ON Semiconductor Drops 8.5% in One Session, Shedding ~$2 Billion
As seen on the 24/7 Wall St. homepage on September 16, 2026.
An 8.5% single-session slide to $68.11 knocks roughly $2 billion off the chipmaker's market value, and moves that size are rare for this name. The $74.42 open is now the level bulls need to reclaim.
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ON Semiconductor held a relatively tight band for most of the session before breaking down in the final stretch of regular trading, closing with a full-day loss of roughly 8.5%.
A move of that magnitude is unusual for ON by its own historical standards. The roughly $2 billion erosion in market value in a single session is the kind of damage that typically takes more than one trading day to recover, particularly when the stock needs to climb back above a prior open of $74.42 to reassure bulls that the trend has reversed.
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The steepest part of the decline arrived late in the session, which means investors who were willing to hold through midday still took the brunt of the loss. That late-day acceleration reflects institutional selling or stop-loss orders triggering in a cascade once a key price level breaks.
For investors following ON, the $74.42 open now serves as the clearest near-term reference point. Reclaiming that level would signal that buyers absorbed the session's damage; failing to approach it in subsequent sessions would suggest the stock is establishing a new, lower trading range.
Sources
Mentioned: ON