Completed strategic M&A and system conversion
Closed mergers with American Bank Holding (effective Jan 1, 2026) and Southwest Bancshares (Feb 1, 2026); received regulatory approvals for Stellar Bancorp and expect close on July 1, 2026. Completed a core system (DNA) conversion in February 2026. Operational integration timelines announced: American operational integration scheduled for September 2026, Southwest for November 2026, and Stellar integration planning underway.
Net interest income growth and margin expansion
Net interest income (pre-provision) was $321.2M for Q1 2026, up $55.8M YoY. Tax-equivalent net interest margin expanded to 3.51% (Q1 2026) — a 37 bps increase vs Q1 2025 and 21 bps improvement vs Q4 2025; excluding accounting adjustments NIM was 3.44% vs 3.10% YoY. Management expects Q2 NIM to be flat-to-slightly higher and targets a combined year-end exit NIM of ~3.70% (3.60% average for 2026 including Stellar).
Significant growth in balance sheet (M&A-driven)
Loans grew to $25.2B at March 31, 2026 (+15.1% YoY; +16.0% linked quarter) and deposits increased to $32.6B (+16.4% YoY; +14.6% linked quarter). Management noted that these increases were driven primarily by the American and Southwest acquisitions; excluding acquired balances, core deposits rose ~1.2%.
Adjusted earnings (ex-merger charges) showing improvement
Reported net income for the quarter was $116M (EPS $1.16) but excluding $42.5M of merger-related expenses net income was $149.9M and diluted EPS was $1.50, which represents a 9.5% increase over prior-year reported EPS of $1.37.
Strong capital and shareholder returns
Repurchased ~837,000 shares at an average price of $68.15 for a total of ~$57M in Q1 2026. Management emphasized a strong capital position, noted projected excess earnings capacity (referenced as ~$500–$600M post-dividends on a pro forma basis) and indicated continued opportunistic buybacks. Basel III Endgame mortgage treatment could provide ~50 bps capital benefit when finalized.
Securities and funding positioning
Added roughly $1.4B of securities in Q1 with purchase yields in the ~4.50%–4.85% range; bond portfolio has a modified duration of ~3.8 and projected annual cash flows of ~ $2.1B. Management expects additional securities purchases and modestly higher bond yields going forward.
Industry recognition and regional positioning
Prosperity was named one of Forbes America's Best Banks for 2026 (top 10 for 14 consecutive years), recognized by Newsweek as one of America’s Best Regional Banks and ranked 15th in S&P Global Market Intelligence’s top 50 U.S. public bank rankings for 2025. Management highlighted Texas/Oklahoma economics and franchise density as competitive advantages.
Near-term financial guidance
Guidance provided: Q2 noninterest expense expected $176M–$180M (excludes potential additional one-time merger items); Q2 fair value loan accretion income expected ~$3M–$4M; management reiterated objective to drive efficiency back toward mid-40s (historic mid-40s efficiency ratio) as integrations complete and cost saves are realized.