Opinion Poll by Sigma Dos for El Mundo, 20–26 August 2026
Voting Intentions | Seats | Coalitions | Technical Information
Voting Intentions
Confidence Intervals
| Party | Last Result | Poll Result | 80% Confidence Interval | 90% Confidence Interval | 95% Confidence Interval | 99% Confidence Interval |
|---|---|---|---|---|---|---|
| Partido Popular (EPP) | 0.0% | 33.1% | 31.8–34.4% | 31.4–34.8% | 31.1–35.1% | 30.5–35.7% |
| Partido Socialista Obrero Español (S&D) | 0.0% | 25.4% | 24.2–26.6% | 23.9–27.0% | 23.6–27.3% | 23.1–27.9% |
| Vox (PfE) | 0.0% | 17.9% | 16.9–19.0% | 16.6–19.3% | 16.3–19.6% | 15.9–20.1% |
| Movimiento Sumar–Izquierda Unida (GUE/NGL) | 0.0% | 3.8% | 3.3–4.4% | 3.2–4.5% | 3.0–4.7% | 2.8–5.0% |
| Catalunya en Comú–Més–Compromís–Más País–Chunta (Greens/EFA) | 0.0% | 2.9% | 2.4–3.4% | 2.3–3.5% | 2.2–3.6% | 2.0–3.9% |
| Podemos (GUE/NGL) | 0.0% | 2.8% | 2.4–3.3% | 2.3–3.5% | 2.2–3.6% | 2.0–3.9% |
| Esquerra Republicana de Catalunya–Catalunya Sí (Greens/EFA) | 0.0% | 2.4% | 2.0–2.9% | 1.9–3.0% | 1.8–3.1% | 1.7–3.4% |
| Euskal Herria Bildu (GUE/NGL) | 0.0% | 1.2% | 0.9–1.6% | 0.9–1.7% | 0.8–1.8% | 0.7–2.0% |
| Junts per Catalunya (NI) | 0.0% | 1.1% | 0.9–1.5% | 0.8–1.6% | 0.7–1.6% | 0.6–1.8% |
| Euzko Alderdi Jeltzalea/Partido Nacionalista Vasco (RE) | 0.0% | 1.0% | 0.8–1.4% | 0.7–1.4% | 0.7–1.5% | 0.6–1.7% |
| Bloque Nacionalista Galego–Nós Candidatura Galega (Greens/EFA) | 0.0% | 0.8% | 0.6–1.1% | 0.5–1.2% | 0.5–1.2% | 0.4–1.4% |
| Coalición Canaria–Partido Nacionalista Canario (RE) | 0.0% | 0.5% | 0.4–0.8% | 0.3–0.8% | 0.3–0.9% | 0.2–1.1% |
| Unión del Pueblo Navarro (*) | 0.0% | 0.2% | 0.1–0.4% | 0.1–0.4% | 0.1–0.5% | 0.0–0.6% |
Note: The poll result column reflects the actual value used in the calculations. Published results may vary slightly, and in addition be rounded to fewer digits.
Seats
Confidence Intervals
| Party | Last Result | Median | 80% Confidence Interval | 90% Confidence Interval | 95% Confidence Interval | 99% Confidence Interval |
|---|---|---|---|---|---|---|
| Partido Popular (EPP) | 0 | 23 | 23–24 | 22–25 | 22–25 | 22–26 |
| Partido Socialista Obrero Español (S&D) | 0 | 17 | 17–18 | 17–19 | 17–19 | 16–20 |
| Vox (PfE) | 0 | 13 | 11–13 | 11–13 | 11–13 | 11–14 |
| Movimiento Sumar–Izquierda Unida (GUE/NGL) | 0 | 2 | 2–3 | 2–3 | 2–3 | 2–3 |
| Catalunya en Comú–Més–Compromís–Más País–Chunta (Greens/EFA) | 0 | 2 | 2 | 1–2 | 1–2 | 1–3 |
| Podemos (GUE/NGL) | 0 | 1 | 1–2 | 1–2 | 1–2 | 1–2 |
| Esquerra Republicana de Catalunya–Catalunya Sí (Greens/EFA) | 0 | 1 | 1–2 | 1–2 | 1–2 | 1–2 |
| Euskal Herria Bildu (GUE/NGL) | 0 | 0 | 0–1 | 0–1 | 0–1 | 0–1 |
| Junts per Catalunya (NI) | 0 | 0 | 0–1 | 0–1 | 0–1 | 0–1 |
| Euzko Alderdi Jeltzalea/Partido Nacionalista Vasco (RE) | 0 | 0 | 0–1 | 0–1 | 0–1 | 0–1 |
| Bloque Nacionalista Galego–Nós Candidatura Galega (Greens/EFA) | 0 | 0 | 0 | 0 | 0 | 0–1 |
| Coalición Canaria–Partido Nacionalista Canario (RE) | 0 | 0 | 0 | 0 | 0 | 0 |
| Unión del Pueblo Navarro (*) | 0 | 0 | 0 | 0 | 0 | 0 |
Partido Popular (EPP)
For a full overview of the results for this party, see the Partido Popular (EPP) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 0% | 100% | Last Result |
| 1 | 0% | 100% | |
| 2 | 0% | 100% | |
| 3 | 0% | 100% | |
| 4 | 0% | 100% | |
| 5 | 0% | 100% | |
| 6 | 0% | 100% | |
| 7 | 0% | 100% | |
| 8 | 0% | 100% | |
| 9 | 0% | 100% | |
| 10 | 0% | 100% | |
| 11 | 0% | 100% | |
| 12 | 0% | 100% | |
| 13 | 0% | 100% | |
| 14 | 0% | 100% | |
| 15 | 0% | 100% | |
| 16 | 0% | 100% | |
| 17 | 0% | 100% | |
| 18 | 0% | 100% | |
| 19 | 0% | 100% | |
| 20 | 0% | 100% | |
| 21 | 0.5% | 100% | |
| 22 | 6% | 99.5% | |
| 23 | 48% | 93% | Median |
| 24 | 39% | 46% | |
| 25 | 6% | 7% | |
| 26 | 0.9% | 0.9% | |
| 27 | 0% | 0% |
Partido Socialista Obrero Español (S&D)
For a full overview of the results for this party, see the Partido Socialista Obrero Español (S&D) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 0% | 100% | Last Result |
| 1 | 0% | 100% | |
| 2 | 0% | 100% | |
| 3 | 0% | 100% | |
| 4 | 0% | 100% | |
| 5 | 0% | 100% | |
| 6 | 0% | 100% | |
| 7 | 0% | 100% | |
| 8 | 0% | 100% | |
| 9 | 0% | 100% | |
| 10 | 0% | 100% | |
| 11 | 0% | 100% | |
| 12 | 0% | 100% | |
| 13 | 0% | 100% | |
| 14 | 0% | 100% | |
| 15 | 0% | 100% | |
| 16 | 2% | 100% | |
| 17 | 55% | 98% | Median |
| 18 | 38% | 44% | |
| 19 | 4% | 6% | |
| 20 | 2% | 2% | |
| 21 | 0% | 0% |
Vox (PfE)
For a full overview of the results for this party, see the Vox (PfE) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 0% | 100% | Last Result |
| 1 | 0% | 100% | |
| 2 | 0% | 100% | |
| 3 | 0% | 100% | |
| 4 | 0% | 100% | |
| 5 | 0% | 100% | |
| 6 | 0% | 100% | |
| 7 | 0% | 100% | |
| 8 | 0% | 100% | |
| 9 | 0% | 100% | |
| 10 | 0.1% | 100% | |
| 11 | 11% | 99.9% | |
| 12 | 35% | 89% | |
| 13 | 53% | 54% | Median |
| 14 | 0.9% | 0.9% | |
| 15 | 0% | 0% |
Movimiento Sumar–Izquierda Unida (GUE/NGL)
For a full overview of the results for this party, see the Movimiento Sumar–Izquierda Unida (GUE/NGL) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 0% | 100% | Last Result |
| 1 | 0% | 100% | |
| 2 | 75% | 100% | Median |
| 3 | 24% | 25% | |
| 4 | 0.4% | 0.4% | |
| 5 | 0% | 0% |
Catalunya en Comú–Més–Compromís–Más País–Chunta (Greens/EFA)
For a full overview of the results for this party, see the Catalunya en Comú–Més–Compromís–Más País–Chunta (Greens/EFA) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 0% | 100% | Last Result |
| 1 | 9% | 100% | |
| 2 | 90% | 91% | Median |
| 3 | 0.6% | 0.6% | |
| 4 | 0% | 0% |
Podemos (GUE/NGL)
For a full overview of the results for this party, see the Podemos (GUE/NGL) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 0% | 100% | Last Result |
| 1 | 56% | 100% | Median |
| 2 | 44% | 44% | |
| 3 | 0% | 0% |
Esquerra Republicana de Catalunya–Catalunya Sí (Greens/EFA)
For a full overview of the results for this party, see the Esquerra Republicana de Catalunya–Catalunya Sí (Greens/EFA) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 0% | 100% | Last Result |
| 1 | 73% | 100% | Median |
| 2 | 27% | 27% | |
| 3 | 0% | 0% |
Euskal Herria Bildu (GUE/NGL)
For a full overview of the results for this party, see the Euskal Herria Bildu (GUE/NGL) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 54% | 100% | Last Result, Median |
| 1 | 46% | 46% | |
| 2 | 0% | 0% |
Junts per Catalunya (NI)
For a full overview of the results for this party, see the Junts per Catalunya (NI) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 88% | 100% | Last Result, Median |
| 1 | 12% | 12% | |
| 2 | 0% | 0% |
Euzko Alderdi Jeltzalea/Partido Nacionalista Vasco (RE)
For a full overview of the results for this party, see the Euzko Alderdi Jeltzalea/Partido Nacionalista Vasco (RE) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 86% | 100% | Last Result, Median |
| 1 | 14% | 14% | |
| 2 | 0% | 0% |
Bloque Nacionalista Galego–Nós Candidatura Galega (Greens/EFA)
For a full overview of the results for this party, see the Bloque Nacionalista Galego–Nós Candidatura Galega (Greens/EFA) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 99.3% | 100% | Last Result, Median |
| 1 | 0.7% | 0.7% | |
| 2 | 0% | 0% |
Coalición Canaria–Partido Nacionalista Canario (RE)
For a full overview of the results for this party, see the Coalición Canaria–Partido Nacionalista Canario (RE) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 100% | 100% | Last Result, Median |
Unión del Pueblo Navarro (*)
For a full overview of the results for this party, see the Unión del Pueblo Navarro (*) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 100% | 100% | Last Result, Median |
Coalitions
Confidence Intervals
| Coalition | Last Result | Median | Majority? | 80% Confidence Interval | 90% Confidence Interval | 95% Confidence Interval | 99% Confidence Interval |
|---|---|---|---|---|---|---|---|
| Partido Popular (EPP) | 0 | 23 | 0% | 23–24 | 22–25 | 22–25 | 22–26 |
| Partido Socialista Obrero Español (S&D) | 0 | 17 | 0% | 17–18 | 17–19 | 17–19 | 16–20 |
| Vox (PfE) | 0 | 13 | 0% | 11–13 | 11–13 | 11–13 | 11–14 |
Partido Popular (EPP)
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 0% | 100% | Last Result |
| 1 | 0% | 100% | |
| 2 | 0% | 100% | |
| 3 | 0% | 100% | |
| 4 | 0% | 100% | |
| 5 | 0% | 100% | |
| 6 | 0% | 100% | |
| 7 | 0% | 100% | |
| 8 | 0% | 100% | |
| 9 | 0% | 100% | |
| 10 | 0% | 100% | |
| 11 | 0% | 100% | |
| 12 | 0% | 100% | |
| 13 | 0% | 100% | |
| 14 | 0% | 100% | |
| 15 | 0% | 100% | |
| 16 | 0% | 100% | |
| 17 | 0% | 100% | |
| 18 | 0% | 100% | |
| 19 | 0% | 100% | |
| 20 | 0% | 100% | |
| 21 | 0.5% | 100% | |
| 22 | 6% | 99.5% | |
| 23 | 48% | 93% | Median |
| 24 | 39% | 46% | |
| 25 | 6% | 7% | |
| 26 | 0.9% | 0.9% | |
| 27 | 0% | 0% |
Partido Socialista Obrero Español (S&D)
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 0% | 100% | Last Result |
| 1 | 0% | 100% | |
| 2 | 0% | 100% | |
| 3 | 0% | 100% | |
| 4 | 0% | 100% | |
| 5 | 0% | 100% | |
| 6 | 0% | 100% | |
| 7 | 0% | 100% | |
| 8 | 0% | 100% | |
| 9 | 0% | 100% | |
| 10 | 0% | 100% | |
| 11 | 0% | 100% | |
| 12 | 0% | 100% | |
| 13 | 0% | 100% | |
| 14 | 0% | 100% | |
| 15 | 0% | 100% | |
| 16 | 2% | 100% | |
| 17 | 55% | 98% | Median |
| 18 | 38% | 44% | |
| 19 | 4% | 6% | |
| 20 | 2% | 2% | |
| 21 | 0% | 0% |
Vox (PfE)
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 0% | 100% | Last Result |
| 1 | 0% | 100% | |
| 2 | 0% | 100% | |
| 3 | 0% | 100% | |
| 4 | 0% | 100% | |
| 5 | 0% | 100% | |
| 6 | 0% | 100% | |
| 7 | 0% | 100% | |
| 8 | 0% | 100% | |
| 9 | 0% | 100% | |
| 10 | 0.1% | 100% | |
| 11 | 11% | 99.9% | |
| 12 | 35% | 89% | |
| 13 | 53% | 54% | Median |
| 14 | 0.9% | 0.9% | |
| 15 | 0% | 0% |
Technical Information
Opinion Poll
- Polling firm: Sigma Dos
- Commissioner(s): El Mundo
- Fieldwork period: 20–26 August 2026
Calculations
- Sample size: 2173
- Simulations done: 2,097,152
- Error estimate: 0.67%