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In the realm of US stock markets, several entities play critical roles in providing and managing data. Notably, the stock quote information predominantly comes from BATS, which ensures traders receive accurate and timely updates. The main US market indices update in real time, except for the S&P 500, which has a slight delay with updates every two minutes. All the provided times are in Eastern Time (ET).

FactSet Research Systems Inc. stands as a pivotal entity in the supply of crucial market data. Their extensive database supports various financial operations. Similarly, the Chicago Mercantile Exchange Inc. (CME) owns specific market data, leveraging its extensive network of licensors. Both FactSet and the CME uphold strict rights to their data, ensuring their exclusivity and proper use.

The Dow Jones indices carry a unique distinction in the industry. They are exclusively calculated, distributed, and marketed by DJI Opco, under the umbrella of S&P Dow Jones Indices LLC. This collaboration extends to S&P Opco, LLC and CNN for usage purposes. The trademarks "Standard & Poor's" and "S&P" belong to Standard & Poor's Financial Services LLC, while "Dow Jones" is a registered trademark of Dow Jones Trademark Holdings LLC. All associated content rights are preserved by S&P Dow Jones Indices LLC and its affiliates.

Additionally, fair value assessments are provided by IndexArb.com, contributing to comprehensive market analysis. Information on market holidays and trading hours is furnished by Copp Clark Limited, rounding out the essential data ecosystem for market participants.

These entities collectively maintain the integrity and functionality of market data, underpinning the operations of financial markets with precision and reliability.