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Taxes, fees not included for deals content. Skip to main navigation. TripAdvisor log files, average monthly unique visitors, Q3 Minimum 15 minutes delayed. Second Quarter Financial Results Show all. Nov 8, at 8: News Oct 2, 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 , the Thursday before that black Tuesday, put-option volume in UAL stock was nearly times higher than normal: On a day that the put-to-call ratio would normally have been expected to be roughly 1: 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.

Some unusual trading did in fact occur, but each such trade proved to have an innocuous explanation. For example, the volume of put options — instruments that pay off only when a stock drops in price — surged in the parent companies of United Airlines on September 6 and American Airlines on September 10 — highly suspicious trading on its face.

Similarly, much of the seemingly suspicious trading in American on September 10 was traced to a specific U. The SEC and FBI, aided by other agencies and the securities industry, devoted enormous resources to investigating this issue, including securing the cooperation of many foreign governments. These investigators have found that the apparently suspicious consistently proved innocuous.

Toedtman, James and Charles Zehren.