Signature Bancorporation

What Signature Bancorporation does

Signature Bancorporation, Inc. is a privately held Illinois-based bank holding company founded in 2006 that wholly owns Signature Bank, an Illinois state-chartered, FDIC-insured commercial bank headquartered in Rosemont with additional branches in Chicago (Wacker and Devon), Edison Park, and Milwaukee. The bank provides commercial banking, commercial and CRE lending, treasury management, SBA lending, corporate cards, fraud protection tools (Positive Pay, ACH blocks, real-time alerts), and digital banking, complemented by Signature Chicago Wealth Management for investment advisory and the recently launched Signature Trust Company for estate and fiduciary services. Personal banking (checking, savings, money markets, CDs, debit cards, Zelle) is offered as an adjunct to business relationships.

The company operates a relationship-based, direct-sales go-to-market model led by founders Michael G. O'Rourke (President and CEO, 30+ years experience), Kevin P. Bastuga, and Bryan D. Duncan, supported by dozens of named relationship managers, VPs, and officers—no call centers, direct access to decision-makers. Its core customers are middle-market and closely held businesses, family-owned companies, professional services firms, and CRE investors in the Chicago-Wisconsin region, with named logos spanning manufacturing (Benz Metal Products), healthcare real estate (Capital Healthcare Properties), real estate development (Hubbard Street Group), and entertainment (F1 Arcade). Revenue is generated through net interest income on the commercial/CRE/consumer loan portfolio, fee income from treasury management, wealth management, and banking services, and deposit services across checking, savings, money markets, and CDs.

Signature Bancorporation holds approximately $2 billion in assets with 107 dedicated employees as of 2026, has been profitable for 9 consecutive years, ranks top 3% in efficiency per S&P, and has been recognized 9 consecutive years on American Banker Best Banks to Work For and 5 consecutive years on the Inc. 5000. In March 2026 the company entered a definitive merger agreement to be acquired by Esquire Financial Holdings (NASDAQ: ESQ) in an all-stock transaction valued at approximately $348.4 million; all required regulatory approvals were received by June 2026, with closing expected in Q3 2026 and Signature Bank to operate as a division of Esquire Bank post-close.

Name

Signature Bancorporation

Legal name

Signature Bancorporation, Inc.

Website

https://signaturebank.bank

Company type

Private

Founded year

2006

Operating status

Operating

Headcount range

101–250 employees

Short description

Signature Bancorporation is the privately held holding company of Signature Bank, a relationship-driven Illinois state-chartered commercial bank serving middle-market, family-owned, and professional services businesses across the Chicago-Wisconsin region with lending, treasury management, wealth management, and trust services.

Ownership category

akta.pro rank

Product category

Commercial Banking

NAICS

Commercial Banking (522110)

SIC

State Commercial Banks (6022)

akta.pro primary industry

SME Deposits & Business Accounts (Operating, Savings, CDs) (FSABABAC)

Keywords

• Commercial banking services
• Commercial real estate lending
• Treasury management solutions
• Wealth management advisory
• Business banking services

Headquarters

HQ city

Rosamond

HQ country

United States

HQ region

North America

Offices5 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Interest Income: Revenue from commercial lending, commercial real estate lending, and consumer lending activities. Core banking income derived from loan portfolio.
2. Fee Income: Treasury management fees, wealth management fees, commercial banking service fees, and digital banking services.
3. Deposit Services: Revenue from deposit accounts including checking, savings, money markets, and CDs. Low-cost core commercial deposits are a key funding source.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels6 records

Core offering

Signature Bancorporation, through its wholly-owned subsidiary Signature Bank, provides relationship-driven commercial banking services including commercial lending, treasury management, commercial real estate financing, and SBA lending to middle-market businesses and closely held companies. The company also offers personal banking products (checking, savings, money markets, CDs, debit cards, Zelle), wealth management through Signature Chicago Wealth Management, trust services via Signature Trust Company, and the Finrails AP automated B2B payments platform. Revenue is generated through interest income on loans, fee income from treasury and wealth management services, and deposit-related spreads.

Product overview

Signature Bancorporation operates Signature Bank, a relationship-based commercial bank founded in 2006. The company offers a unified suite of banking products comprising core commercial banking services (Commercial Banking, Commercial Lending, Treasury Management, SBA Lending), digital banking capabilities, and add-on services including Wealth Management, Signature Trust Company, Corporate Card, and Fraud Protection tools (Positive Pay, ACH blocks). The bank also provides personal banking services. Finrails AP is offered as an automated B2B payments platform. The product portfolio is designed for middle-market businesses, privately held companies, and individuals in the Chicago-Wisconsin market area.

Differentiator

Problem solved

Functional benefit

Brands

• Signature Trust Company: Trust administration, estate planning support and fiduciary management services launched in January 2026 in partnership with Midwest Trust
• Signature Chicago Wealth Management
• Finrails AP

Products and services

• Commercial Banking Full-service commercial banking tailored to business needs for middle-market and closely held companies in the Chicago-Wisconsin region, including lending, treasury management, and ongoing relationship banking with dedicated relationship managers.
• Commercial Lending Customized financing solutions to fuel business growth for commercial clients, including commercial real estate lending, equipment financing, facility expansion financing, and SBA lending for small businesses.
• Treasury Management Treasury management services to enhance productivity and minimize risk for business clients, including cash management solutions, payment processing, and operational banking services.
• Digital Banking Online and mobile banking platform accessible anytime, anywhere with features including bill payment, funds transfer, mobile deposit, account monitoring, and electronic image viewing for personal and commercial customers.
• Personal Banking Personal banking services including checking accounts, savings, money markets, CDs, Visa debit cards with ATM fee reimbursement up to $25 per month, and Zelle payment services for individual consumers and business owner families.
• Wealth Management Professional, personalized investment advice and wealth management services delivered through Signature Chicago Wealth Management subsidiary, providing customized, comprehensive investment strategies for clients pursuing financial goals.
• Signature Trust Company Trust administration, estate planning support, and fiduciary management services launched in partnership with Midwest Trust, providing personalized trust and legacy planning services for clients.
• Finrails AP Fully integrated payments platform that automates business-to-business payments through a seamless and secure online dashboard, eliminating paper checks from the mail for commercial clients.

Quantifiable outcome

• 9 consecutive years of record profitability through 2025
• +2 more outcomes

Named customers5 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration2 records

Feature5 records

Partnerships

One partnership is on record.

• Midwest TrustcoreStrategic or Co-development Partner · 1 January 2026Partnership to launch Signature Trust Company in January 2026, extending the bank's ability to support clients with estate, fiduciary and legacy planning services. Combines Signature Bank's relationship-based approach with Midwest Trust's fiduciary expertise.

Scale indicators11 records

Recent moves9 records

Expansion highlights5 records

Direct peers

• Wintrust Financial Corporation: Chicago-based super-community bank focused on middle-market businesses, commercial real estate lending, and wealth management across the Midwest. Highly comparable to Signature's commercial banking, CRE lending, and relationship-driven model, though significantly larger in scale.
• Byline Bancorp: Chicago-based commercial bank serving small and middle-market businesses with lending, treasury management, and personal banking. Closely aligned with Signature's middle-market, Chicago-focused commercial banking strategy and similar asset size band.
• First Bank of Highland Park: Chicago-area community bank serving closely held and family-owned businesses with relationship-driven commercial banking. Direct competitor in the same Chicago suburban middle-market niche that Signature targets.
• Inland Bank and Trust: Illinois-chartered community bank headquartered in the Chicago suburbs providing commercial, personal, and wealth management banking. Comparable asset size, customer segment, and product mix to Signature Bancorporation.
• Associated Bancorp: Wisconsin-headquartered bank holding company with strong Chicago-area presence serving middle-market commercial clients. Direct overlap with Signature's Wisconsin expansion and commercial banking focus.
• First Midwest Bancorp (legacy): Pre-merger First Midwest was a Chicago-area commercial bank serving middle-market businesses with comparable product set including lending, treasury management and wealth. Useful as a historical comparable for Signature's target scale and exit trajectory.

Broad incumbents

• Old National Bancorp: Large Midwest regional bank (post-First Midwest merger) offering commercial banking, wealth, and treasury services across multiple states. Broader incumbent competitor in the same Midwest middle-market space Signature serves.
• Huntington Bancshares: Midwest super-regional bank with growing commercial middle-market and CRE lending franchise, especially post-Capitol acquisition. Competes with Signature for Chicago-area middle-market and CRE clients at larger scale.
• BMO Harris Bank (BMO Financial Group): Major Chicago-based commercial bank with deep middle-market, CRE, treasury management, and wealth capabilities. Represents the large-incumbent competitive pressure Signature explicitly positions against.

Others

• Esquire Financial Holdings: NASDAQ-listed bank holding company that agreed to acquire Signature Bancorporation for $348.4M in March 2026. Relevant as the named acquirer and an indicator of acquirer-side valuation benchmarks for niche commercial banking franchises.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xtwitter.com/SignatureBnkChi
• LinkedInlinkedin.com/company/signature-bank

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles14 records

Subsidiaries3 records

Funding overview

Funding rounds1 record

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Signature Bancorporation