Company: RAIN
Filing Date: 2025-08-14
Form Type: 424B3
Source: 0001213900-25-076764
Chunk: 1

Company: Rain Enhancement Technologies Holdco, Inc.
Filing Date: 2025-08-14
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 14, 2025.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2025

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 001-42460

RAIN ENHANCEMENT TECHNOLOGIES HOLDCO, INC.

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

| Massachusetts                   |     | 99-3527155         |
| (State or other jurisdiction of 
 incorporation or organization)  |     | -IRS Employer      
 Identification No. |

| 4851 Tamiami Trail N, Suite 200          
 Naples, FL                               |     |     34103 |
| (Address of Principal Executive Offices) |     | -Zip Code |

<div align='center'>339-222-6714

Registrant’s telephone number, including area code</div>

Securities registered pursuant to Section 12(b)
of the Act:

| Title of each class                                                                                                      |     | Trading Symbol(s) |     | Name of each exchange on which registered |
| Class A common stock, par value $0.0001 per share                                                                        |     | RAIN              |     | The Nasdaq Stock Market LLC               |
| Redeemable warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50