6-K

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

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Forthe month of November 2025

Commission File Number: 001-37385

Baozun Inc.

No. 1-9, Lane 510, West Jiangchang Road

Shanghai 200436

The People’s Republic of China

(Address of principal executive office)

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

Form 20-F x   Form 40-F ¨

SIGNATURES

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: November 12, 2025

Exhibit Index

Safe Harbor Statement

This announcement contains forward-looking statements. These statements are made under the “safe harbor” provisions of the U.S. Private Securities Litigation Reform Act of 1995. These forward-looking statements can be identified by terminology such as “will,” “expects,” “anticipates,” “aims,” “future,” “intends,” “plans,” “believes,” “estimates,” “confident,” “potential,” “continues,” “ongoing,” “targets,” “guidance,” “going forward,” “outlook” or other similar expressions. Statements that are not historical facts, including but not limited to statements about Baozun’s beliefs and expectations, are forward-looking statements. Forward-looking statements involve inherent risks and uncertainties. A number of factors could cause actual results to differ materially from those contained in any forward-looking statement, including but not limited to Baozun’s filings with the United States Securities and Exchange Commission and its announcements, notices or other documents published on the website of The Stock Exchange of Hong Kong Limited. All information provided in this announcement is as of the date hereof and is based on assumptions that Baozun believes to be reasonable as of this date, and Baozun undertakes no obligation to update such information, except as required under applicable law.

Exhibit 99.1

Hong Kong Exchanges and Clearing Limited andThe Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement, make no representation as to itsaccuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon thewhole or any part of the contents of this announcement.

Under our weighted voting rights structure,our share capital comprises Class A ordinary shares and Class B ordinary shares. Each Class A ordinary share entitles the holder to exerciseone vote, and each Class B ordinary share entitles the holder to exercise ten votes, respectively, on any resolution tabled at our generalmeetings, except as may otherwise be required by law or by the Rules Governing the Listing of Securities on the Stock Exchange of HongKong Limited or provided for in our memorandum and articles of association. Shareholders and prospective investors should be aware ofthe potential risks of investing in a company with a weighted voting rights structure. Our American depositary shares, each representingthree of our Class A ordinary shares, are listed on the Nasdaq Global Select Market in the United States under the symbol BZUN.

BaozunInc.

寶尊電商有限公司^*^

(A companycontrolled through weighted voting rights and incorporated in the Cayman Islands with limited liability)

(Stockcode: 9991)

DATEOF BOARD MEETING

The board of directors of Baozun Inc. (the “Company”) will hold a board meeting on November 25, 2025 (Hong Kong time) for the purposes of, among others, approving our unaudited financial results and announcement for the third quarter ended September 30, 2025 (“Results”), which are prepared in accordance with the U.S. Generally Accepted Accounting Principles and the applicable rules of the U.S. Securities and Exchange Commission, and its publication. If approved, we will announce our Results on November 25, 2025 (Hong Kong time), before the opening of the U.S. market and after the trading hours of the Hong Kong market, on the website of the Hong Kong Stock Exchange at www.hkexnews.hk and our website at www.baozun.com.

The earnings conference call will take place at 7:30 p.m. on November 25, 2025 (Hong Kong time). Our management will be on the call to discuss the Results.

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Dial-in details for the earnings conference call are as follows:

A replay of the conference call may be accessible through December 2, 2025 by dialing the following numbers:

A live and archived webcast of the conference call will be available on the investor relations section of our website at http://ir.baozun.com.

Hong Kong, November 11, 2025

As at thedate of this announcement, our board of directors comprises Mr. Vincent Wenbin Qiu as the chairman, Mr. Junhua Wu, Mr. SatoshiOkada, Dr. Jun Wang and Ms. Bin Yu as directors, and Mr. Yiu Pong Chan, Mr. Steve Hsien-Chieng Hsia and Mr. BenjaminChangqing Ye as independent directors.

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