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Company information
Portfolio Services Limited Inc., Express Systems Inc., Portfolio SE Inc. and NAE/NWAN LLC are wholly owned subsidiaries of Portfolio Holding Inc. They serve as the administrator and/or obligor for a variety of aftermarket products.
Portfolio Services Limited Inc.
Calif. DBA Portfolio Insurance Services Inc. No. OI81316
Portfolio SE Inc., Fla. License No. 31865
14651 Dallas Parkway Suite 502
Dallas TX 75254
Express Systems Inc.
California DBA Express Systems Insurance Services No. OF84414
25541 Commercentre Drive Suite 100
Lake Forest CA 92630
NAE/NWAN LLC
8370 Dow Circle Suite 100
Strongsville OH 44136












As vice president of sales and marketing, Tanya Stevenson built and continues to lead Portfolio’s product development and product marketing teams. Together they have launched dozens of new products at the leading edge of innovation, all with diverse input from the field and within strict compliance standards. She has negotiated and secured key vendor relationships and led the larger part of the company’s underwriting initiatives. Tanya also oversees all support functions for Portfolio’s agent representatives and regularly joins them for F&I and dealership training nationwide.
As vice president of information technology, Mark Slyder leads Portfolio’s strategic and operational IT initiatives, global cybersecurity and the evaluation and deployment of future technology platforms utilized companywide. He brings more than 20 years of experience leading technology innovation and digital transformation strategies in the telecommunications, insurance, manufacturing and auto industries. Mark previously served as enterprise IT director at SmithFoods, helping the firm accelerate their Industry 4.0 transformation through MRP, data warehouse and SCADA system implementations. He earned his BS in management information systems from Miami University.