| Earnings reported after close | Next-day move |
| June 24, 2026 | +15.74% |
| March 18, 2026 | -3.78% |
| December 17, 2025 | +10.21% |
| September 23, 2025 | -2.83% |
I think I'm right (with exception to two of the last four). The majority have been down the day after and all but one have been down 5 business days after.
From ChatGPT:
MU Earnings Reaction — Regular Trading Hours Only
Earnings Date | Earnings-Day Close | Next Trading-Day Close | Next-Day Change | 5th Trading-Day Close | 1-Week Change
Jun 24, 2026 | $1,048.51 | $1,213.56 | +15.74% | $1,032.28 | -1.55%
Mar 18, 2026 | $461.73 | $444.27 | -3.78% | $382.09 | -17.25%
Dec 17, 2025 | $225.52 | $248.55 | +10.21% | $286.68 | +27.12%
Sep 23, 2025 | $166.41 | $161.71 | -2.82% | $167.32 | +0.55%
Jun 25, 2025 | $126.93 | $125.68 | -0.98% | $121.43 | -4.33%
Mar 20, 2025 | $102.60 | $94.36 | -8.03% | $90.81 | -11.49%
Dec 18, 2024 | $103.37 | $86.64 | -16.18% | $89.36 | -13.55%
Summary:
- Next-day positive: 2 of 7
- Next-day negative: 5 of 7
- Average next-day move: -0.84%
- Median next-day move: -2.82%
Five trading days later:
- Positive: 2 of 7
- Negative: 5 of 7
- Average 1-week move: -2.93%
- Median 1-week move: -4.33%
Change from next-day close to 1-week close:
Jun 2026: -14.94%
Mar 2026: -14.00%
Dec 2025: +15.34%
Sep 2025: +3.47%
Jun 2025: -3.38%
Mar 2025: -3.76%
Dec 2024: +3.14%