| usa | 20 | 4 | | | | null |
| business | 19 | 2 | | | | null |
| technology | 14 | 2 | | | | null |
| finance | 14 | 2 | | | | null |
| california | 12 | 2 | | | | null |
| history | 11 | 7 | | | | null |
| investment | 9 | 3 | | | | null |
| silicon-valley | 9 | 0 | | | | null |
| biography | 9 | 1 | | | | null |
| war | 8 | 0 | | | | null |
| law | 8 | 0 | | | | null |
| politics | 8 | 3 | | | | null |
| sci-fi | 7 | 5 | | | | null |
| russia | 7 | 2 | | | | null |
| economics | 7 | 1 | | | | null |
| advocacy | 6 | 1 | | | | null |
| 19c-ad | 6 | 0 | | | | null |
| internet | 6 | 1 | | | | null |
| england | 6 | 4 | | | | null |
| leadership | 6 | 0 | | | | null |