Assetmark, Inc reports 50.77% increase in ownership of GATX / GATX Corporation

GATX Corporation

US ˙ NYSE ˙ US3614481030

Security	GATX / GATX Corporation
Institution	Assetmark, Inc
Latest Disclosed Ownership	196 shares
Latest Disclosed Value	$ 33,465

On May 6, 2026 - Assetmark, Inc filed a 13F-HR form disclosing ownership of 196 shares of GATX Corporation (US:GATX) valued at $33,465 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 130 shares of GATX Corporation. This represents a change in shares of 50.77% during the quarter. The current value of the position is $32,691 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	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-06	2026-03-31	13F	GATX	COM	361448103	196	66	50.77	33	50.00	0.0001
2026-01-23	2025-12-31	13F	GATX	COM	361448103	130	-72	-35.64	22	-37.14	0.0000
2025-11-06	2025-09-30	13F	GATX	COM	361448103	202	-6	-2.88	35	12.90	0.0001
2025-08-04	2025-06-30	13F	GATX	COM	361448103	208	30	16.85	32	14.81	0.0001
2025-05-06	2025-03-31	13F	GATX	COM	361448103	178	0	0.00	28	0.00	0.0001
2025-02-06	2024-12-31	13F	GATX	COM	361448103	178	67	60.36	28	92.86	0.0001
2024-11-01	2024-09-30	13F	GATX	COM	361448103	111	0	0.00	15	0.00	0.0000
2024-08-13	2024-06-30	13F	GATX	COM	361448103	111	0	0.00	15	0.00	0.0000
2024-05-07	2024-03-31	13F	GATX	COM	361448103	111	0	0.00	15	7.69	0.0000
2024-02-09	2023-12-31	13F	GATX	COM	361448103	111	-2	-1.77	13	8.33	0.0000
2023-10-27	2023-09-30	13F	GATX	COM	361448103	113	2	1.80	12	-14.29	0.0000
2023-08-11	2023-06-30	13F	GATX CORP COM	COM	361448103	111	0	0.00	14	16.67	0.0001
2023-05-05	2023-03-31	13F	GATX CORP COM	COM	361448103	111	0	0.00	12	9.09	0.0001
2023-02-10	2022-12-31	13F	GATX	COM	361448103	111	0	0.00	12	22.22	0.0001
2022-11-01	2022-09-30	13F	GATX	COM	361448103	111	0	0.00	9	-10.00	0.0000
2022-08-03	2022-06-30	13F	GATX CORP COM	COM	361448103	111	0	0.00	10	-28.57	0.0000
2022-05-13	2022-03-31	13F	GATX CORP COM	COM	361448103	111	0	0.00	14	16.67	0.0001
2022-02-14	2021-12-31	13F	GATX CORP COM	COM	361448103	111	0	0.00	12	20.00	0.0000
2021-11-12	2021-09-30	13F	GATX CORP COM	COM	361448103	111	0	0.00	10	0.00	0.0000
2021-08-16	2021-06-30	13F	GATX CORP COM	COM	361448103	111	0	0.00	10	0.00	0.0000
2021-05-14	2021-03-31	13F	GATX	COM	361448103	111	0	0.00	10	11.11	0.0001
2021-02-10	2020-12-31	13F	GATX CORP COM	COM	361448103	111	0	0.00	9	28.57	0.0001
2020-11-13	2020-09-30	13F	GATX CORP COM	COM	361448103	111	-147	-56.98	7	-56.25	0.0000
2020-08-11	2020-06-30	13F	GATX CORP COM	COM	361448103	258	-110	-29.89	16	-30.43	0.0001
2020-05-12	2020-03-31	13F	GATX CORP COM	COM	361448103	368	0	0.00	23	-23.33	0.0002
2020-02-11	2019-12-31	13F	GATX CORP COM	COM	361448103	368	0	0.00	30	3.45	0.0002
2019-11-13	2019-09-30	13F	GATX CORP COM	COM	361448103	368	0	0.00	29	0.00	0.0002
2019-08-14	2019-06-30	13F	GATX CORP COM	COM	361448103	368	0	0.00	29	3.57	0.0002
2019-05-14	2019-03-31	13F	GATX CORP COM	COM	361448103	368	0	0.00	28	7.69	0.0003
2019-02-13	2018-12-31	13F	GATX CORP COM	COM	361448103	368	0	0.00	26	-18.75	0.0003
2018-11-13	2018-09-30	13F	GATX CORP COM	COM	361448103	368	0	0.00	32	18.52	0.0003
2018-08-01	2018-06-30	13F	GATX CORP COM	COM	361448103	368	0	0.00	27	8.00	0.0003
2018-05-16	2018-03-31	13F	GATX CORP COM	COM	361448103	368	-32	-8.00	25	0.00	0.0003
2018-02-13	2017-12-31	13F	GATX CORP COM	COM	361448103	400	0	0.00	25	0.00	0.0003
2017-11-08	2017-09-30	13F	GATX CORP COM	COM	361448103	400	0	0.00	25	-3.85	0.0003
2017-08-14	2017-06-30	13F	GATX CORP COM	COM	361448103	400	0	0.00	26	8.33	0.0003
2017-09-15	2017-03-31	13F/A-1	GATX CORP COM	COM	361448103	400	173	76.21	24	71.43	0.0003
2017-05-08	2017-03-31	13F	GATX CORP COM	COM	361448103	400	173		24
2017-09-15	2016-12-31	13F/A-1	GATX CORP COM	COM	361448103	227	-236	-50.97	14	-33.33	0.0002
2017-02-14	2016-12-31	13F	GATX CORP COM	COM	361448103	227	-236		14
2017-09-14	2016-09-30	13F/A-1	GATX CORP COM	COM	361448103	463	0	0.00	21	5.00	0.0003
2016-11-04	2016-09-30	13F	GATX CORP COM	COM	361448103	463	0		21
2017-09-14	2016-06-30	13F/A-1	GATX CORP COM	COM	361448103	463	-1,215	-72.41	20	-75.00	0.0003
2016-08-08	2016-06-30	13F	GATX CORP COM	COM	361448103	463	-1,215		20
2017-09-14	2016-03-31	13F/A-1	GATX CORP COM	COM	361448103	1,678	449	36.53	80	53.85	0.0014
2016-05-13	2016-03-31	13F	GATX CORP COM	COM	361448103	1,678	449		80
2017-09-14	2015-12-31	13F/A-1	GATX CORP COM	COM	361448103	1,229	1,127	1,104.90	52	940.00	0.0010
2016-02-12	2015-12-31	13F	GATX CORP COM	COM	361448103	1,229	1,127		52
2016-01-05	2015-09-30	13F/A-1	GATX CORP COM	COM	361448103	102	102		5		0.0001
2015-11-10	2015-09-30	13F	GATX CORP COM	COM	361448103	102			5		0.0001

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.