Reason: Over the week to Friday, October 9, $PLTR ran to 0.25% under its 52-week high at an overbought RSI, while $ARM fell hardest, with its worst day on October 8 when the AI-hardware cohort sold on a report that OpenAI's annualized revenue is about $50 billion (Financial Times, confirmed by CNBC). Every name still sits above its 200-day on a positive year, so the chip declines are pullbacks in intact trends; $PLTR and $AMZN still trail the index over the year.

Price/RSI Table

As of 2026-10-09. Status reads the 200-day trend first and RSI second; Action is a trend-hold lens: an extended name is never an entry, and a name below its 200-day with a negative year is not a dip.

What Changed Since 2026-10-02

• PLTR: up 10.75% on the week with RSI above 75, at its high. It moves from mixed to extended; its one-year gain is modest and still trails the index. Friday's 5.17% gain has no cause on file (news pulled October 8, before Friday's session; no October 9 captures; stock-events checked).
• ARM: down 13.4% on the week and now just under its 50-day, but 21% above its 200-day on a +56.03% year: a deep pullback in an intact trend, not a breakdown. On October 8, Benzinga had it lower before the open as Morgan Stanley set a $212 target at Equal-weight, and the AI-hardware cohort sold on the OpenAI revenue report (October 8 market brief). Friday's further decline has no cause on file.
• TSM: cooled from last week's overbought reading to RSI 52.4 and fell on the week. TSMC filed its September revenue report on October 8 (SEC 6-K; the figures are not on file).
• MRVL: rose 5.81% on October 6 after its investor-day guidance (The Motley Fool, per the October 6 market brief) and finished the week up 1.1%, 60.2% above its 200-day.
• AMZN: the short-term trend turned from weak to strong-up on a +4.34% week; Friday's 3.29% gain has no cause on file.
• NVDA: down 2% on the week; CNBC named it among the stocks that sank on the OpenAI report on October 8. Above its 200-day on a positive year.
• Roster unchanged since October 2: no entrants, no dropouts.

Watch

ARM building a flag back above its 50-day; PLTR resetting from overbought before anything here is an entry. TSMC is scheduled to report third-quarter results on October 15, the group's next dated test.

Sources

• Tape data (price, RSI, returns, one-year change, distance to the 200-day): pre-computed summaries as of the 2026-10-09 settled close, summaries (Massive/Polygon).
• Prior edition (format and roster only): 2026-10-02-ai-infra.
• Event checks: research/stock-events/ (nothing dated October 5-9 for these names; TSMC October 15 report scheduled), the 2026-10-05 through 2026-10-08 market briefs under research/issues/, research/capture/ for October 5-9 (no October 9 article or social captures on file); news receipts under stocks/news/latest.json` (PLTR, NVDA, ARM, AMZN pulled 2026-10-08; MRVL 2026-10-07; TSM 2026-10-05); TSMC 6-K, October 8 — https://www.sec.gov/Archives/edgar/data/1046179/000104617926000680/tsm-revenue20261008.htm.
• Primary links: Financial Times, OpenAI annualized revenue — https://www.ft.com/content/b66a9858-f8fb-46cb-b506-44bfe26fca2a; CNBC, AI stocks sink on OpenAI revenue report — https://www.cnbc.com/2026/10/08/open-ai-revenue-nvidia-oracle-coreweave.html; Benzinga, Arm — https://www.benzinga.com/trading-ideas/movers/26/10/62243612/why-is-arm-stock-falling-thursday.