# EDGAR Filing Document

**Accession Number:** 0000824142
**File Stem:** 0001903665-26-000004
**Filing Date:** 2026-3
**Character Count:** 5394
**Document Hash:** ce13cdb42b44bf52966d3f3cf66ec824
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001903665-26-000004.hdr.sgml**: 20260305

**ACCESSION NUMBER**: 0001903665-26-000004

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260101

**FILED AS OF DATE**: 20260305

**DATE AS OF CHANGE**: 20260305

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Wichman Gordon Douglas
- **CENTRAL INDEX KEY:** 0001903665

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-18953
- **FILM NUMBER:** 26725162

**MAIL ADDRESS:**
- **STREET 1:** 4300 WILLOW BEND DR.
- **CITY:** LONGVIEW
- **STATE:** TX
- **ZIP:** 75602
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AAON, INC.
- **CENTRAL INDEX KEY:** 0000824142
- **STANDARD INDUSTRIAL CLASSIFICATION:** AIR COND & WARM AIR HEATING EQUIP & COMM & INDL REFRIG EQUIP [3585]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 870448736
- **STATE OF INCORPORATION:** NV
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 2425 SOUTH YUKON AVE.
- **CITY:** TULSA
- **STATE:** OK
- **ZIP:** 74107
- **BUSINESS PHONE:** 9185832266

**MAIL ADDRESS:**
- **STREET 1:** 2425 SOUTH YUKON AVE.
- **CITY:** TULSA
- **STATE:** OK
- **ZIP:** 74107

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AAON INC
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DIAMOND HEAD RESOURCES INC
- **DATE OF NAME CHANGE:** 19900808

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

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Wichman Gordon Douglas<br><sub>(Last) (First) (Middle)</sub><br>2425 S YUKON AVE<br><sub>(Street)</sub><br>TULSA, OK 74107<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>AAON, INC. [ AAON ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-01-01 | **4. 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>_Executive Vice President_ | **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 Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Common Stock, par value $.004 | 10319 | D |  |
| Common Stock, par value $.004 | 4371 | I | 401(k) Plan |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| Stock Option (Right to Buy) | 2020-03-11 | 2029-03-11 | Common Stock | 24250 | $27.58 | D |  |
| Stock Option (Right to Buy) | 2021-03-11 | 2030-03-11 | Common Stock | 15780 | $29.48 | D |  |
| Stock Option (Right to Buy) | 2022-03-11 | 2031-03-11 | Common Stock | 6106 | $48.91 | D |  |
| Stock Option (Right to Buy) | 2023-03-15 | 2032-03-15 | Common Stock | 5670 | $36.13 | D |  |
| Stock Option (Right to Buy) | 2024-03-06 | 2033-03-06 | Common Stock | 4261 | $62.04 | D |  |
| Stock Option (Right to Buy) | 2025-03-11 | 2034-03-11 | Common Stock | 3126 | $79.73 | D |  |
| Stock Option (Right to Buy) | 2026-03-11 | 2035-03-11 | Common Stock | 1935 | $82.39 | D |  |

---

**Remarks:**
This Form 3 is being filed late due to an administrative error resulting from the reporting person having previously filed a Form 3 in connection with his prior status as a Section 16 reporting person of the registrant.  Form 4 filings for the reporting person have been made on a timely basis since he returned to Section 16 reporting person status.

**Signature:** Gordon D. Wichman  
**Date:** 2026-03-05

### 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.**