The Williams Companies, Inc.
MX ˙ BMV ˙ US9694571004
SecurityMX:WMB / The Williams Companies, Inc.
InstitutionCalamos Advisors LLC
Latest Disclosed Ownership580,346 shares
Latest Disclosed Value $ 42,237,582
Calamos Advisors LLC reports 2.32% increase in ownership of WMB / The Williams Companies, Inc.

On May 4, 2026 - Calamos Advisors LLC filed a 13F-HR form disclosing ownership of 580,346 shares of The Williams Companies, Inc. (MX:WMB) valued at $42,237,582 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 567,209 shares of The Williams Companies, Inc.. This represents a change in shares of 2.32% 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)
2026-05-04 2026-03-31 13F WILLIAMS COS COM 969457100 580,346 13,137 2.32 42,238 23.88 0.1490
2026-01-29 2025-12-31 13F WILLIAMS COS COM 969457100 567,209 -8,818 -1.53 34,095 -6.57 0.1281
2025-10-20 2025-09-30 13F WILLIAMS COS COM 969457100 576,027 1,662 0.29 36,491 1.15 0.1348
2025-08-08 2025-06-30 13F WILLIAMS COS COM 969457100 574,365 63,452 12.42 36,076 18.15 0.1420
2025-04-29 2025-03-31 13F WILLIAMS COS COM 969457100 510,913 110,831 27.70 30,532 41.01 0.1329
2025-01-24 2024-12-31 13F WILLIAMS COS COM 969457100 400,082 144,953 56.82 21,652 85.92 0.0906
2024-11-07 2024-09-30 13F WILLIAMS COS COM 969457100 255,129 -6,260 -2.39 11,647 4.83 0.0504
2024-07-25 2024-06-30 13F WILLIAMS COS COM 969457100 261,389 -9,540 -3.52 11,109 5.22 0.0493
2024-05-08 2024-03-31 13F WILLIAMS COS COM 969457100 270,929 -6,814 -2.45 10,558 9.15 0.0500
2024-01-31 2023-12-31 13F WILLIAMS COS COM 969457100 277,743 -3,628 -1.29 9,674 2.05 0.0469
2023-10-26 2023-09-30 13F WILLIAMS COS COM 969457100 281,371 0 0.00 9,479 3.25 0.0492
2023-07-28 2023-06-30 13F WILLIAMS COS COM 969457100 281,371 0 0.00 9,181 9.28 0.0454
2023-05-04 2023-03-31 13F WILLIAMS COS COM 969457100 281,371 -69,042 -19.70 8,402 -27.13 0.0410
2023-01-26 2022-12-31 13F WILLIAMS COS COM 969457100 350,413 -55,967 -13.77 11,529 -0.92 0.0541
2022-10-24 2022-09-30 13F WILLIAMS COS COM 969457100 406,380 0 0.00 11,635 -8.26 0.0532
2022-08-01 2022-06-30 13F WILLIAMS COS COM 969457100 406,380 10,861 2.75 12,683 -4.02 0.0547
2022-05-03 2022-03-31 13F WILLIAMS COS COM 969457100 395,519 -226,685 -36.43 13,214 -18.44 0.0496
2022-02-01 2021-12-31 13F WILLIAMS COS COM 969457100 622,204 -65,838 -9.57 16,202 -9.22 0.0606
2021-10-26 2021-09-30 13F WILLIAMS COS COM 969457100 688,042 223,949 48.26 17,848 44.85 0.0780
2021-07-22 2021-06-30 13F WILLIAMS COS COM 969457100 464,093 -76,667 -14.18 12,322 -3.82 0.0563
2021-04-12 2021-03-31 13F WILLIAMS COS COM 969457100 540,760 -87,425 -13.92 12,811 1.71 0.0699
2021-01-27 2020-12-31 13F WILLIAMS COS COM 969457100 628,185 110,073 21.25 12,595 23.71 0.0731
2020-10-26 2020-09-30 13F WILLIAMS COS COM 969457100 518,112 -18,878 -3.52 10,181 -0.32 0.0655
2020-07-27 2020-06-30 13F WILLIAMS COS COM 969457100 536,990 -97,772 -15.40 10,214 13.72 0.0722
2020-04-28 2020-03-31 13F WILLIAMS COS COM 969457100 634,762 330,976 108.95 8,982 24.65 0.0705
2020-01-15 2019-12-31 13F WILLIAMS COS COMMON STOCK 969457100 303,786 -4,442 -1.44 7,206 -2.83 0.0356
2019-10-21 2019-09-30 13F WILLIAMS COS COMMON STOCK 969457100 308,228 23,807 8.37 7,416 -7.01 0.0404
2019-08-07 2019-06-30 13F WILLIAMS COS COMMON STOCK 969457100 284,421 12,466 4.58 7,975 2.10 0.0443
2019-04-12 2019-03-31 13F WILLIAMS COS COMMON STOCK 969457100 271,955 2,388 0.89 7,811 31.41 0.0487
2019-01-24 2018-12-31 13F WILLIAMS COS COMMON STOCK 969457100 269,567 35,268 15.05 5,944 -6.70 0.0392
2018-10-22 2018-09-30 13F WILLIAMS COS COMMON STOCK 969457100 234,299 89,904 62.26 6,371 62.73 0.0350
2018-07-17 2018-06-30 13F WILLIAMS COS COMMON STOCK 969457100 144,395 46,931 48.15 3,915 61.58 0.0239
2018-04-13 2018-03-31 13F WILLIAMS COMMON STOCK 969457100 97,464 4,904 5.30 2,423 -14.14 0.0158
2018-02-13 2017-12-31 13F WILLIAMS COMMON STOCK 969457100 92,560 -1,963 -2.08 2,822 -0.53 0.0144
2017-10-25 2017-09-30 13F WILLIAMS COMMON STOCK 969457100 94,523 3,461 3.80 2,837 2.90 0.0219
2017-08-09 2017-06-30 13F WILLIAMS COMMON STOCK 969457100 91,062 2,413 2.72 2,757 5.11 0.0204
2017-04-20 2017-03-31 13F WILLIAMS COMMON STOCK 969457100 88,649 -208 -0.23 2,623 -5.20 0.0207
2017-02-06 2016-12-31 13F WILLIAMS COMMON STOCK 969457100 88,857 49,991 128.62 2,767 131.74 0.0220
2016-11-14 2016-09-30 13F WILLIAMS COMMON STOCK 969457100 38,866 39 0.10 1,194 42.14 0.0085
2016-07-26 2016-06-30 13F WILLIAMS COMMON STOCK 969457100 38,827 15 0.04 840 34.62 0.0059
2016-04-25 2016-03-31 13F WILLIAMS COMMON STOCK 969457100 38,812 2,424 6.66 624 -33.26 0.0041
2016-02-05 2015-12-31 13F WILLIAMS COMMON STOCK 969457100 36,388 0 0.00 935 -30.28 0.0059
2015-11-10 2015-09-30 13F WILLIAMS COMMON STOCK 969457100 36,388 36,388 0.00 1,341 0.0092
2015-05-13 2015-03-31 13F WILLIAMS COMMON STOCK 969457100 0 -31,596 -100.00 0 -100.00
2015-02-13 2014-12-31 13F WILLIAMS COMMON STOCK 969457100 31,596 31,596 1,420 0.0094
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.