Comparable stake leader
Gates Capital Management, 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
Gates Capital Management, Inc.
Comparable rows
50/50
Latest evidence
29 May 2026
- Public ticker
- ATKR on NYSE
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Gates Capital Management, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Gates Capital Management, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
29 May 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
Gates Capital Management,...
Disclosed value leader
Gates Capital Management,...
Comparable rows
50/50
Latest evidence
29 May 2026
13D/G
13F
3/4/5
Lead comparable stake: 7.8%
13D/G row: Gates Capital Management, Inc.
Showing 1-8 of 50 holder rows.
Quick read
Gates Capital Management, Inc. leads the comparable SEC ownership view at 7.8%.
50 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 Gates Capital Management, Inc.'s linked filing trail.
Comparable ownership
Top 5
Gates Capital Management, Inc.
7.8%
BlackRock, Inc.
7.3%
VANGUARD PORTFOLIO MANAGEMENT LLC
6.3%
VANGUARD CAPITAL MANAGEMENT LLC
5.2%
FIRST TRUST PORTFOLIOS LP
3.9%
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 |
|---|---|---|---|---|---|
| Gates Capital Management, Inc. |
13D/G
13F
Gates Capital Management, L.P. · Company
|
7.8%
|
$197,035,329
2,628,189 shares
|
-$47,746,294 | 30 Jun 2025 |
| BlackRock, Inc. |
13F
13D/G
Company
|
7.3%
from 13D/G
|
$154,744,274
2,626,791 shares
|
— | 31 Mar 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
13F
Vanguard Portfolio Management · Company
|
6.3%
|
$124,742,384
2,117,497 shares
|
$0 | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5.2%
|
$104,470,171
1,773,377 shares
|
$0 | 31 Mar 2026 |
| FIRST TRUST PORTFOLIOS LP |
13D/G
First Trust Portfolios L.P.
|
3.9%
|
$81,974,453
1,306,574 shares
|
-$26,000,209 | 30 Sep 2025 |
| William E. Waltz Jr. |
3/4/5
President and CEO, Director
|
0.47%
|
$9,440,169
160,247 shares
|
— | 29 May 2026 |
| John W. Pregenzer |
3/4/5
COO & President, Electrical
|
0.18%
|
$3,612,896
61,329 shares
|
— | 29 May 2026 |
| Mark F. Lamps |
3/4/5
Pres. Safety & Infrastructure
|
0.11%
|
$2,126,800
36,103 shares
|
-$189,900 | 29 May 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: -$638,930.
Buys
$0
Insiders: 0
Sells
$638,930
Insiders: 3
Net
-$638,930
Shares: -9,098
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 9,098
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 6,098 | $0 | $449,030 | -$449,030 |
| 3-6 | 0 | 1,000 | $0 | $65,780 | -$65,780 |
| 6-9 | 0 | 1,000 | $0 | $64,750 | -$64,750 |
| 9-12 | 0 | 1,000 | $0 | $59,370 | -$59,370 |
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 E. Waltz Jr.
Net 12M change
-$638,930
Latest report
29 May 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| William E. Waltz Jr. | President and CEO, Director | $9,440,169 | Median | 29 May 2026 | ||
| John W. Pregenzer | COO & President, Electrical | $3,612,896 | Median | 29 May 2026 | ||
| William VanArsdale | Director | $3,518,701 | Mixed | 27 Jan 2022 | ||
| David Paul Johnson | Vice President and CFO | $3,056,088 | Mixed | 15 Mar 2024 | ||
| Mark F. Lamps | Pres. Safety & Infrastructure | $2,126,800 | -$189,900 | -8.2% | Median | 29 May 2026 |
| LeAngela W. Lowe | VP, Chief HR Officer | $2,122,332 | Median | 29 May 2026 | ||
| Daniel S. Kelly | VP, General Counsel and Sec. | $1,922,238 | Median | 29 May 2026 | ||
| Scott H. Muse | Director | $1,922,181 | Median | 29 May 2026 | ||
| Jeri L. Isbell | Director | $1,800,176 | Median | 29 May 2026 | ||
| A. Mark Zeffiro | Director | $1,410,626 | Median | 29 May 2026 | ||
| Michael V Schrock | Director | $1,306,578 | Median | 29 May 2026 | ||
| Betty R. Wynn | Director | $1,212,836 | Median | 29 May 2026 | ||
| John M. Deitzer | Vp, Cfo | $1,112,264 | Median | 29 May 2026 | ||
| Justin A. Kershaw | Director | $1,100,667 | -$206,206 | -16% | Median | 29 May 2026 |
| Wilbert W. James Jr. | Director | $1,009,160 | -$242,824 | -19% | Median | 29 May 2026 |
| Barbara Joanne Edwards | Director | $358,253 | Median | 29 May 2026 | ||
| James W. Alvey | Chief Accounting Officer | $320,475 | Median | 29 May 2026 | ||
| Franklin S. Edmonds Jr. | Director | $166,925 | Median | 29 May 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | ||
| Mark F. Lamps | ATKR | Common Stock | Award | 0.15% | 53.22 | 36,103 | 29 May 2026 | Direct | ||
| Wilbert W. James Jr. | ATKR | Common Stock | Award | 0.4% | 67.99 | 17,131 | 29 May 2026 | Direct | ||
| B. Joanne Edwards | ATKR | Common Stock | Award | 0.34% | 20.41 | 6,081 | 29 May 2026 | Direct | ||
| William E. Waltz Jr. | ATKR | Common Stock | Award | 0.22% | 272 | 123,411 | 29 May 2026 | Direct | ||
| Jeri L. Isbell | ATKR | Common Stock | Award | 0.36% | 110 | 30,558 | 29 May 2026 | Direct | ||
| John M. Deitzer | ATKR | Common Stock | Award | 0.28% | 53.26 | 18,881 | 29 May 2026 | Direct | ||
| Justin A. Kershaw | ATKR | Common Stock | Award | 0.4% | 74.16 | 18,684 | 29 May 2026 | Direct | ||
| LeAngela W. Lowe | ATKR | Common Stock | Award | 0.11% | 40.53 | 36,027 | 29 May 2026 | Direct | ||
| John W. Pregenzer | ATKR | Common Stock | Award | 0.15% | 92.41 | 61,329 | 29 May 2026 | Direct | ||
| James W. Alvey | ATKR | Common Stock | Award | 0.19% | 10.52 | 5,440 | 29 May 2026 | Direct | ||
| Michael V Schrock | ATKR | Common Stock | Award | 0.04% | 9.11 | 22,179 | 29 May 2026 | Direct | ||
| Scott H. Muse | ATKR | Common Stock | Award | 0.33% | 107 | 32,629 | 29 May 2026 | Direct | ||
| William E. Waltz Jr. | ATKR | Common Stock | Gift | 54.5% | 13,000 | 36,836 | 08 May 2026 | By Trust | ||
| William E. Waltz Jr. | ATKR | Common Stock | Gift | -9.55% | -13,000 | 123,139 | 08 May 2026 | Direct | ||
| Wilbert W. James Jr. | ATKR | Common Stock | Sale | -16.2% | $242,824 | $73.61 | -3,299 | 17,063 | 08 May 2026 | Direct |
| Justin A. Kershaw | ATKR | Common Stock | Sale | -13.1% | $206,206 | $73.67 | -2,799 | 18,610 | 08 May 2026 | Direct |
| Mark F. Lamps | ATKR | Common Stock | Award | 0.19% | 67.75 | 36,049 | 27 Feb 2026 | Direct | ||
| Jeri L. Isbell | ATKR | Common Stock | Award | 0.46% | 140 | 30,448 | 27 Feb 2026 | Direct | ||
| Betty R. Wynn | ATKR | Common Stock | Award | 0.19% | 39.35 | 20,557 | 27 Feb 2026 | Direct | ||
| Justin A. Kershaw | ATKR | Common Stock | Award | 0.44% | 94.42 | 21,409 | 27 Feb 2026 | Direct | ||
| John W. Pregenzer | ATKR | Common Stock | Award | 0.19% | 118 | 61,237 | 27 Feb 2026 | Direct | ||
| LeAngela W. Lowe | ATKR | Common Stock | Award | 0.14% | 51.6 | 35,986 | 27 Feb 2026 | Direct | ||
| A. Mark Zeffiro | ATKR | Common Stock | Award | 0.29% | 69.31 | 23,891 | 27 Feb 2026 | Direct | ||
| William E. Waltz Jr. | ATKR | Common Stock | Award | 0.25% | 346 | 136,139 | 27 Feb 2026 | Direct | ||
| Scott H. Muse | ATKR | Common Stock | Award | 0.42% | 136 | 32,522 | 27 Feb 2026 | Direct | ||
| John M. Deitzer | ATKR | Common Stock | Award | 0.36% | 67.81 | 18,827 | 27 Feb 2026 | Direct | ||
| Wilbert W. James Jr. | ATKR | Common Stock | Award | 0.43% | 86.57 | 20,362 | 27 Feb 2026 | Direct | ||
| B. Joanne Edwards | ATKR | Common Stock | Award | 0.43% | 25.98 | 6,061 | 27 Feb 2026 | Direct | ||
| James W. Alvey | ATKR | Common Stock | Award | 0.25% | 13.4 | 5,430 | 27 Feb 2026 | Direct | ||
| Michael V Schrock | ATKR | Common Stock | Award | 0.05% | 11.6 | 22,170 | 27 Feb 2026 | Direct | ||
| Daniel S. Kelly | ATKR | Common Stock | Award | 0.16% | 52.14 | 32,589 | 27 Feb 2026 | Direct | ||
| Franklin S. Edmonds Jr. | ATKR | Common Stock | Award | 0.51% | 14.32 | 2,822 | 27 Feb 2026 | Direct | ||
| Mark F. Lamps | ATKR | Common Stock | Sale | -2.7% | $65,780 | $65.78 | -1,000 | 35,982 | 17 Feb 2026 | Direct |
| John W. Pregenzer | ATKR | Common Stock | Tax liability | -1.87% | -1,164 | 61,119 | 02 Feb 2026 | Direct | ||
| Franklin S. Edmonds Jr. | ATKR | Common Stock | Award | 2,808 | 2,808 | 29 Jan 2026 | Direct | |||
| B. Joanne Edwards | ATKR | Common Stock | Award | 60.5% | 2,275 | 6,035 | 29 Jan 2026 | Direct | ||
| Justin A. Kershaw | ATKR | Common Stock | Award | 12% | 2,275 | 21,314 | 29 Jan 2026 | Direct | ||
| Wilbert W. James Jr. | ATKR | Common Stock | Award | 12.6% | 2,275 | 20,275 | 29 Jan 2026 | Direct | ||
| A. Mark Zeffiro | ATKR | Common Stock | Award | 10.6% | 2,275 | 23,822 | 29 Jan 2026 | Direct | ||
| Betty R. Wynn | ATKR | Common Stock | Award | 12.5% | 2,275 | 20,517 | 29 Jan 2026 | Direct | ||
| Scott H. Muse | ATKR | Common Stock | Award | 7.56% | 2,275 | 32,386 | 29 Jan 2026 | Direct | ||
| Jeri L. Isbell | ATKR | Common Stock | Award | 8.12% | 2,275 | 30,308 | 29 Jan 2026 | Direct | ||
| Michael V Schrock | ATKR | Common Stock | Award | 11.4% | 2,275 | 22,159 | 29 Jan 2026 | Direct | ||
| Betty R. Wynn | ATKR | Common Stock | Award | 0.28% | 51.29 | 18,242 | 17 Dec 2025 | Direct | ||
| Justin A. Kershaw | ATKR | Common Stock | Award | 0.49% | 93.1 | 19,039 | 17 Dec 2025 | Direct | ||
| Wilbert W. James Jr. | ATKR | Common Stock | Award | 0.48% | 85.17 | 18,000 | 17 Dec 2025 | Direct |
* marks a reported price that did not pass the local price check.