# EDGAR Filing Document

**Accession Number:** 0001784383
**File Stem:** 0000105132-25-000081
**Filing Date:** 2025-10
**Character Count:** 6566
**Document Hash:** 0d3e5c2c48b2c458585ecda488620162
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000105132-25-000081.hdr.sgml**: 20251029

**ACCESSION NUMBER**: 0000105132-25-000081

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251027

**FILED AS OF DATE**: 20251029

**DATE AS OF CHANGE**: 20251029

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Olsem Patricia Q
- **CENTRAL INDEX KEY:** 0001784383

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-06936
- **FILM NUMBER:** 251427372

**MAIL ADDRESS:**
- **STREET 1:** 9715 BUSINESSPARK AVENUE
- **CITY:** SAN DIEGO
- **STATE:** CA
- **ZIP:** 92131
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** WD 40 CO
- **CENTRAL INDEX KEY:** 0000105132
- **STANDARD INDUSTRIAL CLASSIFICATION:** MISCELLANEOUS CHEMICAL PRODUCTS [2890]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 951797918
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0831

**BUSINESS ADDRESS:**
- **STREET 1:** 9715 BUSINESSPARK AVENUE
- **CITY:** SAN DIEGO
- **STATE:** CA
- **ZIP:** 92131
- **BUSINESS PHONE:** 6192751400

**MAIL ADDRESS:**
- **STREET 1:** 9715 BUSINESSPARK AVENUE
- **CITY:** SAN DIEGO
- **STATE:** CA
- **ZIP:** 92131

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Olsem Patricia Q<br><sub>(Last) (First) (Middle)</sub><br>C/O:  WD-40 COMPANY<br>9715 BUSINESSPARK AVE.<br><sub>(Street)</sub><br>SAN DIEGO, CA 92131<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-10-27 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_Division President, Americas_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>WD 40 CO [ WDFC ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2025-10-27 |  | F |  | 335 | D | <sup>(1)</sup> | 5475 | D |  |
| Common Stock | 2025-10-27 |  | F |  | 401 | D | <sup>(2)</sup> | 5074<sup>(3)</sup> | D |  |
| Common Stock |  |  |  |  |  |  |  | 2914<sup>(4)</sup> | I | By Trust |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) Shares withheld pursuant to mandatory provisions of Restricted Stock Unit (RSU) Award Agreement(s) in satisfaction of tax withholding obligations upon vesting of 933 RSUs.

(2) Shares withheld pursuant to mandatory provisions of Market Share Unit (MSU) Award Agreement in satisfaction of tax withholding obligations upon vesting of 1,120 MSUs.

(3) Amount reported includes: (i) 1,842 unvested RSUs, (ii) 644 shares of restricted Common Stock received upon settlement of performance stock units or PSUs, and (iii) 89 vested deferred performance units or DPUs, which are Common Stock equivalents.

(4) Under the 2007 Olsem Family Trust, Reporting Person shares voting power and investment discretion with her spouse.  Note:  5,274 shares previously reported as held by such trust was incorrect, and the difference is held directly by Reporting Person.

**Signature:** Ann T. Nguyen, attorney-in-fact for Patricia Q. Olsem  
**Date:** 2025-10-29

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**