Atmos Energy Corporation
US ˙ NYSE ˙ US0495601058

SecurityATO / Atmos Energy Corporation
InstitutionNorthern Trust Corp
Latest Disclosed Ownership1,549,694 shares
Latest Disclosed Value $ 286,259,475
Northern Trust Corp reports 2.54% increase in ownership of ATO / Atmos Energy Corporation

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 1,549,694 shares of Atmos Energy Corporation (US:ATO) valued at $286,259,476 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,511,339 shares of Atmos Energy Corporation. This represents a change in shares of 2.54% during the quarter. The current value of the position is $260,286,604 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)
2026-05-14 2026-03-31 13F ATMOS ENERGY COM 049560105 1,549,694 38,355 2.54 286,259 12.99 0.0078
2026-02-17 2025-12-31 13F ATMOS ENERGY COM 049560105 1,511,339 -8,166 -0.54 253,346 -2.35 0.0067
2025-11-14 2025-09-30 13F ATMOS ENERGY COM 049560105 1,519,505 -28,678 -1.85 259,455 8.75 0.0332
2025-08-13 2025-06-30 13F ATMOS ENERGY COM 049560105 1,548,183 -78,592 -4.83 238,590 -5.12 0.0328
2025-05-13 2025-03-31 13F ATMOS ENERGY COM 049560105 1,626,775 -12,298 -0.75 251,467 10.16 0.0373
2025-02-14 2024-12-31 13F ATMOS ENERGY COM 049560105 1,639,073 233,790 16.64 228,274 17.11 0.0323
2024-11-13 2024-09-30 13F ATMOS ENERGY COM 049560105 1,405,283 -42,984 -2.97 194,927 15.38 0.0319
2024-08-14 2024-06-30 13F ATMOS ENERGY COM 049560105 1,448,267 -23,508 -1.60 168,940 -3.43 0.0285
2024-05-14 2024-03-31 13F ATMOS ENERGY COM 049560105 1,471,775 -42,753 -2.82 174,950 -0.33 0.0302
2024-02-13 2023-12-31 13F ATMOS ENERGY COM 049560105 1,514,528 -75,977 -4.78 175,534 4.19 0.0318
2023-11-13 2023-09-30 13F ATMOS ENERGY COM 049560105 1,590,505 58,966 3.85 168,482 -5.44 0.0326
2023-08-11 2023-06-30 13F ATMOS ENERGY COM 049560105 1,531,539 -87,939 -5.43 178,179 -2.08 0.0342
2023-05-15 2023-03-31 13F ATMOS ENERGY COM 049560105 1,619,478 27,295 1.71 181,965 1.98 0.0361
2023-02-13 2022-12-31 13F ATMOS ENERGY COM 049560105 1,592,183 20,275 1.29 178,436 11.45 0.0374
2022-11-14 2022-09-30 13F ATMOS ENERGY COM 049560105 1,571,908 -31,602 -1.97 160,099 -10.93 0.0366
2022-08-12 2022-06-30 13F ATMOS ENERGY COM 049560105 1,603,510 64,443 4.19 179,754 -2.26 0.0385
2022-05-13 2022-03-31 13F ATMOS ENERGY COM 049560105 1,539,067 161,281 11.71 183,903 27.40 0.0324
2022-02-08 2021-12-31 13F ATMOS ENERGY COM 049560105 1,377,786 10,635 0.78 144,350 19.71 0.0236
2021-11-15 2021-09-30 13F ATMOS ENERGY COM 049560105 1,367,151 1,009 0.07 120,583 -8.16 0.0213
2021-08-13 2021-06-30 13F ATMOS ENERGY COM 049560105 1,366,142 3,517 0.26 131,300 -2.52 0.0231
2021-05-12 2021-03-31 13F ATMOS ENERGY COM 049560105 1,362,625 10,339 0.76 134,695 4.38 0.0251
2021-02-11 2020-12-31 13F ATMOS ENERGY COM 049560105 1,352,286 -29,331 -2.12 129,048 -2.29 0.0251
2020-11-16 2020-09-30 13F ATMOS ENERGY COM 049560105 1,381,617 -21,104 -1.50 132,069 -5.45 0.0290
2020-08-14 2020-06-30 13F ATMOS ENERGY COM 049560105 1,402,721 18,884 1.36 139,682 1.72 0.0331
2020-05-14 2020-03-31 13F ATMOS ENERGY COM 049560105 1,383,837 23,174 1.70 137,318 -9.78 0.0394
2020-02-14 2019-12-31 13F ATMOS ENERGY COM 049560105 1,360,663 -17,077 -1.24 152,204 -3.00 0.0341
2019-11-13 2019-09-30 13F ATMOS ENERGY COM 049560105 1,377,740 3,844 0.28 156,911 8.19 0.0376
2019-08-13 2019-06-30 13F ATMOS ENERGY COM 049560105 1,373,896 108,766 8.60 145,028 11.37 0.0344
2019-05-13 2019-03-31 13F ATMOS ENERGY COM 049560105 1,265,130 214,567 20.42 130,219 33.68 0.0322
2019-02-12 2018-12-31 13F ATMOS ENERGY COM 049560105 1,050,563 82,537 8.53 97,408 7.15 0.0273
2018-11-14 2018-09-30 13F ATMOS ENERGY COM 049560105 968,026 18,569 1.96 90,907 6.22 0.0222
2018-09-18 2018-06-30 13F/A-1 ATMOS ENERGY COM 049560105 949,457 15,028 1.61 85,585 8.73 0.0217
2018-08-14 2018-06-30 13F ATMOS ENERGY COM 049560105 956,675 22,246 86,235
2018-05-09 2018-03-31 13F ATMOS ENERGY COM 049560105 934,429 7,088 0.76 78,716 -1.17 0.0205
2018-02-14 2017-12-31 13F ATMOS ENERGY COM 049560105 927,341 -19,607 -2.07 79,649 0.32 0.0202
2017-11-13 2017-09-30 13F ATMOS ENERGY COM 049560105 946,948 -14,831 -1.54 79,392 -0.49 0.0207
2017-08-11 2017-06-30 13F ATMOS ENERGY COM 049560105 961,779 1,335 0.14 79,780 5.16 0.0223
2017-05-12 2017-03-31 13F ATMOS ENERGY COM 049560105 960,444 24,529 2.62 75,866 9.32 0.0219
2017-02-13 2016-12-31 13F ATMOS ENERGY COM 049560105 935,915 -11,567 -1.22 69,398 -1.65 0.0213
2016-11-09 2016-09-30 13F ATMOS ENERGY COM 049560105 947,482 22,107 2.39 70,559 -6.24 0.0220
2016-08-12 2016-06-30 13F ATMOS ENERGY COM 049560105 925,375 29,784 3.33 75,252 15.06 0.0244
2016-08-19 2016-03-31 13F/A-1 ATMOS ENERGY COM 049560105 895,591 84,153 10.37 65,403 27.86 0.0217
2016-05-13 2016-03-31 13F Atmos Energy COMM 049560105 895,591 66,507
2016-02-12 2015-12-31 13F Atmos Energy COMM 049560105 811,438 -51,629 -5.98 51,154 1.87 0.0170
2015-11-12 2015-09-30 13F Atmos Energy COMM 049560105 863,067 93,138 12.10 50,214 27.18 0.0168
2015-08-13 2015-06-30 13F ATMOS ENERGY COM 049560105 769,929 -125,944 -14.06 39,482 -20.31 0.0268
2015-05-14 2015-03-31 13F Atmos Energy COMM 049560105 895,873 4,889 0.55 49,542 -0.25 0.0149
2015-02-12 2014-12-31 13F Atmos Energy COM 049560105 890,984 -67,770 -7.07 49,664 8.60 0.0150
2014-11-13 2014-09-30 13F Atmos Energy COMM 049560105 958,754 109,669 12.92 45,733 0.86 0.0144
2014-08-14 2014-06-30 13F ATMOS ENERGY com 049560105 849,085 -165,259 -16.29 45,342 -5.15 0.0141
2014-05-14 2014-03-31 13F ATMOS ENERGY COMM 049560105 1,014,344 277,885 37.73 47,806 42.92 0.0150
2014-02-21 2013-12-31 13F/A-1 ATMOS ENERGY COM 049560105 736,459 10,480 1.44 33,450 8.19 0.0107
2014-02-12 2013-12-31 13F ATMOS ENERGY COM 049560105 736,459 33,450
2013-11-13 2013-09-30 13F ATMOS ENERGY COM 049560105 725,979 24,194 3.45 30,919 7.30 0.0109
2013-08-09 2013-06-30 13F ATMOS ENERGY COM 049560105 701,785 701,785 28,815 0.0104
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.