You do realize that if your shares are not in a margin account, your brokerage firm can not lend them out, right? Talk with your broker to find out the guidelines of whether or not they can lend out your shares. Also ask them their guidelines of what they can and can not lend out. 99% of firms won't lend out low value shares like REGEN. Too much risk for them. You'd think that people would understand that the only way a firm can lend out your shares is either with your blessing by filling out stock lending forms or if you own shares on margin. This idea of locking in your shares is an absolute farce.
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