X0508 4 2023-12-15 0001650648 4D Molecular Therapeutics, Inc. FDMT 0001834021 Kirn David C/O 4D MOLECULAR THERAPEUTICS INC. 5858 HORTON STREET #455 EMERYVILLE CA 94608 true true false false Chief Executive Officer true Common Stock 2023-12-15 4 S false 28632 17.2685 D 1230521 D Common Stock 2023-12-18 4 S false 4702 18.129 D 1225819 D Common Stock 2024-01-04 4 S false 40732 20.3084 D 1185087 D Common Stock 2024-01-05 4 S false 28104 19.5632 D 1156983 D Common Stock 2024-01-05 4 S false 133 20.105 D 1156850 D Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on August 17, 2023. The transaction was executed in multiple trades in prices ranging from $17.00 to $17.71, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote. The transaction was executed in multiple trades in prices ranging from $17.77 to $18.525, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote. The transaction was executed in multiple trades in prices ranging from $20.02 to $20.545, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote. The transaction was executed in multiple trades in prices ranging from $19.085 to $20.08, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote. The transaction was executed in multiple trades in prices ranging from $20.09 to $20.11, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote. By: /s/ Scott Bizily as Attorney-in-fact David Kirn 2024-01-08