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ATKR · Atkore Inc. · Holdings

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$94.15 -0.01 (-0.01%) At close · Sep 11
Market Cap
$3.18B
Shares
33.77M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 329
Total Value: $2,521,663,162
Total Shares: 33,184,890
Showing 1–100 of 336 holdings by value · page 1 of 4

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 329 13F filers · Δ vs Mar 31, 2026
Top Holder
9.4%
Sep 2023 → Jun 2026 · range 8.2% – 11.2%
+1.2 pts
Top 5
30.9%
Sep 2023 → Jun 2026 · range 28.2% – 36.5%
−0.7 pts
Top 10
45.9%
Sep 2023 → Jun 2026 · range 40.1% – 50.3%
−2.0 pts
HHI
304
Sep 2023 → Jun 2026 · range 290 – 392
Broadly held−17

Quarterly Activity

vs Mar 31, 2026
New
65
Increased
120
Decreased
88
Sold Out
43
Unchanged
56
Holder count: +22
Institutional value: +30.8%
Shares held: +1.4%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 336
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1666138 CUSIP 047649108 13F (30d) 103 filings 103 filers Visit website Investor relations