Tuttle Capital's Concentrated Memory Stack ETF (HBMX) Adds Exposure to CXMT, the $488 Billion Chinese Memory Maker Many U.S. Investors Can't Access Directly CXMT's blockbuster Shanghai debut put a half-trillion-dollar price tag on the memory bottleneck HBMX was built to seek exposure to. Advertisement 2 Story continues below This advertisement has not loaded yet, but your article continues below. Please try againArticle contentAdvertisement 3 Story continues below This advertisement has not loaded yet, but your article continues below. Article content Memory has become one of the principal constraints on AI infrastructure. Advertisement 7 Story continues below This advertisement has not loaded yet, but your article continues below.