The advantage of locking down your shares has been discussed and debated here and elsewhere. Posters who work much harder at analyzing the possible misdeeds of shorters and who understand the process much better than I, may wish to answer your question. Regardless of the true volume of short holdings, legal and naked, and bearing in mind that the effectiveness of locking down shares is uncertain at best, the effort required to put up this modest defense is tiny and worthwhile. I’ve placed my substantial position in limited sell Good for 60 at $100. If it does nothing to combat the shorts so be it. If it frustrates their efforts and costs them even a penny more per share to escape their position, good. The effort to lock is trivial. Lock your shares.