Comparable stake leader
BlackRock, Inc.
SEC ownership of Core & Main, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001856525.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
23 Jun 2026
- Public ticker
- CNM on NYSE
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
23 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001856525
- Issuer location
- St. Louis, MO
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Core & Main, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
23 Jun 2026
13F
13D/G
3/4/5
Lead comparable stake: 10%
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 10%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
10%
Select Equity Group, L.P.
4.1%
MORGAN STANLEY
2.7%
Bhavani Amirthalingam
0.01%
Kathleen M. Mazzarella
0.01%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
13D/G
Company
|
10%
from 13D/G
|
$948,777,609
19,206,024 shares
|
— | 31 Mar 2026 |
| Select Equity Group, L.P. |
13D/G
13F
Company
|
4.1%
|
$440,489,433
7,778,376 shares
|
-$108,397,182 | 31 Dec 2025 |
| MORGAN STANLEY |
13F
13D/G
Company
|
2.7%
from 13D/G
|
$268,522,771
5,435,680 shares
|
— | 31 Mar 2026 |
| Bhavani Amirthalingam |
3/4/5
Director
|
0.01%
|
$886,977
17,955 shares
|
— | 23 Jun 2026 |
| Kathleen M. Mazzarella |
3/4/5
Director
|
0.01%
|
$831,845
16,839 shares
|
— | 23 Jun 2026 |
| Robert M. Buck |
3/4/5
Director
|
0.01%
|
$782,940
15,849 shares
|
— | 23 Jun 2026 |
| James D. Hope |
3/4/5
Director
|
0.01%
|
$481,057
9,738 shares
|
+$99,971 | 23 Jun 2026 |
| Jackie M. Burkhardt |
3/4/5
General Counsel and CCO
|
0%
|
$314,470
6,051 shares
|
— | 01 Apr 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$26,506,664.
Buys
$99,971
Insiders: 1
Sells
$26,606,635
Insiders: 5
Net
-$26,506,664
Shares: -425,984
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 1,972
Shares: 427,956
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 1,972 | 5,000 | $99,971 | $262,724 | -$162,754 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 422,956 | $0 | $26,343,910 | -$26,343,910 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 26 reporting-owner rows connected to Core & Main, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
26
Largest Forms 3/4/5 holder
Mark G. Whittenburg
Net 12M change
-$26,506,663
Latest report
23 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Mark G. Whittenburg | General Counsel and Secretary | $16,872,241 | Mixed | 11 Mar 2026 | ||
| Dennis G. Gipson | Director | $12,484,721 | Mixed | 23 Jun 2026 | ||
| John W. Stephens | Chief Accounting Officer | $6,693,803 | Mixed | 11 Mar 2026 | ||
| LeClair Stephen O | Executive Chair, Director | $3,868,956 | -$7,767,601 | -67% | Mixed | 09 Mar 2026 |
| Margaret M. Newman | Director | $3,049,374 | Mixed | 23 Jun 2026 | ||
| Mark R. Witkowski | Chief Executive Officer, Director | $2,990,461 | -$12,534,598 | -81% | Mixed | 11 Mar 2026 |
| Bradford A. Cowles | President | $1,491,223 | Mixed | 11 Mar 2026 | ||
| Michael G. Huebert | President | $1,482,214 | Mixed | 11 Mar 2026 | ||
| John R. Schaller | Executive Vice President | $1,082,895 | Filing P/S | 28 May 2025 | ||
| Bhavani Amirthalingam | Director | $886,977 | Median | 23 Jun 2026 | ||
| Kathleen M. Mazzarella | Director | $831,845 | Median | 23 Jun 2026 | ||
| Orvin T. Kimbrough | Director | $827,943 | -$1,480,094 | -64% | Median | 23 Jun 2026 |
| Robert M. Buck | Director | $782,940 | Median | 23 Jun 2026 | ||
| Laura K. Schneider | Chief Human Resources Officer | $724,092 | Filing P/S | 03 Jun 2025 | ||
| Robyn L. Bradbury | Chief Financial Officer | $661,607 | -$2,097,558 | -76% | Mixed | 17 Apr 2026 |
| Carla D. Harper | Senior VP, Human Resources | $657,316 | Median | 22 Jun 2026 | ||
| Jeffrey D. Giles | EVP, Corporate Development | $566,338 | Mixed | 12 Mar 2026 | ||
| James D. Hope | Director | $481,057 | +$99,971 | +26% | Median | 23 Jun 2026 |
| James G. Castellano | Director | $367,387 | -$2,726,783 | -88% | Median | 23 Jun 2026 |
| Jackie M. Burkhardt | General Counsel and CCO | $314,470 | Mixed | 01 Apr 2026 |
Recent insider transactions for Core & Main, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| James G. Castellano | CNM | Class A Common Stock | Award | 60.4% | 2,799 | 7,437 | 23 Jun 2026 | Direct | ||
| Margaret M. Newman | CNM | Class A Common Stock | Award | 20% | 2,799 | 16,757 | 23 Jun 2026 | Direct | ||
| M. Susan Hardwick | CNM | Class A Common Stock | Award | 482.6% | 2,799 | 3,379 | 23 Jun 2026 | Direct | ||
| Kathleen M. Mazzarella | CNM | Class A Common Stock | Award | 20% | 2,799 | 16,757 | 23 Jun 2026 | Direct | ||
| James D. Hope | CNM | Class A Common Stock | Award | 40.3% | 2,799 | 9,738 | 23 Jun 2026 | Direct | ||
| Bhavani Amirthalingam | CNM | Class A Common Stock | Award | 18.5% | 2,799 | 17,955 | 23 Jun 2026 | Direct | ||
| Dennis G. Gipson | CNM | Class A Common Stock | Award | 20% | 2,799 | 16,757 | 23 Jun 2026 | Direct | ||
| Orvin T. Kimbrough | CNM | Class A Common Stock | Award | 20% | 2,799 | 16,757 | 23 Jun 2026 | Direct | ||
| Robert M. Buck | CNM | Class A Common Stock | Award | 21.4% | 2,799 | 15,849 | 23 Jun 2026 | Direct | ||
| Carla D. Harper | CNM | Class A Common Stock | Tax liability | -4.09% | -568 | 13,306 | 22 Jun 2026 | Direct | ||
| Robyn L. Bradbury | CNM | Class A Common Stock | Sale | -28.6% | $262,724 | $52.54 | -5,000 | 12,500 | 17 Apr 2026 | Direct |
| Robyn L. Bradbury | CNM | Class A Common Stock | Conversion of derivative security | 40% | 5,000 | 17,500 | 17 Apr 2026 | Direct | ||
| Robyn L. Bradbury | CNM | Class B Common Stock and Limited Partnership Interests | Conversion of derivative security | -100% | -5,000 | 0 | 17 Apr 2026 | Direct | ||
| Robyn L. Bradbury | CNM | Class B Common Stock and Limited Partnership Interests | Other | 5,000 | 5,000 | 17 Apr 2026 | Direct | |||
| Robyn L. Bradbury | CNM | Class B Common Stock and Limited Partnership Interests | Other | -3.18% | -5,000 | 152,447 | 17 Apr 2026 | By LLC | ||
| James D. Hope | CNM | Class A Common Stock | Purchase | 39.7% | $99,971 | $50.70 | 1,972 | 6,939 | 07 Apr 2026 | Direct |
| M. Susan Hardwick | CNM | Class A Common Stock | Award | 580 | 580 | 01 Apr 2026 | Direct | |||
| Jeffrey D. Giles | CNM | Class A Common Stock | Award | 45.4% | 3,021 | 9,681 | 12 Mar 2026 | Direct | ||
| Jeffrey D. Giles | CNM | Options (Rights to Buy) | Award | 21,585 | 21,585 | 12 Mar 2026 | Direct | |||
| Robyn L. Bradbury | CNM | Class A Common Stock | Award | 62.8% | 4,824 | 12,500 | 12 Mar 2026 | Direct | ||
| Robyn L. Bradbury | CNM | Options (Rights to Buy) | Award | 34,488 | 34,488 | 12 Mar 2026 | Direct | |||
| Mark R. Witkowski | CNM | Class A Common Stock | Award | 56.1% | 18,372 | 51,119 | 12 Mar 2026 | Direct | ||
| Mark R. Witkowski | CNM | Options (Rights to Buy) | Award | 131,382 | 131,382 | 12 Mar 2026 | Direct | |||
| Bradford A. Cowles | CNM | Class A Common Stock | Award | 38.5% | 7,086 | 25,491 | 12 Mar 2026 | Direct | ||
| Bradford A. Cowles | CNM | Options (Rights to Buy) | Award | 50,676 | 50,676 | 12 Mar 2026 | Direct | |||
| John W. Stephens | CNM | Class A Common Stock | Award | 5.69% | 936 | 17,374 | 12 Mar 2026 | Direct | ||
| John W. Stephens | CNM | Options (Rights to Buy) | Award | 6,684 | 6,684 | 12 Mar 2026 | Direct | |||
| Michael G. Huebert | CNM | Class A Common Stock | Award | 70.8% | 10,500 | 25,337 | 12 Mar 2026 | Direct | ||
| Michael G. Huebert | CNM | Options (Rights to Buy) | Award | 37,539 | 37,539 | 12 Mar 2026 | Direct | |||
| Carla D. Harper | CNM | Class A Common Stock | Award | 21.6% | 2,463 | 13,874 | 12 Mar 2026 | Direct | ||
| Carla D. Harper | CNM | Options (Rights to Buy) | Award | 17,598 | 17,598 | 12 Mar 2026 | Direct | |||
| Mark G. Whittenburg | CNM | Class A Common Stock | Tax liability | -3.74% | -331 | 8,525 | 11 Mar 2026 | Direct | ||
| Robyn L. Bradbury | CNM | Class A Common Stock | Tax liability | -5% | -404 | 7,676 | 11 Mar 2026 | Direct | ||
| Mark R. Witkowski | CNM | Class A Common Stock | Tax liability | -4.89% | -1,685 | 32,747 | 11 Mar 2026 | Direct | ||
| Bradford A. Cowles | CNM | Class A Common Stock | Tax liability | -3.19% | -607 | 18,405 | 11 Mar 2026 | Direct | ||
| John W. Stephens | CNM | Class A Common Stock | Tax liability | -0.65% | -107 | 16,438 | 11 Mar 2026 | Direct | ||
| Michael G. Huebert | CNM | Class A Common Stock | Tax liability | -2.92% | -447 | 14,837 | 11 Mar 2026 | Direct | ||
| Carla D. Harper | CNM | Class A Common Stock | Tax liability | -0.77% | -89 | 11,411 | 11 Mar 2026 | Direct | ||
| Mark G. Whittenburg | CNM | Class A Common Stock | Tax liability | -5.92% | -557 | 8,856 | 10 Mar 2026 | Direct | ||
| Carla D. Harper | CNM | Class A Common Stock | Tax liability | -1.62% | -189 | 11,500 | 10 Mar 2026 | Direct | ||
| John W. Stephens | CNM | Class A Common Stock | Tax liability | -1.18% | -198 | 16,545 | 10 Mar 2026 | Direct | ||
| Bradford A. Cowles | CNM | Class A Common Stock | Tax liability | -3.75% | -741 | 19,012 | 10 Mar 2026 | Direct | ||
| Mark R. Witkowski | CNM | Class A Common Stock | Tax liability | -2.65% | -937 | 34,432 | 10 Mar 2026 | Direct | ||
| Stephen O LeClair | CNM | Class A Common Stock | Tax liability | -4.45% | -3,081 | 66,136 | 10 Mar 2026 | Direct | ||
| Robyn L. Bradbury | CNM | Class A Common Stock | Tax liability | -2.47% | -205 | 8,080 | 10 Mar 2026 | Direct | ||
| Mark G. Whittenburg | CNM | Class A Common Stock | Tax liability | -2.87% | -278 | 9,413 | 09 Mar 2026 | Direct | ||
| Carla D. Harper | CNM | Class A Common Stock | Tax liability | -0.65% | -77 | 11,689 | 09 Mar 2026 | Direct | ||
| John W. Stephens | CNM | Class A Common Stock | Tax liability | -0.56% | -94 | 16,743 | 09 Mar 2026 | Direct | ||
| Michael G. Huebert | CNM | Class A Common Stock | Tax liability | -2.24% | -350 | 15,284 | 09 Mar 2026 | Direct | ||
| Bradford A. Cowles | CNM | Class A Common Stock | Tax liability | -2.15% | -435 | 19,753 | 09 Mar 2026 | Direct |
* marks a reported price that did not pass the local price check.