Company: XCH
Filing Date: 2025-08-21
Form Type: 6-K
Source: 0000950170-25-110548
Chunk: 0

Company: XCHG Ltd
Filing Date: 2025-08-21
Form: 6-K
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K</div>

### REPORT OF FOREIGN PRIVATE ISSUER
<div align='center'>PURSUANT TO RULE 13a-16 OR 15d-16 UNDER

THE SECURITIES EXCHANGE ACT OF 1934

For the month of August 2025

Commission file number: 001-42208

XCHG Limited

(Exact Name of Registrant as Specified in Its Charter)

XCharge Europe GmbH, Heselstücken 18,

22453 Hamburg, Germany

+49 4057128593

No. 12 Shuang Yang Road, Da Xing District, Beijing

People’s Republic of China, 100023

+86 10-53399799

(Address of Principal Executive Offices)</div>

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

<div align='center'>Form 20-F☒Form 40-F☐</div>

EXHIBIT INDEX

| Exhibit No. |     | Description   |
| 99.1        |     | Press Release |

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.

| Date: August 21, 2025 |     | XCHG Limited 
 By:          |     | /s/ Yifei Hou                                                        |
|:----------------------|:----|:-------------|:----|:---------------------------------------------------------------------|
|                       |     |              |     | Name: Yifei Hou                                                      |
|                       |     |              |     | Title:   Chief Executive Officer and Interim Chief Financial Officer |