Nationale borg is a member of Liberty Mutual Insurance. In 2019 Nationale Borg became part of Liberty Mutual Surety, a unit w ... ithin Liberty Mutual Insurance, allowing companies outside the Netherlands and Belgium to also ge acquainted with our product: guarantees that are not simply based on blocked funds but on trust in your business. Liberty Mutual Surety is the largest surety in the United States and a leading global surety. With underwriting offices in more than 15 countries and bonds issued throughout the world, Liberty Mutual Surety has the ability, experience and resources to underwrite all types of contractors and corporations for local, regional, national and multinational customers. In business since 1912, and headquarterred in Boston, Massachusetts, Liberty Mutual is the fifth largest global property and casualty insurer based on 2018 gross written premium and ranks 75th on the Fortune 100 list of largest corporations in the United States based on 2018 revenue. As of December 31, 2018, Liberty Mutual had $ 41.6 billion in annual consolidated revenue. read more