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  • 2001-10-03 (xsd:date)
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  • Were Stocks of Airlines Suspiciously Shorted Just Before 9/11? (en)
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  • On 11 September 2001, four planes were hijacked and used in the Attack on America: American Airlines Flight 11 leaving Boston bound for Los Angeles, American Airlines Flight 77 leaving Washington bound for Los Angeles, United Airlines Flight 175 leaving Boston bound for Los Angeles, and United Airlines Flight 93 leaving Newark bound for San Francisco. Each of these planes was deliberately crashed, killing all on board: two into the World Trade Center towers, one into the Pentagon, and one into a field in Pennsylvania. (Only the delay in takeoff of UA Flight 93 and the actions of the alerted passengers on board prevented it from becoming yet another instrument of destruction resulting in an even greater loss of life.) The operation had taken years to plan, and the perpetrators knew well in advance which airlines would be affected. In the month prior to the 11 September 2001 attacks on the World Trade Center and the Pentagon, unusual trading activity involving American and United Airlines stock was noted by market analysts who at the time had no idea what to make of it. Wildly unusual discrepancies in the put and call ratio — 25 to 100 times normal — were reportedly observed in stock options of the two airlines. In one case, Bloomberg's Trade Book electronic trading system identified option volume in UAL (parent of United Airlines) on 16 August 2001 that was 36 times higher than usual. (Options are wagers that the price of a 100-share block of a particular stock will rise or fall by a certain date. Puts are shorts, or bets the stock price will fall. Calls are bets the price will rise. Thus, one who has reason to believe a particular company is about to suffer a terrible reversal of fortune would purchase puts against that entity's stock.) But it was during the final few trading days (the market closes on weekends) that the most unusual variances in activity occurred. Bloomberg data showed that on 6 September 2001, the Thursday before that black Tuesday, put-option volume in UAL stock was nearly 100 times higher than normal: 2,000 options versus 27 on the previous day. On 6 and 7 September 2001, the Chicago Board Options Exchange handled 4,744 put options for United Airlines' stock, translating into 474,000 shares, compared with just 396 call options, or 39,600 shares. On a day that the put-to-call ratio would normally have been expected to be roughly 1:1 (no negative news stories about United had broken), it was instead 12:1. On 10 September 2001, another uneventful news day, American Airlines' option volume was 4,516 puts and 748 calls, a ratio of 6:1 on yet another day when by rights these options should have been trading even. No other airline stocks were affected; only United and American were shorted in this fashion. Accelerated investments speculating a downturn in the value of Morgan Stanley and Merrill Lynch (two New York investment firms severely damaged by the World Trade Center attack) were also observed. The National Commission on Terrorist Attacks Upon the United States (also known as the 9/11 Commission) investigated these rumors and found that although some unusual (and initially seemingly suspicious) trading activity did occur in the days prior to September 11, it was all coincidentally innocuous and not the result of insider trading by parties with foreknowledge of the 9/11 attacks: (en)
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