Mars, the privately held maker of M&Ms, Snickers and Skittles, paid $23 billion for Wrigley, a household name in its hometown of Chicago after it started in 1891.
At the end of Monday, Wrigley's stock will cease trading publicly. Wrigley shareholders will receive $80 for each share after they approved the deal last month.
The merger will combine companies that have worldwide footprints and are powerhouses in separate parts of the confectionery sector, Wrigley in gum and Mars in chocolate candy.
The deal, announced in April, includes financing from famed investor Warren Buffett.
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