Company: FTCI
Filing Date: 2025-05-22
Form Type: 424B5
Source: 0001193125-25-125092
Chunk: 26

Company: FTC Solar, Inc.
Filing Date: 2025-05-22
Form: 424B5
Chunk 26
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 To the extent that we raise additional capital through the sale of equity or convertible debt securities, the issuance of these securities could result in further dilution to our stockholders. S-15

The above discussion and table are based on 13,068,309 shares of common stock issued and outstanding as of March 31, 2025 and exclude the following:

| • |     | 1,770,510 shares of common stock reserved for future grant or issuance under our 2021 Stock Incentive Plan and    
 613,022 shares of common stock reserved for future grant or issuance under our 2021 Employee Stock Purchase Plan; |

| • |     | 206,405 shares of common stock issuable upon exercise or vesting of options, having a weighted average exercise                               
 price of $20.87 per share (with 189,530 of such options being exercisable, having a weighted average exercise price of $22.13 per share); and |

| • |     | 1,593,926 shares of common stock issuable upon vesting of restricted stock units, having an estimated grant date 
 fair value of $4.91 per share.                                                                                   |

S-16

DESCRIPTION OF THE SECURITIES THAT WE ARE OFFERING

We are offering up to 3,354,947 shares of common stock at an assumed offering price of $4.10 per share, which was the closing price of our
common stock on Nasdaq on May 14, 2025, for aggregate gross proceeds of $13,755,287. The following description of our shares of common stock summarizes the material terms and provisions thereof.

Common Stock

For a description of the
rights associated with the common stock, see “Description of Capital Stock” in the accompanying base prospectus. Our common stock is listed on the Nasdaq Capital Market under the symbol “FTCI.” The transfer agent for the
common stock is Continental Stock Transfer & Trust.

S-17

PLAN OF DISTRIBUTION

We have entered into the Sales Agreement, dated as of May 1, 2025, under which we may offer and sell shares of our common stock from time to
time through Wainwright as the sales agent. Pursuant to this prospectus supplement and the accompanying base prospectus, from time to time we may offer and sell shares of our common stock having an aggregate gross sales price of up to $13,755,287.

The Sales Agreement provides that sales of our common stock, if any, under