What is the RNS Regulatory News Service?
RNS is the London Stock Exchange's Regulatory News Service, the channel through which listed companies must disclose price-sensitive information to the market.
The Regulatory News Service (RNS) is the official announcement platform operated by the London Stock Exchange Group. UK-listed companies on both the Main Market and AIM are required to use RNS (or an FCA-approved equivalent) to release Regulatory Information — any material news that could affect their share price — to the public in a timely, standardised, and simultaneous manner.
The obligation to release price-sensitive information via RNS stems from the Market Abuse Regulation (MAR) and the FCA's Disclosure and Transparency Rules (DTR). The core principle is that all investors must have equal, simultaneous access to material information. Distributing it through a single regulated channel prevents selective briefing of analysts, institutional investors, or journalists ahead of the general public.
Typical RNS announcements include: annual and half-year results, trading updates, dividend declarations, director share dealings, major contract wins or losses, board changes, regulatory approvals, and merger or acquisition activity. Results are often accompanied by detailed financial statements filed as PDF attachments.
Investors and traders monitor RNS feeds closely, particularly at 7:00 am London time on weekday mornings when the majority of results and major announcements are released before the market opens at 8:00 am. A company's share price can move sharply in pre-market trading or at the open based on the content of a morning RNS. News desks, data terminals (Bloomberg, Refinitiv), and specialist sites aggregate RNS feeds in real time.
For UK retail investors, free access to RNS announcements is available directly through the LSE website and through the FCA's National Storage Mechanism (NSM), ensuring the regulatory requirement for equal information access is met in practice.