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 March 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: March 6, 2025

Exhibit Index

Exhibit 99.1 — Press Release

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

Under our weighted votingrights structure, our share capital comprises Class A ordinary shares and Class B ordinary shares. Each Class A ordinaryshare entitles the holder to exercise one vote, and each Class B ordinary share entitles the holder to exercise ten votes, respectively,on any resolution tabled at our general meetings, except as may otherwise be required by law or by the Rules Governing the Listingof 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 controlledthrough weighted voting rights and incorporated in the Cayman Islands with limited liability)

(Stock code:9991)

DATE OF BOARDMEETING

The board of directors of Baozun Inc. (the “Company”) will hold a board meeting on March 20, 2025 (Hong Kong time) for the purposes of, among others, approving our financial results and announcement for the fourth quarter and the full year ended December 31, 2024 (“Results”), which are prepared in accordance with the U.S. Generally Accepted Accounting Principles (“U.S.GAAP”) and the applicable rules of the U.S. Securities and Exchange Commission (the “SEC”), and its publication. If approved, we will announce our Results on March 20, 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 March 20, 2025 (Hong Kong time). Our management will be on the call to discuss the Results.

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

1

A replay of the conference call may be accessible through March 27, 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.

The Company will further issue an announcement of its annual results for the fiscal year ended December 31, 2024 in accordance with the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited (the “Hong Kong Listing Rules”) on or before March 31, 2025, which are expected to be the same as the Results prepared in accordance with the U.S. GAAP and the applicable rules of the SEC, except for specific additional information required by the Hong Kong Listing Rules, together with a reconciliation of the Company’s annual results from U.S. GAAP to International Financial Reporting Standards.

Hong Kong, March 6, 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.

2