Company: FTCI
Filing Date: 2025-06-20
Form Type: S-8
Source: 0001193125-25-143249
Chunk: 0

Company: FTC Solar, Inc.
Filing Date: 2025-06-20
Form: S-8
Chunk 0
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As filed with the Securities and Exchange Commission on June 20, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 FTC SOLAR, INC. (Exact name of registrant as specified in its charter)

| Delaware                        |     | 81-4816270         |
| (State or other jurisdiction of 
 incorporation or organization)  |     | -I.R.S. Employer   
 Identification No. |

9020 N Capital of Texas Hwy, Suite I-260, Austin, Texas 78759 (Address of Principal Executive Offices, Including Zip Code) FTC Solar, Inc. 2021 Stock Incentive Plan (Full Title of the Plan) Cathy Behnen Chief Financial Officer FTC Solar, Inc. 9020 N Capital of Texas Hwy, Suite I-260, Austin, Texas 78759 (737) 787-7906 (Name, Address, Including Zip Code, and Telephone Number, Including Area Code, of Agent for Service) Copies of communications to:

| Michael Penney, Esq.             |     | Cathy Behnen                              |
| Arnold & Porter Kaye Scholer LLP |     | Chief Financial Officer                   |
| 250 West 55th Street             |     | FTC Solar, Inc.                           |
| New York, New York 10019         |     | 9020 N Capital of Texas Hwy, Suite I-260, |
| (212) 836-8000                   |     | Austin, Texas 78759                       |
|                                  |     | (737) 787-7906                            |

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-acceleratedfiler, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2of the Exchange Act.

| Large accelerated filer |     | ☐ |     | Accelerated filer         |     | ☐ |
| Non-accelerated filer   |     | ☒ |     | Smaller reporting company |     | ☒ |
| Emerging growth company |     | ☒ |     |                           |     |   |

If an emerging growth company, indicate by check mark if the