Company: FTCI
Filing Date: 2025-05-01
Form Type: S-3
Source: 0001193125-25-109056
Chunk: 53

Company: FTC Solar, Inc.
Filing Date: 2025-05-01
Form: S-3
Chunk 53
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 of up to $11,350,576. |

| Common Stock Outstanding Before This Offering | 13,071,548 shares. |

| Common Stock to be Outstanding After This Offering | 16,390,430 shares, assuming sales at a price of $3.42 per share, which was the closing price of our common stock on Nasdaq on April 29, 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 12,853,823 shares of common stock issued and outstanding as of December 31, 2024 and exclude the following:

| • |     | 1,799,715 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; |

| • |     | 219,653 shares of common stock issuable upon exercise or vesting of options, having a weighted average                                                 
 exercise price of $19.73 per share (with 196,465 of such options being exercisable, having a weighted average exercise price of $21.27 per share); and |

| • |     | 1,566,439 shares of common stock issuable upon vesting of restricted stock units, having an estimated grant 
 date fair value of $5.70 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,