Calgary – September 25, 2026 -- Horizon Petroleum Ltd. (TSXV: HPL; FRA/Tradegate: HPM) said its wholly owned Polish subsidiary, Energia Karpaty Zachodnie sp. z o.o., has completed acid stimulation at the Lachowice 7 well in southern Poland and begun production testing, with preliminary flowback rates reaching 5.5 million cubic feet per day of natural gas.