There is a wide range of different enzyme catalyzed reactions that are catalyzed using FMN as a cofactor. A few of these are shown below.
1.) Trimethylamine Dehydrogenase
2.) NADPH-cytochrome P450 Reductase
3.) Glycolate Oxidase
4.) Dihydroorotate Dehydrogenase A
5.) NADPH-flavin Oxidoreductase