Opinion Poll by Sigma Dos for El Mundo, 16–31 March 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% | 32.5% | 31.1–33.9% | 30.8–34.3% | 30.4–34.6% | 29.8–35.3% |
| Partido Socialista Obrero Español (S&D) | 0.0% | 27.7% | 26.4–29.0% | 26.0–29.4% | 25.7–29.7% | 25.1–30.4% |
| Vox (PfE) | 0.0% | 17.1% | 16.0–18.2% | 15.8–18.6% | 15.5–18.9% | 15.0–19.4% |
| Movimiento Sumar–Catalunya en Comú–Més–Compromís–Más País–Chunta (Greens/EFA) | 0.0% | 4.7% | 4.2–5.4% | 4.0–5.6% | 3.9–5.8% | 3.6–6.1% |
| Podemos (GUE/NGL) | 0.0% | 3.5% | 3.0–4.1% | 2.9–4.3% | 2.8–4.5% | 2.6–4.7% |
| Movimiento Sumar–Izquierda Unida (GUE/NGL) | 0.0% | 2.9% | 2.5–3.5% | 2.3–3.6% | 2.3–3.8% | 2.1–4.0% |
| Esquerra Republicana de Catalunya–Catalunya Sí (Greens/EFA) | 0.0% | 1.8% | 1.4–2.2% | 1.4–2.4% | 1.3–2.5% | 1.1–2.7% |
| Euskal Herria Bildu (GUE/NGL) | 0.0% | 1.4% | 1.1–1.8% | 1.0–1.9% | 0.9–2.0% | 0.8–2.2% |
| Euzko Alderdi Jeltzalea/Partido Nacionalista Vasco (RE) | 0.0% | 1.1% | 0.9–1.5% | 0.8–1.6% | 0.7–1.7% | 0.6–1.9% |
| Junts per Catalunya (NI) | 0.0% | 1.0% | 0.8–1.4% | 0.7–1.5% | 0.7–1.6% | 0.6–1.8% |
| Bloque Nacionalista Galego–Nós Candidatura Galega (Greens/EFA) | 0.0% | 0.6% | 0.4–0.9% | 0.4–1.0% | 0.4–1.1% | 0.3–1.2% |
| Coalición Canaria–Partido Nacionalista Canario (RE) | 0.0% | 0.5% | 0.4–0.8% | 0.3–0.9% | 0.3–0.9% | 0.2–1.1% |
| Unión del Pueblo Navarro (*) | 0.0% | 0.2% | 0.1–0.4% | 0.1–0.5% | 0.1–0.5% | 0.0–0.7% |
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 | 22–24 | 21–25 | 21–25 | 20–25 |
| Partido Socialista Obrero Español (S&D) | 0 | 19 | 18–20 | 18–20 | 17–20 | 17–21 |
| Vox (PfE) | 0 | 11 | 10–12 | 10–13 | 10–13 | 10–13 |
| Movimiento Sumar–Catalunya en Comú–Més–Compromís–Más País–Chunta (Greens/EFA) | 0 | 3 | 2–3 | 2–3 | 2–3 | 2–4 |
| Podemos (GUE/NGL) | 0 | 2 | 2–3 | 2–3 | 1–3 | 1–3 |
| Movimiento Sumar–Izquierda Unida (GUE/NGL) | 0 | 1 | 1–2 | 1–2 | 1–2 | 1–2 |
| Esquerra Republicana de Catalunya–Catalunya Sí (Greens/EFA) | 0 | 1 | 1 | 0–1 | 0–1 | 0–1 |
| Euskal Herria Bildu (GUE/NGL) | 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 |
| Junts per Catalunya (NI) | 0 | 0 | 0 | 0 | 0–1 | 0–1 |
| Bloque Nacionalista Galego–Nós Candidatura Galega (Greens/EFA) | 0 | 0 | 0 | 0 | 0 | 0 |
| 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 | 0.6% | 100% | |
| 21 | 7% | 99.4% | |
| 22 | 28% | 93% | |
| 23 | 36% | 65% | Median |
| 24 | 23% | 29% | |
| 25 | 7% | 7% | |
| 26 | 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 | 0% | 100% | |
| 17 | 3% | 100% | |
| 18 | 29% | 97% | |
| 19 | 41% | 69% | Median |
| 20 | 27% | 28% | |
| 21 | 2% | 2% | |
| 22 | 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 | 0.1% | 100% | |
| 10 | 19% | 99.9% | |
| 11 | 43% | 81% | Median |
| 12 | 32% | 38% | |
| 13 | 5% | 5% | |
| 14 | 0% | 0% |
Movimiento Sumar–Catalunya en Comú–Més–Compromís–Más País–Chunta (Greens/EFA)
For a full overview of the results for this party, see the Movimiento Sumar–Catalunya en Comú–Més–Compromís–Más País–Chunta (Greens/EFA) page.
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 0% | 100% | Last Result |
| 1 | 0% | 100% | |
| 2 | 24% | 100% | |
| 3 | 73% | 76% | Median |
| 4 | 2% | 2% | |
| 5 | 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 | 4% | 100% | |
| 2 | 80% | 96% | Median |
| 3 | 16% | 16% | |
| 4 | 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 | 57% | 100% | Median |
| 2 | 43% | 43% | |
| 3 | 0.1% | 0.1% | |
| 4 | 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 | 8% | 100% | Last Result |
| 1 | 92% | 92% | Median |
| 2 | 0.1% | 0.1% | |
| 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% |
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 | 88% | 100% | Last Result, Median |
| 1 | 12% | 12% | |
| 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 | 95% | 100% | Last Result, Median |
| 1 | 5% | 5% | |
| 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 | 99.9% | 100% | Last Result, Median |
| 1 | 0.1% | 0.1% | |
| 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% | 22–24 | 21–25 | 21–25 | 20–25 |
| Partido Socialista Obrero Español (S&D) | 0 | 19 | 0% | 18–20 | 18–20 | 17–20 | 17–21 |
| Vox (PfE) | 0 | 11 | 0% | 10–12 | 10–13 | 10–13 | 10–13 |
| Unión del Pueblo Navarro (*) | 0 | 0 | 0% | 0 | 0 | 0 | 0 |
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 | 0.6% | 100% | |
| 21 | 7% | 99.4% | |
| 22 | 28% | 93% | |
| 23 | 36% | 65% | Median |
| 24 | 23% | 29% | |
| 25 | 7% | 7% | |
| 26 | 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 | 0% | 100% | |
| 17 | 3% | 100% | |
| 18 | 29% | 97% | |
| 19 | 41% | 69% | Median |
| 20 | 27% | 28% | |
| 21 | 2% | 2% | |
| 22 | 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 | 0.1% | 100% | |
| 10 | 19% | 99.9% | |
| 11 | 43% | 81% | Median |
| 12 | 32% | 38% | |
| 13 | 5% | 5% | |
| 14 | 0% | 0% |
Unión del Pueblo Navarro (*)
| Number of Seats | Probability | Accumulated | Special Marks |
|---|---|---|---|
| 0 | 100% | 100% | Last Result, Median |
Technical Information
Opinion Poll
- Polling firm: Sigma Dos
- Commissioner(s): El Mundo
- Fieldwork period: 16–31 March 2026
Calculations
- Sample size: 1958
- Simulations done: 2,097,152
- Error estimate: 1.40%