Company: GEF
Filing Date: 2025-11-19
Form Type: 10-KT
Source: 0001628280-25-053146
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Company: GREIF, INC
Filing Date: 2025-11-19
Form: 10-KT
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#### Table of Contents

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

#### FORM 10-KT
| ☐ |     | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |

<div align='center'>or</div>

| ☒ |     | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |

<div align='center'>For the transition period from November 1, 2024to September 30, 2025</div>

#### Commission file number: 001-00566

#### GREIF, INC.
<div align='center'>(Exact name of Registrant as specified in its charter)</div>

| Delaware                                                       |     |                          31-4388903 |
| (State or other jurisdiction of incorporation or organization) |     | -I.R.S. Employer Identification No. |
| 425 Winter Road,DelawareOhio                                   |     |                               43015 |
| (Address of principal executive offices)                       |     |                           -Zip Code |

<div align='center'>Registrant’s telephone number, including area code: ( 740) 549-6000

Securities registered pursuant to Section 12(b) of the Act:</div>

| Title of Each Class  |     | Trading Symbol(s) |     | Name of Each Exchange on Which Registered |
| Class A Common Stock |     | GEF               |     | New York Stock Exchange                   |
| Class B Common Stock |     | GEF.B             |     | New York Stock Exchange                   |

<div align='center'>Securities registered pursuant to Section 12(g) of the Act: None</div>

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☒ No ☐

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act. Yes ☐ No ☒

Indicate by check mark whether the Registrant (1) has filed all reports to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports