Company: FTCI
Filing Date: 2025-05-16
Form Type: S-3/A
Source: 0001193125-25-121719
Chunk: 38

Company: FTC Solar, Inc.
Filing Date: 2025-05-16
Form: S-3/A
Chunk 38
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 common stock held by non-affiliates, computed by reference to the price at which our common stock was last sold on the Nasdaq Capital Market on May 14, 2025, which was $4.10 per share, was
$41,265,860, based on 13,083,998 shares of our outstanding common stock as of the date of this prospectus supplement, of which 10,064,844 shares were held by non-affiliates. Pursuant to General Instruction
I.B.6 of Form S-3, in no event will we sell securities in a public primary offering with a value exceeding one-third of our public float in any 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 May 12, 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  |
| DIL