Hallador Energy CO (HNRG) SEC Filings — 2026 1 SEC filing for Hallador Energy CO (HNRG) in 2026. FilingsHallador Energy CO 8-K Filing — 8-K · Apr 15, 2026 ExploreAll HNRG Filings · HNRG 2025 · All 2026 Filings