Notable quotes on exchanges and trading

NEW YORK (Reuters) - The following are some notable quotes from the Reuters Exchanges and Trading Summit, which is bringing together industry heavyweights to take the pulse of the financial sector.

GARY KATZ, CHIEF EXECUTIVE, INTERNATIONAL SECURITIES EXCHANGE:

On the potential for more options marts:

"We'll know that we've reached the right number of options exchanges when the last one in doesn't make money -- and that hasn't happened yet."

MAGNUS BOCKER, PRESIDENT, NASDAQ-OMX:

On the nature of competition:

"When you have a market that continues to grow there will always be niche players, there will always be strong players that will find room. You can't start the morning thinking, they'll be dead in a few months so don't bother. There will always be strong teams fighting for the business."

WILLIAM BRODSKY, CHIEF EXECUTIVE, CHICAGO BOARD OPTIONS EXCHANGE:

On Treasury's proposed change to preferential tax treatment for the derivatives industry: