The PSC would win the regional elections in Catalonia again, but would suffer a significant setback compared to the 2024 elections and would lose any possibility of re-establishing the parliamentary majority that allowed the investiture of Salvador Illa. This is according to a Sigma Dos poll for El Mundo, which places the socialists in a range of between 33 and 35 seats, compared to the 42 obtained two years ago.
The poll, conducted on May 26, also depicts a much more fragmented political scenario than the current one. The tripartite formed by PSC, ERC, and Comuns would fall far short of the absolute majority of 68 deputies, while the big news of the survey would be the spectacular growth of Aliança Catalana, which would go from two seats to a range of between 19 and 22 representatives.
The result would be a Parliament without clear governing blocs and with enormous difficulties in articulating a stable majority.
Aliança Catalana stars in the big electoral leap
The main conclusion of the poll is the growth of Aliança Catalana, the party led by Sílvia Orriols. According to the survey, it would go from the current two deputies to a representation of between 19 and 22 seats, becoming one of the most relevant forces in the Catalan Chamber.
The data published by El Mundo indicates that the party's growth would come from very diverse electorates. It would capture support from Junts, ERC, Vox, PP, and even the PSC, becoming the main recipient of votes from other parties.
The immediate political consequence would be a profound transformation of the pro-independence space, which would cease to be dominated exclusively by Junts and ERC.
PSC and Junts lose strength compared to 2024
The poll also reflects a significant deterioration of the two forces that led the 2024 regional elections. The PSC would remain the most voted party, but would lose between seven and nine deputies compared to the last elections.
For its part, Junts would register an even more pronounced drop. The party led by Carles Puigdemont would go from 35 deputies to a range between 20 and 24 seats.
The comparison with the 2024 results shows the magnitude of the changes:
• PSC: 42 seats → 33-35.
• Junts: 35 seats → 20-24.
• ERC: 20 seats → 19-21.
• Aliança Catalana: 2 seats → 19-22.
While PSC and Junts clearly regress, ERC would experience hardly any variations and would maintain a representation similar to the current one.
The poll thus suggests an internal redistribution of support that profoundly alters the Catalan political balance that emerged after the 2024 elections.
Tie between PP and Vox
The PP and Vox would be practically tied in parliamentary representation. In the 2024 regional elections, the Popular Party had achieved a lead of four deputies over Vox. The new poll significantly reduces that gap and places both parties at very similar levels of support.
Meanwhile, the Comuns would obtain between five and six deputies and the CUP between three and five. The sum of all these variations paints a much more fragmented Chamber than the current one and with greater difficulties in building governing alliances.
Source: Sigma Dos for El Mundo, published on 06/08/2026.
| PARTY | SEATS | % VOTES |
| PSC | 33-35 | 23.9 |
| Junts | 20-24 | 14.2 |
| AC | 19-22 | 13.8 |
| ERC | 19-21 | 13.2 |
| PP | 13-15 | 10.2 |
| Vox | 13-15 | 10.1 |
| Comuns | 5-6 | 5.5 |
| CUP | 3-5 | 4 |