Company: FTCI
Filing Date: 2025-05-01
Form Type: 424B5
Source: 0001193125-25-109046
Chunk: 1

Company: FTC Solar, Inc.
Filing Date: 2025-05-01
Form: 424B5
Chunk 1
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writer” within the meaning of the Securities Act and the compensation of the Manager will be deemed to be
underwriting commissions or discounts. We have also agreed to provide indemnification and contribution to the Manager with respect to certain liabilities, including liabilities under the Securities Act. See the section titled “Plan of Distribution” on page S-18 of this prospectus supplement.

We will pay all of the
expenses incident to the registration, offering and sale of the shares of common stock under this prospectus supplement and the accompanying base prospectus.

Our common stock is listed and trades on the Nasdaq Capital Market under the symbol “FTCI.” The last sale price of our shares of
common stock on April 29, 2025 was $3.42 per share.

As of the date of this prospectus supplement, the aggregate market value of our
outstanding 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 April 29, 2025, which was $3.42 per share, was
$11,350,576, based on 9,966,612 shares of our outstanding common stock as of the date of this prospectus supplement, of which 6,861,675 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-10 of 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