To: Eddie Kim who wrote (72895 ) 10/19/1998 6:24:00 PM From: nihil Respond to of 176387
RE: % of options expiring valueless This is a complex problem and cannot be resolved without extensive research. I cannot find any serious studies of the profitability of floor or public trading. The studies of futures trading that have been published over the last 60 years show beyond question that public customers get cleaned, while the commission houses often end up bankrupt. Sort of a weird business, that emerged, I guess from commission maintenance and might even have changed since discounting. I think the problem in the present dispute is that those of us who think we are making money trading options --- at least can afford to keep losing it -- know that 90 per cent of our options purchases do not expire valueless. I think the profitable strategies are to sell out positions when they show a loss (thus the importance of trading close to the bid and ask) and letting positions run when they increase in value. This means that price of the underlying has to grow faster than time decay, volatility decay penalty, and uncaptured spread decrease price. A second problem is that the open interest changes dramatically over time. Buying deep-in-the-money bullish call spreads is one of the most profitable and most boring trades one can imagine. If you cover them with deep-out-of-the-money puts (in a uptrending stock like Dell) you can sometimes achieve a perfect hedge at a credit for the total trade. This something usually reserved to the floor trader and rarely will a customer be able to complete the trade at a sure profit. The point is spreaders on the floor look out for these things and they can swell both volume and percentage ending in the money. The volume in the deep in the money calls mushrooms as expiration approaches. The third problem is that open interest at expiration is always less than life-of-contract maximum daily open interest. For instance, in Dell October calls, 28,731 are listed as open interest with a strike below the underlying close (56 11/16). 87,995 contracts are listed at strikes over the closing underlying price, suggesting that about three fourths of the calls expired worthless. There is a problem, on an earlier print, September 29, you can see there are thousands of contracts open at the 70's and 80 which obviously expired worthless but were not active enough to be listed. The number of some strikes on October 18 is less than the number listed on the 9/29 print -- demonstrating that, unlike matter and energy, options can both be created and destroyed. I hope some untenured assistant professor of finance can get access to the data that can determine for whom and how much option trading is profitable.