Taking into account 30 trading days horizon, Eni SpA is expected to under-perform the Hess. But the stock apears to be less risky and, when comparing its historical volatility, Eni SpA is 1.42 times less risky than Hess. The stock trades about -0.37 of its potential returns per unit of risk. The Hess Corporation is currently generating about -0.23 of returns per unit of risk over similar time horizon. If you would invest 5,154 in Hess Corporation on April 26, 2012 and sell it today you would lose (485.00) from holding Hess Corporation or give up 9.41% of portfolio value over 30 days.
Diversification
Average diversification
Overlapping area represents amount of risk that can be diversified away by holding Eni SpA and Hess Corp. in the same portfolio (assuming nothing else is changed)