Quick Takeaways
- CNM - Core & Main, Inc. has 26 insiders with reported activity on this page.
- Net insider value flow over the last year: -$34,579,529.
- Recent transaction rows are available for direct filing-level review.
- Info
- Insider Trading
- Financials
- Holders
Insider Transactions Reported by 26 Insiders of Core & Main, Inc.
- Symbol
- CNM on NYSE
- Location
- St. Louis, MO
What Changed
- Buy value: $99,971; sell value: $34,679,499.
- Net share flow: -568,437.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Official SEC Source
Insider trading overview
Last 12 monthsNet insider flow leans to selling over the last 12 months. Net value: -$34,579,529.
Buys
$99,971
Shares: 1,972
Insiders: 1
Sells
$34,679,500
Shares: 570,409
Insiders: 9
Net
-$34,579,529
Shares: -568,437
Insiders: -8
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 1,972 | 0 | $99,971 | $0 | +$99,971 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 272,956 | $0 | $17,064,026 | -$17,064,026 |
| 9-12 | 0 | 297,453 | $0 | $17,615,474 | -$17,615,474 |
Core & Main, Inc. executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Mark G. Whittenburg | General Counsel and Secretary | $16,872,241 | -$3,001,255 | -15% | Mixed | 11 Mar 2026 |
| Dennis G. Gipson | Director | $12,399,910 | Mixed | 24 Jun 2025 | ||
| John W. Stephens | Chief Accounting Officer | $6,693,803 | -$2,225,371 | -25% | Mixed | 11 Mar 2026 |
| Stephen O LeClair | Executive Chair, Director | $3,868,956 | -$7,767,601 | -67% | Mixed | 09 Mar 2026 |
| Mark R. Witkowski | Chief Executive Officer, Director | $2,990,461 | -$12,534,598 | -81% | Mixed | 11 Mar 2026 |
| Margaret M. Newman | Director | $2,964,563 | Mixed | 24 Jun 2025 | ||
| 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 | -$538,670 | -33% | Filing P/S | 28 May 2025 |
| Orvin T. Kimbrough | Director | $862,344 | -$1,480,094 | -63% | Mixed | 18 Jul 2025 |
| Carla D. Harper | Senior VP, Human Resources | $811,629 | Mixed | 11 Mar 2026 | ||
| Bhavani Amirthalingam | Director | $806,753 | Mixed | 24 Jun 2025 | ||
| Kathleen M. Mazzarella | Director | $747,348 | Mixed | 24 Jun 2025 | ||
| Robyn L. Bradbury | Chief Financial Officer | $732,537 | -$1,834,834 | -71% | Mixed | 11 Mar 2026 |
| Laura K. Schneider | Chief Human Resources Officer | $724,092 | -$2,570,293 | -78% | Filing P/S | 03 Jun 2025 |
| Robert M. Buck | Director | $694,651 | Mixed | 24 Jun 2025 | ||
| Jeffrey D. Giles | EVP, Corporate Development | $566,338 | Mixed | 12 Mar 2026 | ||
| James D. Hope | Director | $351,772 | +$99,971 | +40% | Filing P/S | 07 Apr 2026 |
| Jackie M. Burkhardt | General Counsel and CCO | $314,470 | Mixed | 01 Apr 2026 | ||
| James G. Castellano | Director | $279,903 | -$2,726,783 | -91% | Mixed | 18 Jul 2025 |
| M. Susan Hardwick | Director | $30,142 | Mixed | 01 Apr 2026 | ||
| CD&R Investment Associates X, Ltd. | 10%+ Owner | Mixed | 25 Jan 2024 | |||
| Ian A. Rorick | Director | Mixed | 23 Jul 2021 | |||
| Nathan K. Sleeper | Director | Mixed | 10 Jan 2024 | |||
| James G. Berges | Director | Mixed | 23 Jul 2021 | |||
| Jonathan L. Zrebiec | Director | Mixed | 23 Jul 2021 |
Top shareholders of Core & Main, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
13D/G
|
Company |
10%
from 13D/G
|
18,928,518
|
$983,715,080 | — | 31 Dec 2025 | |
| VANGUARD GROUP INC |
13F
|
Company |
9.4%
|
17,598,217
|
$914,579,338 | — | 31 Dec 2025 | |
| MORGAN STANLEY |
13F
13D/G
|
Company |
6.5%
from 13D/G
|
14,586,859
|
$758,079,190 | — | 31 Dec 2025 | |
| Select Equity Group, L.P. |
13D/G
13F
|
Company |
4.1%
|
7,778,376
|
$440,489,433 | -$108,397,182 | 31 Dec 2025 | |
| Pictet Asset Management Holding SA |
13F
|
Company |
4%
|
7,441,427
|
$386,781,723 | — | 31 Dec 2025 | |
| FMR LLC |
13F
|
Company |
3.4%
|
6,354,620
|
$330,249,594 | — | 31 Dec 2025 | |
| Capital World Investors |
13F
|
Company |
3.3%
|
6,292,740
|
$327,033,698 | — | 31 Dec 2025 | |
| STATE STREET CORP |
13F
|
Company |
3%
|
5,733,516
|
$297,970,827 | — | 31 Dec 2025 | |
| ROYAL LONDON ASSET MANAGEMENT LTD |
13F
|
Company |
3%
|
5,688,595
|
$295,636,282 | — | 31 Dec 2025 | |
| FIRST TRUST ADVISORS LP |
13F
|
Company |
2.8%
|
5,318,070
|
$276,380,155 | — | 31 Dec 2025 | |
| JANUS HENDERSON GROUP PLC |
13F
|
Company |
2.5%
|
4,623,727
|
$240,273,303 | — | 31 Dec 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
1.9%
|
3,645,108
|
$189,474,232 | — | 31 Dec 2025 | |
| Amundi |
13F
|
Individual |
1.6%
|
3,062,369
|
$159,137,679 | — | 31 Dec 2025 | |
| Invesco Ltd. |
13F
|
Company |
1.6%
|
2,917,310
|
$151,612,599 | — | 31 Dec 2025 | |
| Impax Asset Management Group plc |
13F
|
Company |
1.5%
|
2,872,595
|
$149,288,762 | — | 31 Dec 2025 | |
| SAMLYN CAPITAL, LLC |
13F
|
Company |
1.5%
|
2,841,675
|
$147,681,849 | — | 31 Dec 2025 | |
| D1 Capital Partners L.P. |
13F
|
Company |
1.4%
|
2,647,789
|
$137,605,594 | — | 31 Dec 2025 | |
| KBC Group NV |
13F
|
Company |
1.4%
|
2,618,916
|
$136,105,000 | — | 31 Dec 2025 | |
| FIDUCIARY MANAGEMENT INC /WI/ |
13F
|
Company |
1.4%
|
2,612,944
|
$135,794,700 | — | 31 Dec 2025 | |
| BESSEMER GROUP INC |
13F
|
Company |
1.4%
|
2,590,449
|
$134,626,000 | — | 31 Dec 2025 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
1.3%
|
2,508,945
|
$130,405,681 | — | 31 Dec 2025 | |
| D. E. Shaw & Co., Inc. |
13F
|
Company |
1.3%
|
2,477,349
|
$128,747,827 | — | 31 Dec 2025 | |
| SPRUCE HOUSE INVESTMENT MANAGEMENT LLC |
13F
|
Company |
1.1%
|
2,150,000
|
$111,735,500 | — | 31 Dec 2025 | |
| NORGES BANK |
13F
|
Company |
1.1%
|
2,083,218
|
$108,264,839 | — | 31 Dec 2025 | |
| Forest Avenue Capital Management LP |
13F
|
Company |
1%
|
1,879,883
|
$97,697,520 | — | 31 Dec 2025 | |
| JPMORGAN CHASE & CO |
13F
|
Company |
0.99%
|
1,865,756
|
$96,963,391 | — | 31 Dec 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
0.99%
|
1,860,557
|
$96,693,147 | — | 31 Dec 2025 | |
| RAYMOND JAMES FINANCIAL INC |
13F
|
Company |
0.95%
|
1,783,112
|
$93,958,644 | — | 31 Dec 2025 | |
| ALLIANCEBERNSTEIN L.P. |
13F
|
Company |
0.95%
|
1,790,499
|
$93,052,233 | — | 31 Dec 2025 | |
| Camrose Capital Investment Partners LLP |
13F
|
Company |
0.92%
|
1,737,226
|
$90,283,635 | — | 31 Dec 2025 | |
| Liontrust Investment Partners LLP |
13F
|
Company |
0.92%
|
1,730,797
|
$89,949,520 | — | 31 Dec 2025 | |
| FERNBRIDGE CAPITAL MANAGEMENT LP |
13F
|
Company |
0.82%
|
1,546,500
|
$80,371,605 | — | 31 Dec 2025 | |
| Holocene Advisors, LP |
13F
|
Company |
0.81%
|
1,524,113
|
$79,208,153 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.81%
|
1,517,763
|
$78,878,143 | — | 31 Dec 2025 | |
| Handelsbanken Fonder AB |
13F
|
Company |
0.76%
|
1,426,831
|
$74,152,000 | — | 31 Dec 2025 | |
| AMF Tjanstepension AB |
13F
|
Company |
0.71%
|
1,342,563
|
$69,772,999 | — | 31 Dec 2025 | |
| Hood River Capital Management LLC |
13F
|
Company |
0.71%
|
1,330,800
|
$69,161,676 | — | 31 Dec 2025 | |
| CDAM (UK) Ltd |
13F
|
Company |
0.68%
|
1,276,582
|
$66,343,966 | — | 31 Dec 2025 | |
| Interval Partners, LP |
13F
|
Company |
0.65%
|
1,228,528
|
$63,846,600 | — | 31 Dec 2025 | |
| FIL Ltd |
13F
|
Company |
0.59%
|
1,107,618
|
$57,562,907 | — | 31 Dec 2025 | |
| Bank of New York Mellon Corp |
13F
|
Company |
0.58%
|
1,093,724
|
$56,840,856 | — | 31 Dec 2025 | |
| Swedbank AB |
13F
|
Company |
0.58%
|
1,084,200
|
$56,345,874 | — | 31 Dec 2025 | |
| TRUIST FINANCIAL CORP |
13F
|
Company |
0.49%
|
917,412
|
$47,677,907 | — | 31 Dec 2025 | |
| ACK Asset Management LLC |
13F
|
Company |
0.48%
|
900,000
|
$46,773,000 | — | 31 Dec 2025 | |
| DENDUR CAPITAL LP |
13F
|
Company |
0.48%
|
898,000
|
$46,669,060 | — | 31 Dec 2025 | |
| Pembroke Management, LTD |
13F
|
Company |
0.48%
|
895,855
|
$46,557,584 | — | 31 Dec 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
0.47%
|
882,941
|
$45,886,444 | — | 31 Dec 2025 | |
| Robeco Schweiz AG |
13F
|
Company |
0.44%
|
818,544
|
$42,539,732 | — | 31 Dec 2025 | |
| Hill City Capital, LP |
13F
|
Company |
0.42%
|
797,000
|
$41,420,090 | — | 31 Dec 2025 | |
| MACKENZIE FINANCIAL CORP |
13F
|
Company |
0.41%
|
769,524
|
$40,597,012 | — | 31 Dec 2025 |
Recent Insider Transactions by Companies or Individuals for Core & Main, Inc.
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | ||
| Mark R. Witkowski | CNM | Class A Common Stock | Tax liability | -1.33% | -478 | 35,369 | 09 Mar 2026 | Direct | ||
| Stephen O LeClair | CNM | Class A Common Stock | Tax liability | -2.15% | -1,519 | 69,217 | 09 Mar 2026 | Direct | ||
| Robyn L. Bradbury | CNM | Class A Common Stock | Tax liability | -3.16% | -270 | 8,285 | 09 Mar 2026 | Direct | ||
| Jeffrey D. Giles | CNM | Class A Common Stock | Award | 191.7% | 4,377 | 6,660 | 26 Jan 2026 | Direct | ||
| Jeffrey D. Giles | CNM | Options (Rights to Buy) | Award | 10,617 | 10,617 | 26 Jan 2026 | Direct | |||
| Mark G. Whittenburg | CNM | Class B Common Stock and Limited Partnership Interests | Gift | -10.1% | -25,500 | 227,312 | 31 Dec 2025 | By LLC | ||
| John W. Stephens | CNM | Class A Common Stock | Options Exercise | 308.7% | 12,717 | 16,837 | 12 Sep 2025 | Direct | ||
| John W. Stephens | CNM | Options (Rights to Buy) | Options Exercise | -100% | -12,717 | 0 | 12 Sep 2025 | Direct | ||
| Carla D. Harper | CNM | Class A Common Stock | Award | 21.6% | 2,091 | 11,766 | 03 Sep 2025 | Direct | ||
| Mark R. Witkowski | CNM | Class A Common Stock | Sale | -73.6% | $6,408,210 | $64.08 | -100,000 | 35,847 | 18 Aug 2025 | Direct |
| Mark R. Witkowski | CNM | Class A Common Stock | Conversion of derivative security | 279% | 100,000 | 135,847 | 18 Aug 2025 | Direct | ||
| Mark R. Witkowski | CNM | Class B Common Stock and Limited Partnership Interests | Conversion of derivative security | -100% | -100,000 | 0 | 18 Aug 2025 | Direct | ||
| Mark R. Witkowski | CNM | Class B Common Stock and Limited Partnership Interests | Other | 100,000 | 100,000 | 18 Aug 2025 | Direct | |||
| Mark R. Witkowski | CNM | Class B Common Stock and Limited Partnership Interests | Other | -14% | -100,000 | 616,250 | 18 Aug 2025 | By LLC | ||
| Michael G. Huebert | CNM | Class A Common Stock | Tax liability | -7.88% | -1,337 | 15,634 | 22 Jul 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.