Olympus's woes have deepened after the Tokyo Stock Exchange placed its shares 'under supervision' and warned of possible delisting. The news follows the admission thatsenior executives colluded for decades to hide investment losses from the market, and a subsequent statement from Olympus that it would not be able to submit its quarterly earnings report on schedule. The TSE has warned that the company will be delisted if the report is not submitted by 14th December, prompting a further fall in its shares which have now lost almost two-thirds of their value over the past month.