(18)In order to ensure that trading carried out OTC does not jeopardise efficient price discovery or a transparent level playing field between means of trading, appropriate pre-trade transparency requirements should apply to investment firms dealing on own account in financial instruments OTC insofar as it is carried out in their capacity as systematic internalisers in relation to shares, depositary receipts, ETFs, certificates or other similar financial instruments for which there is a liquid market and bonds, structured finance products, emission allowances and derivatives which are traded on a trading venue and for which there is a liquid market.