The Financial Services Authority (FSA) in the UK has brought forward plans to make investors disclose positions based on derivatives in a bid to prevent the use of CFDs.
The new rules are the same as the requirements for anyone holding plain stock and represent a push for greater market transparency.
Shares and such financial instruments will have to be aggregated and disclosed once over the 3% threshold.
This will ensure that they are not used covertly to influence corporate governance and/or build up stakes in companies.
An exemption has also been put in place for CFD writers acting in a client-serving capacity, to prevent unnecessary disclosures to the market.