takeover

vallankaappaus

valtaus puhekieltä The purchase of one company by another; a merger without the formation of a new company, especially where some stakeholders in the purchased company oppose the purchase.
(quote-magazine)
puhekieltä The acquisition of a public company whose shares are listed on a stock exchange, in contrast to the acquisition of a private company.
A time or event in which control or authority, especially over a facility is passed from one party to the next.
1991, Information Services on Latin America (Oakland, Calif.), ISLA: Volume 43, Issues 1-3, p. 195:

Revollo was absent when Bolivian police and the navy captain arrived at dawn, and the base takeover came off without problems, according to a U.S. narcotics official.