| Constituencies | Regional List | Total | ||
|---|---|---|---|---|
| Welsh Labour Party | 40 | 5 | 45 | |
| Conservative Party of Wales | 11 | 16 | 27 | |
| Plaid Cymru | 7 | 13 | 20 | |
| Welsh Liberal Party | 1 | 0 | 1 | |
| Green Party of Wales | 0 | 1 | 1 |
| A Seats (2016) |
B Seats (2021) |
Total | ||
|---|---|---|---|---|
| Welsh Labour Party | 8 | 10 | 18 | |
| Conservative Party of Wales | 5 | 7 | 12 | |
| Plaid Cymru | 5 | 6 | 12 | |
| Reform Wales | 4 | 0 | 4 | |
| Welsh Liberal Party | 2 | 1 | 3 | |
| Green Party of Wales | 0 | 1 | 1 | |
| Abolish the Welsh Assembly | 1 | 0 | 1 |