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phinds said:Yes, but I think you are ignoring the fact that this was NOT specifically because it had gone to 400 or any other price but because they didn't have the capital to cover further trades because of the total dollar volume on which they had to cover a 2-day float. If they had had the capital there would have been no reason for them to suspend trading regardless of the price.
But the reason they had a total dollar volume problem was because the price had gone so high so fast.
They have two days to settle. That makes this effectively a 2-day futures contract. If the stock is this volatile, the contract gets expensive - that is reflected in (or is another name for) the settlement fees. Settlement fees go way up, and a broker who has no way to pass these along to their client loses money with every trade. So they stop.