CarGurus Ireland Limited, an Irish Private Company Limited by Shares CarGurus UK Limited, a U.K. Private Limited Company CarGurus Securities Corp., a Massachusetts corporation CGSC, Inc., a Massachusetts corporation

Exhibit 21.1

CarGurus Ireland Limited, an Irish Private Company Limited by Shares

CarGurus UK Limited, a U.K. Private Limited Company

CarGurus Securities Corp., a Massachusetts corporation

CGSC, Inc., a Massachusetts corporation