$FTCI Who: South Cone Investments Limited Partnership (10% Owner) === Transaction Date: 2022-12-05 Transaction Code: P (Purchase of securities on an exchange or from another person) Amount: 36859 Price: 2.39 Amount of Securities: 14689609 === Explanation of Responses: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.36 to $2.40 per share, inclusive. The reporting persons undertake to provide FTC Solar, Inc., a Delaware corporation (the Issuer), any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (1) to this Form 4. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.21 to $2.31 per share, inclusive. The reporting persons undertake to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4. South Cone Investments Limited Partnership directly owns 100% of the issued and outstanding membership interest of South Lake One LLC.