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 July 2024

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: July 16, 2024

2

Exhibit Index

3

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.

4

Exhibit 99.1

HongKong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement,make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arisingfrom or in reliance upon the whole or any part of the contents of this announcement

Underour weighted voting rights structure, our share capital comprises Class A ordinary shares and Class B ordinary shares. EachClass A ordinary share entitles the holder to exercise one vote, and each Class B ordinary share entitles the holder to exerciseten votes, respectively, on any resolution tabled at our general meetings, except as may otherwise be required by law or by the Rules Governingthe Listing of Securities on The Stock Exchange of Hong Kong Limited or provided for in our memorandum and articles of association. Shareholdersand prospective investors should be aware of the potential risks of investing in a company with a weighted voting rights structure. OurAmerican depositary shares, each representing three of our Class A ordinary shares, are listed on the Nasdaq Global Select Marketin the United States under the symbol BZUN.

Baozun Inc.

寶尊電商有限公司*****

(A company controlled throughweighted voting rights and incorporated in the Cayman Islands with limited liability)

(Stock code: 9991)

CHANGE OF CUSTODIAN BANK

Baozun Inc. hereby announces that the Company was recently informed that JP Morgan Chase Bank, N.A., the depositary facility for the American depositary shares (the “ADS(s)”) of the Company, will change its custodian to HSBC Hong Kong with effect from August 12, 2024. As a result, from July 29, 2024 to August 12, 2024, the Company will not be able to facilitate the conversion between its ADSs and its ordinary shares registered on the Company’s Cayman share registrar and from August 5, 2024 to August 12, 2024, the Company will not be able to facilitate the conversion between its ADSs and its ordinary shares registered on the Company’s Hong Kong branch share registrar, Computershare Hong Kong Investor Services Limited.

Save for the abovementioned impacts, the change of custodian will not affect the trading of the Company’s securities on The Nasdaq Global Select Market or on The Stock Exchange of Hong Kong Limited during the migration period.

Hong Kong, July 16, 2024

As at the date of this announcement,our board of directors comprises Mr. Vincent Wenbin Qiu as the chairman, Mr. Junhua Wu, Mr. Satoshi Okada, Dr. JunWang and Ms. Bin Yu as directors, and Mr. Yiu Pong Chan, Mr. Steve Hsien-Chieng Hsia and Mr. Benjamin Changqing Yeas independent directors.