**The Berlin Abgeordnetenhaus electoral system, based on personalized proportional representation across 78 constituencies and 12 borough lists with a 5% threshold, determines final seat totals through overhang mandates and leveling seats.** The September 20, 2026 election produced a fragmented result with Die Linke at 25.7%, CDU at 18.8%, AfD at 16.3%, Greens at 14.3%, and SPD at 12.1%, while BSW and FDP fell short. Initial projections pointed to 158 seats due to direct-mandate overhangs, but a post-election recount in one Spandau constituency eliminated a CDU direct seat and associated overhang, reducing the certified total to 153 seats. This outcome aligns with the dominant 153–157 market range, as traders incorporated the confirmed adjustment over earlier higher estimates. Coalition negotiations remain ongoing without altering the fixed seat count.