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Recent reports from Bloomberg have shown, the hunt for rare-disease medicines has created a buying frenzy among deal makers as takeover valuations jump to the highest in at least 20 years.Alexander Raths/Getty Images/iStockphoto

With the second half of the year approaching and most benchmark U.S. stock indexes posting meagre gains in the 1 to 2 per cent range, it's tough to get too excited about this market. Unless, that is, you're sitting on shares that have already doubled so far this year. And believe it or not, they are out there: About 15 companies in the Russell 3000 index are up more than 100 per cent so far in 2015.

More than half of these members of the 100 Per Cent Club have one thing in common: They are biotechnology companies working on medicines for rare diseases, also known as "orphan drugs."

The orphan drug designation comes with many perks: Most of all sky-high prices and protection from generic competition for seven years. And the U.S. Food and Drug Administration has made no secret of the fact that it wants to stimulate development of orphan drugs, especially for sick children. As a result, the FDA approved a record 49 orphan drugs last year, according to the FDA Law Blog. As that blog said, "there's no indication of a slowdown any time soon," and drug makers are on pace to break the record for the number of orphan drug designation requests.

As recent reports from Bloomberg have shown, the hunt for rare-disease medicines has created a buying frenzy among deal makers as takeover valuations jump to the highest in at least 20 years.

Investment banks have their favoured lists of potential biotech targets. Goldman Sachs Group Inc.'s list in April included Alkermes PLC, Ariad Pharmaceuticals Inc., Atara Biotherapeutics Inc., BioMarin Pharmaceutical Inc., Clovis Oncology Inc., Synageva BioPharma Corp., Regeneron Pharmaceuticals Inc. and Vertex Pharmaceuticals Inc. That list, of course, has gotten shorter: Alexion Pharmaceuticals Inc. agreed to acquire Synageva for $8.4-billion (U.S.) this month, offering a 120 per cent premium to the stock price.

With the Nasdaq biotech index up more than 20 per cent this year, it's no wonder love for the group was all over the most recent survey from the American Association of Individual Investors even though more than 45 per cent of those polled had a "neutral" opinion of the overall market for an eighth straight week.

The health care sector was viewed most bullishly, by far: It was embraced by about 35 per cent of respondents with "favouritism shown toward biotechnology" and pharmaceuticals.

Of course, that much bullishness makes contrarians nervous. So it's easy to look at all of this and see a bubble, as J. Michael Pearson, Valeant Pharmaceuticals International Inc.'s famous deal-making chief executive officer, said last month of recent mergers.

However, if this is a bubble, when and if it bursts may be harder to predict than others. Investing in young biotechnology companies, many of which have no earnings and in some cases no revenue, is obviously a much different game than traditional Graham and Dodd-style stock picking. When it comes to traditional fundamental analysis, this is where the sidewalk ends.

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