COST
Moving with the market
- COST +0.62% on the last session vs SPY +0.74%: −0.1 pts of stock-specific move.
- Aftermath, insider unplanned sale (Oct 1): After its 12 unplanned insider sales in the past 5 years, COST typically gained 0.1% over the next day (median) and was higher 50% of the time; half the outcomes fell between -0.6% and +0.6%. An ordinary day: +0.1%. Among S&P 500 stocks after unplanned insider sales, that ranks #18 of 34.
- 12 analyst actions in the past 10 days (1 positive, 8 negative); latest: Deutsche Bank maintained Buy, lowered target $1,091 → $1,079.
- 2 insider or congressional trades in the past 30 days, including 2 insider sales not under a 10b5-1 plan.
- 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%#124 H | +0.5%#83 H | +1.6%#101 H | +4.0%#149 M |
| Big drop Sep 30 (-1.4% or worse) | 67 | -0.2%#488 H | +0.1%#429 H | +1.1%#370 H | +4.5%#224 M |
| Big gain (+1.6% or better) | 52 | +0.4%#40 H | +0.3%#306 H | +1.0%#284 H | +4.4%#208 M |
| Earnings beat | 16 | +0.2%#84 M | 0.0%#467 M | +0.6%#336 M | +4.2%#163 M |
| Earnings miss | 3 | 0.0%#148 L | -4.5%#235 L | +0.3%#162 L | +5.4%#12 L |
| 52-week high | 13 | +0.2%#174 M | +0.2%#217 M | +2.1%#106 M | +8.2%#24 M |
| 52-week low | 1 | +0.9%– | +4.1%– | -1.6%– | +11.5%– |
| Crossed above 200-day avg | 12 | 0.0%#282 M | +1.0%#131 M | -0.8%#457 M | +0.1%#430 M |
| Crossed below 200-day avg | 13 | -0.2%#421 M | -0.5%#373 M | +0.6%#275 M | -0.2%#440 M |
| RSI oversold | 7 | +0.4%#76 L | +0.5%#269 L | +5.1%#19 L | +9.0%#75 L |
| RSI overbought | 19 | -0.4%#438 M | +0.7%#147 M | +3.9%#57 M | +5.1%#21 M |
| Reddit spike | 20 | +0.1%#67 H | -0.3%#83 H | +1.1%#48 M | +6.2%#25 M |
| Analyst upgrade | 3 | -0.6%#19 L | +0.3%#10 L | +10.7%– | +15.2%– |
| Analyst downgrade | 1 | +0.3%– | -0.7%– | +12.0%– | +13.4%– |
| Insider buy | — | — | — | — | — |
| Insider unplanned sale Oct 1 | 12 | +0.1%#18 M | -0.3%#25 M | +0.1%#28 L | +2.8%#21 L |
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 COST's own: its worst / best 10% of days over the prior 2 years. Highlighted: happening in the latest session.
Big drop (-1.4% or worse)
A daily fall among the stock's own worst 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 | 67 | -0.16% (-0.4 to 0.0) | High | #488 of 500 | 42% | -0.19% |
-6%
+4%
|
|
| 1 week | 66 | +0.13% (-0.2 to +0.7) | High | #429 of 500 | 53% | -0.01% |
-13%
+8%
|
|
| 1 month | 65 ≈40 indep. | +1.13% (+0.2 to +2.4) | High | #370 of 500 | 60% | -1.25% |
-14%
+18%
|
|
| 1 quarter | 62 ≈15 indep. | +4.49% (-1.3 to +7.7) | Medium | #224 of 499 | 58% | -0.63% |
-13%
+28%
|
Range of outcomes: all of COST's big drops 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 drop by trend
| When it happened | Events | 1 day | 1 week | 1 month | 1 quarter |
|---|---|---|---|---|---|
| Long trendAbove its 200-day avg | 42 | -0.4%H vs +0.1% | +0.1%H vs +0.5% | +0.6%H vs +1.1% | +0.5%M vs +4.8% |
| Below its 200-day avg now | 25 | +0.2%H vs 0.0% | +0.1%H vs +0.3% | +1.5%M vs +1.2% | +7.2%L vs +4.2% |
| Medium trendAbove its 50-day avg | 31 | -0.4%H vs +0.1% | +0.1%H vs +0.3% | +0.4%H vs -0.1% | +1.7%M vs +3.6% |
| Below its 50-day avg now | 36 | -0.1%H vs 0.0% | +0.1%H vs +0.5% | +1.4%H vs +3.2% | +6.0%M vs +5.1% |
| Short trendAbove its 20-day avg now | 21 | 0.0%H vs +0.1% | +1.4%H vs +0.6% | +0.3%M vs +1.4% | +5.4%M vs +3.3% |
| Below its 20-day avg | 46 | -0.3%H vs 0.0% | -0.1%H vs +0.3% | +1.3%H vs +1.5% | +3.6%M vs +5.1% |
The same event split by where COST 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 drops
| Event | Entry | 1 day | 1 week | 1 month | 1 quarter | |
|---|---|---|---|---|---|---|
| Sep 30, 2026 | Sep 30 @ $910.34 | -1.5% on the day (line -1.4%) | +0.5% | … | … | … |
| Sep 15, 2026 | Sep 15 @ $901.35 | -1.9% on the day (line -1.4%) | -0.8% | -0.2% | … | … |
| Aug 20, 2026 | Aug 20 @ $933.51 | -2.5% on the day (line -1.4%) | +1.5% | +0.1% | -3.8% | … |
| Jul 30, 2026 | Jul 30 @ $954.17 | -2.0% on the day (line -1.4%) | -0.2% | -0.5% | -0.9% | … |
| Jul 9, 2026 | Jul 9 @ $911.52 | -4.2% on the day (line -1.5%) | +0.4% | +3.6% | +4.0% | … |
| Jun 17, 2026 | Jun 17 @ $964.06 | -2.1% on the day (line -1.4%) | -1.5% | -2.4% | -3.1% | -7.3% |
| May 29, 2026 | May 29 @ $954.80 | -3.9% on the day (line -1.3%) | -1.1% | +1.6% | -2.2% | -1.0% |
| May 20, 2026 | May 20 @ $1,072.31 | -1.9% on the day (line -1.2%) | -2.2% | -7.3% | -11.4% | -12.9% |
| May 6, 2026 | May 6 @ $994.17 | -2.0% on the day (line -1.2%) | +1.6% | +3.7% | -2.4% | -4.5% |
| Apr 27, 2026 | Apr 27 @ $994.98 | -1.3% on the day (line -1.2%) | -0.4% | +1.6% | +0.7% | -2.9% |
| Apr 10, 2026 | Apr 10 @ $995.44 | -3.2% on the day (line -1.2%) | -1.8% | +0.1% | +0.2% | -7.1% |
| Mar 18, 2026 | Mar 18 @ $976.95 | -1.6% on the day (line -1.2%) | -0.5% | -0.5% | +2.0% | -1.3% |
| Mar 5, 2026 | Mar 5 @ $979.59 | -2.4% on the day (line -1.2%) | +1.6% | +2.1% | +3.7% | -0.9% |
| Feb 10, 2026 | Feb 10 @ $968.28 | -2.6% on the day (line -1.2%) | +0.7% | +2.6% | +3.3% | +5.4% |
| Dec 15, 2025 | Dec 15 @ $856.78 | -2.7% on the day (line -1.2%) | 0.0% | -1.2% | +11.2% | +14.0% |
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.