Anavex Life Sciences Corp (AVXL)

[wildcard235]

I can't see raw SLB data, only a chart, which shows IB's SLB rate at 5.5% this morning, and it has ticked down to about 5.3%.

Interactive Brokers has access to more borrowing sources than any other brokerage, but even they don't have access to everything. If your brokerage is not IB, they may have trouble borrowing shares that IB does not have.

Normally, the harder it is to borrow shares of a stock, the higher the SLB rate is. That's the function of the SLB rate.

Also, I speculate that a high volume of trades (relative to shares outstanding) might temporarily take some shares out of the pool of available-to-borrow shares, between the trade and settlement.