ONE Gas, Inc.
US ˙ NYSE ˙ US68235P1084

SecurityOGS / ONE Gas, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership63,127 shares
Latest Disclosed Value $ 4,876,543
Sei Investments Co reports 5.76% increase in ownership of OGS / ONE Gas, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 63,127 shares of ONE Gas, Inc. (US:OGS) valued at $4,876,561 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 59,687 shares of ONE Gas, Inc.. This represents a change in shares of 5.76% during the quarter. The current value of the position is $4,848,154 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-02-13 2025-12-31 13F ONE GAS COM 68235P108 63,127 3,440 5.76 4,877 0.93 0.0048
2025-11-13 2025-09-30 13F ONE GAS COM 68235P108 59,687 25,826 76.27 4,831 98.56 0.0052
2025-08-14 2025-06-30 13F ONE GAS COM 68235P108 33,861 -153,653 -81.94 2,433 -82.83 0.0028
2025-05-14 2025-03-31 13F/A-1 ONE GAS COM 68235P108 187,514 -1,064 -0.56 14,174 8.55 0.0182
2025-05-13 2025-03-31 13F ONE GAS COM 68235P108 188,853 275 13,088 0.0142
2025-02-11 2024-12-31 13F ONE GAS COM 68235P108 188,578 -14,212 -7.01 13,059 -13.47 0.0168
2024-11-12 2024-09-30 13F ONE GAS COM 68235P108 202,790 -26,396 -11.52 15,092 3.13 0.0196
2024-08-13 2024-06-30 13F ONE GAS COM 68235P108 229,186 -2,299 -0.99 14,634 -2.04 0.0207
2024-05-07 2024-03-31 13F ONE GAS COM 68235P108 231,485 31,046 15.49 14,938 16.96 0.0219
2024-02-14 2023-12-31 13F ONE GAS COM 68235P108 200,439 88,192 78.57 12,772 66.64 0.0205
2023-11-14 2023-09-30 13F ONE GAS COM 68235P108 112,247 2,799 2.56 7,664 -8.83 0.0138
2023-08-11 2023-06-30 13F ONE GAS COM 68235P108 109,448 -43,759 -28.56 8,407 -30.75 0.0147
2023-05-12 2023-03-31 13F ONE GAS COM 68235P108 153,207 -12,275 -7.42 12,139 -3.13 0.0225
2023-02-10 2022-12-31 13F ONE GAS COM 68235P108 165,482 -9,707 -5.54 12,530 1.61 0.0278
2022-11-14 2022-09-30 13F ONE GAS COM 68235P108 175,189 8,686 5.22 12,331 -8.78 0.0275
2022-08-15 2022-06-30 13F ONE GAS COM 68235P108 166,503 3,015 1.84 13,518 -6.29 0.0292
2022-05-13 2022-03-31 13F ONE GAS COM 68235P108 163,488 18,408 12.69 14,426 28.15 0.0290
2022-02-14 2021-12-31 13F ONE GAS COM 68235P108 145,080 6,405 4.62 11,257 28.10 0.0211
2021-11-12 2021-09-30 13F ONE GAS COM 68235P108 138,675 4,609 3.44 8,788 -11.56 0.0184
2021-08-06 2021-06-30 13F ONE GAS COM 68235P108 134,066 53,291 65.97 9,937 59.96 0.0220
2021-05-12 2021-03-31 13F ONE GAS COM 68235P108 80,775 4,200 5.48 6,212 5.66 0.0157
2021-02-08 2020-12-31 13F ONE GAS COM 68235P108 76,575 -4,958 -6.08 5,879 4.48 0.0152
2020-12-04 2020-09-30 13F/A-1 ONE GAS COM 68235P108 81,533 17,930 28.19 5,627 14.81 0.0163
2020-11-06 2020-09-30 13F ONE GAS COM 68235P108 81,566 17,963 5,629 13,553.3805
2020-08-17 2020-06-30 13F/A-1 ONE GAS COM 68235P108 63,603 6,072 10.55 4,901 1.87 0.0152
2020-08-11 2020-06-30 13F ONE GAS COM 68235P108 84,338 26,807 7,892 21,407.4701
2020-05-14 2020-03-31 13F ONE GAS COM 68235P108 57,531 -26,807 -31.79 4,811 -39.04 0.0177
2020-02-06 2019-12-31 13F ONE GAS COM 68235P108 84,338 76 0.09 7,892 -2.54 0.0235
2019-11-12 2019-09-30 13F ONE GAS COM 68235P108 84,262 48,099 133.01 8,098 147.95 0.0207
2019-08-14 2019-06-30 13F ONE GAS COM 68235P108 36,163 4,499 14.21 3,266 15.86 0.0107
2019-05-15 2019-03-31 13F ONE GAS COM 68235P108 31,664 -3,400 -9.70 2,819 -2.29 0.0095
2019-02-13 2018-12-31 13F ONE GAS COM 68235P108 35,064 0 0.00 2,885 0.00 0.0103
2018-11-08 2018-09-30 13F ONE GAS COM 68235P108 35,064 -5,351 -13.24 2,885 -4.47 0.0105
2018-08-03 2018-06-30 13F ONE GAS COM 68235P108 40,415 -243,286 -85.75 3,020 -83.88 0.0103
2018-05-11 2018-03-31 13F ONE GAS COM 68235P108 283,701 78,835 38.48 18,730 24.79 0.0718
2018-02-08 2017-12-31 13F ONE GAS COM 68235P108 204,866 -8,868 -4.15 15,009 -4.64 0.0521
2017-11-06 2017-09-30 13F ONE GAS COM 68235P108 213,734 -18,511 -7.97 15,739 -2.92 0.0559
2017-07-31 2017-06-30 13F ONE GAS COM 68235P108 232,245 -35,688 -13.32 16,213 -10.49 0.0646
2017-05-05 2017-03-31 13F ONE GAS COM 68235P108 267,933 -32,614 -10.85 18,113 -5.78 0.0794
2017-02-02 2016-12-31 13F ONE GAS COM 68235P108 300,547 4,952 1.68 19,224 5.16 0.0931
2016-11-04 2016-09-30 13F ONE GAS COM 68235P108 295,595 6,342 2.19 18,280 -5.10 0.0929
2016-08-11 2016-06-30 13F ONE GAS COM 68235P108 289,253 -40,737 -12.34 19,262 -4.46 0.1155
2016-05-10 2016-03-31 13F/A-1 ONE GAS COM 68235P108 329,990 -141,385 -29.99 20,162 -14.74 0.1255
2016-02-03 2015-12-31 13F ONE GAS COM 68235P108 471,375 -69,846 -12.91 23,648 -3.61 0.1441
2015-11-02 2015-09-30 13F/A-1 ONE GAS COM 68235P108 541,221 -135,215 -19.99 24,533 -14.78 0.2252
2015-10-30 2015-09-30 13F DIREXION SHS ETF TR COM 68235P108 541,221 24,534
2015-08-07 2015-06-30 13F/A-1 ONE GAS COM 68235P108 676,436 -36,842 -5.17 28,789 -6.64 0.2603
2015-08-04 2015-06-30 13F ONE GAS COM 68235P108 676,436 -36,842 28,789 0.2603
2015-05-14 2015-03-31 13F/A-1 ONE GAS COM 68235P108 713,278 72,229 11.27 30,835 16.69 0.2678
2015-05-01 2015-03-31 13F ONE GAS COM 68235P108 713,278 30,835
2015-02-10 2014-12-31 13F ONE GAS COM 68235P108 641,049 641,049 26,424 0.2336
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.