Company: IPODW
Filing Date: 2025-04-29
Form Type: S-1/A
Source: 0001213900-25-036656
Chunk: 357

Company: Dune Acquisition Corp II
Filing Date: 2025-04-29
Form: S-1/A
Chunk 357
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 the initial distribution of the securities, the undersigned registrant undertakes that in a primary offering of securities of an undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the 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-3 (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 the city of West Palm Beach, State of Florida, on the 29 thday of April, 2025.

| Dune Acquisition Corporation II |     |                                 |
| By:                             |     | /s/ Carter Glatt                |
|                                 |     | Name: Carter Glatt              |
|                                 |     | Title: Chief Executive Officer, 
 Director and Chairman           |

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 April29, 2025.

| Name                 |     | Position                                                      |
| /s/ Carter Glatt     |     | Chief Executive Officer, Director and Chairman                |
| Carter Glatt         |     | -Principal Executive Officer                                  |
| /s/ Michael Castaldy |     | Chief Financial Officer                                       |
| Michael Castaldy     |     | -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