The Williams Companies, Inc.
MX ˙ BMV ˙ US9694571004
SecurityMX:WMB / The Williams Companies, Inc.
InstitutionCustom Index Systems, Llc
Latest Disclosed Ownership22,471 shares
Latest Disclosed Value $ 1,635,439
Custom Index Systems, Llc reports 0.13% decrease in ownership of WMB / The Williams Companies, Inc.

On May 1, 2026 - Custom Index Systems, Llc filed a 13F-HR/A form disclosing ownership of 22,471 shares of The Williams Companies, Inc. (MX:WMB) valued at $1,635,439 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 22,501 shares of The Williams Companies, Inc.. This represents a change in shares of -0.13% 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)
2026-05-01 2026-03-31 13F/A-1 WILLIAMS COS COM 969457100 22,471 -30 -0.13 1,635 20.93 0.7124
2026-04-29 2026-03-31 13F WILLIAMS COS COM 969457100 22,471 -30 1,635 0.7112
2026-02-12 2025-12-31 13F WILLIAMS COS COM 969457100 22,501 -9,697 -30.12 1,353 -33.69 0.5973
2025-10-29 2025-09-30 13F WILLIAMS COS COM 969457100 32,198 12,782 65.83 2,040 67.27 0.6062
2025-08-13 2025-06-30 13F WILLIAMS COS COM 969457100 19,416 -224 -1.14 1,220 3.92 0.5819
2025-05-14 2025-03-31 13F WILLIAMS COS COM 969457100 19,640 803 4.26 1,174 15.11 0.5950
2025-01-23 2024-12-31 13F WILLIAMS COS COM 969457100 18,837 4,266 29.28 1,019 53.23 0.5473
2024-10-24 2024-09-30 13F WILLIAMS COS COM 969457100 14,571 6,809 87.72 665 102.13 0.3603
2024-08-06 2024-06-30 13F WILLIAMS COS COM 969457100 7,762 7,762 330 0.1894
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.