The New York Stock Exchange says that it will start using its own index as the guide for whether trading collars are triggered.

Beginning October 3, the restrictions on index-arbitrage trading in NYSE listed component stocks of the S&P 500 Index will be based on the NYSE composite index.

The exchange reports that the U.S. Securities and Exchange Commission approved amendments to the rules, which revise the basis for calculating the trading collars to the NYSE composite, replacing the Dow Jones Industrial Average.

The amended rules will now base the trading collars on a 2% movement in the average closing value of the NYSE composite.

“The NYSE Composite Index is the best barometer for long-term trends and intra-day market performance as it reflects the breadth and quality of stocks listed on the NYSE,” says NYSE senior vp of competitive position, Robert McSweeney. “With the index recalibration and the introduction of an NYSE Composite-based exchange-traded fund, the NYA is the natural benchmark for any policies intended to dampen volatility and increase investor confidence in our market.”

The NYSE Composite Index is designed to measure the performance of all common stocks and ADRs listed on the exchange. It also closely reflects the broader market, representing 77% of the total market capitalization of all publicly traded companies in the U.S. and 64% of the world’s total market capitalization.