Summit Credit Union, founded in 1935, is a credit union based in Cottage Grove, Wisconsin, United States. As of 2025, it has 58 locations throughout the state. Summit has more than 270,000 members and ...

Now the state’s second-largest credit union with 191,000 members and 635 employees, Summit recently completed a $50 million headquarters in Cottage Grove that houses about 250 employees — with room ...

Madison-native Kim Sponem has led Summit Credit Union since 2002. Over the past 23 years, Sponem has led Summit’s growth from $200 million in assets to over $7.8 billion with more than 271,740 members ...

Engaged leadership, a culture of building employee skills and a commitment to helping members boosted Summit Credit Union to the top spot among large firms in this year’s Top Workplaces project.