Comparable stake leader
BlackRock, Inc.
SEC ownership of Atkore Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001666138.
Disclosed value leader
BlackRock, Inc.
Comparable rows
6/50
Latest evidence
30 Jun 2026
- Public ticker
- ATKR on NYSE
- Parsed ownership sources
-
13F and 13D/G
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
-
6 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
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001666138
- Issuer location
- Harvey, IL
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 Atkore 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
6/50
Latest evidence
30 Jun 2026
13F
13D/G
Lead comparable stake: 7.3%
44 rows are not safely comparable across share classes.
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 7.3%.
6 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.
7.3%
VANGUARD PORTFOLIO MANAGEMENT LLC
6.3%
AMERICAN CENTURY INVESTMENT MANAG...
5.3%
VANGUARD CAPITAL MANAGEMENT LLC
5.2%
Gates Capital Management, Inc.
5.1%
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
|
7.3%
Reported 13D/G
· 30 Sep 2025
|
$236,957,509
3,116,222 shares
|
— | 30 Jun 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
13D/G
Company · Vanguard Portfolio Management
|
6.3%
Reported 13D/G
· 31 Mar 2026
|
$161,385,775
2,122,380 shares
|
— | 30 Jun 2026 |
| AMERICAN CENTURY INVESTMENT MANAGEMENT INC |
13D/G
|
5.3%
Reported 13D/G
· 30 Jun 2026
|
$134,983,014
1,775,158 shares
|
$0 | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
13D/G
Company · Vanguard Capital Management
|
5.2%
Reported 13D/G
· 31 Mar 2026
|
$115,904,122
1,524,252 shares
|
— | 30 Jun 2026 |
| Gates Capital Management, Inc. |
13F
13D/G
Company · Gates Capital Management, L.P.
|
5.1%
Reported 13D/G
· 30 Jun 2026
|
$130,043,000
1,710,192 shares
|
— | 30 Jun 2026 |
| FIRST TRUST PORTFOLIOS LP |
13D/G
First Trust Portfolios L.P.
|
3.9%
Reported 13D/G
· 30 Sep 2025
|
$81,974,453
1,306,574 shares
|
-$26,000,209 | 30 Sep 2025 |
| AMERICAN CENTURY COMPANIES INC |
13F
Company
|
—
denominator unverified
|
$134,983,030
1,775,158 shares
|
— | 30 Jun 2026 |
| DIMENSIONAL FUND ADVISORS LP |
13F
Company
|
—
denominator unverified
|
$98,833,585
1,299,786 shares
|
— | 30 Jun 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: -$607,685.
Buys
$0
Insiders: 0
Sells
$607,685
Insiders: 3
Net
-$607,685
Shares: -8,398
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 8,398
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 300 | $0 | $28,125 | -$28,125 |
| 3-6 | 0 | 6,098 | $0 | $449,030 | -$449,030 |
| 6-9 | 0 | 1,000 | $0 | $65,780 | -$65,780 |
| 9-12 | 0 | 1,000 | $0 | $64,750 | -$64,750 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-18 of 18 reporting-owner rows connected to Atkore Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
18
Largest Forms 3/4/5 holder
William VanArsdale
Net 12M change
-$607.69K
Full value: -$607,685 · USD · 12-month changeLatest report
19 Oct 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| William VanArsdale | Director | $3,518,701 | Mixed | 27 Jan 2022 | ||
| David Paul Johnson | Vice President and CFO | $3,056,088 | Mixed | 15 Mar 2024 | ||
| Michael V Schrock | Director | $0 | Mixed | 19 Oct 2026 | ||
| Daniel S. Kelly | VP, General Counsel and Sec. | $0 | Mixed | 19 Oct 2026 | ||
| Justin A. Kershaw | Director | $0 | -$206,206 | -100% | Mixed | 19 Oct 2026 |
| Jeri L. Isbell | Director | $0 | Mixed | 19 Oct 2026 | ||
| John M. Deitzer | Vp, Cfo | $0 | Mixed | 19 Oct 2026 | ||
| William E. Waltz Jr. | President and CEO, Director | $0 | Mixed | 19 Oct 2026 | ||
| James W. Alvey | Chief Accounting Officer | $0 | Mixed | 19 Oct 2026 | ||
| Wilbert W. James Jr. | Director | $0 | -$242,824 | -100% | Mixed | 19 Oct 2026 |
| Betty R. Wynn | Director | $0 | Mixed | 19 Oct 2026 | ||
| Mark F. Lamps | Pres. Safety & Infrastructure | $0 | -$158,655 | -100% | Mixed | 19 Oct 2026 |
| A. Mark Zeffiro | Director | $0 | Mixed | 19 Oct 2026 | ||
| John W. Pregenzer | COO & President, Electrical | $0 | Mixed | 19 Oct 2026 | ||
| Scott H. Muse | Director | $0 | Mixed | 19 Oct 2026 | ||
| B. Joanne Edwards | Director | $0 | Mixed | 19 Oct 2026 | ||
| Franklin S. Edmonds Jr. | Director | $0 | Mixed | 19 Oct 2026 | ||
| LeAngela W. Lowe | VP, Chief HR Officer | $0 | Mixed | 19 Oct 2026 |
Recent insider transactions for Atkore 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| A. Mark Zeffiro | ATKR | Common Stock | Disposed to Issuer | -100% | -23,994 | 0 | 19 Oct 2026 | Direct | ||
| Wilbert W. James Jr. | ATKR | Common Stock | Disposed to Issuer | -100% | -17,191 | 0 | 19 Oct 2026 | Direct | ||
| Daniel S. Kelly | ATKR | Common Stock | Disposed to Issuer | -100% | -42,964 | 0 | 19 Oct 2026 | Direct | ||
| Daniel S. Kelly | ATKR | Common Stock | Award | 31.5% | 10,298 | 42,965 | 19 Oct 2026 | Direct | ||
| Daniel S. Kelly | ATKR | Stock Options (right to buy) | Disposed to Issuer | -100% | -59,010 | 0 | 19 Oct 2026 | Direct | ||
| B. Joanne Edwards | ATKR | Common Stock | Disposed to Issuer | -100% | -6,100 | 0 | 19 Oct 2026 | Direct | ||
| James W. Alvey | ATKR | Common Stock | Disposed to Issuer | -100% | -6,449 | 0 | 19 Oct 2026 | Direct | ||
| James W. Alvey | ATKR | Common Stock | Award | 18.4% | 1,000 | 6,449 | 19 Oct 2026 | Direct | ||
| Michael V Schrock | ATKR | Common Stock | Disposed to Issuer | -100% | -22,187 | 0 | 19 Oct 2026 | Direct | ||
| LeAngela W. Lowe | ATKR | Common Stock | Disposed to Issuer | -100% | -46,361 | 0 | 19 Oct 2026 | Direct | ||
| LeAngela W. Lowe | ATKR | Common Stock | Award | 28.6% | 10,298 | 46,361 | 19 Oct 2026 | Direct | ||
| LeAngela W. Lowe | ATKR | Stock Options (right to buy) | Disposed to Issuer | -100% | -10,521 | 0 | 19 Oct 2026 | Direct | ||
| Mark F. Lamps | ATKR | Common Stock | Disposed to Issuer | -100% | -49,238 | 0 | 19 Oct 2026 | Direct | ||
| Mark F. Lamps | ATKR | Common Stock | Award | 37.3% | 13,388 | 49,238 | 19 Oct 2026 | Direct | ||
| Mark F. Lamps | ATKR | Stock Options (right to buy) | Disposed to Issuer | -100% | -28,637 | 0 | 19 Oct 2026 | Direct | ||
| William E. Waltz Jr. | ATKR | Common Stock | Disposed to Issuer | -100% | -36,836 | 0 | 19 Oct 2026 | By Trust | ||
| William E. Waltz Jr. | ATKR | Common Stock | Disposed to Issuer | -100% | -191,623 | 0 | 19 Oct 2026 | Direct | ||
| William E. Waltz Jr. | ATKR | Common Stock | Award | 55% | 67,970 | 191,623 | 19 Oct 2026 | Direct | ||
| William E. Waltz Jr. | ATKR | Stock Options (right to buy) | Disposed to Issuer | -100% | -261,687 | 0 | 19 Oct 2026 | Direct | ||
| Betty R. Wynn | ATKR | Common Stock | Disposed to Issuer | -100% | -20,616 | 0 | 19 Oct 2026 | Direct | ||
| Franklin S. Edmonds Jr. | ATKR | Common Stock | Disposed to Issuer | -100% | -2,844 | 0 | 19 Oct 2026 | Direct | ||
| John M. Deitzer | ATKR | Common Stock | Disposed to Issuer | -100% | -33,486 | 0 | 19 Oct 2026 | Direct | ||
| John M. Deitzer | ATKR | Common Stock | Award | 76.9% | 14,558 | 33,486 | 19 Oct 2026 | Direct | ||
| Jeri L. Isbell | ATKR | Common Stock | Disposed to Issuer | -100% | -30,656 | 0 | 19 Oct 2026 | Direct | ||
| Scott H. Muse | ATKR | Common Stock | Disposed to Issuer | -100% | -32,724 | 0 | 19 Oct 2026 | Direct | ||
| Justin A. Kershaw | ATKR | Common Stock | Disposed to Issuer | -100% | -18,750 | 0 | 19 Oct 2026 | Direct | ||
| John W. Pregenzer | ATKR | Common Stock | Disposed to Issuer | -100% | -80,228 | 0 | 19 Oct 2026 | Direct | ||
| John W. Pregenzer | ATKR | Common Stock | Award | 30.6% | 18,817 | 80,228 | 19 Oct 2026 | Direct | ||
| John W. Pregenzer | ATKR | Stock Options (right to buy) | Disposed to Issuer | -100% | -24,415 | 0 | 19 Oct 2026 | Direct | ||
| James W. Alvey | ATKR | Common Stock | Award | 0.17% | 9.35 | 5,449 | 28 Aug 2026 | Direct | ||
| William E. Waltz Jr. | ATKR | Common Stock | Award | 0.2% | 242 | 123,653 | 28 Aug 2026 | Direct | ||
| Betty R. Wynn | ATKR | Common Stock | Award | 0.14% | 27.88 | 20,616 | 28 Aug 2026 | Direct | ||
| Wilbert W. James Jr. | ATKR | Common Stock | Award | 0.35% | 60.39 | 17,191 | 28 Aug 2026 | Direct | ||
| Franklin S. Edmonds Jr. | ATKR | Common Stock | Award | 0.35% | 9.99 | 2,844 | 28 Aug 2026 | Direct | ||
| LeAngela W. Lowe | ATKR | Common Stock | Award | 0.1% | 36 | 36,063 | 28 Aug 2026 | Direct | ||
| Justin A. Kershaw | ATKR | Common Stock | Award | 0.35% | 65.87 | 18,750 | 28 Aug 2026 | Direct | ||
| Mark F. Lamps | ATKR | Common Stock | Award | 0.13% | 47.27 | 35,850 | 28 Aug 2026 | Direct | ||
| Jeri L. Isbell | ATKR | Common Stock | Award | 0.32% | 97.87 | 30,656 | 28 Aug 2026 | Direct | ||
| Michael V Schrock | ATKR | Common Stock | Award | 0.04% | 8.09 | 22,187 | 28 Aug 2026 | Direct | ||
| Daniel S. Kelly | ATKR | Common Stock | Award | 0.11% | 36.37 | 32,666 | 28 Aug 2026 | Direct | ||
| A. Mark Zeffiro | ATKR | Common Stock | Award | 0.2% | 48.35 | 23,994 | 28 Aug 2026 | Direct | ||
| Scott H. Muse | ATKR | Common Stock | Award | 0.29% | 94.95 | 32,724 | 28 Aug 2026 | Direct | ||
| John W. Pregenzer | ATKR | Common Stock | Award | 0.13% | 82.08 | 61,411 | 28 Aug 2026 | Direct | ||
| John M. Deitzer | ATKR | Common Stock | Award | 0.25% | 47.31 | 18,928 | 28 Aug 2026 | Direct | ||
| B. Joanne Edwards | ATKR | Common Stock | Award | 0.3% | 18.13 | 6,100 | 28 Aug 2026 | Direct | ||
| Mark F. Lamps | ATKR | Common Stock | Sale | -0.83% | -$28,125 | $93.75 | -300 | 35,803 | 10 Aug 2026 | Direct |
| Franklin S. Edmonds Jr. | ATKR | Common Stock | Award | 0.4% | 11.25 | 2,834 | 29 May 2026 | Direct | ||
| A. Mark Zeffiro | ATKR | Common Stock | Award | 0.23% | 54.43 | 23,945 | 29 May 2026 | Direct | ||
| Betty R. Wynn | ATKR | Common Stock | Award | 0.15% | 31.39 | 20,588 | 29 May 2026 | Direct | ||
| Daniel S. Kelly | ATKR | Common Stock | Award | 0.13% | 40.95 | 32,630 | 29 May 2026 | Direct |
* marks a reported price that did not pass the local price check.