Catalytic cracking catalyst compositions having a high degree of activity and selectivity for the production of high octane gasoline fractions which comprise stabilized crystalline molecular sieve SAPO-37 dispersed in an inorganic oxide matrix. The crystalline structure and activity of the SAPO-37 molecular sieve component is preserved by including a stabilizing amount of the organic template compound used in the manufacture of the molecular sieve within the pore structure thereof until such time as the catalyst is thermally activated during use.