Such is the risks or rewards of trading in IPO stocks , like Grab.
Of course, nobody knows how it is going to turns out and that is why it is speculative. The 3 fold jump from 5+ to 16+ was not sustainable and we can see from the candles that the buying power was weakened as more sellers come to drive the prices down.
On 8th Nov, it managed its resurrected move to meet its previous high before witnessing its doomsday downfall over the last 4 weeks. I expect the price to continue falling to the 5.71 level before a possible rebound.