The Regulatory News Service (RNS) transmits regulatory and non-regulatory information published by companies and organisations allowing them to comply with local market transparency legislation.
It is owned by the London Stock Exchange

London Stock Exchange

The London Stock Exchange is a stock exchange located in the City of London within the United Kingdom. , the Exchange had a market capitalisation of US$3.7495 trillion, making it the fourth-largest stock exchange in the world by this measurement...

 and distributes over 90% of UK company news and results announcements and over 40% of the United States Securities and Exchange Commission (SEC)

United States Securities and Exchange Commission

The U.S. Securities and Exchange Commission is a federal agency which holds primary responsibility for enforcing the federal securities laws and regulating the securities industry, the nation's stock and options exchanges, and other electronic securities markets in the United States...

 filings on behalf of FTSE 100 companies, amounting to several hundred announcements a day.