Buy-ins on t+3 are common with many brokers, but the big exception seems to be Interactive Brokers. They seem to have a powerful algorithm for matching short positions to available borrows, and execute buyins on a first in, last out approach. My first MDBX short survived six weeks, the second three days, the third six days. My current short position is one day old. I have been short almost continuously since $47. I was not looking for borrows before then. I intend remaining short until MDBX reaches a reasonable pps based on fundamentals. There is still a lot of down side!
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