UK listed companies publish regulatory information through a Regulatory News Service, a channel that distributes announcements to the market simultaneously. It is the mechanism that makes disclosure genuinely public rather than selectively shared, and it is where director dealings appear.
A director's purchase is typically announced under a heading such as "Director/PDMR Shareholding". The announcement names the person and their role, the number of shares, the price paid, the date of the transaction, and the resulting holding. That structure is why the data can be parsed reliably at all.
A TR-1 is a different document that people often conflate with this one. TR-1 notifications concern major shareholdings — the disclosures triggered when any investor's stake crosses defined percentage thresholds. A TR-1 can be filed by an institution with no management role whatsoever, and a director's routine purchase usually doesn't trigger one.
So the two answer different questions. A Director/PDMR announcement tells you an insider changed their personal position; a TR-1 tells you someone's stake crossed a size threshold. Only the first is evidence about what management thinks.
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Information only, not investment advice.