| Worldwide Fund for Nature (WWF) | £34,780,648 |
| Organisation for Economic Co-operation and Development (OECD) | £23,198,670 |
| Royal Society for the Protection of Birds (RSPB) | £14,919,492 |
| London School of Economics (LSE) | £13,933,746 |
| Friends of the Earth | £13,006,209 |
| PricewaterhouseCoopers (PwC) | £12,392,039 |
| Institute for Fiscal Studies (IFS) | £5,624,925 |
| Confederation of British Industry (CBI) | £1,026,594 |
| National Union of Students (NUS) | £583,088 |
| Trades Union Congress (TUC) | £580,259 |
| Standard & Poors (S&P) | £566,362 |
| General, Municipal & Boilermakers Union (GMB) | £283,448 |
| UNITE the Union | £217,206 |
| Unison | £143,563 |
| International Monetary Fund (IMF) | £127,789 |
| National Farmers Union (NFU) | £101,723 |
| Commercial Workers Union (CWU) | £19,074 |
