The Direxion Daily MU Bull 2X Shares (MUU), a leveraged exchange-traded fund designed to deliver twice the daily performance of Micron Technology Inc. (MU), recorded a 24h plunge of 6.11% by the post-market session on Monday. This decline occurred despite the fund posting a significant intraday gain during regular trading hours, highlighting a sharp reversal in sentiment.

The intraday strength was fueled by a continued surge in its underlying stock, Micron Technology. Analyst reports and market commentary pointed to an unstoppable rally in memory chips, driven by explosive artificial intelligence demand and a severe supply shortage. This sector-specific optimism led to Micron's stock hitting a record closing high, which was amplified by the fund's 2x leverage structure.

However, the post-market plunge suggests investors moved to lock in profits following the substantial rally. Broader market headwinds, including heightened geopolitical uncertainty after the U.S. rejection of a Middle East peace proposal and a consequent spike in oil prices, likely contributed to the risk-off move. This combination of profit-taking after a sharp run-up and renewed macro concerns explains the fund's sharp 24h downturn.