Micron Technology (NASDAQ: MU) enters September with fiscal 2026 fourth-quarter results due on the 30th, and the month sets up as a contest between improving fundamentals and a seasonal pattern that has worked against the stock more years than not. At Friday's close of $932.86, shares are still well below the 52-week high of $1,255, recovering from a summer chip sell-off that briefly took MU under $740 in late July.
The read-through on September history is complicated. From 2017 through 2025, Micron has averaged a 4.1% September gain. That average is doing almost no descriptive work: the 40% return in September 2025 is the single observation that pulls the mean positive. In the eight Septembers before 2025, the average return was negative, and the stock finished September in the red in five of the nine years in the full window. The S&P 500 has averaged a negative September return from 1928 through 2023, so the backdrop is not unique to MU. October has been kinder, averaging a 5.3% gain over the same 2017-2025 period with positive returns in five of nine years. November averages a 7.8% gain, positive six of nine times.
The case for a structural re-rating rests on a different data set. Micron's cloud memory gross margin came in at 83% in the third quarter of fiscal 2026, up from 58% in the same quarter a year earlier. The company reported signing 16 strategic customer agreements as of the Q3 2026 earnings call, with expected financial commitments and cash deposits totaling $22 billion. The logic: locking in floor prices and reliable revenue before leading memory makers' new foundries bring supply into balance with demand. Statista projects the global AI market will grow from $617.6 billion in 2026 to $1.4 trillion by 2032.
The counterargument is Micron's forward price-to-earnings ratio of 6. The stock is up 227% in 2026 through August. The market is still pricing in a cyclical, not a contracted platform. Supply will catch up; pricing power will fade. The $22 billion in commitments is management's stated answer to that skepticism. September 30 is when investors decide whether to accept it.
On balance, the seasonal calendar is noise around a more important structural question. What the September 30 print actually resolves is whether the margin and contract story is convincing enough to move that forward P/E from 6.