How much did ARM move each index today?
NASDAQ 100: ARM moved −3.27% and contributed −5.2 points against the index's +157.3-point move, offsetting 3% of it, ranking #95 of 100 members by contribution to the move.
SMH: ARM moved −3.27% and contributed −0.25 points of the index's −3.94-point move (6% of it), ranking #6 of 24 members by contribution to the move.
ARM closed the 2026-10-09 session at 266.28; that day's move sits in the 19th percentile of its own past year. The stock is 39.4% below its 52-week closing high and +143.6% for the year so far.
ARM in the NASDAQ 100 beyond today
| window | ARM return | points contributed | index move | rank |
|---|---|---|---|---|
| 1 week | −13.40% | −34.0 pts | +75.2 pts | #97 of 101 |
| 1 month | +4.76% | +3.5 pts | +1,779.6 pts | #41 of 101 |
| quarter to date | −8.07% | −24.9 pts | +474.7 pts | #98 of 101 |
| year to date | +143.60% | +64.8 pts | +5,633.3 pts | #18 of 101 |
Who moved with and against ARM today?
On ARM's side of the NASDAQ 100 tape: AAPL (−29.8 pts), NVDA (−15.6 pts), TMUS (−13.2 pts). Pulling the other way: MSFT (+50.0 pts), AMZN (+48.8 pts), GOOGL (+22.3 pts).
Every member's contribution, top to bottom, is on the index dashboards; the day's story is in the market-close note. Machine-readable figures for this stock: /api/stock/ARM, free to cite with attribution.