Advanced Micro Devices falls 10.9% on 30 October
Advanced Micro Devices closed down 10.9% on 30 October 2026, its largest one-day fall since 4 February 2026. The closes, the trading volume and what the company filed with the SEC around the move.
Checked before publishing: software matched every figure in this piece to the data it came from (Yahoo Finance daily closes for AMD (delayed); Yahoo Finance daily closes for the 50 companies (delayed)). How we check
Written by software from the data shown, at 07:51 ET on 31 October 2026. Not edited before publication. How this is made
Corrections (the text below is as first published)
- 2026-10-31: The “base rate” section counted earlier one-day moves of this size at the 50 largest US companies and how many of those stocks were higher 20 sessions later. It did not compare them with the other large stocks over the same sessions, it counted several moves on the same day (such as the April 2025 sell-off) separately, and it used today’s largest companies, which are survivors. Measured against the other large stocks over the same 20 sessions, stocks after moves like these did better only about half the time, so the section said less than it seemed to. It is removed from later notes; the stock’s own earlier moves are still listed, as dates.
Written by software from the data shown; not edited before publication
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Advanced Micro Devices, Inc. (AMD) shares fell 10.9% on 30 October 2026. Below are the closes, how unusual the move was, and what the company filed.
The move
Advanced Micro Devices closed at $504.80 on 30 October 2026, down 10.9% from $566.42 on 29 October, its largest one-day fall since 4 February 2026. About 39.6 million shares traded on 30 October, 2 times the average of the 20 sessions before. In the 20 sessions to 29 October its daily changes had a standard deviation of 3.6% (20-day realized volatility of 57.5% a year), so the move on 30 October was about 3.0 times a normal day.
What the company filed
Advanced Micro Devices filed no current, quarterly or annual report with the SEC from 26 October to 30 October, according to EDGAR.
The base rate
In the daily closes we hold for the 50 largest US companies, there were 70 earlier one-day falls of 8% or more that were also at least 3 times a normal day, at 38 companies, the latest on 14 September 2026. Five sessions later the median stock was up 0.6% from its close on the day of the move; 20 sessions later it was up 6.5%, and 54 of the 70 closed above that day’s close. Advanced Micro Devices itself did this 2 times before in that period; 20 sessions after, it was down 0.4% (4 February 2026) and up 5.3% (3 April 2025). This counts what happened before, across different companies and markets; it is not a forecast.
What this note does not say
The filings do not give a reason for the share price move, and neither do we: this note puts the closes and the filings side by side. Every quarter Advanced Micro Devices has filed, each linked to its filing, is on the AMD page at /s/amd.
Sources
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Sources: Yahoo Finance daily closes and volumes (delayed) and the company’s own SEC filings. The volatility, volume and free cash flow comparisons are our calculations. General market information, not investment advice.
Note: Articles and community posts on PYE Markets are for educational and informational purposes only and are not financial advice.
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