Strikingly absent from the entire corporate governance and corporate litigation debate is a unique feature of American civil procedure that deserves special attention: the modern civil discovery regime. This Article attempts to fill this gap. We argue that modern discovery — first established by the Federal Rules of Civil Procedure in 1938 — has had a profound impact on the evolution of shareholder litigation, corporate governance, and the culture of corporate disclosure in the United States. This Article shows that (1) litigation discovery, and its threat, have driven and structured the process of corporate shareholder litigation; (2) the information generated by discovery has stimulated the development of case law defining shareholder rights and managerial duties; (3) the episodic legal demands for detailed corporate internal information (and the threat of discovery) have induced incremental improvements in corporate governance practices, including more exacting decision procedures, internal monitoring, recordkeeping, and disclosure; (4) highly developed, continuously evolving discovery practices have established templates for independent corporate internal investigations by boards and regulators; and (5) discovery has given regulators steady insight into changing corporate internal practices and patterns of wrongdoing to which regulators have responded with broad legal and regulatory changes. This Article concludes that litigation discovery serves, inter alia, as a form of ex post disclosure, which complements and enforces ex ante disclosure under the federal securities laws. These observations have important normative implications for legal transplants and the enforcement debate. Among other things, this Article cautions against legal transplants of U.S.-style securities disclosure, aggregate litigation mechanisms, and other enforcement mechanisms without considering appropriate tools for investigating corporate internal wrongdoing ex post, and points to problems in the empirical literature on U.S. shareholder litigation outcomes. It also questions current proposed reforms to the federal discovery rules.