Company: FTCI
Filing Date: 2025-05-22
Form Type: 424B5
Source: 0001193125-25-125092
Chunk: 17

Company: FTC Solar, Inc.
Filing Date: 2025-05-22
Form: 424B5
Chunk 17
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 Stock Outstanding Before This Offering | 13,083,998 shares. |

| Common Stock to be Outstanding After This Offering | 16,438,945 shares, assuming sales at a price of $4.10 per share, which was the closing price of our common stock on Nasdaq on May 14, 2025. The actual number of shares issued will vary depending on the sales price under this offering. |

| Plan of Distribution | An “at the market offering” that may be made from time to time through Wainwright as sales agent or principal. See “Plan of Distribution” on page S-18 of this prospectus 
 supplement for more information.                                                                                                                                          |

| Use of Proceeds | We intend to use the net proceeds, if any, from this offering for general corporate purposes, including working capital and operating expenses. We may also use a portion of such proceeds to acquire or invest in businesses, products, services or 
 technologies; however, we do not have binding agreements or commitments for any material acquisitions or investments at this time. See “Use of Proceeds” on page S-14.                                                                               |

| Nasdaq Capital Market Symbol | “FTCI”. |

The above discussion and table are based on 13,083,998 shares of common stock issued and outstanding as of May 15, 2025 and exclude the following:

| • |     | 1,755,220 shares of common stock reserved for future grant or issuance under our 2021 Stock Incentive Plan and    
 613,022 shares of common stock reserved for future grant or issuance under our 2021 Employee Stock Purchase Plan; |

| • |     | 206,405 shares of common stock issuable upon exercise or vesting of options, having a weighted average exercise                               
 price of $20.87 per share (with 189,530 of such options being exercisable, having a weighted average exercise price of $22.13 per share); and |

| • |     | 1,553,993 shares of common stock issuable upon vesting of restricted stock units, having an estimated grant date 
 fair value of $4.36 per share.                                                                                   |

S-9

RISK FACTORS

You should carefully consider the following risk factors and the information discussed under the heading “Risk Factors” and elsewhere in our most recent Annual Report on Form 10-Kand our other periodic reports filed with the SEC, which are incorporated by reference into this prospectus supplement and the accompanying prospectus, as