Company: RAIN
Filing Date: 2025-08-22
Form Type: 424B3
Source: 0001213900-25-079951
Chunk: 1

Company: Rain Enhancement Technologies Holdco, Inc.
Filing Date: 2025-08-22
Form: 424B3
Chunk 1
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 securities laws, and, as such, may elect to comply with certain reduced public company reporting requirements for this and future filings.

INVESTING IN OUR SECURITIES INVOLVES RISKS. YOU SHOULD CAREFULLY CONSIDER THE RISK FACTORS SET FORTH UNDER THE SECTION ENTITLED “RISK FACTORS” ON PAGE 12 OF THE PROSPECTUS, BEFORE MAKING ANY DECISION WHETHER TO INVEST IN OUR SECURITIES.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this Supplement or the accompanying Prospectus. Any representation to the contrary is a criminal offense.

<div align='center'>The date of this prospectus supplement is August 22, 2025.

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported):
August 19, 2025

RAIN ENHANCEMENT TECHNOLOGIES HOLDCO, INC.

(Exact name of registrant as specified in its charter)</div>

| Massachusetts                |     | 001-42460               |     | 99-3527155         |
| (State or other jurisdiction 
 of incorporation)            |     | -Commission File Number |     | -IRS Employer      
 Identification No. |

<div align='center'>4851 Tamiami Trail N, Suite 200

Naples, FL 34103

(Address of principal executive offices, including
zip code)

Registrant’s telephone number, including
area code: 339-222-6714

(Former name or former address, if changed since
last report)</div>

Check the appropriate box below if the Form 8-K
filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

| ☐ | Written communications pursuant to Rule 425 under the Securities 
 Act (17 CFR 230.425)                                             |

| ☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange 
 Act (17 CFR 240.14a-12)                                        |

| ☐ | Pre-commencement communications pursuant to Rule 14d-2(b) 
 under the Exchange Act (17 CFR 240.14d-2(b))