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Exhibit 3.1

Registrar of Companies

Government Administration Building

133 Elgin Avenue

George Town

Grand Cayman

SilverBox Corp IV (ROC #408987) (the “Company”)

TAKE NOTICE that by minutes of an extraordinary general meeting of the Company held on 11 August 2026, the following special resolutions were passed:

Proposal No. 1 – The Extension Amendment Proposal

RESOLVED, as a special resolution, that, effective immediately, the Amended and Restated Memorandum and Articles of Association be amended by:

“In the event that the Company does not consummate a Business Combination within 24 months from the consummation of the IPO (the “Deadline Date”), or such later time as the Members may approve in accordance with the Articles; or:”

and replacing it with the following:

“In the event that the Company does not consummate a Business Combination by April 15, 2027 (the “Deadline Date”), or such later time as the Members may approve in accordance with the Articles, or:”

Proposal No. 2 – The Redemption Limitation Amendment Proposal

RESOLVED, as a special resolution, that, effective immediately, the Amended and Restated Memorandum and Articles of Association be amended by:

“provide Members with the opportunity to have their Shares repurchased by means of a tender offer for a per-Share repurchase price payable in cash, equal to the aggregate amount then on deposit in the Trust Account, calculated as of two business days prior to the consummation of such Business Combination, including interest earned on the Trust Account (net of taxes paid or payable, if any), divided by the number of then issued Public Shares, provided that the Company shall not repurchase Public Shares in an amount that would cause the Company’s net tangible assets to be less than US$5,000,001 following such repurchases.”

and replacing it with the following:

“provide Members with the opportunity to have their Shares repurchased by means of a tender offer for a per-Share repurchase price payable in cash, equal to the aggregate amount then on deposit in the Trust Account, calculated as of two business days prior to the consummation of such Business Combination, including interest earned on the Trust Account (net of taxes paid or payable, if any), divided by the number of then issued Public Shares.”

“At a general meeting called for the purposes of approving a Business Combination pursuant to this Article, in the event that such Business Combination is approved by Ordinary Resolution, the Company shall be authorised to consummate such Business Combination, provided that the Company shall not consummate such Business Combination unless the Company has net tangible assets of at least US$5,000,001 immediately prior to, or upon such consummation of, or any greater

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net tangible asset or cash requirement that may be contained in the agreement relating to, such Business Combination.”

and replacing it with the following:

“At a general meeting called for the purposes of approving a Business Combination pursuant to this Article, in the event that such Business Combination is approved by Ordinary Resolution, the Company shall be authorised to consummate such Business Combination.”

“Any Member holding Public Shares who is not the Sponsor, a Founder, Officer or Director may, at least two business days’ prior to any vote on a Business Combination, elect to have their Public Shares redeemed for cash, in accordance with any applicable requirements provided for in the related proxy materials (the “Business Combination Redemption”), provided that no such Member acting together with any Affiliate of their or any other person with whom they are acting in concert or as a partnership, limited partnership, syndicate, or other group (including, for the avoidance of doubt, a “group” (as defined under Section 13 of the Exchange Act) for the purposes of acquiring, holding, or disposing of Shares may exercise this redemption right with respect to more than 15% of the Public Shares in the aggregate without the prior consent of the Company and provided further that any beneficial holder of Public Shares on whose behalf a redemption right is being exercised must identify itself to the Company in connection with any redemption election in order to validly redeem such Public Shares. If so demanded, the Company shall pay any such redeeming Member, regardless of whether they are voting for or against such proposed Business Combination, a per-Share redemption price payable in cash, equal to the aggregate amount then on deposit in the Trust Account calculated as of two business days prior to the consummation of the Business Combination, including interest earned on the Trust Account (such interest shall be net of taxes payable) and not previously released to the Company to pay its taxes, divided by the number of then issued Public Shares (such redemption price being referred to herein as the “Redemption Price”), but only in the event that the applicable proposed Business Combination is approved and in connection with its consummation. The Company shall not redeem Public Shares that would cause the Company’s net tangible assets to be less than US$5,000,001 following such redemptions (the “Redemption Limitation”).

and replacing it with the following:

“Any Member holding Public Shares who is not the Sponsor, a Founder, Officer or Director may, at least two business days’ prior to any vote on a Business Combination, elect to have their Public Shares redeemed for cash, in accordance with any applicable requirements provided for in the related proxy materials (the “Business Combination Redemption”), provided that no such Member acting together with any Affiliate of their or any other person with whom they are acting in concert or as a partnership, limited partnership, syndicate, or other group (including, for the avoidance of doubt, a “group” (as defined under Section 13 of the Exchange Act) for the purposes of acquiring, holding, or disposing of Shares may exercise this redemption right with respect to more than 15% of the Public Shares in the aggregate without the prior consent of the Company and provided further that any beneficial holder of Public Shares on whose behalf a redemption right is being exercised must identify itself to the Company in connection with any redemption election in order to validly redeem such Public Shares. If so demanded, the Company shall pay any such redeeming Member, regardless of whether they are voting for or against such proposed Business Combination, a per-Share redemption price payable in cash, equal to the aggregate amount then on deposit in the Trust Account calculated as of two business days prior to the consummation of the Business Combination, including interest earned on the Trust Account (such interest shall be net of taxes payable) and not previously released to the Company to pay its taxes, divided by the number of then issued Public Shares (such redemption price being referred to herein as the

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“Redemption Price”), but only in the event that the applicable proposed Business Combination is approved and in connection with its consummation.”

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