Key Highlights

  • Samsung Electronics rose 9.12%, Kioxia 13.76% and SoftBank 4.65% on October 28, 2026, ahead of earnings that read through to Micron Technology (NASDAQ:MU), Western Digital and Seagate. Results arrive within two days.
  • Samsung reports on Thursday, October 29, 2026 and Kioxia on Friday, October 30, so the rally is a bet on strong memory results, not a reaction to reported numbers.
  • Japan's Nikkei 225 rose 1.08% to 63,954.14, though an early reading of 64,094.51, up 1.3%, differed, and the Hang Seng figure repeated from October 27 is not used.
  • Micron Technology (NASDAQ:MU) rose 2.77% on October 27, 2026, so US memory shares had already moved before the Asian rally, which leaves less room for surprise. Expectations are now higher.

A Memory Rally Before the Results

Samsung Electronics rose 9.12% on October 28, 2026, Kioxia 13.76% and SoftBank 4.65%. Samsung reports on Thursday, October 29, and Kioxia on Friday, October 30. Japan's Nikkei 225 rose 1.08% to 63,954.14, though an early report put it at 64,094.51, up 1.3%, so the close is used. SK Hynix's record profit and the Kospi's 6.63% jump set the tone. Micron Technology (NASDAQ:MU) gained 2.77% on October 27. The moves reflect expectations, not reported results, and no Samsung or Kioxia numbers are available yet. Kioxia's gain was the largest of the three, at 13.76%, which shows how strongly investors expect its memory business to benefit. Samsung's move came before any numbers were published, so the rally rests on hope and on the read-across from SK Hynix.

Why It Reads Through to US Memory

Memory chips are used in nearly every AI server, and prices for them can swing sharply. When Samsung and Kioxia report, they reveal demand, prices and inventory in the market, and those same forces drive earnings at Micron Technology (NASDAQ:MU), Western Digital and Seagate. Strong results from Asian peers can lift US shares, while weak guidance can drag them down. Rallies of 9% to 14% before earnings raise the bar: a good report may already be priced in, and a mere in-line report could trigger a sell-off. Investors compare results with consensus rather than with prior-year numbers alone. Seagate fell after-hours in the October 27 session despite a beat, which shows how harsh reactions can be.

Risks and What to Watch

Memory is cyclical, and pricing can fall quickly when supply catches up with demand. The Federal Reserve decision at 2:00 p.m. ET on October 28, 2026 and a 10-year yield near 4.995% could hit rate-sensitive technology stocks. Microsoft and Alphabet report that evening, and their data-centre plans feed memory demand. Seagate fell in after-hours trading on October 27 despite a beat, which shows reactions can be harsh. Nothing here is advice for Micron Technology (NASDAQ:MU) holders. Another risk is that Asian results can be quoted in different currencies and accounting bases, which makes comparisons harder. A hawkish Fed would likely add pressure to shares already stretched by a sharp rally.

Where Things Stand

Samsung and Kioxia rallied into earnings because SK Hynix's record profit and an AI memory boom raised expectations for Thursday and Friday results. For Micron Technology (NASDAQ:MU), the read-through is positive but crowded: a rally of 9% to 14% before results leaves little room for disappointment. Reported numbers on October 29 and 30, 2026 will decide whether memory shares can hold the gains. Because the rally is before the reports, the real read-through will come only when the figures are out, so this piece should be updated after October 30, 2026.