A deal would create a giant in global food, joining the maker of Kraft cheese and Heinz ketchup to its European counterpart, whose products include Q-tips, Hellmann's mayonnaise and Ben & Jerry's ice cream.
Unilever said the offer of an 18 per cent premium to yesterday's stock price "fundamentally undervalues" the company and it "does not see the basis for any further discussions."
But Kraft, acknowledging its rejection, said "we look forward to working to reach agreement on the terms of a transaction," although there was no guarantee of a deal.
But analysts said the potentially massive merger could raise red flags for antitrust regulators over the effect on consumers, and for politicians given the potentially large job cuts.
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"If the deal does see the daylight, this simply means more job loss for UK and more pain for consumers as competition will erode," said Naeem Aslam, analyst at Think Markets, a market analytics and trading firm.
Kraft Heinz yesterday reported a year-over-year drop in fourth quarter sales, due in part to 13.3 per cent decline in Europe, a region chief executive Bernardo Hess called "weak" on an analyst conference call.
Kraft Heinz is the fifth-biggest food and beverage company in the world and the third-biggest in North America. It was formed by the 2015 merger struck between Heinz's controlling shareholders, US billionaire Warren Buffet's Berkshire Hathaway, and 3G Capital of Brazil.
Aslam said Kraft's move comes at a vulnerable moment for Unilever and for British firms more generally.
"Perhaps, predators see a lot of blood and opportunity and falling sterling has produced enough blood on the street for firms around the world to look and cash on opportunities," Aslam said.
"The UK government may try to block the deal and Mr. Trump is all about making in America and inward America. So there could potentially be some sort of battle surfacing on the government level as well which can make the newly established relation between the UK and the US a bit sour.
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