Amendment: SEC Form SCHEDULE 13D/A filed by Coliseum Acquisition Corp.

Item 4 is hereby amended and supplemented as follows: On December 14, 2024, Mr. You transferred by gift for no consideration to unaffiliated third parties an aggregate of 1,550,000 Class A Shares.

Item 5 is hereby amended and restated in its entirety as follows: The information set forth in the facing pages of this Schedule 13D with respect to the beneficial ownership of the Reporting Person is incorporated by reference into this Item 5. The aggregate number of Class A Shares owned by the Reporting Person is 1,075,000 shares, which includes one Class A Share issuable upon the conversion of one Class B Share held by the Reporting Person which may be converted at any time and from time to time at the option of the Reporting Person. Such amount excludes 2,257,500 Class A Shares issuable upon the exercise of 2,257,500 warrants of the Issuer, which are beneficially owned by the Reporting Person, because such warrants may be exchanged for shares of Rain Enhancement Technologies Holdco, Inc. ("Holdco"), subject to the completion of the Issuer's initial business combination with Holdco and the other terms of the Warrant Exchange Agreement described in Item 6 to this Amendment.

The Reporting Person has sole voting and dispositive power over the Class A Shares reported in this Schedule 13D.

Except for the transactions described in Item 4 and 6 of this Schedule 13D, the Reporting Person has not engaged in any transaction during the past 60 days involving the ordinary shares of the Issuer.

To the best knowledge of the Reporting Person, no one other than the Reporting Person, or the affiliates of the Reporting Person, is known to have the right to receive, or the power to direct the receipt of, dividends from, or proceeds from the sale of, the Class A Shares reported herein as beneficially owned by the Reporting Person.

Not applicable.

Item 6 is hereby amended and supplemented as follows: Private Placement Warrant Exchange On December 17, 2024, in connection with the proposed business combination among the Issuer, Rain Enhancement Technologies, Inc. ("RET"), Holdco, Rainwater Merger Sub 1, Inc. and Rainwater Merger Sub 2A, Inc. (the "Business Combination"), the Issuer and Holdco entered into an agreement (the "Warrant Exchange Agreement") with the holders of warrants issued by the Issuer in a private placement prior to its initial public offering (the "Private Placement Warrants"), which includes Berto LLC, a limited liability company the sole member of which is Harry You ("Berto"). Pursuant to the Warrant Exchange Agreement, Berto agreed to exchange, at the closing of the Business Combination, all 2,257,500 Private Placement Warrants held by it for shares of Class A common stock of Holdco, par value $0.0001 per share ("Holdco Class A Common Stock"), at an exchange ratio of 0.25 shares of Holdco Class A Common Stock per Private Placement Warrant (the "Warrant Exchange"). Prior to the Warrant Exchange, such warrants Private Placement Warrants pursuant to their terms were exercisable for the Issuer's Class A Shares at an initial exercise price of $11.50 per share beginning 30 days after the closing of the Business Combination. Accordingly, as a result of the Warrant Exchange, Holdco will issue to Berto 564,375 shares of Holdco Class A Common Stock at the closing of the Business Combination and such Private Placement Warrants will be cancelled and no longer outstanding. The shares issued in connection with the Warrant Exchange will be subject to a two-year lockup following the closing of the Business Combination. Subscription Agreement On December 23, 2024, in connection with the Business Combination, an affiliate of the Reporting Person entered into a subscription agreement with Holdco pursuant to which such affiliate agreed, subject to the closing of the Business Combination and the other terms of such subscription agreement, to purchase in a private placement $500,000 of shares of Holdco Class A Common Stock at a price per share equal to the redemption price for the Issuer's Class A Shares in the Business Combination.

Exhibit 3 - Warrant Exchange Agreement, dated December 17, 2024 (incorporated by reference to Exhibit 10.1 to the Issuer's Current Report on Form 8-K filed with the Securities and Exchange Commission on December 18, 2024).