AAON, Inc.
US ˙ NasdaqGS ˙ US0003602069

SecurityAAON / AAON, Inc.
InstitutionBrown Advisory Inc
Latest Disclosed Ownership672,849 shares
Latest Disclosed Value $ 55,678,282
Brown Advisory Inc reports 14.30% decrease in ownership of AAON / AAON, Inc.

On May 15, 2026 - Brown Advisory Inc filed a 13F-HR form disclosing ownership of 672,849 shares of AAON, Inc. (US:AAON) valued at $55,678,255 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 785,141 shares of AAON, Inc.. This represents a change in shares of -14.30% during the quarter. The current value of the position is $99,749,864 USD.

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 Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F AAON COM PAR $0.004 000360206 672,849 -112,292 -14.30 55,678 -7.00 0.0408
2026-02-13 2025-12-31 13F AAON COM PAR $0.004 000360206 785,141 -42,899 -5.18 59,867 -22.62 0.0835
2025-11-14 2025-09-30 13F AAON COM PAR $0.004 000360206 828,040 112,582 15.74 77,372 46.64 0.1007
2025-08-13 2025-06-30 13F AAON COM PAR $0.004 000360206 715,458 188,383 35.74 52,765 28.13 0.0695
2025-04-30 2025-03-31 13F AAON COM PAR $0.004 000360206 527,075 527,075 41,180 0.0589
2019-08-12 2019-06-30 13F AAON COM PAR $0.004 000360206 0 -60,515 -100.00 0 -100.00
2019-05-15 2019-03-31 13F AAON COM PAR $0.004 000360206 60,515 -3,950 -6.13 2,795 23.67 0.0079
2019-02-13 2018-12-31 13F AAON COM PAR $0.004 000360206 64,465 -16,255 -20.14 2,260 -25.93 0.0076
2018-11-13 2018-09-30 13F AAON COM PAR $0.004 000360206 80,720 0 0.00 3,051 13.67 0.0087
2018-08-10 2018-06-30 13F AAON COM PAR $0.004 000360206 80,720 80,720 2,684 0.0083
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.