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MDU Resources (MDU) was upgraded at Citigroup (C) from neutral to buy with a price target of $29, as the breakup of the company should be beneficial to shareholders.
Shares are higher by about 2.75 percent.
TripAdvisor (TRIP) was upgraded by Deutsche Bank (DB) form hold to buy with a price target of $50, as increasing competition among online travel agencies should benefit the company.
Shares are lower by about a quarter of a percent.