EXHIBIT 21 SUBSIDIARIES OF THE REGISTRANT The following is a list of Solutia's subsidiaries as of December 31, 2003, except for unnamed subsidiaries that, considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary. Percentage of Voting Power Owned by Solutia ------------- AMCIS AG.................................................... 100% CarboGen AG................................................. 100% CPFilms Inc................................................. 100% Monchem, Inc................................................ 100% Monchem International, Inc.................................. 100% Solchem Netherlands C.V..................................... 100% Solutia Deutschland GmbH.................................... 100% Solutia Europe S.A./N.V..................................... 100% Solutia Investments, LLC.................................... 100% Solutia Management Company, Inc............................. 90% Solutia Netherlands Holdings B.V............................ 100% Solutia Overseas, Inc....................................... 100% Solutia Services International SCA/Comm, VA................. 100% Solutia Systems, Inc........................................ 100% Solutia Taiwan, Inc......................................... 100% Solutia U.K. Holdings Limited............................... 100% Solutia U.K. Investments Limited............................ 100% Solutia U.K. Limited........................................ 100%