**Switzerland, Sweden, Austria, and Northern Ireland currently lead their respective League B groups after four matchdays in the 2026-27 UEFA Nations League, positioning them as frontrunners for direct promotion to League A.** Switzerland holds a perfect record and commanding points lead in Group 1, while Sweden sits atop Group 4 with strong results. Austria and Northern Ireland maintain narrow advantages in Groups 3 and 2 amid tighter races involving Kosovo, Republic of Ireland, Hungary, and Bosnia and Herzegovina. The final two matchdays in November will determine the four group winners, who earn automatic promotion; runners-up advance to promotion play-offs against League A sides. Recent form, home/away results, and remaining fixtures against lower-ranked opponents shape trader consensus on these outcomes.