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Market themes↑ heating up

The memory chip shortage

AI data centers are bidding up memory chip prices: record profits for memory makers, higher costs for device makers.

Market value moved since Sep 2025
+$2.8Twinners

Combined change in market value of the companies the theme hits directly. Ripple effects aren't counted, and not every dollar of each move is down to this theme.

What's happening

AI chips sit next to stacks of high-bandwidth memory, or HBM, which feeds them data fast enough to run large models. HBM is cut from the same silicon wafers as ordinary DRAM, the working memory in phones and PCs, but Micron says it takes about three times the wafer space per bit. About 20% of the industry's DRAM wafers now go to HBM, and Samsung expects nearly 30% next year. Only Samsung, SK hynix and Micron make DRAM at scale, and new factories take years: SK hynix's next big plant opens its first cleanroom in early 2027, and Micron's new Idaho plant was not expected to start before 2027. So ordinary memory ran short. TrendForce estimated contract prices for conventional DRAM rose 90% to 95% in the first quarter of 2026 alone. Flash, the chips that store files and keep them when the power is off, followed: Kioxia's selling prices rose about 70% in a single quarter.

Who wins, who pays, and why

Memory makers sell into a market with more buyers than chips, so most of each price increase becomes profit. Micron's revenue rose to $54.2 billion last quarter from $11.3 billion a year earlier, with a gross margin of 86.8%. SK hynix earned a 76% operating margin in the June quarter, and Samsung expects a record operating profit of 107.4 trillion won ($80 billion) for the September quarter, almost nine times a year earlier. Flash makers Sandisk and Kioxia gained the same way. Device makers pay those prices and can pass on only part of them. Apple raised Mac and iPad prices by at least $100 in June. Nintendo raised the Switch 2's price. Xiaomi's adjusted profit fell 43% in the June quarter.

Where it stands On Sept. 30 Micron forecast another record quarter and said it will spend more on factories, citing customer demand visible through the end of the decade.

Who wins, who loses

Tends to rise
  • Micron TechnologyMU
    +$829B market value since Sep 2025

    The only one of the three big DRAM makers based outside Korea; makes DRAM and flash. Revenue rose 379% to $54.2 billion last quarter.

    Read the breakdown →
  • SK hynix000660.KSnot in the 100
    +$757B market value since Sep 2025

    Mostly DRAM, and the largest maker of HBM for AI chips. June-quarter operating profit rose 557% to 60.5 trillion won, a 76% margin.

  • Samsung Electronics005930.KSnot in the 100
    +$930B market value since Sep 2025

    The biggest memory maker overall, but memory is one division beside phones and TVs. Expects record quarterly operating profit of 107.4 trillion won.

  • Sandisk CorporationSNDK
    +$152B market value since Sep 2025

    Flash only, spun off from Western Digital in 2025, so it gains from storage prices, not HBM. Revenue rose 372% to $8.97 billion last quarter.

    Read the breakdown →
  • Kioxia285A.Tnot in the 100
    +$172B market value since Sep 2025

    Flash only, formerly Toshiba's memory business; makes the same chips as Sandisk in factories they run jointly. Selling prices rose about 70% in one quarter.

  • Western DigitalWDCripple effect

    Sells hard drives to the same AI data centers; revenue rose 55% to $4.38 billion last quarter as storage demand climbed.

    Read the breakdown →
  • Seagate TechnologySTXripple effect

    Hard drive maker riding AI data center storage demand; revenue rose 61% to $4.23 billion last quarter, with a 57% gross margin.

    Read the breakdown →
Tends to fall
  • AppleAAPLripple effect

    Raised Mac and iPad prices by at least $100 in June; fell 7.2% in a week after warning of higher memory costs in July.

    Read the breakdown →
  • QualcommQCOMripple effect

    Fell 11.6% the week of its July 29 forecast; said pricier memory is pushing phone buyers toward cheaper models.

    Read the breakdown →
  • Xiaomi1810.HKripple effectnot in the 100

    Adjusted profit fell 43% in the June quarter as memory costs squeezed phone margins; shares are down 54% since September 2025.

  • Nintendo7974.Tripple effectnot in the 100

    Raised the Switch 2's U.S. price to $499.99 and expects about 100 billion yen of higher costs, mostly memory, plus tariffs.

Less-watched ways to play it

Companies with real exposure to this theme that haven't moved like the leaders. Each one is paper-traded with $10,000 from the first close after we publish it and tracked against the leaders and the S&P 500, here and on the track record. Picks are never edited or removed from the log. This is research, not a recommendation to buy.

RambusRMBSnot in the 100
Paper trade from $101.04 on Oct 12: -16.9% · leaders -21.7% · S&P 500 -3.3%
Exposure
Memory interface chips, sold mainly to Micron, Samsung and SK hynix for server and PC memory modules, made 48% of revenue in the June 2026 quarter.
Why it's less watched
$11.7 billion market value, about 1% of Micron's; eight analysts cover it, against 49 for Micron.
Not yet priced in
Up 46% since Sept. 2, 2025, against 284% to 2,997% for the leaders. It fell 23% in April when tight DRAM supply capped module sales. Forward P/E 32, versus 5.8 for Micron.
The catch
It is paid per memory module, not per price increase, so a shortage can cut its volumes. It is also answering a Justice Department antitrust grand jury subpoena.
CamtekCAMTnot in the 100
Paper trade from $147.63 on Oct 12: -26.7% · leaders -21.7% · S&P 500 -3.3%
Exposure
Two HBM makers gave Camtek orders and forecasts worth over $260 million for 2026 and 2027, close to its $255 million first-half 2026 revenue. About half of revenue is AI-related.
Why it's less watched
$7.1 billion market value, under 1% of Micron's; 12 analysts cover it, against 49 for Micron.
Not yet priced in
Up 95% since Sept. 2, 2025, against 284% to 2,997% for the leaders. June-quarter sales grew only 8% because new orders ship late 2026 and 2027. Forward P/E 34, versus 5.8 for Micron.
The catch
Its price already assumes a big second-half jump in sales. A few HBM and packaging customers drive the orders, and the company is based in Israel.
Axcelis TechnologiesACLSnot in the 100
Paper trade from $127.63 on Oct 12: -25.4% · leaders -21.7% · S&P 500 -3.3%
Exposure
Ion implant tools for DRAM makers were 22% of Axcelis's systems revenue in the first half of 2026; power and other mature chips took 77%.
Why it's less watched
$4.2 billion market value; five analysts cover it, against 49 for Micron.
Not yet priced in
Up 69% since Sept. 2, 2025, against 284% to 2,997% for the leaders, because most sales go to slower power chips; first-half revenue grew 7%. Forward P/E 28, versus 5.8 for Micron.
The catch
Memory is the smaller part of its business, and its all-stock merger with Veeco, agreed in September 2025, still awaits Chinese antitrust approval.
Penguin SolutionsPENGnot in the 100
Paper trade from $79.16 on Oct 12: -40.0% · leaders -21.7% · S&P 500 -3.3%
Exposure
Memory modules made 60% of sales in the quarter ended Aug. 28, 2026: $341 million, up 158% from a year earlier on higher volumes and prices.
Why it's less watched
$3.9 billion market value, the smallest of these picks; eight analysts cover it.
Not yet priced in
Up 220% since Sept. 2, 2025, the most of these picks but below every leader (Samsung 284%, Micron 770%). Forward P/E 17, versus 5.8 for Micron and 7.4 for Sandisk.
The catch
It buys memory chips and builds them into modules, so it earns a markup, not the shortage windfall. Gross margin was 27.5% last quarter, against Micron's 86.8%.

When it moved markets

  1. Week of Sep 28Micron reported record results Sept. 30 and forecast more, but slipped 0.7% for the week as it raised factory spending plans.
  2. Week of Aug 10Micron rose 10.7% as AI results reassured investors and NewStreet Research upgraded the stock to buy.
  3. Week of Jul 27Apple fell 7.2% and Qualcomm 11.6% after both blamed the memory shortage for weak forecasts.
  4. Week of Jun 29Micron fell 13.8% as investors took profits, though it remained up more than 260% for the year.

Sources

  1. 1Dow closes little changed after touching record; Nasdaq slides to start July · CNBC, 2026-07-01
  2. 2Dow jumps nearly 600 points to record close; Nasdaq slides as chip stocks suffer: Live updates · CNBC, 2026-07-02
  3. 3Alphabet, Amazon and Microsoft added nearly $1.5 trillion in combined value this week · CNBC, 2026-07-31
  4. 4Qualcomm to raise prices during memory crunch as chipmaker issues light earnings guidance · CNBC, 2026-07-29
  5. 5S&P 500 closes higher after tame consumer inflation report, tech sector rises · CNBC, 2026-08-12
  6. 6S&P 500 closes lower, but posts third straight weekly gain: Live updates · CNBC, 2026-08-14
  7. 7MU Stock Drops After Hours: Micron's Heightened Capex Forecast Overpowers Q4 Beat, Expectation-Beating Q1 Guidance · Yahoo Finance, 2026-09-30
  8. 8Micron Technology fiscal fourth quarter 2026 results (Exhibit 99.1) · Micron via SEC EDGAR, 2026-09-30
  9. 9[Insights] Memory Spot Price Update: SanDisk's 10% Price Hike Meets Demand-Side Resistance · TrendForce, 2025-09-10
  10. 10[News] Micron Reveals Three Culprits Behind Memory Crunch, and Why It Won't Ease Soon · TrendForce, 2025-12-18
  11. 11Memory Price Outlook for 1Q26 Sharply Upgraded; QoQ Increases of All Product Categories to Hit Record Highs, Says TrendForce · TrendForce, 2026-02-02
  12. 12[News] Samsung Sees HBM Taking Nearly 30% of Industry DRAM Capacity in 2027, Up From 20% Currently · TrendForce, 2026-09-29
  13. 13AI Server Demand Sustains Memory Contract Price Increases in 4Q26, While Consumer-Side Pressure Persists, Says TrendForce · TrendForce, 2026-09-30
  14. 14SK hynix Announces 2Q26 Financial Results · SK hynix, 2026-07-29
  15. 15Samsung forecasts record third-quarter profit of $80 billion as AI boom fuels chip demand · CNBC, 2026-10-08
  16. 16Sandisk Reports Fiscal Fourth Quarter 2026 Financial Results (Exhibit 99.1) · Sandisk via SEC EDGAR, 2026-08-05
  17. 17[News] Kioxia 1QFY26 Gross Margin Hits 80%; Reaffirms 50% LTA Target for 2028 · TrendForce, 2026-07-31
  18. 18WD Reports Fiscal Fourth Quarter and Fiscal Year 2026 Financial Results (Exhibit 99.1) · Western Digital via SEC EDGAR, 2026-08-05
  19. 19Seagate Technology Reports Fiscal Fourth Quarter and Fiscal Year 2026 Financial Results (Exhibit 99.1) · Seagate via SEC EDGAR, 2026-07-28
  20. 20Apple posts worst day in over a year after MacBook and iPad price hikes · CNBC, 2026-06-25
  21. 21Xiaomi Profit Falls After Memory Crunch Hits Smartphone Demand · Bloomberg, 2026-08-18
  22. 22Nintendo hikes Switch 2 prices and expects console sales to decline as memory crunch bites · CNBC, 2026-05-08
  23. 23SK Hynix surpasses Samsung as South Korea's most valuable company · Quartz via Yahoo Finance, 2026-06-22
  24. 24SK hynix (000660.KS) historical prices · Yahoo Finance, 2026-10-09
  25. 25Samsung Electronics (005930.KS) historical prices · Yahoo Finance, 2026-10-09
  26. 26Samsung Electronics preferred (005935.KS) historical prices · Yahoo Finance, 2026-10-09
  27. 27Sandisk (SNDK) historical prices · Yahoo Finance, 2026-10-09
  28. 28Western Digital (WDC) historical prices · Yahoo Finance, 2026-10-09
  29. 29Seagate Technology (STX) historical prices · Yahoo Finance, 2026-10-09
  30. 30Kioxia Holdings (285A.T) historical prices · Yahoo Finance, 2026-10-09
  31. 31Xiaomi (1810.HK) historical prices · Yahoo Finance, 2026-10-09
  32. 32Nintendo (7974.T) historical prices · Yahoo Finance, 2026-10-09
  33. 33USD/KRW (KRW=X) historical prices · Yahoo Finance, 2026-10-09
  34. 34USD/JPY (JPY=X) historical prices · Yahoo Finance, 2026-10-09
  35. 35USD/HKD (HKD=X) historical prices · Yahoo Finance, 2026-10-09
  36. 36Samsung's HBM Market Share Jumps to 33%, Narrowing Gap With SK hynix (Counterpoint data) · Seoul Economic Daily, 2026-09-03
  37. 37Rambus Form 10-Q for the quarter ended June 30, 2026 · Rambus (SEC filing), 2026-07-28
  38. 38Rambus Reports Second Quarter 2026 Financial Results · Rambus, 2026-07-27
  39. 39Rambus shares crater after revenue miss, Baird warns of DRAM supply squeeze · Proactive via Yahoo Finance, 2026-04-28
  40. 40Rambus statistics (market value, forward P/E, analyst count) · Stock Analysis, 2026-10-11
  41. 41Micron statistics (market value, forward P/E, analyst count) · Stock Analysis, 2026-10-11
  42. 42Sandisk statistics (market value, forward P/E, analyst count) · Stock Analysis, 2026-10-11
  43. 43Daily closing prices, Sept. 2, 2025 to Oct. 9, 2026 (MU, SNDK, SK hynix, Samsung, Kioxia and each pick) · Yahoo Finance, 2026-10-09
  44. 44Camtek announces results for the second quarter of 2026 (Form 6-K) · Camtek (SEC filing), 2026-08-10
  45. 45Camtek receives over $105 million multi-system orders from a tier-1 OSAT and a leading HBM manufacturer (Form 6-K) · Camtek (SEC filing), 2026-06-02
  46. 46Camtek annual report 2025 (Form 20-F) · Camtek (SEC filing), 2026-03-19
  47. 47Camtek Ltd. Q1 2026 earnings call transcript (source of the $260 million HBM figure) · Insider Monkey, 2026-05-13
  48. 48Camtek statistics (market value, forward P/E, analyst count) · Stock Analysis, 2026-10-11
  49. 49Axcelis Technologies Form 10-Q for the quarter ended June 30, 2026 · Axcelis (SEC filing), 2026-08
  50. 50Veeco/Axcelis faces closer China antitrust scrutiny amid possible complaints · ION Analytics (DealReporter), 2026-03
  51. 51Axcelis statistics (market value, forward P/E, analyst count) · Stock Analysis, 2026-10-11
  52. 52Penguin Solutions Announces Fourth-Quarter and Full-Year Fiscal 2026 Results (Form 8-K, Exhibit 99.1) · Penguin Solutions (SEC filing), 2026-10-06
  53. 53Penguin Solutions statistics (market value, forward P/E, analyst count) · Stock Analysis, 2026-10-11
  54. 54WD Reports Fiscal First Quarter 2027 Financial Results (Exhibit 99.1) · Western Digital via SEC EDGAR, 2026-10-22
  55. 55Seagate Technology Reports Fiscal First Quarter 2027 Financial Results (Exhibit 99.1) · Seagate via SEC EDGAR, 2026-10-27