List: Top Private Companies

Re-ranked by oldest company: 1. FM Global | Year founded: 1835 2 (tie). Butler Hospital | Year founded: 1844 2 (tie). Nixon Peabody LLP | Year founded: 1844 The complete list is available for purchase online. For information about participating in PBN’s Top Lists, or to make additions or corrections, call (401) 680-4838 or write

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