EU Membership: Opinium
| End Date | Company | Client | IN | OUT | DK | Lead |
| 20 Oct 2017 | Opinium Online | Observer | 46 | 45 | 9 | +1 |
| 22 Sep 2017 | Opinium Online | 45 | 44 | 12 | +1 | |
| 15 Sep 2017 | Opinium Online | 45 | 45 | 10 | Tie | |
| 18 Aug 2017 | Opinium Online | 47 | 44 | 9 | +3 | |
| 30 Jun 2016 | Opinium Online | 48 | 42 | 9 | +6 | |
| 22 Jun 2016 | Opinium Online | 44 | 45 | 9 | +1 | |
| 17 Jun 2016 | Opinium Online | Observer | 44 | 44 | 10 | Tie |
| 10 Jun 2016 | Opinium Online | Observer | 44 | 42 | 13 | +2 |
| 03 Jun 2016 | Opinium Online | Observer | 43 | 41 | 14 | +2 |
| 19 May 2016 | Opinium Online | Observer | 44 | 40 | 14 | +4 |
| 29 Apr 2016 | Opinium Online | Observer | 42 | 41 | 14 | +1 |
| 01 Apr 2016 | Opinium Online | Observer | 39 | 43 | 18 | +4 |
| 24 Jan 2016 | Opinium Online | Observer | 40 | 41 | 19 | +1 |
| 09 Apr 2015 | Opinium | Observer | 45 | 41 | 14 | +4 |
| 20 Feb 2015 | Opinium | Observer | 41 | 44 | 14 | +3 |
| 19 Jun 2014 | Opinium | Observer | 37 | 48 | 14 | +11 |