CIS barometer
CIS (Ateneo del Dato) poll of May 18, 2026
In the CIS (Ateneo del Dato) poll (fieldwork May 4, 2026 to May 18, 2026, 4,016 interviews), the list with the most votes is PP, on 30.7 % of the vote and 129 seats. Next comes PSOE, on 30.3 % and 121 seats. Compared with this pollster's previous poll (April 10, 2026), PP moved by −0.2 points. In our average that day, PP stood at 31.9 %.
- Pollster
- CIS (Ateneo del Dato)
- Commissioned by
- n/a
- Fieldwork
- 4-18 May
- Sample
- 4,016
CIS barometers and their re-estimates are not part of our average: they are shown separately.
Estimate by party
| Party | Vote | Seats | Vs. previous | Vs. average |
|---|---|---|---|---|
| PP | 30.7 % | 129(−1) | −0.2 | −1.2 |
| PSOE | 30.3 % | 121(+6) | +1.4 | +2.3 |
| Vox | 17.4 % | 60(−3) | −0.2 | −0.4 |
| Sumar | 6.4 % | 11(+1) | +0.7 | +0.2 |
| Podemos | 2.1 % | 0 | 0.0 | −1.3 |
| SALF | 1.8 % | 0 | 0.0 | −0.3 |
Vs. previous: change in points from the same pollster's poll of April 10, 2026. Vs. average: difference from our weighted average of May 18, 2026.
Figures from the poll table on Wikipedia (CC BY-SA 4.0). Original publication: Ateneo del Dato.
How to cite: Su Momento, “CIS (Ateneo del Dato) poll of May 18, 2026”, May 18, 2026, https://sumomento.com/en/encuestas/cis-ateneo-del-dato-2026-05-18