Amarin Corp Plc (AMRN)

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To fully understand how you can "collapse the box" you have to understand the dynamics of shorting. When you short what you are actually doing is borrowing the shares, and then selling it. To cover that short, you must buy the shares back and "return" them. Your goal should be to do it at a lower cost than you sold it at. If you acquire shares from the convertibles, you simply take those shares and use those to "return" the shares you originally borrowed.