Pressure Technologies PLC (AIM:PRES) slipped as it warned order delays in one division would mean it will miss its previous guidance.
AIM-listed Pressure Tech had previously pointed to an underlying loss of around £1 million, but order delays at Chesterfield Special Cylinders mean that is unlikely to be met, said the statement.
PMC, which is in the process of being sold, has continued to perform strongly, the statement added.
Due diligence on the sale has now been completed and the transaction is expected to complete shortly, the specialist engineer added.
Shares dropped 5% to 26.5p.