Columbia Financial, INC. (CLBK) SEC Filings — 2026 1 SEC filing for Columbia Financial, INC. (CLBK) in 2026. FilingsColumbia Financial Files 8-K on Financial Results — 8-K · Apr 20, 2026 ExploreAll CLBK Filings · CLBK 2025 · All 2026 Filings