The Williams Companies, Inc.
MX ˙ BMV ˙ US9694571004
SecurityMX:WMB / The Williams Companies, Inc.
InstitutionCastleark Management Llc
Latest Disclosed Ownership131,770 shares
Latest Disclosed Value $ 9,590,221
Castleark Management Llc reports 4.80% increase in ownership of WMB / The Williams Companies, Inc.

On May 15, 2026 - Castleark Management Llc filed a 13F-HR form disclosing ownership of 131,770 shares of The Williams Companies, Inc. (MX:WMB) valued at $9,590,221 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 125,730 shares of The Williams Companies, Inc.. This represents a change in shares of 4.80% 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 WILLIAMS COS COM 969457100 131,770 6,040 4.80 9,590 26.90 0.3173
2026-02-12 2025-12-31 13F WILLIAMS COS COM 969457100 125,730 19,090 17.90 7,558 11.87 0.2219
2025-11-17 2025-09-30 13F WILLIAMS COS COM 969457100 106,640 0 0.00 6,756 0.85 0.1894
2025-08-18 2025-06-30 13F WILLIAMS COS COM 969457100 106,640 36,530 52.10 6,698 59.89 0.2013
2025-05-15 2025-03-31 13F WILLIAMS COS COM 969457100 70,110 44,540 174.19 4,190 202.89 0.1452
2025-02-18 2024-12-31 13F WILLIAMS COS COM 969457100 25,570 0 0.00 1,384 18.51 0.0483
2024-11-15 2024-09-30 13F WILLIAMS COS COM 969457100 25,570 0 0.00 1,167 7.46 0.0476
2024-08-14 2024-06-30 13F WILLIAMS COS COM 969457100 25,570 0 0.00 1,087 9.04 0.0444
2024-05-16 2024-03-31 13F WILLIAMS COS COM 969457100 25,570 0 0.00 996 11.91 0.0415
2024-02-15 2023-12-31 13F WILLIAMS COS COM 969457100 25,570 0 0.00 891 3.37 0.0395
2023-11-15 2023-09-30 13F WILLIAMS COS COM 969457100 25,570 14,340 127.69 861 135.25 0.0439
2023-08-16 2023-06-30 13F WILLIAMS COS COM 969457100 11,230 -3,660 -24.58 366 -17.57 0.0166
2023-05-16 2023-03-31 13F WILLIAMS COS COM 969457100 14,890 -5,520 -27.05 445 -33.83 0.0218
2023-02-10 2022-12-31 13F WILLIAMS COS COM 969457100 20,410 0 0.00 671 14.90 0.0351
2022-11-15 2022-09-30 13F WILLIAMS COS COM 969457100 20,410 -5,100 -19.99 584 -26.63 0.0325
2022-08-16 2022-06-30 13F WILLIAMS COS COM 969457100 25,510 0 0.00 796 -6.57 0.0426
2022-05-16 2022-03-31 13F WILLIAMS COS COM 969457100 25,510 0 0.00 852 28.31 0.0368
2022-02-16 2021-12-31 13F WILLIAMS COS COM 969457100 25,510 -8,700 -25.43 664 -25.14 0.0244
2021-11-12 2021-09-30 13F WILLIAMS COS COM 969457100 34,210 0 0.00 887 -2.31 0.0339
2021-08-17 2021-06-30 13F WILLIAMS COS COM 969457100 34,210 0 0.00 908 12.10 0.0305
2021-05-14 2021-03-31 13F WILLIAMS COS COM 969457100 34,210 -1,350 -3.80 810 13.60 0.0292
2021-02-17 2020-12-31 13F WILLIAMS COS COM 969457100 35,560 25,050 238.34 713 244.44 0.0267
2020-11-16 2020-09-30 13F WILLIAMS COS COM 969457100 10,510 0 0.00 207 3.50 0.0081
2020-08-14 2020-06-30 13F WILLIAMS COS COM 969457100 10,510 0 0.00 200 34.23 0.0087
2020-05-13 2020-03-31 13F WILLIAMS COS COM 969457100 10,510 10,510 149 0.0088
2020-02-14 2019-12-31 13F WILLIAMS COS INC DEL COM 969457100 0 -26,268 -100.00 0 -100.00
2019-11-15 2019-09-30 13F WILLIAMS COS INC DEL COM 969457100 26,268 -70,513 -72.86 632 -76.71 0.0258
2019-08-13 2019-06-30 13F WILLIAMS COS INC DEL COM 969457100 96,781 0 0.00 2,714 -2.37 0.1041
2019-05-14 2019-03-31 13F WILLIAMS COS INC DEL COM 969457100 96,781 0 0.00 2,780 30.27 0.1046
2019-02-12 2018-12-31 13F WILLIAMS COS INC DEL COM 969457100 96,781 0 0.00 2,134 -18.89 0.0909
2018-11-14 2018-09-30 13F WILLIAMS COS INC DEL COM 969457100 96,781 96,781 2,631 0.0756
2018-08-15 2018-06-30 13F WILLIAMS COS INC DEL COM 969457100 0 -34,870 -100.00 0 -100.00
2018-05-14 2018-03-31 13F WILLIAMS COS INC DEL COM 969457100 34,870 34,870 867 0.0275
2017-05-15 2017-03-31 13F WILLIAMS COS INC DEL COM 969457100 0 -224,400 -100.00 0 -100.00
2017-02-15 2016-12-31 13F WILLIAMS COS INC DEL COM 969457100 224,400 -138,200 -38.11 6,988 -37.29 0.2229
2016-11-15 2016-09-30 13F WILLIAMS COS INC DEL COM 969457100 362,600 362,600 0.00 11,143 0.3370
2015-11-17 2015-09-30 13F WILLIAMS COS INC DEL COM 969457100 0 -102,245 -100.00 0 -100.00
2015-08-17 2015-06-30 13F WILLIAMS COS INC DEL COM 969457100 102,245 -101,070 -49.71 5,868 -42.95 0.1568
2015-05-15 2015-03-31 13F WILLIAMS COS INC DEL COM 969457100 203,315 45,630 28.94 10,286 45.16 0.2481
2015-02-10 2014-12-31 13F WILLIAMS COS INC DEL COM 969457100 157,685 157,685 0.00 7,086 0.1826
2014-11-17 2014-09-30 13F WILLIAMS COS INC DEL COM 969457100 0 -150,600 -100.00 0 -100.00
2014-08-15 2014-06-30 13F WILLIAMS COS INC COM 969457100 150,600 150,600 0.00 8,766 0.2416
2014-05-20 2014-03-31 13F WILLIAMS COS INC DEL COM 969457100 0 0 0 0.0000
2014-02-20 2013-12-31 13F WILLIAMS COS INC DEL COM 969457100 0 -150,600 -100.00 0 -100.00
2014-11-21 2013-09-30 13F/A-1 WILLIAMS COS INC DEL COM 969457100 150,600 150,600 8,336 0.2350
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.