Atkore Inc. (ATKR) — Institutional Holders, Q2 2026

327 institutional investment managers reported a ATKR position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $2.5B. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.

← ATKR stock profile

ATKR in Q2 2026: what funds did

Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.

New positions

Added to

119

Trimmed

Sold out

Biggest buyers

T. Rowe Price Investment ManagementNew · +647,881 sh+$49.3M
Irenic Capital ManagementAdded · +493,636 sh+$37.5M
BlackRockAdded · +489,431 sh+$37.2M
Boston PartnersNew · +367,806 sh+$28.0M
AMERICAN CENTURY COMPANIESAdded · +336,042 sh+$25.6M

Biggest sellers

Gates Capital ManagementTrimmed · -975,526 sh-$74.2M
Coliseum Capital ManagementSold out · -947,070 sh-$72.0M
FIRST ADVISORSTrimmed · -693,777 sh-$52.8M
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPTrimmed · -215,895 sh-$16.4M
CANYON CAPITAL ADVISORSTrimmed · -165,300 sh-$12.6M

ATKR 13F holders ranked 1–100 of 327

Institutional investors reporting a position in Atkore Inc. on SEC Form 13F-HR for Q2 2026, ranked by reported value.
#	Institution	Shares	Value	% of portfolio	QoQShares vs Q1 2026
1	BlackRock#1 · 3,116,222 sh	3,116,222	$237.0M	<0.01%	+18.6%
2	VANGUARD PORTFOLIO MANAGEMENT#2 · 2,122,380 sh	2,122,380	$161.4M	<0.01%	+1.5%
3	AMERICAN CENTURY COMPANIES#3 · 1,775,158 sh	1,775,158	$135.0M	0.06%	+23.4%
4	Gates Capital Management#4 · 1,710,192 sh	1,710,192	$130.0M	3.13%	-36.3%
5	VANGUARD CAPITAL MANAGEMENT#5 · 1,524,252 sh	1,524,252	$115.9M	<0.01%	+0.6%
6	DIMENSIONAL FUND ADVISORS#6 · 1,299,786 sh	1,299,786	$98.8M	0.02%	+5.8%
7	LSV ASSET MANAGEMENT#7 · 1,093,590 sh	1,093,590	$83.2M	0.15%	+4.0%
8	STATE STREET#8 · 906,421 sh	906,421	$68.9M	<0.01%	+8.5%
9	GEODE CAPITAL MANAGEMENT#9 · 902,486 sh	902,486	$68.6M	<0.01%	+5.6%
10	EARNEST PARTNERS#10 · 772,294 sh	772,294	$58.7M	0.21%	-0.7%
11	Hill City Capital#11 · 724,106 sh	724,106	$55.1M	1.41%	-0.6%
12	T. Rowe Price Investment Management#12 · 647,881 sh	647,881	$49.3M	0.03%	New
13	MIRAE ASSET GLOBAL ETFS Ltd.#13 · 575,607 sh	575,607	$43.8M	0.05%	+8.0%
14	HARDING LOEVNER#14 · 567,192 sh	567,192	$43.1M	0.41%	-19.5%
15	FIRST ADVISORS#15 · 533,063 sh	533,063	$40.5M	0.02%	-56.5%
16	JACOBS LEVY EQUITY MANAGEMENT#16 · 519,275 sh	519,275	$39.5M	0.14%	+51.3%
17	JPMORGAN CHASE#17 · 520,864 sh	520,864	$39.2M	<0.01%	+108.1%
18	Irenic Capital Management#18 · 507,613 sh	507,613	$38.6M	1.85%	+3531.8%
19	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP#19 · 482,239 sh	482,239	$36.7M	0.02%	-30.9%
20	CHARLES SCHWAB INVESTMENT MANAGEMENT#20 · 453,964 sh	453,964	$34.5M	<0.01%	+8.7%
21	BANK OF AMERICA#21 · 438,802 sh	438,802	$33.4M	<0.01%	-5.1%
22	TWO SIGMA INVESTMENTS#22 · 402,131 sh	402,131	$30.6M	0.02%	+13.9%
23	GENDELL JEFFREY L#23 · 400,214 sh	400,214	$30.4M	0.27%	0.0%
24	LONDON OF VIRGINIA#24 · 386,827 sh	386,827	$29.4M	0.17%	+2.4%
25	MORGAN STANLEY#25 · 378,566 sh	378,566	$28.8M	<0.01%	+11.9%
26	Oslo Pensjonsforsikring AS#26 · 377,000 sh	377,000	$28.7M	—	0.0%
27	VICTORY CAPITAL MANAGEMENT#27 · 371,385 sh	371,385	$28.2M	0.02%	-2.1%
28	Boston Partners#28 · 367,806 sh	367,806	$27.9M	0.02%	New
29	NEW YORK STATE COMMON RETIREMENT FUND#29 · 341,215 sh	341,215	$25.9M	0.03%	-0.7%
30	NORTHERN#30 · 335,441 sh	335,441	$25.5M	<0.01%	+4.4%
31	Swedbank AB#31 · 296,206 sh	296,206	$22.5M	0.02%	0.0%
32	GOLDMAN SACHS GROUP#32 · 288,586 sh	288,586	$21.9M	<0.01%	+4.5%
33	BRIDGEWAY CAPITAL MANAGEMENT#33 · 252,429 sh	252,429	$19.2M	0.34%	+3.4%
34	Bank of New York Mellon#34 · 247,645 sh	247,645	$18.8M	<0.01%	+5.0%
35	SEI INVESTMENTS#35 · 244,346 sh	244,346	$18.6M	0.02%	+17.2%
36	Nuveen#36 · 238,992 sh	238,992	$18.2M	<0.01%	+23.2%
37	VANGUARD FIDUCIARY#37 · 223,986 sh	223,986	$17.0M	<0.01%	+2.6%
38	Empowered Funds#38 · 204,012 sh	204,012	$15.5M	0.08%	+52.8%
39	BARCLAYS PLC#39 · 197,509 sh	197,509	$15.0M	<0.01%	+24.4%
40	PDT Partners#40 · 191,253 sh	191,253	$14.5M	0.76%	+64.6%
41	FEDERATED HERMES#41 · 184,141 sh	184,141	$14.0M	0.02%	+15.4%
42	Allianz Asset Management GmbH#42 · 181,838 sh	181,838	$13.8M	0.01%	+49.1%
43	Qube Research & Technologies Ltd#43 · 178,249 sh	178,249	$13.6M	0.01%	+21.2%
44	WELLS FARGO & COMPANY#44 · 155,867 sh	155,867	$11.9M	<0.01%	-12.5%
45	HEALTHCARE OF ONTARIO PENSION PLAN FUND#45 · 150,669 sh	150,669	$11.5M	0.02%	+19.8%
46	D. E. Shaw#46 · 145,448 sh	145,448	$11.1M	<0.01%	+137.4%
47	CANYON CAPITAL ADVISORS#47 · 139,700 sh	139,700	$10.6M	1.20%	-54.2%
48	HOTCHKIS & WILEY CAPITAL MANAGEMENT#48 · 139,446 sh	139,446	$10.6M	0.03%	-9.1%
49	DnB Asset Management AS#49 · 130,833 sh	130,833	$9.9M	0.03%	-21.5%
50	Russell Investments Group, Ltd.#50 · 125,124 sh	125,124	$9.5M	<0.01%	+32.7%
51	Trexquant Investment#51 · 113,413 sh	113,413	$8.6M	0.05%	New
52	CANADA PENSION PLAN INVESTMENT BOARD#52 · 102,900 sh	102,900	$7.8M	<0.01%	-58.4%
53	Allspring Global Investments#53 · 106,066 sh	106,066	$7.7M	0.01%	+38.1%
54	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME#54 · 100,279 sh	100,279	$7.6M	<0.01%	-5.6%
55	Man Group plc#55 · 98,582 sh	98,582	$7.5M	0.01%	-34.4%
56	Aventail Capital Group#56 · 94,600 sh	94,600	$7.2M	0.41%	New
57	Woodline Partners#57 · 94,232 sh	94,232	$7.2M	0.02%	-7.7%
58	Invesco Ltd.#58 · 93,910 sh	93,910	$7.1M	<0.01%	-0.5%
59	NORDEA INVESTMENT MANAGEMENT AB#59 · 89,807 sh	89,807	$6.8M	<0.01%	-3.9%
60	TOWLE#60 · 85,793 sh	85,793	$6.5M	2.21%	New
61	BNP PARIBAS FINANCIAL MARKETS#61 · 83,548 sh	83,548	$6.4M	<0.01%	+9.6%
62	Universal- Beteiligungs- und Servicegesellschaft mbH#62 · 74,805 sh	74,805	$5.7M	<0.01%	+1.8%
63	KESTREL INVESTMENT MANAGEMENT#63 · 74,150 sh	74,150	$5.6M	3.07%	0.0%
64	Rock Point Advisors#64 · 71,688 sh	71,688	$5.5M	1.33%	-16.3%
65	AMERIPRISE FINANCIAL#65 · 70,553 sh	70,553	$5.4M	<0.01%	+0.1%
66	MARTINGALE ASSET MANAGEMENT L P#66 · 70,155 sh	70,155	$5.3M	0.13%	+0.6%
67	JANE STREET GROUP#67 · 68,185 sh	68,185	$5.2M	<0.01%	+40.0%
68	Swiss National Bank#68 · 67,700 sh	67,700	$5.1M	<0.01%	+2.0%
69	ENVESTNET ASSET MANAGEMENT#69 · 66,747 sh	66,747	$5.1M	<0.01%	-8.2%
70	PRUDENTIAL FINANCIAL#70 · 65,330 sh	65,330	$5.0M	<0.01%	+1.8%
71	CAISSE DE DEPOT ET PLACEMENT DU QUEBEC#71 · 63,513 sh	63,513	$4.8M	<0.01%	+159.2%
72	RAYMOND JAMES FINANCIAL#72 · 57,742 sh	57,742	$4.4M	<0.01%	-5.1%
73	Engineers Gate Manager#73 · 57,071 sh	57,071	$4.3M	0.06%	+723.5%
74	Edgestream Partners, L.P.#74 · 56,665 sh	56,665	$4.3M	0.13%	New
75	UBS Group AG#75 · 53,561 sh	53,561	$4.1M	<0.01%	-30.6%
76	Toroso Investments#76 · 51,660 sh	51,660	$3.9M	<0.01%	+61.8%
77	XTX Topco Ltd#77 · 50,831 sh	50,831	$3.9M	0.05%	+774.9%
78	AQR CAPITAL MANAGEMENT#78 · 50,520 sh	50,520	$3.8M	<0.01%	-0.8%
79	Point72 Asset Management, L.P.#79 · 49,751 sh	49,751	$3.8M	<0.01%	New
80	Defiance ETFs#80 · 51,660 sh	51,660	$3.7M	0.05%	+129.7%
81	RHUMBLINE ADVISERS#81 · 46,500 sh	46,500	$3.5M	<0.01%	+6.6%
82	PRICE T ROWE ASSOCIATES#82 · 45,457 sh	45,457	$3.5M	<0.01%	+17.7%
83	NOMURA ASSET MANAGEMENT INTERNATIONAL#83 · 44,800 sh	44,800	$3.4M	<0.01%	-39.7%
84	ALGERT GLOBAL#84 · 43,510 sh	43,510	$3.3M	0.04%	New
85	DENALI ADVISORS#85 · 42,900 sh	42,900	$3.3M	0.33%	-22.0%
86	Brevan Howard Capital Management#86 · 42,459 sh	42,459	$3.2M	0.02%	+38.9%
87	O'SHAUGHNESSY ASSET MANAGEMENT#87 · 41,658 sh	41,658	$3.2M	0.01%	-14.3%
88	OPPENHEIMER ASSET MANAGEMENT#88 · 39,010 sh	39,010	$3.0M	0.03%	-0.6%
89	CSM Advisors#89 · 38,880 sh	38,880	$3.0M	0.06%	+7.3%
90	ISTHMUS PARTNERS#90 · 38,120 sh	38,120	$2.9M	—	+3.5%
91	DEUTSCHE BANK AG\#91 · 36,324 sh	36,324	$2.8M	<0.01%	-76.7%
92	DEAN INVESTMENT ASSOCIATES#92 · 34,631 sh	34,631	$2.6M	0.35%	+339.5%
93	Ausbil Investment Management Ltd#93 · 35,147 sh	35,147	$2.5M	—	+219.6%
94	Legal & General Group Plc#94 · 33,144 sh	33,144	$2.5M	<0.01%	+4.0%
95	VANGUARD ASSET MANAGEMENT, Ltd#95 · 30,988 sh	30,988	$2.4M	<0.01%	0.0%
96	HSBC PLC#96 · 29,846 sh	29,846	$2.3M	<0.01%	+60.0%
97	SUSQUEHANNA INTERNATIONAL GROUP, LLP#97 · 28,858 sh	28,858	$2.2M	<0.01%	-28.6%
98	Linden Thomas Advisory Services#98 · 28,856 sh	28,856	$2.2M	—	+12.4%
99	ALLIANCEBERNSTEIN L.P.#99 · 36,560 sh	36,560	$2.2M	<0.01%	+4.3%
100	CenterBook Partners#100 · 28,144 sh	28,144	$2.1M	0.11%	New

Funds that sold out of ATKR in Q2 2026 (40)

Held ATKR at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.

Institutions that held ATKR in Q1 2026 and reported no position in Q2 2026.
Institution	Shares sold	Value in Q1 2026
Coliseum Capital Management947,070 sh	947,070	$55.8M
VOLORIDGE INVESTMENT MANAGEMENT85,587 sh	85,587	$5.0M
CITADEL ADVISORS64,743 sh	64,743	$3.8M
ALLIANZ SE62,273 sh	62,273	$3.7M
OMERS ADMINISTRATION34,951 sh	34,951	$2.1M
Hudson Bay Capital Management34,946 sh	34,946	$2.1M
LAZARD ASSET MANAGEMENT33,496 sh	33,496	$2.0M
Vident Advisory18,584 sh	18,584	$1.1M
Cambridge Investment Research Advisors15,260 sh	15,260	$899.0K
Murchinson Ltd.15,000 sh	15,000	$883.6K
BLUEFIN CAPITAL MANAGEMENT14,702 sh	14,702	$866.1K
Clear Creek Financial Management12,299 sh	12,299	$724.5K
Sankala Group12,191 sh	12,191	$723.8K
Freestone Grove Partners10,911 sh	10,911	$642.8K
Elo Mutual Pension Insurance10,779 sh	10,779	$635.0K
Van Diest Capital6,912 sh	6,912	$407.2K
ROMAN BUTLER FULLERTON6,074 sh	6,074	$400.4K
HRT FINANCIAL5,661 sh	5,661	$333.0K
Tactive Advisors5,333 sh	5,333	$314.2K
Cetera Investment Advisers5,212 sh	5,212	$307.0K
BOOTHBAY FUND MANAGEMENT4,127 sh	4,127	$243.1K
Amundi3,527 sh	3,527	$207.8K
IMC-Chicago3,500 sh	3,500	$206.2K
Cresset Asset Management3,500 sh	3,500	$206.2K
Advisory Services Network1,359 sh	1,359	$80.1K
QUADRANT CAPITAL GROUP564 sh	564	$65.6K
Boreal Capital Management360 sh	360	$21.2K
Caldwell300 sh	300	$17.7K
Rossby Financial, LCC250 sh	250	$15.1K
Signature Equity Partners156 sh	156	$9.2K
Root Financial Partners155 sh	155	$9.1K
WealthCollab54 sh	54	$3.2K
MAI Capital Management48 sh	48	$2.8K
MassMutual Private Wealth & , FSB23 sh	23	$1.4K
Investors Portfolio Services8 sh	8	$597.00
SWAN Capital10 sh	10	$589.00
Western Wealth Management9 sh	9	$550.00
Walsh & Associates5 sh	5	$295.00
Vermillion Wealth Management4 sh	4	$236.00
CURIO WEALTH1 sh	1	$59.00

Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.