Core & Main CNM Insider Ownership

NYSE CNM

$44.15 +2.08 (+4.94%)

At close: Oct 29, 2026 · 4:00 PM EDT

Insider Holdings by Owner

9.12Mn Shares

Stephen O Leclair3.96Mn43.5%

Laura K Schneider1.10Mn12.1%

John R Schaller869.90K9.5%

Bradford A Cowles823.95K9.0%

Mark R Witkowski647.77K7.1%

Other insiders (15)1.71Mn18.8%

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

3.17%

▲+0.061% pp QoQ

Shares Held by Insiders

6.03Mn

filed for Sep 2026

▲+0.01% QoQ

Shares Outstanding

190.49Mn

190,494,050 shares

Direct Holdings

383.94K

Indirect: 5.65Mn

Net Open-Market Trades

+2.07K

net bought · $95.11K in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Open-Market Insider Trades

Bought Sold

Latest quarter —

Net over range —

Net-buying quarters —

Insider Ownership Summary

Updated Oct 21, 2026

Over the past 12 months, Core & Main insiders bought $195,081 of stock on the open market (4.04K shares) and sold $262,724 (5K shares).

Among CNM's insiders, James D. Hope (Director) was the top open-market buyer in the past 12 months, with $195,081 of stock purchased (4.04K shares) and the latest purchase on July 6, 2026.
Meanwhile, the largest open-market sales of CNM in the past 12 months were by Robyn L. Bradbury (Chief Financial Officer), totaling $262,724 (5K shares), most recently on April 17, 2026.
In transactions other than open-market trades, Core & Main insiders received 54.96K shares in stock awards, acquired 5K shares through option exercises and conversions, gave up 15.19K shares to cover taxes or exercise prices and gave away 19.6K shares as gifts over the past 12 months.
Business Quant data puts insider holdings in CNM at 6.01Mn shares across insiders' latest Form 4 filings, or 3.16% of the 190.49Mn shares outstanding; that total is down 0.32% from 6.03Mn shares at the end of Q2 2026 and up 0.10% from 6.01Mn shares at the end of Q3 2025.
Core & Main insiders hold 364.35K shares directly (6.06% of their total) and 5.65Mn shares (93.94%) indirectly, through entities such as trusts and partnerships.
Business Quant counts 20 insiders with holdings in Core & Main stock, among the officers, directors and 10% owners who have filed a Form 4 in the past two years.
Core & Main's top three insider holders by shares held are Stephen O. Leclair (Executive Chair, 1.84Mn shares), John R. Schaller (Executive Vice President, 870.46K shares) and Bradford A. Cowles (President, 823.95K shares).
Of the shares held by CNM insiders, 30.59% belong to Stephen O. Leclair.
Over the trailing 12 months, 18 insiders reported transactions in CNM stock across 35 Form 4 filings.
This summary of Core & Main insider activity covers Form 4 filings through October 20, 2026.

Form 4 Holdings

Insiders Holding CNM

Insiders 20

Shares held 9.12Mn

Of outstanding 4.79%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Stephen O Leclair	Executive Chair	66,136	3,895,890	3,962,026	43.5%	11 Mar, 2026
2	Laura K Schneider	Chief Human Resources Officer	12,873	1,087,856	1,100,729	12.1%	05 Jun, 2025
3	John R Schaller	Executive Vice President	19,689	850,214	869,903	9.5%	30 May, 2025
4	Bradford A Cowles	President	25,491	798,456	823,947	9.0%	13 Mar, 2026
5	Mark R Witkowski	Chief Executive Officer	31,523	616,250	647,773	7.1%	20 Oct, 2026
6	Jeffrey D Giles	Evp, Corporate Development	9,681	528,115	537,796	5.9%	13 Mar, 2026
7	Dennis G Gipson	Director	16,757	219,601	236,358	2.6%	24 Jun, 2026
8	Mark G Whittenburg	General Counsel And Secretary	8,525	227,312	235,837	2.6%	13 Mar, 2026
9	James G Castellano	Director	7,437	158,946	166,383	1.8%	24 Jun, 2026
10	Robyn L Bradbury	Chief Financial Officer	12,500	152,447	164,947	1.8%	21 Apr, 2026
11	Orvin T Kimbrough	Director	16,757	97,413	114,170	1.3%	24 Jun, 2026
12	John Weldon Stephens	Chief Accounting Officer	17,374	80,000	97,374	1.1%	13 Mar, 2026
13	Margaret Newman	Director	16,757	40,480	57,237	0.6%	24 Jun, 2026
14	Michael G. Huebert	President	24,036	0	24,036	0.3%	23 Jul, 2026
15	Bhavani Amirthalingam	Director	17,955	0	17,955	0.2%	24 Jun, 2026
16	Kathleen M Mazzarella	Director	16,757	0	16,757	0.2%	24 Jun, 2026
17	Robert M Buck	Director	15,849	0	15,849	0.2%	24 Jun, 2026
18	Carla D Harper	Senior Vp, Human Resources	13,064	0	13,064	0.1%	05 Aug, 2026
19	James D Hope	Director	11,805	0	11,805	0.1%	08 Jul, 2026
20	M Susan Hardwick	Director	3,379	0	3,379	0.0%	24 Jun, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

819 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
16 Oct, 2026	Mark R Witkowski	Chief Executive Officer	Disposed G	19,596	$0.00	$0	31,523	Direct
04 Aug, 2026	Carla D Harper	Senior Vp, Human Resources	Disposed F	242	$46.32	$11.21K	13,064	Direct
22 Jul, 2026	Michael G. Huebert	President	Disposed F	1,301	$43.75	$56.92K	24,036	Direct
06 Jul, 2026	James D Hope	Director	Acquired P	2,067	$46.01	$95.11K	11,805	Direct
23 Jun, 2026	Orvin T Kimbrough	Director	Acquired A	2,799	$0.00	$0	16,757	Direct
22 Jun, 2026	Carla D Harper	Senior Vp, Human Resources	Disposed F	568	$47.25	$26.84K	13,306	Direct
23 Jun, 2026	Bhavani Amirthalingam	Director	Acquired A	2,799	$0.00	$0	17,955	Direct
23 Jun, 2026	Margaret Newman	Director	Acquired A	2,799	$0.00	$0	16,757	Direct
23 Jun, 2026	Dennis G Gipson	Director	Acquired A	2,799	$0.00	$0	16,757	Direct
23 Jun, 2026	James G Castellano	Director	Acquired A	2,799	$0.00	$0	7,437	Direct
23 Jun, 2026	Kathleen M Mazzarella	Director	Acquired A	2,799	$0.00	$0	16,757	Direct
23 Jun, 2026	Robert M Buck	Director	Acquired A	2,799	$0.00	$0	15,849	Direct
23 Jun, 2026	M Susan Hardwick	Director	Acquired A	2,799	$0.00	$0	3,379	Direct
23 Jun, 2026	James D Hope	Director	Acquired A	2,799	$0.00	$0	9,738	Direct
17 Apr, 2026	Robyn L Bradbury	Chief Financial Officer	Acquired C	5,000	$0.00	$0	17,500	Direct
17 Apr, 2026	Robyn L Bradbury	Chief Financial Officer	Disposed S	1,647	$51.94	$85.55K	15,853	Direct
17 Apr, 2026	Robyn L Bradbury	Chief Financial Officer	Disposed S	3,353	$52.84	$177.18K	12,500	Direct
17 Apr, 2026	Robyn L Bradbury	Chief Financial Officer	Disposed J	5,000	$0.00	$0	152,447	Indirect
17 Apr, 2026	Robyn L Bradbury	Chief Financial Officer	Acquired J	5,000	$0.00	$0	5,000	Direct
17 Apr, 2026	Robyn L Bradbury	Chief Financial Officer	Disposed C	5,000	$0.00	$0	0	Direct

Showing 1 to 20 of 819 transactions