ONE Gas, Inc.
MX ˙ BMV ˙ US68235P1084
SecurityMX:OGS / ONE Gas, Inc.
InstitutionMagellan Asset Management Ltd
ManagerHamish Douglass
Latest Disclosed Ownership57,731 shares
Latest Disclosed Value $ 4,972,371
Magellan Asset Management Ltd reports 18.19% increase in ownership of OGS / ONE Gas, Inc.

On May 11, 2026 - Magellan Asset Management Ltd filed a 13F-HR form disclosing ownership of 57,731 shares of ONE Gas, Inc. (MX:OGS) valued at $4,972,371 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 48,846 shares of ONE Gas, Inc.. This represents a change in shares of 18.19% 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)
2026-05-11 2026-03-31 13F ONE GAS COM 68235P108 57,731 8,885 18.19 4,972 31.78 0.0645
2026-02-10 2025-12-31 13F ONE GAS COM 68235P108 48,846 4,658 10.54 3,773 5.51 0.0459
2025-11-10 2025-09-30 13F ONE GAS COM 68235P108 44,188 3,621 8.93 3,577 22.68 0.0424
2025-08-07 2025-06-30 13F ONE GAS COM 68235P108 40,567 -1,168 -2.80 2,915 -7.58 0.0333
2025-05-12 2025-03-31 13F ONE GAS COM 68235P108 41,735 -1,588 -3.67 3,155 5.13 0.0384
2025-02-12 2024-12-31 13F ONE GAS COM 68235P108 43,323 -7,957 -15.52 3,000 -21.38 0.0330
2024-11-14 2024-09-30 13F ONE GAS COM 68235P108 51,280 -273 -0.53 3,816 15.95 0.0380
2024-08-13 2024-06-30 13F ONE GAS COM 68235P108 51,553 7,754 17.70 3,292 16.45 0.0313
2024-05-14 2024-03-31 13F ONE GAS COM 68235P108 43,799 4,206 10.62 2,826 12.05 0.0270
2024-02-13 2023-12-31 13F ONE GAS COM 68235P108 39,593 834 2.15 2,523 -4.69 0.0251
2023-11-13 2023-09-30 13F ONE GAS COM 68235P108 38,759 422 1.10 2,646 -10.12 0.0281
2023-08-11 2023-06-30 13F ONE GAS COM 68235P108 38,337 856 2.28 2,945 -0.84 0.0262
2023-05-12 2023-03-31 13F ONE GAS COM 68235P108 37,481 -858 -2.24 2,970 2.27 0.0254
2023-02-13 2022-12-31 13F ONE GAS COM 68235P108 38,339 -552 -1.42 2,903 6.03 0.0248
2022-11-10 2022-09-30 13F ONE GAS COM 68235P108 38,891 -4,286 -9.93 2,738 -21.91 0.0191
2022-08-12 2022-06-30 13F ONE GAS COM 68235P108 43,177 276 0.64 3,506 -7.40 0.0191
2022-05-13 2022-03-31 13F ONE GAS COM 68235P108 42,901 -4,856 -10.17 3,786 2.19 0.0147
2022-02-11 2021-12-31 13F ONE GAS COM 68235P108 47,757 2,763 6.14 3,705 29.95 0.0094
2021-11-04 2021-09-30 13F ONE GAS COM 68235P108 44,994 4,264 10.47 2,851 -5.56 0.0057
2021-08-12 2021-06-30 13F ONE GAS COM 68235P108 40,730 -2,474 -5.73 3,019 -9.15 0.0060
2021-05-13 2021-03-31 13F ONE GAS COM 68235P108 43,204 -5,033 -10.43 3,323 -10.26 0.0070
2021-02-11 2020-12-31 13F ONE GAS COM 68235P108 48,237 6,264 14.92 3,703 27.82 0.0086
2020-11-12 2020-09-30 13F ONE GAS COM 68235P108 41,973 0 0.00 2,897 -10.42 0.0074
2020-08-14 2020-06-30 13F ONE GAS COM 68235P108 41,973 635 1.54 3,234 -6.45 0.0097
2020-05-14 2020-03-31 13F ONE GAS COM 68235P108 41,338 -1,814 -4.20 3,457 -14.39 0.0119
2020-02-13 2019-12-31 13F ONE GAS COM 68235P108 43,152 0 0.00 4,038 -2.63 0.0106
2019-11-13 2019-09-30 13F ONE GAS COM 68235P108 43,152 1,040 2.47 4,147 9.05 0.0119
2019-08-13 2019-06-30 13F ONE GAS COM 68235P108 42,112 -2,043 -4.63 3,803 -3.26 0.0109
2019-05-14 2019-03-31 13F ONE GAS COM 68235P108 44,155 6,131 16.12 3,931 29.86 0.0125
2019-03-11 2018-12-31 13F/A-1 ONE GAS COM 68235P108 38,024 212 0.56 3,027 -2.70 0.0111
2019-02-14 2018-12-31 13F ONE GAS COM 68235P108 38,024 212 3,027
2018-11-14 2018-09-30 13F ONE GAS COM 68235P108 37,812 0 0.00 3,111 10.08 0.0102
2018-08-13 2018-06-30 13F ONE GAS COM 68235P108 37,812 -1,115 -2.86 2,826 9.96 0.0099
2018-05-15 2018-03-31 13F ONE GAS COM 68235P108 38,927 4,051 11.62 2,570 0.59 0.0095
2018-02-14 2017-12-31 13F ONE GAS COM 68235P108 34,876 -1,300 -3.59 2,555 -4.09 0.0085
2017-11-13 2017-09-30 13F ONE GAS COM 68235P108 36,176 2,525 7.50 2,664 13.41 0.0100
2017-08-11 2017-06-30 13F ONE GAS COM 68235P108 33,651 -549 -1.61 2,349 17.45 0.0099
2017-05-16 2017-03-31 13F ONE GAS COM 68235P108 34,200 -3,520 -9.33 2,000 -17.12 0.0088
2017-02-15 2016-12-31 13F ONE GAS COM 68235P108 37,720 -704 -1.83 2,413 1.56 0.0113
2016-11-14 2016-09-30 13F ONE GAS COM 68235P108 38,424 -369 -0.95 2,376 -8.01 0.0119
2016-08-19 2016-06-30 13F ONE GAS COM 68235P108 38,793 -1,399 -3.48 2,583 5.17 0.0145
2016-05-13 2016-03-31 13F ONE GAS COM 68235P108 40,192 -1,166 -2.82 2,456 18.36 0.0132
2016-02-11 2015-12-31 13F ONE GAS COM 68235P108 41,358 0 0.00 2,075 10.67 0.0116
2015-11-10 2015-09-30 13F ONE GAS COM 68235P108 41,358 0 0.00 1,875 6.53 0.0118
2015-08-13 2015-06-30 13F ONE GAS COM 68235P108 41,358 4,190 11.27 1,760 9.52 0.0110
2015-05-12 2015-03-31 13F ONE GAS COM 68235P108 37,168 -6,170 -14.24 1,607 -10.02 0.0103
2015-02-12 2014-12-31 13F ONE GAS COM 68235P108 43,338 43,338 1,786 0.0127
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.