STX
After each kind of event
| Event | Events | Reaction day | 1 day | 1 week | 1 month | 1 quarter |
|---|---|---|---|---|---|---|
| Any day | 1,255 | — | +0.2%659/1254 up | +1.0%715/1250 up | +3.4%739/1234 up | +7.7%772/1192 up |
| Big drop latest session (-4.1% or worse) | 63 | — | -0.5%27/62 up | +0.1%32/62 up | +3.4%37/59 up | +23.0%48/56 up |
| Big gain (+4.9% or better) | 74 | — | +0.6%41/74 up | +1.6%48/74 up | +6.4%53/74 up | +23.9%56/71 up |
| Earnings beat Oct 28 | 16 | +5.7%13/16 up | +0.6%12/16 up | +3.8%8/15 up | +3.7%8/15 up | +9.1%10/15 up |
| Earnings miss | 4 | -8.0%1/4 up | -0.8%1/4 up | +1.8%2/4 up | +3.7%3/4 up | +2.1%2/4 up |
| 52-week high | 19 | — | 0.0%10/19 up | +1.9%11/19 up | +5.2%13/19 up | +8.6%15/19 up |
| 52-week low | 2 | — | -4.4%0/2 up | -0.1%1/2 up | +18.9%2/2 up | +76.9%2/2 up |
| Crossed above 200-day avg | 8 | — | -0.2%3/8 up | +4.0%6/8 up | +3.7%5/7 up | -4.4%3/7 up |
| Crossed below 200-day avg latest session | 7 | — | +0.5%4/7 up | -0.5%2/7 up | +0.8%3/6 up | +1.8%3/6 up |
| RSI oversold | 10 | — | -0.2%4/10 up | -0.7%4/10 up | +1.5%5/9 up | +1.3%5/9 up |
| RSI overbought | 20 | — | -0.1%9/20 up | +1.8%12/20 up | +4.4%14/20 up | +3.5%11/20 up |
| Volume spike | 17 | — | +0.2%9/17 up | -1.2%6/17 up | +1.1%8/16 up | +7.4%11/16 up |
| Theme selloff latest session hindsight | 64 | — | -0.3%30/63 up | +0.5%33/63 up | +2.7%35/60 up | +23.2%44/57 up |
| Theme rally Oct 28 hindsight | 70 | — | +0.7%44/70 up | +3.9%48/69 up | +6.2%46/69 up | +18.0%49/66 up |
| Mention spike (Trendy) Oct 28 | 4 | — | +2.8%4/4 up | +9.6%2/3 up | +10.8%2/3 up | +32.5%2/3 up |
| Analyst upgrade | 3 | — | +2.1%2/3 up | +14.0%2/3 up | +25.5%2/3 up | +45.0%2/3 up |
| Analyst downgrade | — | — | — | — | — | — |
| Insider buy | — | — | — | — | — | — |
| Insider unplanned sale Oct 27 | 21 | — | +3.0%12/21 up | -0.6%9/20 up | +3.0%12/20 up | +58.8%10/13 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 STX'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.
Theme selloff
The stock's theme peers (equal weight, without the stock) fell behind the S&P 500 by one of their worst 10% gaps of the prior 2 years, and by at least 2 pts.
Hindsight: the history below is judged with today's theme lists, which were set on Oct 7, 2026 and hold the stocks that belong to each story now, including ones that didn't back then. So there is no S&P 500 comparison. The clean record starts on Oct 7, 2026: 3 theme selloffs since then; its record shows once there are 3.
| Holding | Events | Median | Up | vs SPY | Range of outcomes (worst · 25–75% · median · best) | vs S&P 500 stocks (their medians) |
|---|---|---|---|---|---|---|
| 1 day | 63 | -0.26% | 30 of 63 | +0.05% |
-10%
+11%
|
— |
| 1 week | 63 | +0.52% | 33 of 63 | +1.19% |
-19%
+33%
|
— |
| 1 month | 60 ≈35 indep. | +2.72% | 35 of 60 | +1.20% |
-22%
+77%
|
— |
| 1 quarter | 57 ≈15 indep. | +23.15% | 44 of 57 | +17.48% |
-25%
+167%
|
— |
Range of outcomes: all of STX's theme selloffs 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.
Theme selloff by trend
| When it happened | Events | 1 day | 1 week | 1 month | 1 quarter |
|---|---|---|---|---|---|
| Long trendAbove its 200-day avg | 52 | -0.4%52 events vs +0.3% | +1.3%52 events vs +1.3% | +2.7%50 events vs +4.5% | +22.1%47 events vs +12.8% |
| Below its 200-day avg now | 12 | +0.6%11 events vs 0.0% | -0.8%11 events vs +1.4% | +3.9%10 events vs +4.4% | +27.9%10 events vs +13.0% |
| Medium trendAbove its 50-day avg | 36 | -0.7%36 events vs +0.2% | +1.3%36 events vs +0.9% | +3.5%36 events vs +3.7% | +29.5%34 events vs +12.5% |
| Below its 50-day avg now | 28 | +0.6%27 events vs +0.1% | -0.2%27 events vs +1.3% | +1.1%24 events vs +2.4% | +20.2%23 events vs +0.2% |
| Short trendAbove its 20-day avg | 32 | -0.9%32 events vs +0.2% | +1.4%32 events vs +0.7% | +3.8%32 events vs +3.4% | +32.1%30 events vs +8.7% |
| Below its 20-day avg now | 32 | +0.6%31 events vs +0.1% | -0.2%31 events vs +1.4% | +0.6%28 events vs +3.0% | +11.3%27 events vs +6.4% |
The same event split by where STX 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 theme selloffs
| Event | Entry | 1 day | 1 week | 1 month | 1 quarter | |
|---|---|---|---|---|---|---|
| Oct 30, 2026 | Oct 30 @ $644.58 | Memory & storage peers -6.8 pts vs SPY; the stock -8.0% | … | … | … | … |
| Oct 22, 2026 | Oct 22 @ $642.14 | Memory & storage peers -5.1 pts vs SPY; the stock -7.9% | -1.8% | +9.1% | … | … |
| Oct 14, 2026 | Oct 14 @ $713.54 | Memory & storage peers -4.3 pts vs SPY; the stock -4.5% | -3.2% | -2.3% | … | … |
| Oct 6, 2026 | Oct 6 @ $805.63 | Memory & storage peers -3.6 pts vs SPY; the stock -9.2% | +0.2% | -7.3% | … | … |
| Sep 10, 2026 | Sep 10 @ $861.64 | Memory & storage peers -3.2 pts vs SPY; the stock -2.7% | -3.7% | -6.9% | -9.1% | … |
| Aug 18, 2026 | Aug 18 @ $902.96 | Memory & storage peers -5.8 pts vs SPY; the stock -9.2% | -7.9% | -9.1% | -11.1% | … |
| Aug 5, 2026 | Aug 5 @ $836.99 | Memory & storage peers -2.8 pts vs SPY; the stock -0.9% | +1.8% | +4.8% | -4.7% | … |
| Jul 24, 2026 | Jul 24 @ $851.01 | Memory & storage peers -6.4 pts vs SPY; the stock -6.8% | -4.1% | +0.5% | -6.7% | -24.5% |
| Jul 13, 2026 | Jul 13 @ $859.97 | Memory & storage peers -6.0 pts vs SPY; the stock -5.5% | +2.1% | -6.8% | -4.7% | -8.9% |
| Jul 1, 2026 | Jul 1 @ $914.46 | Memory & storage peers -6.5 pts vs SPY; the stock -5.2% | -10.4% | -2.7% | -6.5% | +0.9% |
| Jun 23, 2026 | Jun 23 @ $1,037.02 | Memory & storage peers -7.4 pts vs SPY; the stock -5.1% | -4.3% | -7.0% | -12.0% | -11.4% |
| Jun 4, 2026 | Jun 4 @ $924.59 | Memory & storage peers -4.4 pts vs SPY; the stock -1.6% | -8.5% | -6.3% | -10.6% | -13.7% |
| May 18, 2026 | May 18 @ $739.72 | Memory & storage peers -3.8 pts vs SPY; the stock -6.9% | -1.0% | +14.2% | +43.9% | +22.1% |
| May 7, 2026 | May 7 @ $765.28 | Memory & storage peers -2.4 pts vs SPY; the stock -2.5% | +2.1% | +5.0% | +14.4% | +6.1% |
| Apr 28, 2026 | Apr 28 @ $578.15 | Memory & storage peers -2.7 pts vs SPY; the stock -2.8% | +11.1% | +33.2% | +52.1% | +32.1% |
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.