Atkore International Group Inc
Ownership
Ownership Structure
Who owns Atkore International Group Inc (ATKR)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 93.8% of the shares are freely tradable; institutional investors hold 98.4%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 7.78 | 2,626,791 | +2.8 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 6.19 | 2,090,469 | +0.0 | 03/31/2026 |
| American Century Companies Inc | 5.26 | 1,775,158 | +23.4 | 06/30/2026 |
| Gates Capital Management Inc | 5.06 | 1,710,192 | -36.3 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.49 | 1,515,110 | +0.0 | 03/31/2026 |
| Dimensional Fund Advisors, Inc. | 3.85 | 1,299,786 | +5.8 | 06/30/2026 |
| LSV Asset Management | 3.24 | 1,093,590 | +4.0 | 06/30/2026 |
| Coliseum Capital Management LLC | 2.80 | 947,070 | +17.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Avantis US Small Cap Value ETF | 5.12 | 1,729,545 | +0.1 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.20 | 1,080,205 | +0.5 | 07/31/2026 |
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 |
|---|---|---|---|---|---|
| Waltz William E Jr. | President and CEO | 123,653 | 11,685,195 $ | Aug 28, 2026 | direct |
| Pregenzer John W | COO & President, Electrical | 61,411 | 5,803,355 $ | Aug 28, 2026 | direct |
| Lowe LeAngela W. | VP, Chief HR Officer | 36,063 | 3,407,924 $ | Aug 28, 2026 | direct |
| Lamps Mark F. | Pres. Safety & Infrastructure | 35,850 | 3,387,807 $ | Aug 28, 2026 | direct |
| Muse Scott H | Director | 32,724 | 3,092,425 $ | Aug 28, 2026 | direct |
| Kelly Daniel S | VP, General Counsel and Sec. | 32,666 | 3,086,981 $ | Aug 28, 2026 | direct |
| Isbell Jeri L | Director | 30,656 | 2,896,987 $ | Aug 28, 2026 | direct |
| Zeffiro A Mark | Director | 23,994 | 2,267,415 $ | Aug 28, 2026 | direct |
| Schrock Michael V | Director | 22,187 | 2,096,703 $ | Aug 28, 2026 | direct |
| Wynn Betty R. | Director | 20,616 | 1,948,196 $ | Aug 28, 2026 | direct |
| Deitzer John Michael | VP, CFO | 18,928 | 1,788,701 $ | Aug 28, 2026 | direct |
| Kershaw Justin A | Director | 18,750 | 1,771,852 $ | Aug 28, 2026 | direct |
| James Wilbert W Jr | Director | 17,191 | 1,624,544 $ | Aug 28, 2026 | direct |
| Edwards Barbara Joanne | Director | 6,099 | 576,403 $ | Aug 28, 2026 | direct |
| Alvey James William | Chief Accounting Officer | 5,449 | 514,972 $ | Aug 28, 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 |
|---|---|---|---|---|---|---|
| Aug 28, 2026 | Deitzer John Michael | VP, CFO | Other | 47 | 0.00 | – |
| Aug 28, 2026 | Alvey James William | Chief Accounting Officer | Other | 9 | 0.00 | – |
| Aug 28, 2026 | Edmonds Franklin S. Jr. | Director | Other | 10 | 0.00 | – |
| Aug 28, 2026 | Pregenzer John W | COO & President, Electrical | Other | 82 | 0.00 | – |
| Aug 28, 2026 | Lowe LeAngela W. | VP, Chief HR Officer | Other | 36 | 0.00 | – |
| Aug 28, 2026 | Lamps Mark F. | Pres. Safety & Infrastructure | Other | 47 | 0.00 | – |
| Aug 28, 2026 | Edwards Barbara Joanne | Director | Other | 18 | 0.00 | – |
| Aug 28, 2026 | Kershaw Justin A | Director | Other | 66 | 0.00 | – |
| Aug 28, 2026 | James Wilbert W Jr | Director | Other | 60 | 0.00 | – |
| Aug 28, 2026 | Waltz William E Jr. | President and CEO | Other | 242 | 0.00 | – |
| Aug 28, 2026 | Kelly Daniel S | VP, General Counsel and Sec. | Other | 36 | 0.00 | – |
| Aug 28, 2026 | Zeffiro A Mark | Director | Other | 48 | 0.00 | – |
| Aug 28, 2026 | Wynn Betty R. | Director | Other | 28 | 0.00 | – |
| Aug 28, 2026 | Muse Scott H | Director | Other | 95 | 0.00 | – |
| Aug 28, 2026 | Isbell Jeri L | Director | Other | 98 | 0.00 | – |
| Aug 28, 2026 | Schrock Michael V | Director | Other | 8 | 0.00 | – |
| Aug 10, 2026 | Lamps Mark F. | Pres. Safety & Infrastructure | Sell | 300 | 93.75 | 28,125 |
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: September 17, 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.