Company: SBXD
Filing Date: 2025-08-07
Form Type: 425
Source: 0001104659-25-074863
Chunk: 12

Company: SilverBox Corp IV
Filing Date: 2025-08-07
Form: 425
Chunk 12
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 and existing contractual rights.

The Sponsor Support Agreement is filed as Exhibit 10.1 to this Current Report on Form 8-K, and the foregoing description thereof is qualified in its entirety by reference to the full text of the Sponsor Support Agreement and the terms of which are incorporated by reference herein.

Sponsor Letter Agreement

Contemporaneously with the
execution of the Business Combination Agreement, SPAC entered into a Sponsor Letter Agreement with Sponsor and Pubco (the “Sponsor Letter Agreement”), pursuant to which, among other things, the Sponsor will deposit up to 150,000 Sponsor Earnout Shares into
an escrow account, such shares to be released from escrow in accordance with the following:

| · | Two-thirds (2/3) of the Sponsor Earnout Shares will be released if the VWAP of the Pubco Class A Stock                             
 equals or exceeds $12.50 per share for any 20 trading days within any consecutive 30-trading day period during the Earnout Period. |

| · | One-third (1/3) of the Sponsor Earnout Shares will be released if the VWAP of the Pubco Class A Stock                              
 equals or exceeds $15.00 per share for any 20 trading days within any consecutive 30-trading day period during the Earnout Period. |

All of the Sponsor Earnout
Shares will be accelerated and released if Pubco is subject to a Qualified Change of Control.

In addition, the Sponsor will
use its commercially reasonable efforts to facilitate SPAC, the Company and/or Pubco or their respective subsidiaries entering into Additional
Financing Transactions as contemplated by the Business Combination Agreement.

The Sponsor Letter Agreement is filed as Exhibit 10.2 to this Current Report on Form 8-K, and the foregoing description thereof is qualified in its entirety by reference to the full text of the Sponsor Letter Agreement and the terms of which are incorporated by reference herein.

Lock-Up Agreements

Concurrently with the
Closing, certain significant Company Holders (the “Significant Company Holders”) will enter into a Lock-Up
Agreement (collectively, the “Lock-Up Agreements”) with Pubco and SPAC Representative, pursuant to which the
Significant Company Holders will agree that the shares of Pubco Class A Stock received by each Significant Company Holder will be
locked up and subject to transfer restrictions, as described below, subject to certain exceptions. The shares of Pubco Class A Stock
held by each Significant Company Holder will be locked up until the earlier of (i