GATX Corporation
US ˙ ARCX ˙ US3614481030

SecurityGMT / GATX Corporation
InstitutionBrown Advisory Inc
Latest Disclosed Ownership9,931 shares
Latest Disclosed Value $ 1,695,569
Brown Advisory Inc reports 0.43% increase in ownership of GMT / GATX Corporation

On May 15, 2026 - Brown Advisory Inc filed a 13F-HR form disclosing ownership of 9,931 shares of GATX Corporation (US:GMT) valued at $1,695,569 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 9,888 shares of GATX Corporation. This represents a change in shares of 0.43% 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 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 GATX COM 361448103 9,931 43 0.43 1,696 1.07 0.0012
2026-02-13 2025-12-31 13F GATX COM 361448103 9,888 0 0.00 1,677 -2.95 0.0023
2025-11-14 2025-09-30 13F GATX COM 361448103 9,888 -86 -0.86 1,728 12.87 0.0023
2025-08-13 2025-06-30 13F GATX COM 361448103 9,974 22 0.22 1,532 -0.91 0.0020
2025-04-30 2025-03-31 13F GATX COM 361448103 9,952 0 0.00 1,545 0.19 0.0022
2025-02-14 2024-12-31 13F GATX COM 361448103 9,952 0 0.00 1,542 17.00 0.0020
2024-11-13 2024-09-30 13F GATX COM 361448103 9,952 -95 -0.95 1,318 -0.83 0.0017
2024-08-14 2024-06-30 13F GATX COM 361448103 10,047 0 0.00 1,330 -1.26 0.0017
2024-04-24 2024-03-31 13F GATX COM 361448103 10,047 181 1.83 1,347 13.49 0.0018
2024-02-08 2023-12-31 13F GATX COM 361448103 9,866 0 0.00 1,186 10.53 0.0017
2023-10-25 2023-09-30 13F GATX COM 361448103 9,866 0 0.00 1,074 -15.51 0.0018
2023-07-31 2023-06-30 13F GATX COM 361448103 9,866 0 0.00 1,270 17.05 0.0020
2023-05-08 2023-03-31 13F GATX COM 361448103 9,866 -1,001 -9.21 1,085 -6.06 0.0018
2023-02-13 2022-12-31 13F GATX COM 361448103 10,867 1 0.01 1,156 24.86 0.0021
2022-11-14 2022-09-30 13F GATX COM 361448103 10,866 118 1.10 925 -8.60 0.0018
2022-11-14 2022-06-30 13F/A-2 GATX COM 361448103 10,748 0 0.00 1,012 -23.68 0.0019
2022-09-13 2022-06-30 13F/A-1 GATX COM 361448103 10,548 0 993 0.0017
2022-08-02 2022-06-30 13F GATX COM 361448103 10,548 0 993 0.0016
2022-11-14 2022-03-31 13F/A-2 GATX COM 361448103 10,748 200 1.90 1,326 20.66 0.0020
2022-09-13 2022-03-31 13F/A-1 GATX COM 361448103 10,548 0 1,301 0.0018
2022-05-09 2022-03-31 13F GATX COM 361448103 10,548 0 1,301 0.0018
2022-01-27 2021-12-31 13F GATX COM 361448103 10,548 0 0.00 1,099 16.30 0.0014
2021-11-12 2021-09-30 13F GATX COM 361448103 10,548 -400 -3.65 945 -2.48 0.0014
2021-07-29 2021-06-30 13F GATX COM 361448103 10,948 0 0.00 969 -4.63 0.0015
2021-05-14 2021-03-31 13F GATX COM 361448103 10,948 0 0.00 1,016 11.53 0.0017
2021-02-12 2020-12-31 13F GATX COM 361448103 10,948 0 0.00 911 30.52 0.0016
2020-11-16 2020-09-30 13F GATX COM 361448103 10,948 -700 -6.01 698 -1.69 0.0014
2020-08-14 2020-06-30 13F GATX COM 361448103 11,648 0 0.00 710 -2.61 0.0017
2020-05-15 2020-03-31 13F GATX COM 361448103 11,648 -178 -1.51 729 -25.61 0.0022
2020-02-14 2019-12-31 13F GATX COM 361448103 11,826 -4,874 -29.19 980 -24.32 0.0025
2019-11-14 2019-09-30 13F GATX COM 361448103 16,700 -800 -4.57 1,295 -6.63 0.0036
2019-08-12 2019-06-30 13F GATX COM 361448103 17,500 -100 -0.57 1,387 3.28 0.0040
2019-05-15 2019-03-31 13F GATX COM 361448103 17,600 -525 -2.90 1,343 4.68 0.0038
2019-02-13 2018-12-31 13F GATX COM 361448103 18,125 -200 -1.09 1,283 -19.16 0.0043
2018-11-13 2018-09-30 13F GATX COM 361448103 18,325 7,200 64.72 1,587 92.13 0.0045
2018-08-10 2018-06-30 13F GATX COM 361448103 11,125 500 4.71 826 13.46 0.0025
2018-06-28 2018-03-31 13F/A-1 GATX COM 361448103 10,625 -2,908 -21.49 728 -13.44 0.0024
2018-05-14 2018-03-31 13F GATX COM 361448103 10,625 -2,908 728
2018-02-12 2017-12-31 13F GATX COM 361448103 13,533 0 0.00 841 0.96 0.0027
2017-11-13 2017-09-30 13F GATX COM 361448103 13,533 -1,216 -8.24 833 -12.13 0.0028
2017-08-14 2017-06-30 13F GATX COM 361448103 14,749 1,050 7.66 948 13.53 0.0029
2017-05-15 2017-03-31 13F GATX COM 361448103 13,699 0 0.00 835 -0.95 0.0028
2017-02-13 2016-12-31 13F GATX COM 361448103 13,699 0 0.00 843 38.20 0.0030
2016-11-14 2016-09-30 13F GATX COM 361448103 13,699 -2,500 -15.43 610 -14.33 0.0021
2016-08-09 2016-06-30 13F GATX COM 361448103 16,199 1,889 13.20 712 4.71 0.0025
2016-05-13 2016-03-31 13F GATX COM 361448103 14,310 7,725 117.31 680 142.86 0.0023
2016-02-08 2015-12-31 13F GATX COM 361448103 6,585 708 12.05 280 8.11 0.0009
2015-11-13 2015-09-30 13F GATX COM 361448103 5,877 1,215 26.06 259 4.44 0.0009
2015-08-11 2015-06-30 13F GATX COM 361448103 4,662 -1,925 -29.22 248 -35.08 0.0008
2015-05-14 2015-03-31 13F GATX COM 361448103 6,587 0 0.00 382 0.79 0.0012
2015-02-13 2014-12-31 13F/A-1 GATX COM 361448103 6,587 0 0.00 379 -1.30 0.0012
2015-02-09 2014-12-31 13F GATX COM 361448103 6,587 379
2014-11-10 2014-09-30 13F GATX COM 361448103 6,587 0 0.00 384 -12.93 0.0012
2014-08-08 2014-06-30 13F GATX COM 361448103 6,587 0 0.00 441 -1.34 0.0014
2014-05-13 2014-03-31 13F GATX COM 361448103 6,587 0 0.00 447 29.94 0.0014
2014-02-11 2013-12-31 13F GATX COM 361448103 6,587 6,587 344 0.0011
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.