Company: FTCI
Filing Date: 2025-05-22
Form Type: 424B5
Source: 0001193125-25-125092
Chunk: 2

Company: FTC Solar, Inc.
Filing Date: 2025-05-22
Form: 424B5
Chunk 2
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 to the contrary is a criminal offense.

H.C. Wainwright & Co.

The date of this prospectus supplement is May 22, 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 on Form S-3 (File No. 333-286887) utilizing a shelf registration process
relating to the securities described in this prospectus supplement was filed with the SEC on May 1, 2025 and was declared effective on May 22, 2025.

This document is in two parts. The first part is this prospectus supplement, which describes the specific terms of this offering of common
stock. The second part is the accompanying base prospectus, which provides more general information, some of which may not apply to this offering. The information included or incorporated by reference in this prospectus supplement also adds to,
updates and changes information contained or incorporated by reference in the accompanying base prospectus. It is also important for you to read and consider all information contained in this prospectus supplement and the accompanying base
prospectus, including the documents we have referred you to in the section entitled “Where You Can Find More Information” below in this prospectus supplement