Stifel (NYSE: SF) today announced that its Stifel, Nicolaus & Company, Incorporated broker-dealer subsidiary has moved its office from Sioux City, Iowa, to Dakota Dunes, South Dakota.The Sioux City office’s origin dated back to the early 1950s when TC Henderson established an investment office in the Badgerow Building in downtown Sioux City. Stifel purchased the office in 2009 and has now…