The UK’s FTSE 100 index of the country’s largest publicly listed companies on Monday welcomed three new names to its ranks: Packaging business DS Smith, online food delivery service Just Eat and technology group Halma. Each quarter, the blue chip index is rebalanced to account for changing market valuations of its constituents. The three new joiners squeeze out medical products company ConvaTec, theme park operator Merlin Entertainments and support services group Babcock. All three will enter the FTSE 250 index.