Premarket Movers: H&R Block rises, Myriad falls

The stock added $1.78, or 8.5 percent, to $22.60.

Shares of Myriad Genetics Inc. fell 5.4 percent to $45.35 after the biotechnology company said it will end development of its Alzheimer's treatment candidate Flurizan, which failed to meet goals of a late-stage trial.

Record prices for a barrel of crude sent shares of United Airline parent UAL Corp. 3.4 percent lower to $5.37. Oil prices surged above $143 a barrel Monday as supply concerns and a weakening global economy continue to push the price of crude oil to new highs. Airline stocks often trade inversely to the price of oil because fuel represents a major operating cost.

Network services provider Level 3 Communications Inc. fell in the early going after a Citi Investment Research analyst downgraded the stock, saying shares may be overpriced due to poor prospects for the telecommunications services sector as a whole. Shares lost 2.2 percent to $3.05.