Eindhoven-based food group Vion said supplying Asda represented about 50% of business at its Gaerwen plant.
Dutch food group VION announced in November that it was selling its UK operations.
Smart Balance on Aug. 3, acquired Glutino Food Group, the leader in the gluten-free food chain.
Unite is seeking talks with the owners of the plant, the ABP Food Group.
BBC: Horsemeat row: Trade union's fears over Silvercrest jobs
The 2 Sisters Food Group said the purchase will help the company meet growing demand.
Earlier this year, it acquired a 60% stake in food maker Yinlu Food Group.
Today his fast-food group Jollibee, which he still runs, has almost 1, 500 locations operating under 6 brands.
The purchase by Kirkconnel-based Browns Food Group does not include production facilities but sees 50 jobs retained.
The Birmingham-based 2 Sisters Food Group said the purchase of Vion would help the company meet growing demand.
The 2 Sisters Food Group, owned by Boparan Holdings Limited (BHL), also owns Fox's biscuits and Goodfella's pizzas.
Birmingham-based 2 Sisters Food Group said its purchase of VION would give it more capacity to meet growing demand.
The second largest pizza chain in China is The Pizza Company, a brand owned by Minor Food Group.
Both Dalepak - based near Northallerton in North Yorkshire - and Silvercrest are part of the ABP Food Group.
The ABP Food Group said it had halted work at its Silvercrest Foods plant, in Co Monaghan, until further notice.
Earlier this month the Eindhoven-based food group Vion confirmed that supplying Asda represents about 50% of business at the Gaerwen plant.
In a statement, Greencore said the sauce contained meat supplied by the ABP Food Group's Nenagh plant in County Tipperary, Ireland.
And Number One Food Group, which was to feature Greg Norman pasta sauce and other foods, never got off the ground.
Up to 800 staff at 2 Sisters Food Group are staging what they say is the first of three 24-hour strikes.
Last week Browns Food Group, based in Dumfries and Galloway, said it had agreed a deal to buy the Hall's brand and recipes.
The UK Food Group suggests that the production of meat causes an annual "calorie loss" around the world equivalent to the need of 3.5 billion people.
BBC: MPs urge UK to eat less meat to help global food supplies
The ABP Food Group, one of Europe's biggest suppliers and processors, stopped work at its Silvercrest Foods plant in Ireland, after the contamination emerged.
Freshlink is a subsidiary of ABP Food Group, the company that owns Silvercrest Foods where the first products with equine DNA were discovered in January.
Boparan Holdings also owns the FishWorks restaurant chain, as well as chicken processor Two Sisters Food Group, which is one of Tesco's largest poultry suppliers.
Earlier on Wednesday, Tesco announced it was dropping Silvercrest, part of the ABP Food Group, as a supplier in the wake of the horsemeat scandal.
Browns Food Group is one of the UK's leading food manufacturers.
In response, Paul Finnerty, chief executive of ABP Food Group, said the firm had "learnt important lessons" and was "determined to ensure this never happens again".
He was the first to jump to the defence of Danone, a French food group, when rumours started of a takeover by the American giant, PepsiCo.
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However many feel uneasy about a diet that, in the first stage at least, almost completely cuts out a food group (intake is limited to less than 20g a day).
Performance Food Group is a food distributor to restaurants.
It was bought by the Birmingham-based 2 Sisters Food Group, along with sites at Sandycroft in Flintshire, where 1, 300 people are employed, and at Merthyr Tydfil where another 1, 300 jobs were saved.
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