CookieStocks
ON +6.3%: an unusually large move for this stock. ON SEMICONDUCTOR CORP moved 5.2 points more than its sector, on 1.7× its usual volume.

2026-10-02 · ON

ON +6.3%: an unusually large move for this stock

ON SEMICONDUCTOR CORP moved 5.2 points more than its sector, on 1.7× its usual volume.

The story in plain words

Friday, October 2, 2026. ON +6.3%: an unusually large move for this stock. ON SEMICONDUCTOR CORP moved 5.2 points more than its sector, on 1.7× its usual volume.

What the data shows for ON Semiconductor (ON): ON +6.3% today. Its sector fund (XLK) +1.0% today. S&P 500 (SPY) +0.7% today.

Worked out from that data: 5.2 points more than its sector. Volume 1.7× its 20-day average. Bigger than 92% of its daily moves over the past 250 trading days.

Possible contributors. These line up in time with the move; they are not confirmed causes: News: “Top Midday Gainers” (Published around the move. Timing only, not a confirmed cause). News: “Sector Update: Tech Stocks Gain Friday Afternoon” (Published around the move. Timing only, not a confirmed cause). RW filed (Filed around the move. Timing only). DEFA14A filed (Filed around the move. Timing only).

About the company: ON Semiconductor trades as ON and is part of the S&P 500, in the Information Technology sector (Semiconductors), headquartered in Phoenix, Arizona, founded in 1999.

This is one of CookieStocks’ daily stock stories about unusually large one-day price moves in S&P 500 stocks, measured against each stock’s own history, its sector and its usual volume. Stories are found automatically each trading day from market data and SEC filings, and every claim is labelled as observed, calculated or a possible contributor. Statistics only, not investment advice.

Prove it

Every claim on the graphic, labelled: observed (straight from the data), calculated (worked out from it), or possible contributor (lines up in time, not a confirmed cause).

  • OBSERVED
    ON +6.3% todayOct 2, 2026, 4:05 PM ET
  • OBSERVED
    Its sector fund (XLK) +1.0% todayOct 2, 2026, 4:05 PM ET
  • CALCULATED
    5.2 points more than its sectorHow: stock return − sector fund return · Oct 2, 2026, 4:05 PM ET
  • OBSERVED
    S&P 500 (SPY) +0.7% todayOct 2, 2026, 4:05 PM ET
  • CALCULATED
    Volume 1.7× its 20-day averageHow: today’s volume ÷ average of the last 20 days · Oct 2, 2026, 4:05 PM ET
  • CALCULATED
    Bigger than 92% of its daily moves over the past 250 trading daysHow: share of past daily moves smaller in size · Oct 2, 2026, 4:05 PM ET
  • POSSIBLE CONTRIBUTOR
    News: “Top Midday Gainers”Published around the move. Timing only, not a confirmed cause. · Oct 2, 2026, 1:55 PM ET
  • POSSIBLE CONTRIBUTOR
    News: “Sector Update: Tech Stocks Gain Friday Afternoon”Published around the move. Timing only, not a confirmed cause. · Oct 2, 2026, 1:48 PM ET
  • POSSIBLE CONTRIBUTOR
    RW filedFiled around the move. Timing only. · Source: SEC EDGAR · Oct 2, 2026, 4:00 PM ET
  • POSSIBLE CONTRIBUTOR
    DEFA14A filedFiled around the move. Timing only. · Source: SEC EDGAR · Oct 1, 2026, 4:00 PM ET

ON Semiconductor (ON) financials and filings →

More stories

Statistics only, not investment advice. Past moves don’t predict future ones. Data as of Oct 2, 2026, 4:05 PM ET.