Dairy and livestock services group National Milk Records said its revenue had fallen 14% in the third quarter after it suffered a cyber attack.
Revenue for the three months through September fell to £5.2m, down from £6.1m on-year.
The company said its operational systems had now been restored since the attack, which was announced on 25 September.
It was now working to relieve a modest backlog in testing and reporting.
The final cost of the cyber attack was still being calculated, though National Milk Records (NMR) said it expected the cost would be in line with its previous estimates.
'Despite an encouraging start to the quarter, the previously announced cyber-attack caused significant interruption to our business in the subsequent period,' chief executive Andy Warne said.
'Although uncertainty, in all markets, continues in the build-up to the general election, including what impact this may have on the Brexit process and the macro-economy, NMR believes that food supply and the UK dairy industry remains a resilient sector,' he added.
'Additionally, the increasing consumer demands for food safety and provenance will enable NMR to deploy ever more valuable services to meet these demands, which will believe will be a key driver for our services over the coming years.'