Twenty-four additional symbols will be added to begin trading on TSX Quantum on Monday, April 14.

They will join 13 other issues already trading on the TSX Quantum platform.

The Toronto Stock Exchange has been continuously monitoring and evaluating Quantum performance throughout the rollout, and says there are a number of interesting trends emerging from the trading patterns and performance numbers.

With the current list of issues, a median of six millisecond response time has been achieved consistently, as compared to the existing platform at a median of approximately 20 millisecond response time.

The TSX expects further decreases in latency upon implementation of the new Quantum gateway, which is scheduled for the second or third quarter of 2009.

The current trading engine has a capacity of 47 million orders per day with a full load of issues from TSX. Market capacity tests have proven TSX Quantum capacity to this threshold, with economically viable scalability to 1 billion orders per day.

“TSX Quantum is doing better than we expected it would do,” says Rik Parkhill, interim co-CEO, TSX Group Inc. “As we continue to migrate symbols to the new platform, we are seeing the early benefits of this changeover and as the introduction of the new technology continues, we expect additional improvements.”

For a list of the 24 symbols to begin trading on April 14, please see the attached news release.