Activist Mantle Ridge Has $1.8 Billion Stake in Dollar Tree

Activist investor Mantle Ridge LP has at least a $1.8 billion stake in Dollar Tree Inc. and plans to push the discount retailer to take action to boost its share price, according to people familiar with the matter.

Mantle Ridge believes Dollar Tree could ignite its underperforming shares by making improvements to its Family Dollar chain and its pricing strategy, the people said.