Company: FTCI
Filing Date: 2025-05-01
Form Type: S-3
Source: 0001193125-25-109056
Chunk: 38

Company: FTC Solar, Inc.
Filing Date: 2025-05-01
Form: S-3
Chunk 38
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12-month period so long as our public float remains below $75 million. During the 12 calendar months prior to and including the date of this prospectus supplement (excluding this offering), we have sold
approximately $0 of securities pursuant to General Instruction I.B.6 of Form S-3.

Investing in our shares of common stock involves a high degree of risk. Before making any investment decision, you should carefully review and consider all the information in this prospectus supplement, the accompanying base prospectus and the documents incorporated by reference herein and therein, including the risks and uncertainties described under “ Risk Factors” beginning on page S-10of this prospectus supplement and the risk factors incorporated by reference into this prospectus supplement and the accompanying base prospectus.

Neither the U.S. Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of these shares or determined if this prospectus supplement or the accompanying base prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

H.C. Wainwright & Co.

The date of this prospectus supplement is , 2025.

TABLE OF CONTENTS

|                                                           |     | Page |       |
| PROSPECTUS SUPPLEMENT                                     |     |      |       |
| ABOUT THIS PROSPECTUS SUPPLEMENT                          |     |      | S-ii  |
| CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS |     |      | S-iii |
| PROSPECTUS SUPPLEMENT SUMMARY                             |     |      | S-1   |
| THE OFFERING                                              |     |      | S-9   |
| RISK FACTORS                                              |     |      | S-10  |
| USE OF PROCEEDS                                           |     |      | S-14  |
| DILUTION                                                  |     |      | S-15  |
| DESCRIPTION OF THE SECURITIES THAT WE ARE OFFERING        |     |      | S-17  |
| PLAN OF DISTRIBUTION                                      |     |      | S-18  |
| LEGAL MATTERS                                             |     |      | S-20  |
| EXPERTS                                                   |     |      | S-20  |
| WHERE YOU CAN FIND MORE INFORMATION                       |     |      | S-21  |
| INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE           |     |      | S-22  |

S-i

ABOUT THIS PROSPECTUS SUPPLEMENT

A registration statement