Core & Main, Inc.
US ˙ NYSE ˙ US21874C1027

SecurityCNM / Core & Main, Inc.
InstitutionSimplex Trading, Llc
Latest Disclosed Ownership9,116 shares
Latest Disclosed Value $ 450,330
Simplex Trading, Llc ownership in CNM / Core & Main, Inc.

On May 14, 2026 - Simplex Trading, Llc filed a 13F-HR form disclosing ownership of 9,116 shares of Core & Main, Inc. (US:CNM) valued at $450,330 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2025 disclosing 0 shares of Core & Main, Inc.. The current value of the position is $475,126 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.

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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)
2026-05-14 2026-03-31 13F CORE & MAIN COM 21874C102 9,116 9,116 450 0.0001
2025-02-11 2024-12-31 13F CORE & MAIN COM 21874C102 0 -100.00 0
2024-11-08 2024-09-30 13F CORE & MAIN COM 21874C102 7,052 7,052 0 0.0002
2024-04-25 2024-03-31 13F CORE & MAIN COM 21874C102 0 -14,493 -100.00 0 0.0000
2024-02-02 2023-12-31 13F CORE & MAIN COM 21874C102 14,493 -12,790 -46.88 1 0.0004
2023-11-01 2023-09-30 13F CORE & MAIN COM 21874C102 27,283 27,283 1 0.0006
2023-08-04 2023-06-30 13F CORE & MAIN COM 21874C102 0 -306 -100.00 0 0.0000
2023-04-27 2023-03-31 13F CORE & MAIN COM 21874C102 306 -515 -62.73 0 0.0000
2023-02-02 2022-12-31 13F CORE & MAIN COM 21874C102 821 475 137.28 0 -100.00 0.0000
2022-11-04 2022-09-30 13F CORE & MAIN COM 21874C102 346 346 7 0.0000
2022-05-02 2022-03-31 13F CORE & MAIN COM 21874C102 0 -721 -100.00 0 -100.00
2022-02-23 2021-12-31 13F/A-1 CORE & MAIN COM 21874C102 721 721 21 0.0000
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.