Company: FTCI
Filing Date: 2025-05-16
Form Type: S-3/A
Source: 0001193125-25-121719
Chunk: 36

Company: FTC Solar, Inc.
Filing Date: 2025-05-16
Form: S-3/A
Chunk 36
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 SEC after the date of the initial registration statement and prior to the effectiveness of the registration statement, shall be deemed to be incorporated herein by reference. We are not, however, incorporating by reference any documents or portions thereof that are not deemed “filed” with the SEC, including any information furnished pursuant to Items 2.02 or 7.01 of Form 8-K. We will provide without charge to each person, including any beneficial owner, to whom a copy of this prospectus is delivered, upon written or oral request of such person, a copy of any or all of the documents referred to above which have been incorporated by reference in this prospectus but not delivered with this prospectus. You should direct requests for those documents to FTC Solar, Inc., 9020 N Capital of Texas Hwy, Suite I-260,Austin, Texas 78759, Attention: Bill Michalek (telephone: (737) 787-7906).Exhibits to any documents incorporated by reference in this prospectus will not be sent, however, unless those exhibits have specifically been incorporated by reference into such documents. 27

THE INFORMATION IN THIS PROSPECTUS SUPPLEMENT IS NOT COMPLETE AND MAY BE CHANGED. WE MAY NOT SELL THESE SECURITIES OR ACCEPT AN OFFER TO BUY THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS SUPPLEMENT IS NOT AN OFFER TO SELL THESE SECURITIES AND IT IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

SUBJECT TO COMPLETION, DATED MAY 16, 2025

PROSPECTUS SUPPLEMENT

(To Prospectus dated
, 2025)

FTC SOLAR, INC.

Up to $13,755,287

Common Stock

We have entered into an At the Market Offering Agreement dated as of May 1, 2025 (the “Sales Agreement”) with H.C.
Wainwright & Co., LLC (the “Manager” or “Wainwright”), relating to the sale of shares of our common stock, $0.0001 par value per share (the “common stock”). In accordance with the terms of the Sales Agreement,
from time to time we may offer and sell shares of our common stock through the Manager acting as sales agent and/or principal. Pursuant to this prospectus supplement