Micron jumps, Einhorn reportedly discloses long position

• David Einhorn has reportedly disclosed at the Robin Hood Investors Conference Greenlight Capital has taken a long position in Micron (MU +3.4%).
• Given Greenlight's Q3 13F shows no position in Micron, any purchase from Einhorn would have occurred in Q4.
• The DRAM/NAND flash vendor's shares have already more than tripled YTD. They're currently close to their 52-week high of $19.88.