Between September 6 and 7, the Chicago Board Options Exchange saw purchases of 4,744 put options on United Airlines, but only 396 call options… Assuming that 4,000 of the options were bought by people with advance knowledge of the imminent attacks, these “insiders” would have profited by almost $5 million.

On September 10, 4,516 put options on American Airlines were bought on the Chicago exchange, compared to only 748 calls. Again, there was no news at that point to justify this imbalance;… Again, assuming that 4,000 of these options trades represent “insiders,” they would represent a gain of about $4 million.

No similar trading in other airlines occurred on the Chicago exchange in the days immediately preceding Black Tuesday.

Morgan Stanley Dean Witter & Co., which occupied 22 floors of the World Trade Center, saw 2,157 of its October $45 put options bought in the three trading days before Black Tuesday; this compares to an average of 27 contracts per day before September 6.

Assuming that 2,000 of these options contracts were bought based upon knowledge of the approaching attacks, their purchasers could have profited by at least $1.2 million.

Merrill Lynch & Co., which occupied 22 floors of the World Trade Center, saw 12,215 October $45 put options bought in the four trading days before the attacks; the previous average volume in those shares had been 252 contracts per day [a 1200% increase!].

When trading resumed, Merrill’s shares fell from $46.88 to $41.50; assuming that 11,000 option contracts were bought by “insiders,” their profit would have been about $5.5 million.