Reason: ARM round-tripped: Wednesday's file had it at RSI 71.1, extended after a five-session run; Thursday it fell 7.88% on 1.94x volume with no cause on file, cooling its RSI to 61.2 and its status back to a pullback rather than extended — still +120.63% on the year at +46.5% against its 200-day (the tape now reads it intact-but-priced). MRVL keeps building the group's real structure: +212.54% on the year, +61.2% against its 200-day, +7.24% on the week. PLTR added another 6.77%, still the year's laggard at +5.89% (alpha -11.33). NVDA (+1.26%) and TSM (+3.67%) were quiet. AMZN is now the clear laggard, extending its slide to -1.59% on the week and -4.08% on the month, alpha -2.77. Roster unchanged.

Price/RSI Table

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 2026-09-23

• ARM: RSI moved from 71.1 (Extended, +36.31% for the prior week) to 61.2 after Thursday, September 24, when it fell 7.88% on 1.94x volume with no cause on file per the desk's own Thursday brief. Net for this window it is +12.59%, +46.5% against its 200-day, +120.63% on the year — a pullback inside a still-intact trend, not the extended read Wednesday flagged.
• MRVL: +7.24% week, +212.54% on the year, +61.2% against its 200-day — no new dated cause; its pull (refreshed September 22) still returns quote pages only, pointing back to the August 31 earnings call as the last real event.
• PLTR: +6.77% week, +6.86% month, still the group's flattest year at +5.89% (alpha -11.33); its pull (refreshed September 25) carries only aggregator debate pieces dated September 21, no new catalyst.
• TSM (+3.67%) and NVDA (+1.26%) both extended quietly. TSM's pull remains stale since July 21; NVDA's (refreshed September 25) returns only the already-known September 21 item (SB Energy financing, Trump-Xi summit optimism).
• AMZN is now the group's clear laggard: -1.59% week, -4.08% month, alpha -2.77 — its pull (refreshed September 25) returns aggregator quote pages only, no new dated cause.
• Roster unchanged since September 23: no entrants, no dropouts.

Sources

• Tape data (price, RSI, returns, one-year change and alpha, distance to the 200-day): pre-computed summaries as of the 2026-09-25 close — ai-infra (Schwab).
• Prior edition (format and roster only): 2026-09-23-ai-infra.
• ARM's Thursday reversal and cause-unknown finding: 2026-09-24-market-brief.
• News checks: latest, .../PLTR/news/latest.json, .../NVDA/news/latest.json, .../AMZN/news/latest.json (all pulled 2026-09-25), .../MRVL/news/latest.json (pulled 2026-09-22), .../TSM/news/latest.json (pulled 2026-07-21, stale).