Insignia Capital acquired a stake in MediaAlpha, a marketing technology company, valuing it at $350m. As a result of the transaction, White Mountains Insurance Group, a financial services holding company based in Hamilton, Bermuda, will retain an equity stake in MediaAlpha. White Mountains expects to receive net cash proceeds of approximately $85m from the transaction. “This transaction is an important milestone for MediaAlpha. It recognizes the significant value that the MediaAlpha team have created to date, and it sets the stage for further value creation going forward,” said Manning Rountree, Chief Executive Officer of White Mountains. “We are excited to welcome Insignia Capital as our new institutional investment partner. The Insignia team has a proven track record of investing in high-growth marketing technology businesses, and their strategic and operational guidance will be highly valuable.”