Morton Thiokol

Morton Thiokol was the contractor that built the solid-fuel booster rocket used in the Challenger launch. After the shuttle exploded on January 28, 1986, the company’s stock suffered a far steeper decline than those of the other major contractors. Six months later, investigators traced the disaster to defective performance in the booster’s O-ring seals and held Morton Thiokol liable. The episode became a striking example of how a market could appear to aggregate information accurately before the basis for its judgment was publicly known—even when the mechanism behind that apparent knowledge remained obscure.

Role in the Challenger Launch

Morton Thiokol built the solid-fuel booster rocket for the launch of the Challenger space shuttle. The other major contractors had different responsibilities: Rockwell International built the shuttle and its main engines, Lockheed managed ground support, and Martin Marietta manufactured the external fuel tank. These distinct roles would matter immediately after the disaster, as investors tried to determine which company faced the greatest consequences.

At 11:38 a.m. on January 28, 1986, Challenger lifted off from Cape Canaveral. Seventy-four seconds later, ten miles above the ground, it exploded. The launch had been televised, and the first news story reached the Dow Jones News Wire eight minutes after the explosion. Investors began selling shares in all four contractors within minutes.

The Market’s Immediate Judgment

The initial losses were substantial but uneven. Twenty-one minutes after the explosion, Lockheed’s stock was down 5 percent, Martin Marietta’s 3 percent, and Rockwell’s 6 percent. Morton Thiokol’s stock drew the heaviest selling: so many investors wanted to sell and so few wanted to buy that trading was halted almost immediately.

When trading resumed almost an hour after the explosion, Morton Thiokol shares were down 6 percent. By the close of the day, the decline had nearly doubled, reaching almost 12 percent. The other three contractors’ shares began to recover, ending the day down only about 3 percent. In the book’s account, that divergence amounted to an unmistakable market judgment: investors believed Morton Thiokol was responsible and expected serious damage to its future earnings.

That judgment preceded any public accusation. On the day of the disaster, no public comments singled out Morton Thiokol. A report in The New York Times the following morning mentioned two circulating rumors, neither of which implicated the company, and said there were no clues to the cause. The contrast between the market’s sharp differentiation and the public uncertainty is central to the episode: investors appeared to identify the responsible contractor before the available public account did.

Cause and Accountability

Six months after the explosion, the Presidential Commission on the Challenger revealed the technical failure. The O-ring seals on the booster rockets made by Morton Thiokol were meant to prevent hot exhaust gases from escaping. In cold weather, the seals became less resilient, leaving gaps through which the gases could leak. In the Challenger disaster, escaping hot gases burned into the main fuel tank and caused the explosion.

The physicist Richard Feynman demonstrated the seals’ vulnerability at a congressional hearing by placing an O-ring in a glass of ice water. After the ring was removed, the drop in temperature had made it brittle. The investigation held Morton Thiokol liable for the accident and exonerated the other contractors. The later finding thus matched the market’s first-day differentiation among the companies.

The Unexplained Signal

Researchers Michael T. Maloney and J. Harold Mulherin investigated how the market could have identified Morton Thiokol so quickly. They examined insider trading records for evidence that company executives had sold their own shares, or that executives at competing firms had learned about the O-rings and profited by selling Morton Thiokol short while buying the other contractors’ stocks. They found no evidence of such trades. Savvy insiders, on the evidence they examined, did not account for the initial price drop; the decisive pressure came from investors who simply refused to buy the stock.

Maloney and Mulherin could not find a convincing explanation for that reluctance. In the end, they assumed insider information had caused the decline, but could not explain how it entered the market. The episode therefore supports a carefully qualified claim about collective judgment, not a settled account of its workings. The book notes possible cautions: the market’s identification of Morton Thiokol might have been luck; the company’s business might have appeared especially vulnerable to a downturn in the space program; or the trading halt might itself have warned investors away. Yet the early fall remains striking because the market was, in this account, functioning as a weighing mechanism rather than being driven by media speculation, momentum trading, or Wall Street promotion. Buyers and sellers were trying to assess what had happened, and their price signal aligned with the later investigation even though its source could not be established.