Memory-storage sector split: MU, SNDK, WDC

What happened: Samsung's record earnings sparked profit-taking, sending Micron, SanDisk, and Western Digital down 7% or more on July 13, despite their strong year-to-date performances. SanDisk, up 635% YTD, surged again on July 15 after UBS, Citi, and BofA turned bullish on memory stocks, citing improved DRAM pricing forecasts and a healthy reset in SanDisk's share price after a 14% drop. Kioxia and SanDisk began production of 10th-generation 3D flash memory on July 3, with SanDisk expecting strong Q4 earnings and multi-year contracts to drive further growth.

Market impact: The memory-storage sector experienced a split, with Samsung's earnings driving a selloff in Micron, SanDisk, and Western Digital, while positive analyst sentiment and production milestones pushed SanDisk and Micron higher. The Roundhill Memory ETF and Seagate were also affected, with the entire memory sector experiencing volatility. Investors priced in supply glut concerns, but a rebound followed as analysts cited a structural memory shortage and strong demand from companies like Apple.

What to watch next: SanDisk's Q4 earnings report, expected in late October, will provide insight into the company's growth trajectory and catalyst for a 43% gain to reach $2,500 by 2027. Investors should also monitor Micron's Q4 revenue guidance, due in late August, and the ongoing production of 10th-generation 3D flash memory by Kioxia and SanDisk. Additionally, the memory sector's performance will be influenced by broader market trends and geopolitical factors affecting technology stocks.