because, unlike typical convertible bonds, which get converted into shares only when a stock rises to a fixed price, the conversion price for these notes keeps getting adjusted downward whenever the underlying stock falls. The drop in the stock price also means the buyers are entitled to receive more shares when the conversion occurs.
The floating convertible feature is intended to be an embedded hedge to protect investors in the event the stock doesn't rise in price after the deal. But, in the past, some unscrupulous hedge funds that bought the bonds saw the floating conversion feature as an invitation to make money by literally shorting the stocks to death. In many cases, those hedge funds violated contract provisions forbidding any shorting of the company's stock. (Nobody has lodged such allegations about Cornell or NIR.)
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