William F. Bieber

TCF Financial Corp. is the holding company for TCF National Bank, which engages in the provision of checking, savings, consumer loans, collecting funds, investing funds, managing funds, leasing and mortgage services. It also offers commercial real estate loans, commercial business loans and consumer loans. It operates business through three segments: Consumer Banking, Wholesale Banking and Enterprise Services. The Consumer Banking segment is comprised of all of the company's consumer-facing businesses and includes retail banking, consumer real estate and auto finance. The Wholesale Banking segment is comprised of commercial lending, leasing and equipment and inventory finance. The Enterprise Services is comprised of corporate treasury, which includes the Company's investment and borrowing portfolios and management of capital, debt and market risks; corporate functions such as information technology, risk and credit management, bank operations, finance, investor relations, corporate development, legal and human capital management. The company was founded on April 28, 1987 and is headquartered in Wayzata, MN.

AcroTech Industries, Inc. markets and distributes dry film graphite lubricants. The private company is based in Lake in the Hills, IL and has subsidiaries in United States.

Acrometal Cos., Inc. manufactures fabricated metal products. The private company is based in Minneapolis, MN.

ATEK Manufacturing LLC provides corporate oversight to a group of companies, including ATEK Access Technologies and ATEK Metal Technologies. It offers electrical assembly and supply chain management services. The company was founded in 1946 by Bill Bieber and is headquartered in Eden Prairie, MN.

ATEK Cos., Inc. manufactures aluminum castings, machined and assembled components. It offers disposable and electro-mechanical medical device development, launch, assembly, manufacturing, packaging, labeling, microbiology, sterilization management, supply chain management and distribution services. The firm also manufactures aluminum and plastic reels and sensing, security and safety systems, including door activation mats and push plate switches for the automatic door industry, heavy duty safety presence sensing mats used for industrial machine safeguarding and consumer privacy protection products for the security markets. The company is headquartered in Eden Prairie, MN.