Not merely the firm with the longest one-word name, PricewaterhouseCoopers (PwC) is also one of the world's largest accounting firms. PwC was formed when Price Waterhouse merged with Coopers & Lybrand in 1998, bypassing then-leader Andersen. With some 770 offices in more than 150 countries, the accountancy provides clients with services in three business lines: assurance (including financial and regulatory reporting), tax, and advisory. The umbrella entity for the PwC worldwide network of member firms is one of accounting's Big Four, along with Deloitte Touche Tohmatsu, Ernst & Young, and KPMG. PwC provides services in some capacity for most of the world's largest companies as well as smaller businesses.