(18)The public should be informed of changes to major holdings in issuers whose shares are traded on a regulated market situated or operating within the Community. This information should enable investors to acquire or dispose of shares in full knowledge of changes in the voting structure; it should also enhance effective control of share issuers and overall market transparency of important capital movements. Information about shares or financial instruments as determined by Article 13, lodged as collateral, should be provided in certain circumstances.