Only six of the top 100 companies on Aim have websites that fully comply with demands of the rule book introduced by the London Stock Exchange earlier this year.

Rule 26 requires that every one of more than 1,670 companies on the junior market must post required information on their websites by August 20, exactly four weeks away. But research from Investis, which provides corporate websites for 50 of the FTSE 100, has uncovered omissions on a majority of the websites for Aim's 100 biggest companies. One company does not have a website at all, while fewer than a third are more than halfway to meeting the full 28 criteria identified by Investis as necessary for compliance.