Company: CNEY
Filing Date: 2025-10-29
Form Type: F-1/A
Source: 0001477932-25-007791
Chunk: 0

Company: CN ENERGY GROUP. INC.
Filing Date: 2025-10-29
Form: F-1/A
Chunk 0
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<div align='center'>As filed with the Securities and Exchange Commission on October 29, 2025</div>

Registration No. 333-288429

<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

PRE-EFFECTIVE AMENDMENT NO. 1 TO FORM F-3 ON FORM F-1

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933</div>

| CN ENERGY GROUP. INC.                                  |
| (Exact name of registrant as specified in its charter) |

| British Virgin Islands                                          |     | Not Applicable                         |
| (State or other jurisdiction of  incorporation or organization) |     | -I.R.S. Employer Identification Number |

<div align='center'>Building 2-B, Room 206, No. 268 Shiniu Road

Liandu District, Lishui City, Zhejiang Province

The PRC

+86 571 87555823

(Address and telephone number of Registrant’s principal executive offices)

CN Energy USA Inc.

900 19th Street NW, Floor 5, Squad 23

Washington, DC 20006

202-631-9199

(Name, address, and telephone number of agent for service)

With a Copy to:

Huan Lou, Esq.

David B. Manno, Esq.

McCarter & English, LLP

250 West 55 thStreet, Fl 13 th

New York, NY 10019

(212) 609-6800</div>

Approximate date of commencement of proposed sale to the public: From time to time after the effective date of this registration statement.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box ☒

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☒

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check