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

For the month of July 2023

Commission file number: 001-34936

Noah Holdings Limited

1226 South Shenbin Road

Shanghai 201107

People’s Republic of China

+86 (21) 8035-8292

(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 x           Form 40-F ¨

EXHIBIT INDEX

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: July 3, 2023

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.

Noah Holdings

NoahHoldings Private Wealth and Asset Management Limited

諾亞控股私人財富資產管理有限公司

(Incorporatedin the Cayman Islands with limited liability under the name Noah Holdings Limited and carrying on business in Hong Kong as Noah HoldingsPrivate Wealth and Asset Management Limited)

(StockCode: 6686)

SUPPLEMENTALANNOUNCEMENT

CONNECTEDTRANSACTION

ACQUISITIONOF SHARES IN DD FINANCE LTD.

Reference is made to the announcement (the “Announcement”) of Noah Holdings Private Wealth and Asset Management Limited (the “Company”) dated June 28, 2023 in relation to the connected transaction regarding the acquisition of shares in DD Finance Ltd. Unless the context requires otherwise, capitalized terms used in this announcement shall have the same meanings as those defined in the Announcement.

The Company would like to provide further information on the identities of the ultimate beneficial owners (“UBOs”) of (i) LC Fund VII, L.P. and LC Parallel Fund VII, L.P.; and (ii) Whale Yin Development Co., Limited as follows:

LCFund VII, L.P. and LC Parallel Fund VII, L.P.

Each of LC Fund VII, L.P. and LC Parallel Fund VII, L.P. are investment holding vehicles of and controlled by Legend Capital. As of the date of the Announcement, to the best of the Directors’ knowledge, information and belief having made all reasonable enquiries, the UBOs of Legend Capital are four individuals, namely, Hao Chen, Jiaqing Li, Nengguang Wang and Linan Zhu, who are also the UBOs of each of LC Fund VII, L.P. and LC Parallel Fund VII, L.P.

WhaleYin Development Co., Limited

As of the date of the Announcement, to the best of the Directors’ knowledge, information and belief having made all reasonable enquiries, the UBOs of Whale Yin Development Co., Limited are two individuals, namely, Wei Huang and Zhongyan Huo.

This announcement is supplemental to and should be read in conjunction with the Announcement. The above additional information does not affect other information and content set out in the Announcement. Save as disclosed in this announcement, all information in the Announcement remains unchanged.

Hong Kong, July 3, 2023

Asof the date of this announcement, the Board comprises Ms. Jingbo Wang, the chairwoman of the Board, Mr. Zhe Yin and Ms. Chia-Yue Changas Directors; Mr. Neil Nanpeng Shen and Mr. Boquan He as non-executive Directors; and Dr. Zhiwu Chen, Ms. May Yihong Wu, Mr. Tze-KaingYang and Mr. Jinbo Yao as independent Directors.