D&O insurance policies offer liability cover for company managers to protect them from claims which may arise from the decisions and actions taken within the scope of their regular duties. D&O cover was first conceived in the late 19th century, and after a long period of obscurity has spread rapidly throughout the industrialized world since the 1980s. Such policies cover the personal liability of company directors and officers as individuals, reimbursement of the insured company if it pays a claim on behalf of its managers, and cover for securities claims against publicly listed companies. The document discusses why companies purchase D&O insurance, how D&O cover functions in terms of who and what is covered, and developments in the D&O insurance market globally.