I love the EFP from IB and i am all in on this product. But i've been thinking about a potential disaster scenerio. Could the spread actually go up as time pass? For example, MYL sept EFP spread right now is 0.0784. If MYL doubles in share price in the next week, the spread could actually double to around 0.16 give or take to reflect the same 5.50% yield. Not only the spread rise, and now you are down $1500 from the short futures position. As jimrockford previous suggested, we should unload some EFP as our balance start to get negative, but will we be actually be offseting the short EFP at a loss if the stock rise a lot even though time has pass? This is the only potential risk i see from the EFP. With that being said, i still like the EFP because the risk of a stock doubles in a short period of time isnt that big.