AAR Corp.
US ˙ NYSE ˙ US0003611052

SecurityAIR / AAR Corp.
InstitutionMairs & Power Inc
Latest Disclosed Ownership89,391 shares
Latest Disclosed Value $ 9,784,739
Mairs & Power Inc reports 20.31% decrease in ownership of AIR / AAR Corp.

On May 13, 2026 - Mairs & Power Inc filed a 13F-HR form disclosing ownership of 89,391 shares of AAR Corp. (US:AIR) valued at $9,784,739 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 112,176 shares of AAR Corp.. This represents a change in shares of -20.31% during the quarter. The current value of the position is $10,327,342 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)
2026-05-13 2026-03-31 13F AAR COM 000361105 89,391 -22,785 -20.31 9,785 5.35 0.1000
2026-02-17 2025-12-31 13F AAR COM 000361105 112,176 -15,526 -12.16 9,287 -18.90 0.0894
2025-11-14 2025-09-30 13F AAR COM 000361105 127,702 -28,374 -18.18 11,451 6.66 0.1076
2025-08-14 2025-06-30 13F AAR COM 000361105 156,076 -23,956 -13.31 10,736 6.52 0.1060
2025-05-15 2025-03-31 13F AAR COM 000361105 180,032 -7,917 -4.21 10,080 -12.49 0.1049
2025-02-14 2024-12-31 13F AAR COM 000361105 187,949 -75 -0.04 11,518 -6.28 0.1114
2024-11-14 2024-09-30 13F AAR COM 000361105 188,024 9,905 5.56 12,289 -5.10 0.1156
2024-08-14 2024-06-30 13F AAR COM 000361105 178,119 -22,627 -11.27 12,949 7.75 0.1251
2024-05-15 2024-03-31 13F AAR COM 000361105 200,746 16,620 9.03 12,019 4.60 0.1164
2024-02-14 2023-12-31 13F AAR COM 000361105 184,126 -26,039 -12.39 11,489 -8.17 0.1211
2023-11-14 2023-09-30 13F AAR COM 000361105 210,165 -29,262 -12.22 12,511 -9.53 0.1468
2023-08-14 2023-06-30 13F AAR COM 000361105 239,427 -13,030 -5.16 13,829 0.42 0.1504
2023-05-15 2023-03-31 13F AAR COM 000361105 252,457 -59,172 -18.99 13,772 -1.58 0.1589
2023-02-14 2022-12-31 13F AAR COM 000361105 311,629 1,100 0.35 13,992 25.79 0.1684
2022-11-14 2022-09-30 13F AAR COM 000361105 310,529 8,398 2.78 11,123 -12.01 0.1403
2022-08-15 2022-06-30 13F AAR COM 000361105 302,131 -45,574 -13.11 12,641 -24.93 0.1515
2022-05-16 2022-03-31 13F AAR COM 000361105 347,705 -33,567 -8.80 16,839 13.16 0.1696
2022-02-14 2021-12-31 13F AAR COM 000361105 381,272 -297 -0.08 14,881 20.26 0.1378
2021-11-15 2021-09-30 13F AAR COM 000361105 381,569 45,452 13.52 12,374 -5.00 0.1238
2021-08-16 2021-06-30 13F AAR COM 000361105 336,117 50,379 17.63 13,025 9.44 0.1287
2021-05-14 2021-03-31 13F AAR COM 000361105 285,738 -11,297 -3.80 11,901 10.61 0.1249
2021-02-16 2020-12-31 13F AAR COM 000361105 297,035 12,500 4.39 10,759 101.14 0.1196
2020-11-16 2020-09-30 13F AAR COM 000361105 284,535 12,175 4.47 5,349 -4.99 0.0668
2020-08-14 2020-06-30 13F AAR COM 000361105 272,360 -13,585 -4.75 5,630 10.87 0.0736
2020-05-15 2020-03-31 13F AAR COM 000361105 285,945 10,215 3.70 5,078 -59.16 0.0741
2020-02-14 2019-12-31 13F AAR COM 000361105 275,730 90 0.03 12,435 9.47 0.1413
2019-11-14 2019-09-30 13F AAR COM 000361105 275,640 270 0.10 11,359 12.12 0.1373
2019-08-14 2019-06-30 13F AAR COM 000361105 275,370 58,200 26.80 10,131 43.50 0.1216
2019-05-15 2019-03-31 13F AAR COM 000361105 217,170 39,950 22.54 7,060 6.69 0.0857
2019-02-14 2018-12-31 13F AAR COM 000361105 177,220 54,620 44.55 6,617 12.71 0.0893
2018-11-14 2018-09-30 13F AAR COM 000361105 122,600 49,000 66.58 5,871 71.57 0.0684
2018-08-14 2018-06-30 13F AAR COM 000361105 73,600 73,600 3,422 0.0424
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.