Chatham Capital Group, Inc. reports 10.57% decrease in ownership of AAON / AAON, Inc.

AAON, Inc.

MX ˙ BMV ˙ US0003602069

Security	MX:AAON / AAON, Inc.
Institution	Chatham Capital Group, Inc.
Latest Disclosed Ownership	63,873 shares
Latest Disclosed Value	$ 5,285,491

On April 20, 2026 - Chatham Capital Group, Inc. filed a 13F-HR form disclosing ownership of 63,873 shares of AAON, Inc. (MX:AAON) valued at $5,285,491 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 14, 2026 disclosing 71,422 shares of AAON, Inc.. This represents a change in shares of -10.57% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)

File Date	Effective Date	Form	Security	Class	ID	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-04-20	2026-03-31	13F	AAON	COM PAR $0.004	000360206	63,873	-7,549	-10.57	5,285	-2.94	0.7668
2026-01-14	2025-12-31	13F	AAON	COM PAR $0.004	000360206	71,422	3,229	4.74	5,446	-14.53	0.7749
2025-10-15	2025-09-30	13F	AAON	COM PAR $0.004	000360206	68,193	6,441	10.43	6,372	39.90	0.9165
2025-07-17	2025-06-30	13F	AAON	COM PAR $0.004	000360206	61,752	-510	-0.82	4,554	-6.37	0.6947
2025-04-10	2025-03-31	13F	AAON	COM PAR $0.004	000360206	62,262	2,010	3.34	4,865	-31.40	0.8116
2025-02-07	2024-12-31	13F	AAON	COM PAR $0.004	000360206	60,252	-6,105	-9.20	7,090	-0.91	1.1662
2024-10-16	2024-09-30	13F	AAON	COM PAR $0.004	000360206	66,357	122	0.18	7,156	23.83	1.1698
2024-07-15	2024-06-30	13F	AAON	COM PAR $0.004	000360206	66,235	-310	-0.47	5,778	-1.43	1.0086
2024-04-18	2024-03-31	13F	AAON	COM PAR $0.004	000360206	66,545	6,640	11.08	5,863	32.47	1.0759
2024-01-19	2023-12-31	13F	AAON	COM PAR $0.004	000360206	59,905	-1,954	-3.16	4,425	25.82	0.8960
2023-10-26	2023-09-30	13F	AAON	COM PAR $0.004	000360206	61,859	20,402	49.21	3,518	-10.51	0.7852
2023-07-14	2023-06-30	13F	AAON	COM PAR $0.004	000360206	41,457	-1,901	-4.38	3,931	-6.25	0.8272
2023-04-24	2023-03-31	13F	AAON	COM PAR $0.004	000360206	43,358	28	0.06	4,192	28.47	0.9370
2023-02-01	2022-12-31	13F	AAON	COM PAR $0.004	000360206	43,330	-60	-0.14	3,264	39.56	0.7652
2022-10-28	2022-09-30	13F	AAON	COM PAR $0.004	000360206	43,390	0	0.00	2,338	-1.60	0.5733
2022-08-02	2022-06-30	13F	AAON	COM PAR $0.004	000360206	43,390	100	0.23	2,376	-1.53	0.5376
2022-04-21	2022-03-31	13F	AAON	COM PAR $0.004	000360206	43,290	80	0.19	2,413	-29.69	0.4666
2022-02-02	2021-12-31	13F	AAON	COM PAR $0.004	000360206	43,210	125	0.29	3,432	21.83	0.6196
2021-10-13	2021-09-30	13F	AAON	COM PAR $0.004	000360206	43,085	-435	-1.00	2,817	3.41	0.5421
2021-07-28	2021-06-30	13F	AAON	COM PAR $0.004	000360206	43,520	5	0.01	2,724	-10.57	0.5266
2021-04-29	2021-03-31	13F	AAON	COM PAR $0.004	000360206	43,515	2,070	4.99	3,046	10.32	0.6376
2021-01-27	2020-12-31	13F	AAON	COM PAR $0.004	000360206	41,445	-206	-0.49	2,761	10.04	0.6206
2020-10-22	2020-09-30	13F	AAON	COM PAR $0.004	000360206	41,651	-376	-0.89	2,509	9.95	0.6186
2020-07-20	2020-06-30	13F	AAON	COM PAR $0.004	000360206	42,027	215	0.51	2,282	12.97	0.5906
2020-05-01	2020-03-31	13F	AAON	COM PAR $0.004	000360206	41,812	-766	-1.80	2,020	-3.99	0.5962
2020-01-31	2019-12-31	13F	AAON	COM PAR $0.004	000360206	42,578	-137	-0.32	2,104	7.24	0.5187
2019-11-08	2019-09-30	13F	AAON	COM PAR $0.004	000360206	42,715	-265	-0.62	1,962	-9.04	0.5012
2019-07-24	2019-06-30	13F	AAON	COM PAR $0.004	000360206	42,980	-655	-1.50	2,157	7.05	0.5431
2019-05-09	2019-03-31	13F	AAON	COM PAR $0.004	000360206	43,635	203	0.47	2,015	32.30	0.5183
2019-02-05	2018-12-31	13F	AAON	COM PAR $0.004	000360206	43,432	4,832	12.52	1,523	4.39	0.4229
2018-10-30	2018-09-30	13F	AAON	COM PAR $0.004	000360206	38,600	0	0.00	1,459	13.72	0.3686
2018-07-30	2018-06-30	13F	AAON	COM PAR $0.004	000360206	38,600	38,600		1,283		0.3377

Legend

Shares: The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value: The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price: The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class: This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred

Allocation (%): The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation: The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%): The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis: The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss: This is the market value of the position as of the effective date minus the cost basis.