The New #156 Most Shorted S&P 500 Component: Mallinckrodt

The most recent short interest data has been released for the 11/15/2016 settlement date, and we here at Dividend Channel like to sift through this fresh data and order the underlying components of the S&P 500 by "days to cover." There are a number of ways to look at short data, for example the total number of shares short; but one metric that we find particularly useful is the "days to cover" metric because it considers both the total shares short and the average daily volume of shares typically traded. The number of shares short is then compared to the average daily volume, in order to calculate the total number of trading days it would take to close out all of the open short positions if every share traded represented a short position being closed.

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In our new rank based on the most recent short interest data, Mallinckrodt plc ( MNK) has taken over the position of #156 most shorted S&P 500 component, from Stryker Corp. ( SYK) which is now in the #259 spot. The "days to cover" at 11/15/2016 was 3.56 for MNK, and 2.65 for SYK; this compares to the average across all S&P 500 components of 3.27 (down from the average back on the 10/31/2016 settlement date of 4.30). The chart below shows the movement over time of the "days to cover" values of both MNK and SYK, versus the average S&P 500 component.

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Below is a chart showing the relative positions of MNK versus SYK over time within the 500 S&P 500 components, with #1 representing the component with the highest "days to cover" value (most heavily shorted) and #500 representing the component with the lowest "days to cover" value (least heavily shorted):

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