COLB Stock Rallies 33% in 6 Months: Can It Sustain the Momentum?

Columbia Banking shares have risen 32.6% over six months after completing the Pacific Premier acquisition and reporting a strong Q3 2025 (total revenue +17% y/y, NII +17%, NIM 3.84% vs 3.56% prior year), while expanding its Western footprint. Management expects NIM “just north of” 3.90% in Q4 2025 (with ~8 bps uplift from ~$12m of deposit premium amortization) and a similar NIM in early-2026, and is forecasting deposit-cost relief (targeting ~50% deposit betas on cuts), $127m of annual cost saves from the deal (with $48m realized), a $700m buyback authorization through Nov. 2026 and a raised quarterly dividend of $0.37 (5.1% yield); CET1 was 11.6% as of Sept. 30. The bank plans to run off roughly $8bn of transactional loans over eight quarters and shift toward relationship C&I, owner-occupied CRE and fee income platforms, aiming for a normalized expense run-rate by Q3 2026 following a Q1 2026 systems conversion. Valuation stands at ~9.5x forward earnings (Zacks $31 target) with 2025/2026 EPS consensus of $2.91/$3.07; upside depends on delivering NIM targets, expense synergies and steady credit, with execution shortfalls posing downside risk.

Analysis

Columbia Banking (COLB) has outperformed peers and the industry, rising 32.6% over six months following the August close of the Pacific Premier acquisition and a strong Q3 2025 print where total revenues increased 17% year‑over‑year, net interest income rose 17%, and NIM improved to 3.84% from 3.56% a year ago. Management expects Q4 2025 NIM to be “just north of” 3.90%, driven in part by ~8 basis points of temporary uplift from roughly $12 million of deposit premium amortization, and targets a similar NIM for Q1 2026 with slightly lower earning assets. The shares currently trade at ~9.5x forward earnings with a Zacks $31 target and EPS consensus of $2.91 for 2025 and $3.07 for 2026.

Capital return and capital strength are supportive: the board authorized up to $700 million in share repurchases through Nov. 30, 2026, the quarterly dividend was raised to $0.37 (5.1% yield), and CET1 and total risk‑based ratios stood at 11.6% and 13.4% as of Sept. 30, 2025. Execution items that will determine upside are realization of $127 million annual cost saves (with $48 million realized), delivery of the $330–$340 million quarterly operating expense run rate ex‑CDI, timely Pacific Premier systems conversion (Q1 2026) and steady credit as the bank runs off ~$8 billion of transactional loans over ~eight quarters.

Key Decisions for Investors

• Consider modestly accumulating on pullbacks if upcoming Q4/Q1 reported NIM (net of the ~$12m amortization) meets guidance and deposit betas show targeted easing,
• Monitor integration KPIs—realized cost savings, conversion timing (Q1 2026) and the targeted $330–$340m expense run rate—and trim exposure if those milestones slip,
• Use the $700m buyback authorization and 5.1% yield as supportive factors for a hold/overweight stance versus smaller regional peers, but hedge position sizing against execution and credit‑runoff risk,
• Track core metrics (NIM ex‑one‑offs, deposit beta, loan runoff pace and credit metrics) as the primary triggers for moving to a stronger overweight or initiating reductions