Limitless Earth PLC shed 20% as the population change-focused investment company took substantial write-downs on two of its investments.
Saxa Gres, which has developed an innovative tile production process, has been hit by the surge in energy costs and was written down by 90%.
Exogenesis, a nanomaterial coatings specialist, saw its carrying value reduced by 50% after what the group said was a prudent assessment of its prospects.
Net assets at the 31 January 2023 year-end were £1.09mln (£1.57mln).
Shares dropped 1p to 4p.