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Micron, SanDisk Just Broke the Momentum Trade: SPMO Faces Its Worst Month Ever

Jul 21, 2026, 12:58 PM UTC · Primary ticker $SPMO

The Invesco S&P 500 Momentum ETF (SPMO) experienced its worst monthly decline in history, falling 10.54% in July, primarily due to significant drops in its largest holdings, Micron Technology and Sandisk. This event highlights the inherent risks of momentum investing when leading stocks reverse sharply, but historical data suggests potential short-term rebound opportunities for the ETF.

This filing details the Invesco S&P 500 Momentum ETF (SPMO) suffering its steepest monthly decline since its inception, down 10.54% in July. This was primarily driven by a sharp reversal in its top holdings, particularly Micron Technology (MU) and Sandisk (SNDK), which collectively accounted for over a third of the ETF's losses. The event highlights the 'winners turn' risk inherent in momentum strategies, where concentrated bets on previously strong performers can lead to significant drawdowns when those stocks reverse. While the short-term impact is negative for SPMO and its underlying tech components, historical data suggests that such deep momentum selloffs have often been followed by strong rebounds in the subsequent months, presenting a potential opportunity for patient buyers.

$SPMO negative Worst monthly decline in history
$MU negative Fell 25%, largest fund holding
$SNDK negative Dropped 36.33%, significant contributor to losses
$WDC negative Fell 34.68%, part of memory/storage selloff
$STX negative Fell 24.97%, part of memory/storage selloff
Source: benzinga
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