Later that day, the Australian Securities Exchange (ASX) suspended Lehman's Australian subsidiary as a market participant after clearing-houses terminated contracts with the firm. Lehman shares tumbled over 90% on September 15, 2008. The Dow Jones closed down just over 500 points on September 15, 2008, which was at the time the largest drop in a single day since the days following the attacks on September 11, 2001.