | 1 quarter |
|---|---|---|---|---|---|
| Long trendAbove its 200-day avg | 8 | +0.3%8 events vs +0.2% | -2.0%8 events vs +1.4% | +5.3%7 events vs +7.0% | +33.1%7 events vs +20.2% |
| Below its 200-day avg now | 4 | -2.9%4 events vs 0.0% | +3.3%4 events vs +0.6% | +16.7%4 events vs +3.1% | +33.9%4 events vs +7.0% |
| Medium trendAbove its 50-day avg | 9 | +0.2%9 events vs +0.2% | -2.0%9 events vs +1.3% | +5.3%9 events vs +6.6% | +17.6%9 events vs +15.5% |
| Below its 50-day avg now | 5 | +1.9%5 events vs 0.0% | +2.1%5 events vs +0.5% | +15.9%4 events vs +1.8% | +33.4%4 events vs +5.2% |
| Short trendAbove its 20-day avg | 9 | +0.2%9 events vs +0.2% | -2.0%9 events vs +1.0% | +5.3%9 events vs +5.3% | +17.6%9 events vs +11.3% |
| Below its 20-day avg now | 5 | +1.9%5 events vs 0.0% | +2.1%5 events vs +1.1% | +15.9%4 events vs +3.5% | +33.4%4 events vs +8.2% |
The same event split by where WDC stood against its 200-, 50- and 20-day averages when it happened (a dip in an uptrend vs a falling knife); "vs" is the plain any-day median in that trend; "now" marks where it stands today. Splitting halves the evidence: each cell shows how many past events it rests on.
Latest volume spikes
| Event | Entry | 1 day | 1 week | 1 month | 1 quarter | |
|---|---|---|---|---|---|---|
| Oct 2, 2026 | Oct 2 @ $415.29 | 3.6x average volume, -10.2% on the day | +6.3% | -4.3% | … | … |
| Dec 19, 2025 | Dec 19 @ $180.89 | 5.1x average volume, +3.5% on the day | -2.4% | -0.8% | +34.4% | +66.3% |
| Sep 5, 2025 | Sep 5 @ $91.87 | 3.1x average volume, +1.7% on the day | +1.4% | +6.1% | +36.1% | +75.1% |
| Jul 31, 2025 | Jul 31 @ $78.45 | 3.7x average volume, +10.2% on the day | -2.7% | -5.4% | +2.1% | +79.9% |
| Apr 3, 2025 | Apr 3 @ $33.98 | 3.0x average volume, -18.3% on the day | -10.6% | +2.1% | +31.9% | +91.3% |
| Oct 25, 2024 | Oct 25 @ $52.24 | 3.9x average volume, +4.7% on the day | +0.4% | -5.1% | 0.0% | -9.6% |
| Aug 1, 2024 | Aug 1 @ $45.53 | 4.5x average volume, -9.7% on the day | -5.5% | -2.6% | +8.4% | +10.7% |
| Mar 1, 2024 | Mar 1 @ $48.36 | 3.1x average volume, +8.1% on the day | 0.0% | -2.0% | +7.0% | +17.1% |
| Jan 22, 2024 | Jan 22 @ $42.87 | 3.6x average volume, +4.1% on the day | +1.3% | +4.8% | -6.3% | +17.6% |
| Nov 30, 2023 | Nov 30 @ $36.34 | 3.3x average volume, +2.1% on the day | +0.2% | -2.1% | +5.3% | +33.1% |
| Oct 26, 2023 | Oct 26 @ $28.78 | 5.5x average volume, -9.3% on the day | +1.9% | +10.2% | +23.4% | +56.2% |
| May 15, 2023 | May 15 @ $27.64 | 3.1x average volume, +11.3% on the day | -0.4% | +4.4% | +10.1% | +11.7% |
| May 3, 2022 | May 3 @ $46.42 | 5.1x average volume, +14.5% on the day | +1.8% | -7.1% | +0.3% | -20.0% |
| Jan 28, 2022 | Jan 28 @ $37.53 | 4.8x average volume, -7.3% on the day | +3.7% | +3.8% | -0.8% | +6.4% |
Aftermath: entry is the close of the first session the event was fully known (the same session for price moves, the reaction session for earnings, the next session for Reddit, analyst and insider events, which are dated by day). Repeats within a few sessions count as one event. This is history, not a forecast: in our backtests, how a stock did after its past events did not predict its next one. Not advice.