Read as much as you want on BostonGlobe.com, anywhere and anytime, for just 99¢.

Software problem shuts US options exchange

NEW YORK — Trading on the biggest exchange for financial options resumed Thursday following an outage caused by software problems.

The Chicago Board Options Exchange reopened at 12:50 p.m. after being closed from the start of the trading day. The shutdown forced traders to scramble for alternatives.

Continue reading below

The outage followed a brief scare in financial markets Tuesday afternoon when hackers sent a false Associated Press tweet reporting explosions at the White House. Stocks plunged for two minutes as computerized trading systems unloaded stocks. Regulators are increasingly looking into the safety of computerized trading systems.

Initially, there was speculation that Exchange computers had been hacked, but the exchange said hackers were not involved.

It was an internal ‘‘software issue’’ that had delayed the opening, said spokesperson Gail Osten.

The Exchange is the largest US options exchange.

It is the only place to trade two popular options — one a bet on the future price of the Standard and Poor’s 500 stock index, the other a kind of insurance against wild stock-price swings.

Loading comments...
Subscriber Log In

You have reached the limit of 5 free articles in a month

Stay informed with unlimited access to Boston’s trusted news source.

  • High-quality journalism from the region’s largest newsroom
  • Convenient access across all of your devices
  • Today’s Headlines daily newsletter
  • Subscriber-only access to exclusive offers, events, contests, eBooks, and more
  • Less than 25¢ a week
Marketing image of BostonGlobe.com
Marketing image of BostonGlobe.com