Convenience food group Greencore said that group revenue fell by 34.1% to £240.6m in its fiscal third quarter.
This was mainly due to the impact of Covid-19 on food to go categories during the 13 weeks from March 27 to June 26, it said.
The Ireland-based, London-listed group said that given the ongoing level of uncertainty around the possible duration and impact of Covid-19, its financial guidance for the full year remains suspended.
Greencore - the biggest pre-packed sandwich maker in the UK - said that Covid-19 has had a "dramatic and volatile impact" on UK food consumption patterns in the period.
But it added that it has partnered closely with its customers to develop and re-activate product ranges as they reopen formats and channels.
In this context production at its Bow, Atherstone and Heathrow facilities has restarted, while Greencore has also extended production at its Northampton site as demand trends improve.
Greencore also said today that it has entered into a conditional agreement to sell its interests in its molasses trading businesses to United Molasses Marketing (Ireland) Limited and United Molasses Marketing Limited for a cash consideration of abouty £15.6m.
The core activities of these businesses are importing and distributing animal feed across the island of Ireland.
Patrick Coveney, Greencore's chief executive, said the decisive actions the company has taken are enabling it to keep its staff safe, helping to feed the UK, and protecting the business.
"Our group has traded resiliently, with our deep customer relationships strengthened further, and we are encouraged to see a sustained improvement in demand and category mix," Patrick Coveney said.
"We remain confident in the relevance and attractiveness of the food to go channels and categories that we serve. In addition, we are well positioned for new business opportunities and a return to growth as the pandemic subsides," he added.
Shares in the company rose by 7.5% in London trade today.