BOK Financial Q1 2026 Gross Margin Drivers and Outlook

Main drivers of BOK Financial’s gross margin performance in Q1 2026 (from provided disclosures)

The excerpts provided are from BOK Financial’s Q1 2026 earnings call, and the company’s margin discussion is framed primarily around net interest margin (NIM) / core net interest margin—i.e., the “spread” component of gross margin for a bank’s earnings model. In the call, management attributes the quarter’s margin movement to a mix of positives (repricing + loan growth) and a confluence of small negatives that together compressed margins.

1) Positive drivers: fixed-rate asset repricing and loan growth

Management explicitly states that two items were positive drivers of the quarter’s margin performance:

• Fixed-rate asset repricing supported margin, and management describes it as a key durable factor in the margin outlook. ¹²
• Loan growth was also a positive driver for the quarter, and management expects these effects to persist through 2026. ¹

In addition, CEO comments emphasize that total loans grew $536 million (2.1% sequentially) in Q1 2026, indicating the loan growth component underlying the margin benefit. ³

2) Negative driver: core net interest margin compression from several offsetting items

Management describes margin compression as resulting from multiple small negative impacts that “accumulated” enough to overcome the repricing and growth positives. ¹

The call highlights the following margin-relevant negatives:

• Noninterest DDA declined, characterized as the seasonal low point in Q1; management also notes day count played a role. ¹
• Loan fees were down sequentially, which management lists as another small negative contributing to the quarter’s results. ¹
• SOFR spreads reversed to normal after being abnormally wide in Q4, which had benefited the prior quarter; management says the return to normal in Q1 drove compression sequentially. ¹
• Funding costs for counterparty margin posted to exchanges for energy derivatives had a small negative effect. ¹
• Full-quarter impact of sub debt issued last November added another negative pressure, with each listed factor described as individually ~1–2 bps negative but collectively enough to outweigh the positives. ¹

3) Net interest margin moved down: reported NIM and core margin both declined

The margin story is anchored by the reported metric movement:

• Net interest income decreased $2.7 million and reported net interest margin declined 8 basis points in Q1 2026. ¹
• Excluding trading, core net interest income decreased $4.8 million and core margin declined 7 basis points. ¹

This gives a direct quantitative summary of the gross margin/spread compression management was discussing. ¹

4) Context supporting gross margin direction: deposits and repricing still expected to improve

While Q1 experienced compression, management’s forward view was that margin should expand as the year progresses:

• Management says they continue to expect margin expansion over the course of 2026, and that fixed-rate asset repricing and loan growth are expected to persist as drivers. ¹
• In Q&A, management reinforces that the durable long-term factor behind margin is fixed-rate asset repricing, with deposit betas expected to be relatively stable “without rate moves.” ²

Separately, on deposits funding conditions:

• Management notes that an opportunistic wholesale deposit trade in Q4 “ran off” in Q1 and was the main driver of the deposit decline from Q4 to Q1. ⁴
  (This matters for gross-margin/spread dynamics because deposits and funding mix influence funding costs and, indirectly, margin, even though management’s main “confluence” explanation for Q1’s margin compression focuses on the items listed above.) ⁴¹

Bottom line

In Q1 2026, BOK’s gross margin performance (as reflected by NIM/core margin) was driven by:

• Upside: fixed-rate asset repricing and loan growth helped. ¹²
• Downside: a simultaneous cluster of small negatives—notably DDA decline/day count, lower loan fees, SOFR spread normalization after Q4, energy derivatives counterparty margin funding costs, and the full-quarter effect of sub debt issued in November—collectively overcame the positives and resulted in 8 bps lower reported NIM and 7 bps lower core margin. ¹
• Trajectory: management expects margin expansion during 2026, with repricing and loan growth continuing as key drivers. ¹