To: Andrew N. Cothran who wrote (1576 ) 7/21/2001 1:28:42 PM From: Dan Duchardt Read Replies (1) | Respond to of 5205 Andrew,It seems to me, all things being equal which they never are, to be an invariable rule that the 'powers that be' will exert every effort at their disposal (and they are many) to move a stock on expiration Friday just below that strike price which contains the largest number of open contracts. As I'm sure you are aware, you are not alone in your belief that something (if not the PTBs) tends to push stock prices near a strike price on expiration Friday. What strikes me about your comment is the focus on the strike price wtih the largest open interest. The theory of "Maximum Pain" rests on the the same basic assumption, except that it takes into consideration all open contracts at all strike prices and calculates the dollar value of those contracts as a function of closing price. You usually see it done and tabulated at the strike pricesiqauto.com but the actual minimum in the dollar value can be anywhere between two strike prices. When this is the case, the tabulated values surrounding the tabulated minimum are skewed, so you can get a pretty good estimate from the table where the true dollar minimum falls. If you look at Max Pain for QCOM for July there is a fairly symmetric minimum at 60 (actual minimum slightly higher), and the open interest maximum is also at 60 (total of calls plus puts), but there is a strong peak in call open interest at 70 and put open interest at 60. The question is, can one deduce the closing price better by looking at maximum open interest of just calls, just puts, combined puts plus calls, is it the MaxPain that more often prevails, or should one be doing a MaxPain like calculation without regard to $ value by simply counting contracts that will expire worthless? I'm inclined to agree with you that the strike prices themselves tend to attract closing prices, which suggests that one should be looking near the true MaxPain point ($$ always matters) for the strike price that will maximize the number of worthless options. I did that calculation for QCOM just now and came up with 156629 for strike 60 and 151144 for strike 65. The MaxPain dollar value was only about $5M lower at 60 than at 65. So I guess that technically 60 was a "better" closing price than 65, but not be enough to overcome the recent upward momentum of the stock. It would have been interesting to see what would have happened without the Thursday rally. I'm wondering what your experience (or anyone else's) suggests about stocks that are farther away from MaxPain on expiration Friday. Is this effect strong enough to move the price past the nearest strike level in the direction of MaxPain, or is a couple of dollars all you can expect? How much does the recent stock trend matter in estimating the potential size of the move? Dan