In the US, when a director, officer or 10 percent owner buys or sells shares in the company they work for (insider buy/sell), a Form 4 or Form 5 must be submitted to SEC, and can be found on the EDGAR website.

What is the equivalent in the UK?


Director dealings have to be declared to the London Stock Exchange via the Regulatory News Service (RNS).

You can search that at https://www.londonstockexchange.com/news?tab=news-explorer ; to see just director dealings, click "Filter by" and select "Headline type" and then tick "Director/PDMR shareholding" and then "Apply filters". It may be useful to also select "Index" and/or "Sector" to cut down the amount of small-cap noise depending on how broadly you want to search. Note that "Time Period" defaults to "today" and you may want to expand that.

(A PDMR is a "person discharging managerial responsibilities"; typically a senior executive who has access to inside information about the business.)

This should link to all the director dealing RNS for FTSE100 companies in the last month: https://www.londonstockexchange.com/news?tab=news-explorer&headlines=184&indices=UKX&period=lastmonth

For significant "owner" trading, you would also want to select the "Holding(s) in Company" RNS. In the UK the threshold for reporting is 3%.

Some useful background on RNS and the various types of announcment at https://www.sharesmagazine.co.uk/article/understanding-the-different-types-of-stock-market-announcements

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