BSX
Underperforming without a clear catalyst yet
- BSX −1.46% on the last session vs SPY +0.74%: −2.2 pts of stock-specific move.
- Aftermath, 52-week low (Oct 2): After its 5 new 52-week lows in the past 5 years, BSX typically gained 1.1% over the next day (median) and was higher 60% of the time; half the outcomes fell between -0.6% and +1.1%. An ordinary day: +0.1%. Among S&P 500 stocks after new 52-week lows, that ranks #46 of 272. (Low confidence: few independent periods.)
- 1 insider or congressional trade in the past 30 days.
- Market backdrop (Fri): Average Hourly Earnings m/m 0.1% vs 0.3% expected (cooler); Non-Farm Employment Change 29K vs 89K expected (weaker); S&P futures +0.41%, 10-year yield -5bp in the 30 minutes after.
After each kind of event
| Event | Events | 1 day | 1 week | 1 month | 1 quarter |
|---|---|---|---|---|---|
| Any day | 1,255 | +0.1%#266 H | +0.3%#233 H | +1.1%#186 H | +3.5%#175 M |
| Big drop (-2.0% or worse) | 63 | -0.3%#490 H | -0.1%#451 H | +0.1%#361 H | +0.5%#312 M |
| Big gain (+1.6% or better) | 68 | +0.1%#257 H | -1.4%#494 H | -0.4%#402 H | +1.4%#351 M |
| Earnings beat | 17 | 0.0%#252 M | -0.9%#354 M | +1.4%#230 M | +2.2%#290 M |
| Earnings miss | 2 | +0.3%– | +0.2%– | +3.1%– | +10.3%– |
| 52-week high | 21 | 0.0%#450 H | -0.7%#476 H | +1.1%#140 H | +5.6%#67 M |
| 52-week low latest session | 6 | +1.1%#46 L | -2.3%#209 L | -9.6%#260 L | -27.6%– |
| Crossed above 200-day avg | 5 | -0.3%#314 L | +0.6%#207 L | -1.5%#348 L | +8.9%#139 L |
| Crossed below 200-day avg | 5 | -0.7%#367 L | -0.4%#299 L | -1.8%#465 L | +1.7%#272 L |
| RSI oversold | 14 | +0.6%#67 M | +1.4%#157 M | -3.4%#435 M | -5.9%#345 L |
| RSI overbought | 16 | -0.4%#478 M | +0.3%#132 M | +1.1%#80 M | +4.1%#66 M |
| Reddit spike | — | — | — | — | — |
| Analyst upgrade | — | — | — | — | — |
| Analyst downgrade | — | — | — | — | — |
| Insider buy | — | — | — | — | — |
| Insider unplanned sale | — | — | — | — | — |
Median gain from the close of the session the event was known, over each holding period; #rank among the S&P 500 stocks after the same kind of event (#1 = best). "Big" is BSX's own: its worst / best 10% of days over the prior 2 years. Highlighted: happening in the latest session.
Big gain (+1.6% or better)
A daily rise among the stock's own best 10% of the prior 2 years.
| Holding | Events | Median (likely range) | Confidence | Rank | Up | vs SPY | Range of outcomes (worst · 25–75% · median · best) | vs S&P 500 stocks (their medians) |
|---|---|---|---|---|---|---|---|---|
| 1 day | 68 | +0.09% (-0.1 to +0.5) | High | #257 of 500 | 54% | +0.06% |
-5%
+4%
|
|
| 1 week | 68 | -1.38% (-2.3 to -0.9) | High | #494 of 500 | 40% | -0.93% |
-12%
+8%
|
|
| 1 month | 66 ≈41 indep. | -0.39% (-3.1 to +1.4) | High | #402 of 500 | 48% | -1.42% |
-21%
+16%
|
|
| 1 quarter | 61 ≈15 indep. | +1.42% (-1.6 to +5.5) | Medium | #351 of 499 | 57% | -5.51% |
-37%
+27%
|
Range of outcomes: all of BSX's big gains 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.
Big gain by trend
| When it happened | Events | 1 day | 1 week | 1 month | 1 quarter |
|---|---|---|---|---|---|
| Long trendAbove its 200-day avg | 45 | +0.2%H vs +0.1% | -0.3%H vs +0.6% | +1.9%H vs +2.2% | +5.1%M vs +7.6% |
| Below its 200-day avg now | 23 | +0.1%H vs 0.0% | -3.0%H vs -0.2% | -7.4%M vs -3.9% | -26.9%L vs -11.4% |
| Medium trendAbove its 50-day avg | 42 | 0.0%H vs +0.1% | -0.9%H vs +0.3% | +0.6%H vs +1.2% | +3.5%M vs +6.1% |
| Below its 50-day avg now | 26 | +0.5%H vs +0.1% | -1.9%H vs +0.4% | -5.0%M vs +1.3% | -8.8%L vs -1.3% |
| Short trendAbove its 20-day avg | 44 | +0.3%H vs 0.0% | -0.9%H vs +0.3% | +1.2%H vs +1.3% | +3.4%M vs +5.5% |
| Below its 20-day avg now | 24 | 0.0%H vs +0.1% | -1.9%H vs +0.4% | -5.5%M vs +0.9% | -3.9%M vs +1.4% |
The same event split by where BSX 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, so watch the confidence letters: H / M / L.
Latest big gains
| Event | Entry | 1 day | 1 week | 1 month | 1 quarter | |
|---|---|---|---|---|---|---|
| Sep 22, 2026 | Sep 22 @ $44.92 | +2.7% on the day (line +1.6%) | -0.7% | -2.3% | … | … |
| Sep 14, 2026 | Sep 14 @ $45.05 | +4.8% on the day (line +1.6%) | -2.6% | -3.0% | … | … |
| Aug 31, 2026 | Aug 31 @ $48.30 | +3.1% on the day (line +1.6%) | -0.5% | -6.9% | -9.6% | … |
| Aug 19, 2026 | Aug 19 @ $52.01 | +3.0% on the day (line +1.6%) | -5.1% | -7.4% | -16.7% | … |
| Aug 3, 2026 | Aug 3 @ $48.43 | +3.6% on the day (line +1.6%) | +1.4% | +4.2% | -0.7% | … |
| Jul 24, 2026 | Jul 24 @ $44.25 | +1.5% on the day (line +1.5%) | +2.8% | +5.6% | +10.8% | … |
| Jul 16, 2026 | Jul 16 @ $44.62 | +3.7% on the day (line +1.5%) | -1.3% | -2.3% | +16.2% | … |
| Jul 2, 2026 | Jul 2 @ $45.14 | +4.8% on the day (line +1.5%) | -1.2% | -0.8% | +7.3% | -4.2% |
| Jun 23, 2026 | Jun 23 @ $45.60 | +2.9% on the day (line +1.5%) | -2.5% | -6.4% | -4.4% | -1.5% |
| Jun 4, 2026 | Jun 4 @ $48.85 | +2.4% on the day (line +1.5%) | -0.6% | -3.4% | -7.3% | -3.9% |
| May 18, 2026 | May 18 @ $55.92 | +6.2% on the day (line +1.5%) | +1.6% | +3.1% | -19.6% | -9.7% |
| Apr 22, 2026 | Apr 22 @ $64.87 | +9.0% on the day (line +1.5%) | +1.3% | -11.9% | -11.9% | -32.8% |
| Apr 13, 2026 | Apr 13 @ $63.18 | +2.2% on the day (line +1.5%) | +1.0% | -3.5% | -14.4% | -32.5% |
| Mar 25, 2026 | Mar 25 @ $69.78 | +2.4% on the day (line +1.5%) | +0.6% | -11.1% | -11.0% | -36.7% |
| Mar 17, 2026 | Mar 17 @ $71.20 | +2.0% on the day (line +1.5%) | +0.1% | -4.3% | -10.9% | -34.1% |
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. Past performance after an event says nothing certain about the next one. Not advice.