The VinFast VF e35 SUV.VinFast Shares in VinFast soared on its Spac-led debut in New York Tuesday, leaving it worth $85 billion. The Vietnamese EV carmaker has sunk since then, losing almost half its value. The net worth of VinFast's owner, Pham Nhat Vuong, has also plunged as a result. After a spectacular debut earlier this week, shares in VinFast have hit the skids.