Already in the top ten, Summit Materials is on its way to the very top of the US construction materials market. In addition to supplying aggregates to customers, it uses its materials to produce ready-mixed concrete and asphalt paving mix, which it either sells to customers or uses in Summit's paving and related services businesses. The company's vertical integration gives Summit a competitive advantage by providing customers with efficiency gains, convenience, and reliability. Summit has grow rapidly through debt-funded acquisitions. At the end of 2014 it had $625 million aggregate principal amount of the senior notes outstanding. In 2015 the company went public in March, 2015, raising $400 million in its IPO.