Besides political power, many design companies have other prerequisites that must be completed before they are able to be selected and some are only available when certain DLC is enabled. Only one design company of each type can be selected at a time, but they can be removed for free or replaced at the price of the replacement. They provide research speed increases and stat bonuses to different technologies and equipment. This is a list of design companies in Hearts of Iron IV.ĭesign companies are ideas that can be bought for political power (usually 150). If you spot a mistake then you are welcome to fix it.