Company: FTCI
Filing Date: 2025-05-16
Form Type: S-3/A
Source: 0001193125-25-121719
Chunk: 2

Company: FTC Solar, Inc.
Filing Date: 2025-05-16
Form: S-3/A
Chunk 2
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”), the Registrant may issue and sell securities covered by the Prior Registration Statement until the earlier of (i) the effective date of this Registration Statement and (ii) January 3, 2026, which is 180 days after the third-year anniversary of the effective date of the Prior Registration Statement (the “Expiration Date”). In particular, the Registrant may continue to offer and sell under the Prior Registration Statement shares of common stock in its at-the-marketoffering through H.C. Wainwright & Co., LLC, as sales agent, which offering shall remain registered under the Prior Registration Statement using a prospectus supplement filed on May 1, 2025, until the Expiration Date. Pursuant to Rule 415(a)(6) under the Securities Act, the offering of securities under the Prior Registration Statement will be deemed terminated as of the effective date of this registration statement. This registration statement contains two prospectuses:

| • |     | A base prospectus, which covers the offering, issuance and sale by us of up to $65,000,000 in the aggregate of         
 our common stock, preferred stock, debt securities, warrants and/or consisting of some or all of these securities; and |

| • |     | an At the Market Offering Agreement (“Sales Agreement”) prospectus covering the offering, issuance and                                                                                              
 sale by us of up to a maximum aggregate offering price of $13,755,287 of our common stock that may be issued and sold under the sales agreement dated May 1, 2025, with H.C. Wainwright & Co., LLC. |

The base prospectus immediately follows this explanatory note. The specific terms of any securities to be offered pursuant to the base prospectus will be specified in a prospectus supplement to the base prospectus. The Sales Agreement prospectus immediately follows the base prospectus. Upon termination of the Sales Agreement with H.C. Wainwright & Co., LLC, any portion of the $13,755,287 of securities included in the Sales Agreement offering prospectus that remains unsold pursuant to the Sales Agreement will be available for sale in other offerings pursuant to the base prospectus and a corresponding prospectus supplement, and if no shares are sold under the Sales Agreement, the full $13,755,287 of securities not sold may be sold in other offerings pursuant to the base prospectus and a corresponding prospectus supplement.

The information in this prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the