Chapter 20 – Hedge Funds
Suppose a fund finds a positive alpha stock but the fund expects the overall market to fall. This
is called fundamental risk. The solution is to buy the stock and sell stock index futures to drive
the effective stock beta to zero. By doing so the fund would engage in a ‘market neutral’ pure
play. When this strategy is combined with a passive investment in an index or sector this is
called alpha transfer, hence the term portable alpha. The following pure play example is also in
the text and can be used to illustrate alpha capture; however the example is somewhat technical
and relies on several topics not developed in this chapter. The example employs a stock hedge
ratio and uses spot futures parity that is covered in Chapter 17.
Step 1: Find the ending dollar value of the portfolio based on the given information.
The hedge ratio must do two things: First, it must adjust for the difference in size in the spot and
futures position. Obviously with a fixed contract size, a bigger spot position (the stock portfolio)
will require a greater number of contracts. Second, the ratio must adjust for relative price
fluctuations of the spot and futures. The portfolio beta is just such a relative price adjustment
measure.
Step 2: Find the profit from the short futures position used to hedge out market risk: