U.S. semiconductor storage stocks experienced a significant decline in pre-market trading on March 19, with Micron Technology (MU) falling nearly 5% and SanDisk (SNDK) dropping over 5%, according to Hyperinsight monitoring. Despite the downturn, major long positions on-chain have remained unchanged. SanDisk's largest on-chain long position, valued at $7.15 million, shows an unrealized profit of approximately $840,000, reflecting a 30% gain since its opening on March 11 at an average entry price of $630. Meanwhile, the largest long position on the Micron Technology chain, linked to Continue Capital, holds a position size of $6.63 million with an unrealized profit of $850,000, marking a 57% increase since its entry on February 6 at an average price of $383.