Operational due diligence is an important part of the investment process. Investors are concerned not only with a manager’s performance but also with the security and stability of its operations. At the recent Third Party Marketers Association (3PM) 2016 Annual Conference, marketers and operational due diligence professionals offered insights into the types of operational due diligence they conduct and how hedge fund managers can prepare for due diligence inquiries. Although the presentation was geared toward third-party marketers, its lessons apply equally to investors because the process by which a third-party marketer investigates a potential client is analogous to how an investor evaluates a hedge fund manager with which it is considering investing. Introduced by Steven Jafarzadeh and moderated by Mark Sullivan, both managing directors and partners at alternative asset placement agent platform Stonehaven, LLC, the program featured Lauri Martin Haas, founder and principal of operational due diligence firm PRISM LLC, and Kenneth S. Springer, founder and president of business investigations firm Corporate Resolutions Inc. This article highlights the key takeaways from the panel. For coverage of another 3PM annual conference, see “Third Party Marketers Association 2011 Annual Conference Focuses on Hedge Fund Capital Raising Strategies, Manager Due Diligence, Structuring Hedge Fund Marketer Compensation and Marketing Regulation” (Dec. 1, 2011). For additional insight from Springer, see “Can Hedge Fund Managers Use Whistleblower Hotlines to Help Create and Demonstrate a Culture of Compliance?” (Jul. 23, 2010); and “Implications for Hedge Funds of New Whistleblower Initiatives by FINRA and the SEC: An Interview With Kenneth Springer of Corporate Resolutions Inc.” (Mar. 11, 2009).