PacWest Bancorp is a bank holding company for Pacific Western Bank (the Bank). The Company is focused on relationship-based business banking to small, middle-market and venture-backed businesses. As of October 23, 2017, the Bank offered a range of loan and deposit products and services through 83 branches located throughout the state of California, one branch located in Durham, North Carolina, and several loan production offices located in cities across the country. The Company provides commercial banking services, and deposit and treasury management services to small and middle-market businesses. It offers products and services through its CapitalSource and Square 1 Bank divisions. In addition, the Company provides investment advisory and asset management services to select clients through Square 1 Asset Management, Inc., a subsidiary of the Bank.