By Amber Murray Infrastructure investment company International Public Partnership has continued to boost its portfolio with four new investments and has argued that the market considers its share price “materially undervalued.” The FTSE-250 firm hiked its dividend growth target by three per cent to 8.37p per share in the six months ended 30 June, and declared a fully cash-covered interim dividend of 4.18p per share. INPP completed the acquisition of Moray East for £77m in February, which the company said would “increase its contribution to the UK’s transition to a net zero carbon economy”. Th…