AMD and Micron lifted chip funds. Equipment still lost the week

Advanced Micro Devices rose 8.5%, Intel 5.5% and Micron 4.2%, enough to lift VanEck's $74.1 billion semiconductor fund SMH 0.79% through Friday, September 18, even as Lam Research, Applied Materials and KLA fell 3.4%, 2.6% and 2.0%. State Street's equal-weight version of the same field, XSD, gained 0.22%.

Monday's drop and the four-session climb back were already on the record. The split inside the chain was not.

Amodei's pause and Tan's shortage

Frontier-lab chief executives Dario Amodei and Sam Altman called for pacing the most advanced AI models. The PHLX Semiconductor Index fell 5.9% on Monday, September 14. Lam Research fell 8.3%, Applied Materials 7.1%, ASML Holding 7.3%. Micron dropped 5.3%, Intel 5.6%, Nvidia 3.4%. SMH fell 4.8%; Invesco's PHLX tracker SOXQ fell 5.8%, in line with the index it follows. Yahoo Finance, writing during that session, said the comments threatened the toolmakers' order books.

Intel chief executive Lip-Bu Tan told the AI Infrastructure Summit in Santa Clara on Tuesday, September 15, that memory-chip prices have climbed five to seven times and that the bottleneck could worsen.

Wednesday, Reuters reported that SK hynix was in talks with Intel about making memory in the United States, including a possible lease at Intel's Ohio site; SK hynix said it is exploring options and that "no specific plans or arrangements have been finalized at this time." Intel rose 4.0% that session.

Micron jumped 5.5% Thursday to close at $977.50, then added another 3.9% Friday to $1,015.80, as Tan's remarks circulated. Intel rose 7.7% Thursday. AMD gained 6.4%. Equipment bounced on Friday, Lam 7.0% and Applied 6.5%, and still lost the week.

The index closed Friday at 11,921.69, up 0.83%.

Designers and memory paid. The tools did not

AMD was the designer that moved a fund. In SMH, its 6.0% weight contributed 0.51 percentage points to the week's 0.79% gain, more than Nvidia's 22.6% weight contributed with a 1.8% rise. Intel added 0.25 percentage points, Micron 0.23. Lam, Applied and KLA, 11.7% of the fund together, subtracted 0.31 percentage points. ASML, Qualcomm and Broadcom finished the week lower as well; Broadcom dropped 1.2%.

iShares' capped semiconductor fund SOXX gained 1.2% for the week on a total-return basis; SMH gained 0.79% on the same basis.

Nvidia sits above ASOXX's 8% cap between quarterly rebalances. AMD, Micron and Intel were the week's contributors. NXP, Lam, ON Semiconductor and Applied were the drags. ON fell 8.1% for the week; analog and industrial silicon ran on a different clock than high-bandwidth memory.

SMH is down 13.2% over three months, SOXX 16.6%, XSD 20.3%.

Applied, Lam and KLA still sit 34% to 42% below their 52-week highs. Micron is 19% below its own high at $1,255, even after this week's bounce. Nvidia, 6.0% off its high, did not have the same three months the toolmakers did.

Cap weight captured AMD. Equal weight did not

The funds that closed higher were the ones that owned more of AMD, Micron and Intel, and less of the middle of the chain.

The cap-weighted funds finished slightly higher. The equal-weight and dynamic versions of the same industry barely moved, or finished down. First Trust's factor-weight fund FTXL matched SOXX on the week because Intel is its largest holding, at 9.0%. Invesco's dynamic semiconductor fund PSI fell 7.9% on Monday, the steepest drop among the larger wrappers, and never got back to Friday, September 11.

If you hold SMH or SOXX, this was an AMD, Micron and Intel week. If you hold XSD, it was a wash: Semtech and MaxLinear helped, Lattice, Universal Display and Synaptics did not, and no name is more than 4% of the fund. Impinj, Skyworks and Qorvo sit at the top of that book.

Micron reports September 30

Roundhill's memory fund DRAM is the third-largest fund in the semiconductor category, $25.9 billion, five months after an April 2 launch. It is not a broad chip basket. Samsung Electronics is 18.6%, SK hynix 17.2%, and Micron shows up as total-return swaps on top of that. The fund rose 0.86% on the week after a 7.3% Monday drop. SK hynix's U.S.-listed shares still finished the week 1.4% lower. Micron's shortage bounce did not carry the Korean names with it.

Micron reports fiscal fourth-quarter results on Wednesday, September 30. The last print, on June 24, was $41.46 billion of revenue against a $35.91 billion estimate.

Tight memory is a price on chips already being made. Equipment is a price on adding the capacity to make more. Tan's five-to-seven-times prices, and Micron's week, speak to the first. Three months of mark-to-market on Lam, Applied and KLA speak to the second. A shortage does not, by itself, fill an order book for etchers and inspection tools. That order arrives when a producer decides the tightness will last long enough to justify more wafers. Micron's print on September 30 is where those two clocks have to meet.