Atkore Inc. (ATKR) Ownership
ATKR ownership summary
as of October 17, 2026- Institutions
- 98.5% of shares outstanding
- Insiders
- 0.97% of shares outstanding
- Shares outstanding
- 33.8M
- Float
- 31.8M shares available to trade
- Short interest
- 4.89% 1.6M shares short
- Days to cover
- 2.03 short interest up 44.5% vs prior month
- Institutions 98.51%
- Insiders 0.97%
- Other investors 0.51%
ATKR top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 9.23% | 3.1M | $295.9M | +489,431 (+18.6%) | June 30, 2026 |
| 2 | Vanguard Portfolio Management, LLC | 6.28% | 2.1M | $201.5M | +31,911 (+1.5%) | June 30, 2026 |
| 3 | American Century Companies Inc | 5.26% | 1.8M | $168.6M | +336,042 (+23.4%) | June 30, 2026 |
| 4 | Gates Capital Management Inc | 5.06% | 1.7M | $162.4M | −975,526 (−36.3%) | June 30, 2026 |
| 5 | Vanguard Capital Management, LLC | 4.51% | 1.5M | $144.7M | +9,142 (+0.6%) | June 30, 2026 |
| 6 | Dimensional Fund Advisors, Inc. | 3.85% | 1.3M | $123.4M | +71,795 (+5.8%) | June 30, 2026 |
| 7 | LSV Asset Management | 3.24% | 1.1M | $103.8M | +41,729 (+4.0%) | June 30, 2026 |
| 8 | State Street Corp | 2.68% | 906K | $86.1M | +71,265 (+8.5%) | June 30, 2026 |
| 9 | Geode Capital Management, LLC | 2.67% | 902K | $85.7M | +47,755 (+5.6%) | June 30, 2026 |
| 10 | Earnest Partners LLC | 2.29% | 772K | $73.3M | −5,611 (−0.7%) | June 30, 2026 |
| 11 | Hill City Capital, LP | 2.14% | 724K | $68.8M | −4,100 (−0.6%) | June 30, 2026 |
| 12 | T. Rowe Price Investment Management,Inc. | 1.92% | 648K | $61.5M | +647,881 (0.0%) | June 30, 2026 |
| 13 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 1.70% | 576K | $54.7M | +42,615 (+8.0%) | June 30, 2026 |
| 14 | Harding Loevner L.P. | 1.68% | 567K | $53.9M | −137,670 (−19.5%) | June 30, 2026 |
| 15 | First Trust Advisors L.P. | 1.58% | 533K | $50.6M | −693,777 (−56.5%) | June 30, 2026 |
| 16 | JPMorgan Chase & Co | 1.54% | 521K | $49.5M | +270,556 (+108.1%) | June 30, 2026 |
| 17 | Jacobs Levy Equity Management, Inc. | 1.54% | 519K | $49.3M | +175,986 (+51.3%) | June 30, 2026 |
| 18 | Irenic Capital Management LP | 1.50% | 508K | $48.2M | +493,636 (+3,531.8%) | June 30, 2026 |
| 19 | Arrowstreet Capital Limited Partnership | 1.43% | 482K | $45.8M | −215,895 (−30.9%) | June 30, 2026 |
| 20 | Charles Schwab Investment Management Inc | 1.34% | 454K | $43.1M | +36,320 (+8.7%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 14 holders added 2.8M shares and 6 cut 2.0M.
ATKR top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Avantis US Small Cap Value ETF | 5.56% | 1.9M | $178.5M | +4,728 (+0.3%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 3.19% | 1.1M | $102.4M | −1,800 (−0.2%) | August 31, 2026 |
| 3 | iShares Russell 2000 ETF | 2.63% | 887K | $84.2M | −10,240 (−1.1%) | September 30, 2026 |
| 4 | Vanguard Small Cap Index | 2.30% | 776K | $73.7M | +270 (+0.0%) | August 31, 2026 |
| 5 | Global X US Infrastructure Dev ETF | 1.78% | 602K | $57.1M | +4,320 (+0.7%) | September 30, 2026 |
| 6 | Vanguard MStar Small Cap Value Index | 1.46% | 493K | $46.9M | +406 (+0.1%) | August 31, 2026 |
| 7 | Fidelity Small Cap Index | 1.11% | 375K | $35.6M | +2,924 (+0.8%) | July 31, 2026 |
| 8 | iShares Russell 2000 Value ETF | 0.95% | 322K | $30.6M | +488 (+0.2%) | September 30, 2026 |
| 9 | Vanguard Strategic Equity Inv | 0.91% | 306K | $29.1M | — | June 30, 2026 |
| 10 | DFA US Small Cap Value I | 0.76% | 255K | $24.3M | — | August 31, 2026 |
| 11 | Vanguard Russell 2000 ETF | 0.58% | 197K | $18.7M | +4,599 (+2.4%) | August 31, 2026 |
| 12 | Schwab US Small-Cap ETF™ | 0.53% | 178K | $16.9M | +117 (+0.1%) | September 30, 2026 |
| 13 | Fidelity Extended Market Index | 0.50% | 168K | $16.0M | −3,119 (−1.8%) | August 31, 2026 |
| 14 | BlackRock Event Driven Equity Instl | 0.48% | 163K | $15.5M | +163,243 (0.0%) | August 31, 2026 |
| 15 | Dimensional US Small Cap Value ETF | 0.47% | 157K | $14.9M | — | September 24, 2026 |
| 16 | BlackRock Global Equity Mkt Netrl Instl | 0.45% | 152K | $14.4M | −6,370 (−4.0%) | July 31, 2026 |
| 17 | DFA US Small Cap I | 0.44% | 150K | $14.3M | — | August 31, 2026 |
| 18 | Arbitrage R | 0.42% | 140K | $13.3M | +140,189 (0.0%) | August 31, 2026 |
| 19 | Vanguard High Dividend Yield ETF | 0.40% | 135K | $12.8M | +623 (+0.5%) | August 31, 2026 |
| 20 | AB Merger Arbitrage S1 USD | 0.35% | 117K | $11.1M | +116,882 (0.0%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ATKR insider transactions
latest 4| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-02-17 | Mark F Lamps | Sell | $65.78 | 1,000 | $65,780 |
| 2025-11-17 | Mark F Lamps | Sell | $64.75 | 1,000 | $64,750 |
| 2025-08-15 | Mark F Lamps | Sell | $59.37 | 1,000 | $59,370 |
| 2025-05-09 | Mark F Lamps | Sell | $69.16 | 1,000 | $69,160 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
ATKR shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ATKR
Institutional investors own 98.5% of Atkore's shares and insiders 0.97%. The largest holder is BlackRock Inc with 9.23% of the shares (3.1M), as of June 30, 2026. Among the top 20 institutions, 14 added shares and 6 reduced their stake in the latest filings. Short interest is 4.89% of the float, or 2.03 days of average trading volume. The share count fell 45.7% since 2014.
Related: ATKR analyst forecast, ATKR key metrics, ATKR dividend history. See the ATKR stock overview for the latest quote and news.
ATKR ownership FAQ
Who owns the most Atkore stock?
The largest shareholders of Atkore are BlackRock Inc (9.23%), Vanguard Portfolio Management, LLC (6.28%), American Century Companies Inc (5.26%), Gates Capital Management Inc (5.06%), Vanguard Capital Management, LLC (4.51%).
What percentage of Atkore is owned by institutions?
Institutions hold 98.5% of Atkore's shares outstanding; insiders hold 0.97%.
Which funds own Atkore?
The largest fund holders of Atkore are Avantis US Small Cap Value ETF (5.56%), Vanguard MStar Total Stk Mkt Idx Invest (3.19%), iShares Russell 2000 ETF (2.63%), Vanguard Small Cap Index (2.30%), Global X US Infrastructure Dev ETF (1.78%).
What is Atkore's short interest?
1.6M shares of Atkore were sold short, 4.89% of the float; at the average daily volume it would take 2.03 days to cover.
Are insiders buying or selling Atkore?
Of the latest 4 reported insider transactions in Atkore (since May 9, 2025), 0 were purchases and 4 were sales.
How many shares of Atkore are outstanding?
Atkore has 33.8M shares outstanding, of which 31.8M are in the public float.