Bitcoin MicroStrategy 2X Leveraged ETF Sees Massive Inflows In First Week Of Trading As MSTR Outperforms Bitcoin IceLoungeMedia IceLoungeMedia Seven days after hitting the market, the T-REX 2X Long MSTR Daily Target ETF (MSTU) has become one of the most successful new exchange-traded funds (ETFs) on the market after attracting over $72 million.