Core & Main Inc
Ownership
Ownership Structure
Who owns Core & Main Inc (CNM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.7% of the shares are freely tradable; institutional investors hold 112.3%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 9.95 | 18,357,688 | -4.4 | 06/30/2026 |
| Capital World Investors | 6.22 | 11,473,053 | -0.8 | 06/30/2026 |
| FMR Inc | 4.86 | 8,959,133 | +65.8 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.62 | 8,517,598 | +0.6 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 4.47 | 8,251,721 | +5.5 | 06/30/2026 |
| First Trust Advisors L.P. | 3.39 | 6,248,855 | +1.9 | 06/30/2026 |
| Morgan Stanley - Brokerage Accounts | 3.27 | 6,040,241 | +11.1 | 06/30/2026 |
| State Street Corp | 3.20 | 5,908,053 | +2.2 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.62 | 6,667,875 | +0.0 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.25 | 5,988,216 | +0.0 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Witkowski Mark R | Chief Executive Officer | 31,523 | 1,396,469 $ | Oct 16, 2026 | direct |
| Huebert Michael G. | President | 24,036 | 1,064,795 $ | Jul 22, 2026 | direct |
| Harper Carla D | Senior VP, Human Resources | 13,064 | 578,735 $ | Aug 4, 2026 | direct |
| Hope James D | Director | 11,805 | 522,961 $ | Jul 6, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 16, 2026 | Witkowski Mark R | Chief Executive Officer | Other | 19,596 | 0.00 | – |
| Aug 4, 2026 | Harper Carla D | Senior VP, Human Resources | Other | 242 | 46.32 | 11,209 |
| Jul 22, 2026 | Huebert Michael G. | President | Other | 1,301 | 43.75 | 56,919 |
| Jul 6, 2026 | Hope James D | Director | Buy | 2,067 | 46.01 | 95,111 |
| Apr 17, 2026 | Robyn L Bradbury | CFO | Sell | 5,000 | 52.54 | 262,700 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: October 30, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.