Company: APXT
Filing Date: 2025-10-07
Form Type: S-1/A
Source: 0001213900-25-097069
Chunk: 380

Company: Apex Treasury Corp
Filing Date: 2025-10-07
Form: S-1/A
Chunk 380
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 undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser: (i)any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424; (ii)any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by an undersigned registrant; (iii)the portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and (iv)any other communication that is an offer in the offering made by the undersigned registrant to the purchaser. II-4

SIGNATURES Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Vero Beach, Florida, on the 7 thday of October, 2025.

| APEX TREASURY CORPORATION |     |                            |
| By:                       |     | /s/ Hugh Cochrane          |
| Name:                     |     | Hugh Cochrane              |
| Title:                    |     | Co-Chief Executive Officer |

POWER OF ATTORNEY Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities indicated on October 7, 2025.

| Name              |     | Position                                                      |
| /s/ Ajmal Rahman  |     | Co-Chief Executive Officer and Chairman                       |
| Ajmal Rahman      |     | -Co-Principal Executive Officer                               |
| /s/ Hugh Cochrane |     | Co-Chief Executive Officer and Director                       |
| Hugh Cochrane     |     | -Co-Principal Executive Officer                               |
| /s/ Paul Sykes    |     | Chief Financial Officer                                       |
| Paul Sykes        |     | -Principal Financial Officer and Principal Accounting Officer |

II-5

AUTHORIZED REPRESENTATIVE IN THE UNITED STATES Pursuant to the requirements of Section 6(a) of the Securities Act of 1933, the undersigned has signed this registration statement, solely in its capacity as the duly authorized representative of Apex Treasury Corporation in Vero Beach, Florida, on the 7 thday of October, 2025.

| APE