Put in a $15 GTC(Good Til Cancelled) sell order. They can't borrow shares that have an order on them. You can try to place higher sell price if your brokerage will let you. Some brokerages place limits on them
You do realize this entire thread consists of posts by people that have NO CLUE - - - but if ignorance is your thing - - have at it - - -
"Many retail investors think by placing a Good Till Canceled order (GTC) they can prevent their shares from being lent. This is more of a myth than reality. While some brokers may act as such, most don't recognize an open order as prohibitive of lending shares.
The surest way to prevent lending of shares is to have shares in a "Cash" a.k.a. "Type 1" account. Some brokers like Fidelity Investments allow positions to be in Type 1 and Type 2 (Margin) in the same account. Some like Scottrade do not allow mixing of Type 1 and Type 2 in the same account so a customer has to open two separate accounts, one as Cash and one as Margin.
The best way to prevent borrowing of shares is to have all of one's shares in a Cash account, or transfer the shares to the Transfer Agent, or get a certificate. "