X0407 4 2023-05-30 0 0001724979 Rain Oncology Inc. RAIN 0001178579 TANG KEVIN C 4747 EXECUTIVE DRIVE, SUITE 210 SAN DIEGO CA 92121 0 0 1 0 0001232621 TANG CAPITAL MANAGEMENT LLC 4747 EXECUTIVE DRIVE SUITE 210 SAN DIEGO CA 92121 0 0 1 0 0001191935 TANG CAPITAL PARTNERS LP 4747 EXECUTIVE DRIVE SUITE 210 SAN DIEGO CA 92121 0 0 1 0 0 Common Stock 2023-05-30 4 P 0 347932 1.05 A 3000000 I By LP Common Stock 2023-05-30 4 P 0 200000 1.00 A 3200000 I By LP Common Stock 2023-05-30 4 P 0 32890 1.06 A 3232890 I By LP Common Stock 2023-05-30 4 P 0 2016 1.08 A 3234906 I By LP Common Stock 2023-05-30 4 P 0 5930 1.06 A 3240836 I By LP Common Stock 2023-05-31 4 P 0 161180 1.08 A 3402016 I By LP Common Stock 2023-05-31 4 P 0 5000 1.10 A 3407016 I By LP Common Stock 2023-06-01 4 P 0 92984 1.09 A 3500000 I By LP Common Stock 2023-06-01 4 P 0 240341 1.12 A 3740341 I By LP The prices reported are weighted-average prices. These shares were purchased in multiple transactions at prices ranging from $0.96 to $1.15. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the SEC staff, upon request, all information regarding the number of shares purchased at each price within the ranges set forth in Footnote 1, and Footnotes 3 through 10 herein. The shares are beneficially owned by Tang Capital Partners, LP ("TCP"). Kevin Tang is the sole manager of Tang Capital Management, LLC ("TCM"), which is the general partner of TCP. Mr. Tang has a pecuniary interest in the shares beneficially held by TCP. These shares were purchased in multiple transactions ranging from $0.96 to $1.03. These shares were purchased in multiple transactions ranging from $1.05 to $1.08. These shares were purchased in multiple transactions ranging from $1.075 to $1.08. These shares were purchased in multiple transactions ranging from $1.02 to $1.08. These shares were purchased in multiple transactions ranging from $1.04 to $1.10. These shares were purchased in one transaction at $1.10. These shares were purchased in multiple transactions ranging from $1.04 to $1.11. These shares were purchased in multiple transactions ranging from $1.10 to $1.12. Kevin Tang 2023-06-01 Kevin Tang, Manager 2023-06-01 Kevin Tang, Manager of Tang Capital Management, LLC, General Partner 2023-06-01