Reason: Over the week to Friday, October 16, all six names fell and all six still close above their 200-day: $MRVL (down 17.24%) and $ARM (down 14.45%) fell hardest, $PLTR gave back 11.01% from a high it was 0.25% under a week earlier, and the cushions over the 200-day thinned to 1.9% for $ARM, 3.0% for $AMZN, 4.4% for $TSM and 5.5% for $NVDA. Bloomberg called the week the S&P 500's biggest weekly loss since June, with worries about the viability of the AI trade pressuring chipmakers (October 16). These are pullbacks in intact trends; $PLTR's +4.44% year still trails the index.

Price/RSI Table

As of 2026-10-16. Status reads the 200-day trend first and RSI second; Action is a trend-hold lens: a pullback inside an intact trend is a flag to wait for, not an entry, and a name below its 200-day with a negative year is not a dip.

What Changed Since 2026-10-09

• PLTR: down 11.01% on the week (7.22% on Friday alone) to RSI 46.3, from overbought and 0.25% under its high to 12.64% under it. It is 21.9% above its 200-day ($152.65), but a +4.44% year trails the index (alpha −11.09 points): the thinnest year in the group. Cause not on file: its news was last pulled October 9, before the week's sessions, so news was not pulled for this move; three Form 4 filings dated October 13 and 14 are on file, contents unread.
• MRVL: down 17.24% (5.56% on Friday), the deepest drop in the group, to RSI 37.5. It is 29.6% above its 200-day ($175.86) on a +158.22% year: a deep pullback in an intact trend. News was last pulled October 7, so not pulled for this move; four Form 4 filings dated October 16 are on file, unread.
• ARM: down 14.45% (6.94% on Friday) to RSI 34.5, 1.9% above its 200-day ($223.44) on a +33.07% year and 49.68% under its high: the thinnest cushion in the group. News pulled October 16 holds nothing newer than October 5, and no October 12–16 article headline or excerpt on file names it; cause not on file.
• TSM: reported on October 15 and still fell. TSMC's results page shows third-quarter revenue of $46.72 billion against its own $44.6–45.8 billion guide and fourth-quarter guidance of $52.3–54.3 billion; provider-reported EPS was $4.60 against $4.52 (October 15 market brief). The stock fell 1.8% on 2.25 times normal volume Thursday and 2.28% on Friday, down 8.98% on the week, RSI 34.2, 4.4% above its 200-day ($395.05). MarketBeat's summary of the print points to valuation and capital-spending concerns; that is an aggregator's reading, not a filing.
• NVDA: down 6.61% to RSI 37.5, 5.5% above its 200-day ($202.97) on a +17.78% year with the thesis rated intact. CNBC described a global tech-hardware rout on AI funding worries on October 15, naming Nvidia, AMD and Dell. It is the mildest drop among the chip names here, and the cushion has shrunk from 13.4% a week ago.
• AMZN: down 4.74% to RSI 45.0, 3.0% above its 200-day ($242.73); the regime read moved from uptrend to pullback on Friday with the thesis rated intact. The Buildout relayed on October 12 a Wall Street Journal report that Amazon is in talks to buy Decart AI for about ¥1.1 trillion; no source ties the week's price to it.
• Group read: the lane fell with the semiconductor fund (down 10.53% on the week, 5.6% above its 200-day on a +57.24% year). No name was an entrant or dropout since October 9.

Watch

The 200-days are the lines: $NVDA $202.97, $TSM $395.05, $ARM $223.44, $AMZN $242.73, $MRVL $175.86, $PLTR $152.65. A close under any of the four thin ones turns a pullback into a trend test; a flag above them is the setup. Amazon is scheduled to report October 29 (provider date), after Microsoft and Alphabet on October 28.

Sources

• Tape data (price, RSI, returns, one-year change, distance to the 200-day): pre-computed summaries as of the 2026-10-16 settled close, summaries (Massive/Polygon).
• Prior edition (format and roster only): 2026-10-09-ai-infra.
• Event checks: research/stock-events/ (Amazon October 29 report scheduled; nothing else dated for these names), the 2026-10-15 market brief under research/issues/, research/capture/ for October 12–16 (Form 4 filings for PLTR and MRVL listed above); news receipts under stocks/news/latest.json` (NVDA, TSM, ARM and AMZN pulled 2026-10-16; PLTR 2026-10-09; MRVL 2026-10-07).
• Primary links: Bloomberg, S&P 500 suffers worst week since June as AI fears hit chipmakers, October 16 — https://www.bloomberg.com/news/articles/2026-10-16/s-p-500-steady-as-warsh-boosts-expectations-of-rate-hold; CNBC, Nvidia, AMD, Dell sink in global tech rout on AI funding worries, October 15 — https://www.cnbc.com/2026/10/15/sk-hynix-samsung-softbank-stocks-asia-tech-rout-ai-funding-worries.html; TSMC, third-quarter 2026 results — https://investor.tsmc.com/english/quarterly-results/2026/q3; The Buildout, Amazon–Decart report (relayed X post) — https://x.com/zubo_semicon/status/2109740605568110657.