Wells Fargo & Company is an American multinational financial services company headquartered in San Francisco, California, with central offices throughout the United States. It is the world's second-largest bank by market capitalization and the fourth largest bank in the US by total assets. Wells Fargo is ranked #26 on the 2018 Fortune 500 rankings of the largest US corporations by total revenue. In July 2015, Wells Fargo became the world's largest bank by market capitalization, edging past ICBC, before slipping behind JPMorgan Chase in September 2016, in the wake of a scandal involving the creation of over 2 million fake bank accounts by Wells Fargo employees. Wells Fargo surpassed Citigroup to become the third-largest US bank by assets at the end of 2015 but fell behind Bank of America to third in bank deposits in 2017.The firm's primary operating subsidiary is national bank Wells Fargo Bank, N.A., which designates its main office as Sioux Falls, South Dakota. Wells Fargo in its present form is a result of a merger between San Francisco–based Wells Fargo & Company and Minneapolis-based Norwest Corporation in 1998 and the subsequent 2008 acquisition of Charlotte-based Wachovia. Following the mergers, the company transferred its headquarters to Wells Fargo's headquarters in San Francisco and merged its operating subsidiary with Wells Fargo's operating subsidiary in Sioux Falls. Along with JPMorgan Chase, Bank of America, and Citigroup, Wells Fargo is one of the "Big Four Banks" of the United States. As of June 2018, it had 8,050 branches and 13,000 ATMs. In 2018 the company had operations in 35 countries with over 70 million customers globally.In February 2014, Wells Fargo was named the world's most valuable bank brand for the second consecutive year in The Banker and Brand Finance study of the top 500 banking brands. In 2016, Wells Fargo ranked 7th on the Forbes Magazine Global 2000 list of largest public companies in the world and ranked 27th on the Fortune 500 list of the largest companies in the US. In 2015, the company was ranked the 22nd most admired company in the world, and the 7th most respected company in the world. As of December 2018, the company had a Standard & Poors credit rating of A−. However, for a brief period in 2007, the company was the only AAA‑rated bank, reflecting the highest credit rating from two firms.On February 2, 2018, the US Federal Reserve Bank barred Wells Fargo from growing its nearly US$2 trillion-asset base any further, based upon years of misconduct, until Wells Fargo fixes its internal problems to the satisfaction of the Federal Reserve. In April 2018, The Wall Street Journal reported that the US Department of Labor had launched a probe into whether Wells Fargo was pushing its customers into more expensive retirement plans as well as into retirement funds managed by Wells Fargo itself. Subsequently in May 2018, The Wall Street Journal reported that Wells Fargo's business banking group had improperly altered documents about business clients in 2017 and early 2018. In June 2018, Wells Fargo began retreating from retail banking in the Midwestern United States by announcing the sale of all its physical bank branch locations in Indiana, Michigan, and Ohio to Flagstar Bank.