Company: FTCI
Filing Date: 2025-08-20
Form Type: DEFA14A
Source: 0001193125-25-184073
Chunk: 0

Company: FTC Solar, Inc.
Filing Date: 2025-08-20
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 
 14a-6(e)(2))                                                       |

| ☐ | Definitive Proxy Statement |

| ☒ | Definitive Additional Materials |

| ☐ | Soliciting Material under §240.14a-12 |

FTC Solar, Inc. (Name of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check all boxes that apply):

| ☒ | No fee required. |

| ☐ | Fee paid previously with preliminary materials |

| ☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 
 14a-6(i)(1) and 0-11                                                           |

YOUR VOTE HAS NOT BEEN RECEIVED! SPECIAL MEETING OF STOCKHOLDERS August 20, 2025 Dear Fellow Stockholder: We are writing to alert you that the FTC Solar, Inc. Special Meeting of Stockholders is quickly approaching. The Special Meeting is scheduled to be held on September 4, 2025. Our records indicate that as of the date of this letter we have not yet received your vote. As set forth in our Proxy Statement, dated July 25, 2025, stockholders are being asked to vote on the following resolutions.

| • |     | Proposal 1: To approve, in accordance with Nasdaq Listing Rule 5635(d), the issuance of an aggregate                                                                                                                           
 6,836,237 shares of our Common Stock, par value $0.0001 per share (the “Common Stock”), issuable upon exercise of certain Warrants to Purchase Common Stock (the “Warrants”), in excess of the exercise caps applicable to the 
 Warrants;                                                                                                                                                                                                                      |

| • |     | Proposal 2: To approve an amendment to our 2021 Stock Incentive Plan (the “2021 Plan”) to 
 reserve an additional 2,000,000 shares of Common Stock for issuance under the 2021 Plan;  |