AR
ARM
-7.6%⚪ No clear catalystArm Holdings plc · Technology
$226.25Vol 4.79M · 0.8× normalMkt cap −$19.80BMarket closed — 2026-10-16 session
What happened
Move
-7.6%
Price
$226.25
Volume
4.79M
0.8× normal
Market cap
$241.63B
−$19.80B today
Why it moved
No clear catalyst identified
No reliable news, earnings or analyst driver was found for this move. Likely flow-driven.
Verdict — was the move justified?
⚪ No clear catalyst
No reliable catalyst was identified for this move.
How unusual is this move
σ score
1.3σ
vs own 20d volatility
Percentile
92th
of 775 daily moves
Avg daily move
±3.3%
own 5y average
vs sector
-4.4%
beyond sector median
Today’s move is among the largest 8% of ARM’s daily moves over the last 5 years — while the sector moved -3.2% and the market -0.3%.
What happened after similar moves
71 similar down moves in ARM’s 5-year history:
After 5 days
+2.4%
59% higher
After 20 days
+1.9%
54% higher
Median of same-direction moves within ±35% magnitude band. Past patterns don’t predict outcomes — context, not signal.
Fundamental context
V 17G 85P 64H 93Q 84
Insider activity (90d): net selling $5.78M
Valuation context
P/E (TTM)
269.1
5y median 252.0
P/E percentile
53%
vs own 3y history
FCF yield
0.0%
Valuation sits near the middle of its own historical range (53th percentile).
Full fundamental analysis on PreMarketPrice
Pillar scores, financial statements, valuation history, news & more for ARM