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Statistics on EC numbers held in the database.
| Class 1 (Oxidoreductases) | Class 2 (Transferases) | Class 3 (Hydrolases) | Class 4 (Lyases) | Class 5 (Isomerases) | Class 6 (Ligases) | All classes | |
| Current | 1,108 | 1,162 | 1,111 | 356 | 160 | 139 | 4,036 |
| Transferred | 146 | 48 | 276 | 63 | 3 | 1 | 537 |
| Deleted | 60 | 57 | 98 | 21 | 7 | 4 | 248 |
| Total | 1,253 | 1,208 | 1,382 | 416 | 163 | 140 | 4,821 |
