This paper examines an innovation in capital formation that has spurred contentious debate: the Umbrella Partnership Corporation (“Up-C”) IPO. Advisors and underwriters argue that the Up-C deal structure is a driver of post-IPO value and, thus, is a value-enhancing means of raising capital that may be one solution to concerns regarding the drop in the number of publicly traded companies. Consistent with these claims, recent research suggests that organizing soon-to-be public businesses as pass-through entities (as is the case for Up-Cs) leads to superior future performance. Yet, broadening the analysis to consider abnormal stock performance and post-IPO litigation of a larger and more recent sample of exclusively Up-C IPOs, we conclude just the opposite. While the Up-C deal structure increases IPO valuations and predicts positive post-IPO operating performance, the return performance of Up-C IPOs indicates that Up-C deals harm public shareholders. Further, despite their superior earnings performance, Up-C IPOs face a significantly higher rate of post-IPO litigation as compared with non-Up-C IPOs. Because IPO investors seemingly do not anticipate the myriad ways in which the Up-C deal structure might facilitate opportunism by pre-IPO owners, they frequently turn to litigation as an ex-post settling-up mechanism. Consequently, our paper offers the first empirical evidence of downsides associated with the Up-C deal structure for public shareholders and, in so doing, affords the rarity of having academic evidence lead (as opposed to respond to) a controversial debate. This paper was This paper was accepted by Victoria Ivashina, finance. Funding: The authors gratefully acknowledge the financial support of the NYU Stern School of Business, the J. Reuben Clark Law School, and the Marriott School of Business. Supplemental Material: Data are available at https://doi.org/10.1287/mnsc.2022.4454 .