In 1990, Time Warner acquired a 19.5% stake in Six Flags, then by the end of 1991 acquired an additional 30.5% giving them 50% ownership of the corporation, with the remaining divided equally by silent partners, The Blackstone Group and Wertheim Schroder. Time Warner used the opportunity to advertise and promote their movies through the Six Flags parks. Time Warner purchased the remaining 50% in 1993, then in 1995 sold 51% of the corporation to Boston Ventures. Time Warner, however continued to manage the parks through 1997.