Any domestic insurance company may retain or acquire the whole or any part of the capital stock of other insurance companies, provided no insurance company shall, by reason of such retention or acquisition of such capital stock, conduct its business with the public in a manner which substantially lessens competition or tends to create a monopoly, and provided, further, such retention or acquisition is consistent with the provisions of the law relating to the investment of the funds of domestic insurance companies.
40 P.S. § 459.1