- By Tiziano Frateschi

Andreas Halvorsen (Trades, Portfolio) is a founding partner of Viking Global Investors LP and currently serves as its CIO. During the second quarter, he traded the following stocks according to GuruFocus Real-Time updates.

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• RICE 15-Year Financial Data

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The guru bought 75,000,000 shares in Axovant Sciences Ltd. (AXON) with an impact of 4.14% on the portfolio.

The company is a clinical-stage biopharmaceutical company focused on the acquisition, development and commercialization of novel therapeutics for the treatment of neurodegenerative disorders.

During the last quarter it reported successful completion of a drug-drug interaction study of intepirdine (formerly RVT-101) with memantine and strong balance sheet with $276.3 million of cash to support the company's current development plans.

GuruFocus gives the stock a profitability and growth rating of 2 out of 10. Financial strength has a rating of 4 out of 10 with no debt.

Another notable shareholder among the gurus is PRIMECAP Management (Trades, Portfolio) with 0.77% of outstanding shares.

Halvorsen bought 16,013,540 shares in Arbutus Biopharma Corp. (ABUS) with an impact of 0.27% on the portfolio.

The company is a biopharmaceutical business engaged in advancing novel RNA interference therapeutics and discovering, developing and commercializing a cure for patients suffering from chronic hepatitis B infection.

The non-GAAP net loss for first quarter 2016 was $9.9 million (19 cent loss per common share) and net loss was $15.9 million (31 cents basic and diluted loss per common share).

GuruFocus gives the stock a profitability and growth rating of 2 out of 10. Financial strength has a rating of 6 out of 10 with no debt.

PRIMECAP Management (Trades, Portfolio) is another notable shareholder of the company among the gurus with 7.05% of outstanding shares, followed by Jim Simons (Trades, Portfolio) with 0.51%.

Halvorsen increased his stake in Calpine Corp. (CPN) by 95.75% with an impact of 0.62% on the portfolio.

The company is a wholesale power producer. The company owns and operates natural gas-fired and geothermal power plants in North America. It sells wholesale power, steam, capacity and ancillary services to utilities, independent electric system operators.

First quarter operating revenues decreased 1.9% from the same quarter of a year before and adjusted EBITDA grew 10.7%.

GuruFocus gives the stock a profitability and growth rating of 7 out of 10 with ROE of 1.54% and ROA of 0.26% that are underperforming 62% of the companies in the Global Utilities - Independent Power Producers industry. Financial strength has a rating of 3 out of 10, with cash to debt of 0.02 that is below industry median of 0.19.