Source: Wikipedia, Tecmo Koei, available under the CC-BY-SA License.
Tecmo Koei Holdings Co., Ltd. (コーエーテクモホールディングス, Kōē Tekumo Horudingusu),is a Japanese holding company formed in 2009 when Koei merged with Tecmo.
Koei Europe changed its name to Tecmo Koei Europe, Ltd. and now releases video games under the new moniker. In January 2010, Tecmo, Inc. and Koei Corporation merged into Tecmo Koei America Corporation. Tecmo has been declared disbanded in Japan, effective as of April 1, 2010. Koei Canada, Inc. has since changed its name to Tecmo Koei Canada, Inc.
Tecmo Koei created a division in Vietnam called Koei Tecmo Vietnam, including creating divisions in Singapore, Korea, and Taiwan.