Company: OWLS
Filing Date: 2025-12-09
Form Type: 6-K
Source: 0001193125-25-311994
Chunk: 0

Company: OBOOK HOLDINGS INC.
Filing Date: 2025-12-09
Form: 6-K
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION
WASHINGTON D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIES EXCHANGE ACT OF 1934

December 2025

Commission File Number: 001-42858

OBOOK Holdings Inc.

9F., No. 28, Wencheng Rd., Beitou Dist.,

Taipei City 112, Taiwan,

Republic of China

+886-2-6610-0180

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under
cover Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

TABLE OF CONTENTS

| Exhibit 99.1 |     | OBOOK Holdings Inc. (OWLS) Collaborates with Visa to Launch OwlPay Cash App for Remittances |

SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

| OBOOK Holdings Inc. |     |                                      |
| By:                 |     | /s/ Chun-Kai Wang                    |
| Name:               |     | Chun-Kai Wang                        |
| Title:              |     | Chairman and Chief Executive Officer |

Date: December 9, 2025