Shares in Premier Foods were down 14.75 pence, or 12.2%, at 105.75p in afternoon trade.
Premier Foods has announced plans to close a flour mill in Glasgow, with the loss of 15 jobs.
Premier Foods, which makes Hovis bread, is to abandon its pledge to use only British wheat in its loaves.
Premier Foods, the maker of Hovis, is cutting 900 jobs at its bread division and is closing two bakeries.
For investors in Premier Foods, the road to riches is unlikely to be as smooth as its instant mash.
ECONOMIST: A debt-ridden firm tries to breathe new life into old brands
Premier Foods is selling its vinegar and sour pickles business as it continues its strategy of concentrating on "power brands".
Unbar Rothon also had its premises at Clacton inspected and Premier Foods have a site at Oldham which was visited.
When Premier Foods firm announced the closure, the Bakers, Food and Allied Workers Union said Premier should have fought for the contract.
The company was trying to help employees secure alternative employment either within the Premier Foods Group, or "by providing outplacement support", she said.
The company has said it would try to help employees secure alternative employment either within the Premier Foods Group, or "by providing outplacement support".
Premier Foods said at the time that it was necessary to pass increases on to retailers, but at one point, Tesco refused to stock some Hovis products.
In November, Premier Foods announced the closure of the bakery as well as a site in Greenford, west London with the loss of a further 400 jobs.
Her son, Bernard, 31, an executive at privately held Premier Foods (the Roodes own one-fourth of the company), thought the family should sell off some of Kapama's assets.
Chairman of the South African milling company General Food Industries (now Johannesburg-based Premier Foods), Johann for two decades had owned and managed Kapama, a 32, 000-acre game reserve in South Africa.
Residents and politicians in Birmingham have reacted with shock to the news that Premier Foods, the maker of Hovis bread, is to close a bakery with the loss of 500 jobs.
"This is just another stage in the disaster story that has been Premier Foods over recent years, which has consistently struggled ever since its decision to buy Hovis in 2006, " said Jennie Formby, Unite national officer for food and drink.
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