Southfield Capital | 2,152 followers on LinkedIn. Southfield Capital is a private equity firm that partners with exceptional growing companies in the lower middle market. | Southfield Capital is a private equity firm that invests in exceptional, growing companies in the lower middle market. The firm makes control investments in North American companies generating $4 - 20 million in EBITDA with proven business models, attractive growth and profitability trends, and strong leadership. For more information, please visit www.southfieldcapital.com.