Transaction Details

Footnotes

Represents shares held by BCPE Derby Investor, LP ("Derby Investor") and BCPE Derby (DE) SPV, LP ("Derby SPV Investor"). Bain Capital Investors, LLC ("BCI") is the manager of Bain Capital Partners XI, L.P. ("Partners XI"), which is the general partner of Bain Capital Fund XI, L.P. ("Fund XI"). Fund XI is the (i) sole member of BCPE Derby GP, LLC ("Derby GP"), which is the general partner of Derby Investor and (ii) sole member of BCPE Derby (DE) SPV, LLC ("Derby SPV GP" and, together with BCI, Partners XI, Fund XI, Derby GP, Derby Investor and Derby SPV Investor, the "Bain Capital Entities"), which is the general partner of Derby SPV Investor. | (Continued from footnote 1) Paul G Moskowitz, a member of the board of directors of Waystar Holding Corp. (the "Issuer"), is a Partner of BCI. By virtue of the relationships described in this footnote, Mr. Moskowitz may be deemed to share voting and dispositive power with respect to the shares of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), held by the Bain Capital Entities. Mr. Moskowitz disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein. | Pursuant to a registered public offering that closed on May 16, 2025, 233,925 shares of Common Stock were sold by Derby Investor and 2,778,328 shares of Common Stock were sold by Derby SPV Investor at a price of $37.3937 (net of underwriting discount). | On May 16, 2025, Derby Investor distributed 235,397 shares of Common Stock to one or more of its members or partners in connection with certain charitable gifts made by such members or partners or their direct or indirect owners. | In connection with the exercise of the underwriters' option to purchase additional shares of Common Stock in a registered public offering that closed on May 20, 2025, 65,295 shares of Common Stock were sold by Derby Investor and 386,542 shares of Common Stock were sold by Derby SPV Investor at a price of $37.3937 (net of underwriting discount).