Company: FTCI
Filing Date: 2025-05-16
Form Type: S-3/A
Source: 0001193125-25-121719
Chunk: 54

Company: FTC Solar, Inc.
Filing Date: 2025-05-16
Form: S-3/A
Chunk 54
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 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 well as the other information included or incorporated by reference into this prospectus supplement and the accompanying prospectus, before making an investment decision. The following is not intended as, and should not be construed as, an exhaustive list of relevant risk factors. There may be other risks that a prospective investor should consider that are relevant to its own particular circumstances or generally.

Risks Related to this Offering

Changes in the U.S. trade environment, including the imposition of import tariffs, could adversely affect the amount or timing of our revenue, results of operations or cash flows.

Trade policies and international disputes at times result in increased tariffs, trade barriers and other restrictive measures. In particular,
China and the United States have imposed and announced significant tariffs on imports of goods from each other’s respective countries in recent years. These developments and any further tariff increases could potentially impact our
suppliers’ hardware component