Biotechnology Stocks (*RXBIO)

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Pro portfolios track the top 15 quarterly holdings of more than 1,400 institutions. Comments in Pro portfolios show the institution's change in shares held for each company quarter over quarter.

Pro portfolio performance is based on institutions' top 15 holdings as disclosed in quarter-end filings with the SEC. Pro performance does not take into account additional holdings beyond the top 15 nor does it include positions that are not required to be disclosed by the SEC. As such, Pro portfolio performance should be considered an approximation and not a precise record of how an institution has performed over time.

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Primary portfolio

We look at the recent net stock adds (people adding a stock to their portfolio minus people removing it) and compare against the company's previous history to identify those companies that are seeing the largest changes on a relative basis. Without the company history comparison, our most followed companies would likely be near the top of the list at all times. A value greater than one indicates a greater than normal number of adds over the last seven days, and a value less than one indicates a less than normal number of adds. If no value is shown, there was not enough activity to generate a value.

We look at the recent net stock shorts (people shorting it in their portfolios minus people covering their short) and compare against the company's previous history to identify those companies that are seeing the largest changes on a relative basis. A value less than -1 (for example -3.6) indicates a greater than normal number of shorts over the last seven days, and a value greater than -1 (for example -0.6) indicates a less than normal number of adds. If no value is shown, there was not enough activity to generate a value.

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Let us know which tickers should be added or removed from the Biotechnology Stocks Index (*RXBIO).

Note: Our tickerspy research team will look at all recommendations but not all of them will be implemented. As a general rule, stocks with a market cap below $50 million will not be included.

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Note: Our tickerspy research team look at all recommendations but not all of them will be implemented. As a general rule, stocks with a market cap below $50 million will not be included.

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