On this page, we present all of the funds holding ATKR from our database of 13F filers, detailed in the table below. The first column indicates the name of each of the funds holding ATKR, with a link to that fund's top holdings. The next columns indicate the amount of ATKR stock held by each of the funds holding ATKR, followed by the ATKR position size held by the fund, and lastly the date of the quarterly filing period the data represents. In total, we count 412 funds holding ATKR within the last two filing periods in our coverage universe of 13F filers, with the largest position size having been reported by Vanguard Group Inc.. For more details on the positions held by Vanguard Group Inc. (or by any of the other funds holding ATKR), click the fund name in the "Holder" column of the funds-holding-ATKR table below.

Holder	Amount	Position Size ($ in 1000's)	As of
Vanguard Group Inc.	4,408,315	$687,433	06/30/2023
ATKR	4,408,315	$687,433	06/30/2023
BlackRock Inc.	3,833,768	$597,838	06/30/2023
ATKR	3,833,768	$597,838	06/30/2023
FMR LLC	1,643,019	$256,212	06/30/2023
ATKR	1,643,019	$256,212	06/30/2023
Macquarie Group Ltd.	1,156,787	$180,389	06/30/2023
ATKR	1,156,787	$180,389	06/30/2023
River Road Asset Management LLC	1,150,747	$179,447	06/30/2023
ATKR	1,150,747	$179,447	06/30/2023
Fuller & Thaler Asset Management Inc.	1,119,056	$174,506	06/30/2023
ATKR	1,119,056	$174,506	06/30/2023
Dimensional Fund Advisors LP	1,054,359	$164,418	06/30/2023
ATKR	1,054,359	$164,418	06/30/2023
Gates Capital Management Inc.	1,043,519	$162,726	06/30/2023
ATKR	1,043,519	$162,726	06/30/2023
LSV Asset Management	963,668	$150,274	06/30/2023
ATKR	963,668	$150,274	06/30/2023
State Street Corp	874,897	$136,431	06/30/2023
ATKR	874,897	$136,431	06/30/2023
Geode Capital Management LLC	865,041	$135,459	06/30/2023
ATKR	865,041	$135,459	06/30/2023
Allspring Global Investments Holdings LLC	776,134	$121,030	06/30/2023
ATKR	776,134	$121,030	06/30/2023
Invesco Ltd.	718,964	$112,115	06/30/2023
ATKR	718,964	$112,115	06/30/2023
Standard Life Aberdeen plc	655,106	$102,157	06/30/2023
ATKR	655,106	$102,157	06/30/2023
GW&K Investment Management LLC	645,059	$100,591	06/30/2023
ATKR	645,059	$100,591	06/30/2023
Capital Research Global Investors	628,703	$98,040	06/30/2023
ATKR	628,703	$98,040	06/30/2023
Nuveen Asset Management LLC	540,194	$84,238	06/30/2023
ATKR	540,194	$84,238	06/30/2023
Ameriprise Financial Inc.	536,608	$83,677	06/30/2023
ATKR	536,608	$83,677	06/30/2023
Zurcher Kantonalbank Zurich Cantonalbank	519,447	$81,003	06/30/2023
ATKR	519,447	$81,003	06/30/2023
Price T Rowe Associates Inc. MD	506,322	$78,957	06/30/2023
ATKR	506,322	$78,957	06/30/2023
Victory Capital Management Inc.	486,403	$75,850	06/30/2023
ATKR	486,403	$75,850	06/30/2023
Charles Schwab Investment Management Inc.	429,858	$67,032	06/30/2023
ATKR	429,858	$67,032	06/30/2023
Hill City Capital LP	428,759	$66,861	06/30/2023
ATKR	428,759	$66,861	06/30/2023
Goldman Sachs Group Inc.	422,430	$65,874	06/30/2023
ATKR	422,430	$65,874	06/30/2023
American Century Companies Inc.	412,559	$64,334	06/30/2023
ATKR	412,559	$64,334	06/30/2023
Northern Trust Corp	406,233	$63,348	06/30/2023
ATKR	406,233	$63,348	06/30/2023
Federated Hermes Inc.	385,199	$60,068	06/30/2023
ATKR	385,199	$60,068	06/30/2023
ACK Asset Management LLC	360,000	$56,138	06/30/2023
ATKR	360,000	$56,138	06/30/2023
Skandinaviska Enskilda Banken AB publ	340,200	$53,051	06/30/2023
ATKR	340,200	$53,051	06/30/2023
Arrowstreet Capital Limited Partnership	279,630	$43,606	06/30/2023
ATKR	279,630	$43,606	06/30/2023
Morgan Stanley	277,639	$43,295	06/30/2023
ATKR	277,639	$43,295	06/30/2023
Millennium Management LLC	263,680	$41,118	06/30/2023
ATKR	263,680	$41,118	06/30/2023
UBS Group AG		$40,790	06/30/2023
Call	206,500	$32,202	06/30/2023
ATKR	55,074	$8,588	06/30/2023
Schroder Investment Management Group	254,193	$39,639	06/30/2023
ATKR	254,193	$39,639	06/30/2023
JPMorgan Chase & Co.	248,253	$38,713	06/30/2023
ATKR	248,253	$38,713	06/30/2023
William Blair Investment Management LLC	244,797	$38,174	06/30/2023
ATKR	244,797	$38,174	06/30/2023
Boston Partners	241,073	$37,435	06/30/2023
ATKR	241,073	$37,435	06/30/2023
Principal Financial Group Inc.	237,388	$37,018	06/30/2023
ATKR	237,388	$37,018	06/30/2023
Royal Bank of Canada		$35,779	06/30/2023
ATKR	149,445	$23,304	06/30/2023
Call	80,000	$12,475	06/30/2023
Bank of America Corp DE	229,179	$35,738	06/30/2023
ATKR	229,179	$35,738	06/30/2023
Mirae Asset Global Investments Co. Ltd.	213,206	$33,247	06/30/2023
ATKR	213,206	$33,247	06/30/2023
Man Group plc	198,658	$30,979	06/30/2023
ATKR	198,658	$30,979	06/30/2023
Lazard Asset Management LLC	198,662	$30,978	06/30/2023
ATKR	198,662	$30,978	06/30/2023
Citadel Advisors LLC		$30,618	06/30/2023
ATKR	165,243	$25,768	06/30/2023
Call	87,900	$13,707	06/30/2023
Put	56,800	$8,857	06/30/2023
Bank of New York Mellon Corp	194,190	$30,282	06/30/2023
ATKR	194,190	$30,282	06/30/2023
Royce & Associates LP	184,825	$28,822	06/30/2023
ATKR	184,825	$28,822	06/30/2023
Silvercrest Asset Management Group LLC	170,471	$26,583	06/30/2023
ATKR	170,471	$26,583	06/30/2023
Loomis Sayles & Co. L P	163,851	$25,551	06/30/2023
ATKR	163,851	$25,551	06/30/2023
Raymond James & Associates	160,011	$24,952	06/30/2023
ATKR	160,011	$24,952	06/30/2023
Aperture Investors LLC	157,335	$24,535	06/30/2023
ATKR	157,335	$24,535	06/30/2023
Clearbridge Investments LLC	156,175	$24,354	06/30/2023
ATKR	156,175	$24,354	06/30/2023
First Trust Advisors LP	149,424	$23,301	06/30/2023
ATKR	149,424	$23,301	06/30/2023
WS Portfolio Advisory LLC	138,648	$21,621	06/30/2023
ATKR	138,648	$21,621	06/30/2023
Renaissance Technologies LLC	137,100	$21,379	06/30/2023
ATKR	137,100	$21,379	06/30/2023
Nordea Investment Management AB	130,066	$20,307	06/30/2023
ATKR	130,066	$20,307	06/30/2023
Susquehanna International Group LLP		$18,916	06/30/2023
Call	127,800	$19,929	06/30/2023
Put	40,000	$6,238	06/30/2023
ATKR	33,509	$5,225	06/30/2023
Palisade Capital Management LLC NJ	110,452	$17,224	06/30/2023
ATKR	110,452	$17,224	06/30/2023
Voloridge Investment Management LLC	108,615	$16,937	06/30/2023
ATKR	108,615	$16,937	06/30/2023
Capital International Investors	105,245	$16,412	06/30/2023
ATKR	105,245	$16,412	06/30/2023
Tudor Investment Corp Et Al	105,091	$16,388	06/30/2023
ATKR	105,091	$16,388	06/30/2023
Putnam Investments LLC	98,126	$15,302	06/30/2023
ATKR	98,126	$15,302	06/30/2023
Driehaus Capital Management LLC	94,375	$14,717	06/30/2023
ATKR	94,375	$14,717	06/30/2023
Envestnet Asset Management Inc.	94,007	$14,659	06/30/2023
ATKR	94,007	$14,659	06/30/2023
Wedge Capital Management L L P NC	93,994	$14,657	06/30/2023
ATKR	93,994	$14,657	06/30/2023
Prudential Financial Inc.	88,323	$13,773	06/30/2023
ATKR	88,323	$13,773	06/30/2023
Swiss National Bank	86,100	$13,426	06/30/2023
ATKR	86,100	$13,426	06/30/2023
Peregrine Capital Management LLC	80,095	$12,490	06/30/2023
ATKR	80,095	$12,490	06/30/2023
California Public Employees Retirement System	78,952	$12,312	06/30/2023
ATKR	78,952	$12,312	06/30/2023
Arosa Capital Management LP	78,860	$12,297	06/30/2023
ATKR	78,860	$12,297	06/30/2023
Globeflex Capital L P	77,213	$12,041	06/30/2023
ATKR	77,213	$12,041	06/30/2023
Harber Asset Management LLC	75,737	$11,810	06/30/2023
ATKR	75,737	$11,810	06/30/2023
Legal & General Group Plc	74,891	$11,679	06/30/2023
ATKR	74,891	$11,679	06/30/2023
Jane Street Group LLC		$11,660	06/30/2023
Call	54,000	$8,421	06/30/2023
ATKR	22,773	$3,551	06/30/2023
Put	2,000	$312	06/30/2023
Redwood Investments LLC	73,828	$11,513	06/30/2023
ATKR	73,828	$11,513	06/30/2023
Phocas Financial Corp.	72,924	$11,372	06/30/2023
ATKR	72,924	$11,372	06/30/2023
North Point Portfolio Managers Corp OH	72,920	$11,371	06/30/2023
ATKR	72,920	$11,371	06/30/2023
Natixis Advisors L.P.	70,985	$11,070	06/30/2023
ATKR	70,985	$11,070	06/30/2023
Van Den Berg Management I Inc.	69,126	$10,779	06/30/2023
ATKR	69,126	$10,779	06/30/2023
Ziegler Capital Management LLC	68,655	$10,706	06/30/2023
ATKR	68,655	$10,706	06/30/2023
AXA S.A.	67,300	$10,495	06/30/2023
ATKR	67,300	$10,495	06/30/2023
Voya Investment Management LLC	66,759	$10,410	06/30/2023
ATKR	66,759	$10,410	06/30/2023
Seizert Capital Partners LLC	65,611	$10,231	06/30/2023
ATKR	65,611	$10,231	06/30/2023
Great Lakes Advisors LLC	65,404	$10,199	06/30/2023
ATKR	65,404	$10,199	06/30/2023
Cambria Investment Management L.P.	65,260	$10,177	06/30/2023
ATKR	65,260	$10,177	06/30/2023
RE Advisers Corp	64,400	$10,043	06/30/2023
ATKR	64,400	$10,043	06/30/2023
AQR Capital Management LLC	63,988	$9,978	06/30/2023
ATKR	63,988	$9,978	06/30/2023
Balyasny Asset Management LLC	62,164	$9,694	06/30/2023
ATKR	62,164	$9,694	06/30/2023
Bridgewater Associates LP	62,000	$9,668	06/30/2023
ATKR	62,000	$9,668	06/30/2023
Premier Fund Managers Ltd	61,000	$9,484	06/30/2023
ATKR	61,000	$9,484	06/30/2023
Sei Investments Co.	58,448	$9,114	06/30/2023
ATKR	58,448	$9,114	06/30/2023
Jupiter Asset Management Ltd.	58,095	$9,055	06/30/2023
ATKR	58,095	$9,055	06/30/2023
Rhumbline Advisers	56,744	$8,849	06/30/2023
ATKR	56,744	$8,849	06/30/2023
D. E. Shaw & Co. Inc.	56,096	$8,748	06/30/2023
ATKR	56,096	$8,748	06/30/2023
Credit Suisse AG	55,052	$8,585	06/30/2023
ATKR	55,052	$8,585	06/30/2023
First Republic Investment Management Inc.	54,993	$8,576	06/30/2023
ATKR	54,993	$8,576	06/30/2023
New York State Common Retirement Fund	53,425	$8,331	06/30/2023
ATKR	53,425	$8,331	06/30/2023
Russell Investments Group Ltd.	52,470	$8,182	06/30/2023
ATKR	52,470	$8,182	06/30/2023
UBS Asset Management Americas Inc.	57,564	$8,087	06/30/2023
ATKR	57,564	$8,087	06/30/2023
BNP Paribas Arbitrage SA	51,454	$8,024	06/30/2023
ATKR	51,454	$8,024	06/30/2023
Ensign Peak Advisors Inc	50,300	$7,844	06/30/2023
ATKR	50,300	$7,844	06/30/2023
Alliancebernstein L.P.	50,211	$7,830	06/30/2023
ATKR	50,211	$7,830	06/30/2023
Deutsche Bank AG	50,010	$7,799	06/30/2023
ATKR	50,010	$7,799	06/30/2023
State of Wisconsin Investment Board	49,302	$7,688	06/30/2023
ATKR	49,302	$7,688	06/30/2023
Bessemer Group Inc.	49,302	$7,688	06/30/2023
ATKR	49,302	$7,688	06/30/2023
California State Teachers Retirement System	47,944	$7,476	06/30/2023
ATKR	47,944	$7,476	06/30/2023
Commonwealth of Pennsylvania Public School Empls Retrmt SYS	46,760	$7,292	06/30/2023
ATKR	46,760	$7,292	06/30/2023
Livforsakringsbolaget Skandia Omsesidigt	45,300	$7,061	06/30/2023
ATKR	45,300	$7,061	06/30/2023
Manatuck Hill Partners LLC	43,900	$6,846	06/30/2023
ATKR	43,900	$6,846	06/30/2023
HighTower Advisors LLC	39,306	$6,124	06/30/2023
ATKR	39,306	$6,124	06/30/2023
Zacks Investment Management	38,505	$6,004	06/30/2023
ATKR	38,505	$6,004	06/30/2023
Segall Bryant & Hamill LLC	38,301	$5,973	06/30/2023
ATKR	38,301	$5,973	06/30/2023
Winmill & CO. Inc.	38,200	$5,957	06/30/2023
ATKR	38,200	$5,957	06/30/2023
Prudential PLC	37,543	$5,854	06/30/2023
ATKR	37,543	$5,854	06/30/2023
Rockefeller Capital Management L.P.	34,592	$5,394	06/30/2023
ATKR	34,592	$5,394	06/30/2023
Oak Ridge Investments LLC	34,439	$5,370	06/30/2023
ATKR	34,439	$5,370	06/30/2023
Paradiem LLC	33,689	$5,253	06/30/2023
ATKR	33,689	$5,253	06/30/2023
Mutual of America Capital Management LLC	33,666	$5,250	06/30/2023
ATKR	33,666	$5,250	06/30/2023
Clark Capital Management Group Inc.	33,329	$5,197	06/30/2023
ATKR	33,329	$5,197	06/30/2023
Wells Fargo & Company MN	33,076	$5,158	06/30/2023
ATKR	33,076	$5,158	06/30/2023
Truist Financial Corp	32,313	$5,039	06/30/2023
ATKR	32,313	$5,039	06/30/2023
Clark Estates Inc. NY	31,600	$4,928	06/30/2023
ATKR	31,600	$4,928	06/30/2023
Teacher Retirement System of Texas	30,573	$4,768	06/30/2023
ATKR	30,573	$4,768	06/30/2023
Yaupon Capital Management LP	29,071	$4,533	06/30/2023
ATKR	29,071	$4,533	06/30/2023
Yarra Square Partners LP	29,071	$4,533	06/30/2023
ATKR	29,071	$4,533	06/30/2023
Squarepoint Ops LLC	28,041	$4,373	06/30/2023
ATKR	28,041	$4,373	06/30/2023
Janus Henderson Group PLC	27,496	$4,287	06/30/2023
ATKR	27,496	$4,287	06/30/2023
Vontobel Holding Ltd.	27,425	$4,277	06/30/2023
ATKR	27,425	$4,277	06/30/2023
ClariVest Asset Management LLC	27,353	$4,265	06/30/2023
ATKR	27,353	$4,265	06/30/2023
Qube Research & Technologies Ltd	26,729	$4,168	06/30/2023
ATKR	26,729	$4,168	06/30/2023
Centric Wealth Management	27,099	$4,084	06/30/2023
ATKR	27,099	$4,084	06/30/2023
Jetstream Capital LLC	26,000	$4,054	06/30/2023
ATKR	26,000	$4,054	06/30/2023
Citigroup Inc.	25,931	$4,044	06/30/2023
ATKR	25,931	$4,044	06/30/2023
Barclays PLC	25,489	$3,974	06/30/2023
ATKR	25,489	$3,974	06/30/2023
Moody Aldrich Partners LLC	25,079	$3,911	06/30/2023
ATKR	25,079	$3,911	06/30/2023
JB Capital Partners LP	25,000	$3,898	06/30/2023
ATKR	25,000	$3,898	06/30/2023
Foundry Partners LLC	24,856	$3,876	06/30/2023
ATKR	24,856	$3,876	06/30/2023
Grantham Mayo Van Otterloo & Co. LLC	24,561	$3,830	06/30/2023
ATKR	24,561	$3,830	06/30/2023
Franklin Resources Inc.	24,495	$3,820	06/30/2023
ATKR	24,495	$3,820	06/30/2023
Canada Pension Plan Investment Board	24,100	$3,758	06/30/2023
ATKR	24,100	$3,758	06/30/2023
Algert Global LLC	23,866	$3,722	06/30/2023
ATKR	23,866	$3,722	06/30/2023
Castellan Group LLC	23,660	$3,690	06/30/2023
ATKR	23,660	$3,690	06/30/2023
Virginia Retirement Systems ET AL	23,200	$3,618	06/30/2023
ATKR	23,200	$3,618	06/30/2023
State of New Jersey Common Pension Fund D	22,906	$3,572	06/30/2023
ATKR	22,906	$3,572	06/30/2023
Allianz Asset Management GmbH	22,697	$3,539	06/30/2023
ATKR	22,697	$3,539	06/30/2023
Empowered Funds LLC	21,884	$3,413	06/30/2023
ATKR	21,884	$3,413	06/30/2023
EA Series Trust	21,884	$3,413	06/30/2023
ATKR	21,884	$3,413	06/30/2023
Vident Investment Advisory LLC	21,819	$3,402	06/30/2023
ATKR	21,819	$3,402	06/30/2023
Alberta Investment Management Corp	21,200	$3,306	06/30/2023
ATKR	21,200	$3,306	06/30/2023
Hussman Strategic Advisors Inc.	20,900	$3,259	06/30/2023
ATKR	20,900	$3,259	06/30/2023
MetLife Investment Management LLC	20,848	$3,251	06/30/2023
ATKR	20,848	$3,251	06/30/2023
National Asset Management Inc.	20,390	$3,180	06/30/2023
ATKR	20,390	$3,180	06/30/2023
DekaBank Deutsche Girozentrale	20,056	$3,153	06/30/2023
ATKR	20,056	$3,153	06/30/2023
Los Angeles Capital Management & Equity Research Inc.	19,506	$3,042	06/30/2023
ATKR	19,506	$3,042	06/30/2023
Ausbil Investment Management Ltd	19,346	$3,017	06/30/2023
ATKR	19,346	$3,017	06/30/2023
American International Group Inc.	19,074	$2,974	06/30/2023
ATKR	19,074	$2,974	06/30/2023
APG Asset Management N.V.	20,700	$2,959	06/30/2023
ATKR	20,700	$2,959	06/30/2023
Edgestream Partners L.P.	18,789	$2,930	06/30/2023
ATKR	18,789	$2,930	06/30/2023
Knights of Columbus Asset Advisors LLC	18,455	$2,878	06/30/2023
ATKR	18,455	$2,878	06/30/2023
O Shaughnessy Asset Management LLC	18,397	$2,869	06/30/2023
ATKR	18,397	$2,869	06/30/2023
Stratos Wealth Partners LTD.	18,272	$2,849	06/30/2023
ATKR	18,272	$2,849	06/30/2023
Argent Capital Management LLC	17,973	$2,803	06/30/2023
ATKR	17,973	$2,803	06/30/2023
Two Sigma Investments LP	17,300	$2,698	06/30/2023
ATKR	17,300	$2,698	06/30/2023
Euclidean Technologies Management LLC	18,769	$2,637	03/31/2023
ATKR	18,769	$2,637	03/31/2023
J. Goldman & Co LP	16,801	$2,620	06/30/2023
ATKR	16,801	$2,620	06/30/2023
Isthmus Partners LLC	16,337	$2,548	06/30/2023
ATKR	16,337	$2,548	06/30/2023
Hudson Bay Capital Management LP	16,329	$2,546	06/30/2023
ATKR	16,329	$2,546	06/30/2023
Comerica Bank	16,301	$2,542	06/30/2023
ATKR	16,301	$2,542	06/30/2023
The Manufacturers Life Insurance Company	16,078	$2,507	06/30/2023
ATKR	16,078	$2,507	06/30/2023
Candriam Luxembourg S.C.A.	15,727	$2,452	06/30/2023
ATKR	15,727	$2,452	06/30/2023
Orion Portfolio Solutions LLC	15,427	$2,406	06/30/2023
ATKR	15,427	$2,406	06/30/2023
Capital Fund Management S.A.		$2,374	06/30/2023
Call	22,200	$3,462	06/30/2023
Put	17,100	$2,667	06/30/2023
ATKR	10,123	$1,579	06/30/2023
Chartwell Investment Partners LLC	14,617	$2,279	06/30/2023
ATKR	14,617	$2,279	06/30/2023
Dana Investment Advisors Inc.	13,858	$2,161	06/30/2023
ATKR	13,858	$2,161	06/30/2023
Connectus Wealth LLC	13,842	$2,159	06/30/2023
ATKR	13,842	$2,159	06/30/2023
Mercer Global Advisors Inc. ADV	13,597	$2,120	06/30/2023
ATKR	13,597	$2,120	06/30/2023
Riverwater Partners LLC	13,279	$2,071	06/30/2023
ATKR	13,279	$2,071	06/30/2023
Hsbc Holdings PLC	13,179	$2,059	06/30/2023
ATKR	13,179	$2,059	06/30/2023
Sheaff Brock Investment Advisors LLC	12,396	$1,933	06/30/2023
ATKR	12,396	$1,933	06/30/2023
Ergoteles LLC	12,196	$1,902	06/30/2023
ATKR	12,196	$1,902	06/30/2023
HRT Financial LP	12,123	$1,890	06/30/2023
ATKR	12,123	$1,890	06/30/2023
PDT Partners LLC	11,831	$1,845	06/30/2023
ATKR	11,831	$1,845	06/30/2023
Navellier & Associates Inc	11,754	$1,833	06/30/2023
ATKR	11,754	$1,833	06/30/2023
Twelve Points Wealth Management LLC	11,656	$1,818	06/30/2023
ATKR	11,656	$1,818	06/30/2023
UniSuper Management Pty Ltd	11,376	$1,774	06/30/2023
ATKR	11,376	$1,774	06/30/2023
State Board of Administration of Florida Retirement System	11,248	$1,754	06/30/2023
ATKR	11,248	$1,754	06/30/2023
Arizona State Retirement System	11,096	$1,730	06/30/2023
ATKR	11,096	$1,730	06/30/2023
Virtus Investment Advisers Inc.	10,969	$1,711	06/30/2023
ATKR	10,969	$1,711	06/30/2023
Gotham Asset Management LLC	10,789	$1,682	06/30/2023
ATKR	10,789	$1,682	06/30/2023
Parallax Volatility Advisers L.P.		$1,559	06/30/2023
Call	10,000	$1,559	06/30/2023
Bayesian Capital Management LP	9,997	$1,559	06/30/2023
ATKR	9,997	$1,559	06/30/2023
Thrivent Financial for Lutherans	9,663	$1,507	06/30/2023
ATKR	9,663	$1,507	06/30/2023
Adams Wealth Management	9,495	$1,481	06/30/2023
ATKR	9,495	$1,481	06/30/2023
Strs Ohio	9,400	$1,465	06/30/2023
ATKR	9,400	$1,465	06/30/2023
Genus Capital Management Inc.	9,100	$1,419	06/30/2023
ATKR	9,100	$1,419	06/30/2023
PEAK6 Investments LLC		$1,372	06/30/2023
Call	20,600	$3,212	06/30/2023
Put	11,800	$1,840	06/30/2023
Graham Capital Management L.P.	8,637	$1,347	06/30/2023
ATKR	8,637	$1,347	06/30/2023
Steward Partners Investment Advisory LLC	8,467	$1,320	06/30/2023
ATKR	8,467	$1,320	06/30/2023
Walleye Trading LLC		$1,309	06/30/2023
Call	26,000	$4,054	06/30/2023
Put	17,600	$2,745	06/30/2023
SummerHaven Investment Management LLC	8,221	$1,282	06/30/2023
ATKR	8,221	$1,282	06/30/2023
Wolverine Trading LLC		$1,258	06/30/2023
Call	17,900	$2,781	06/30/2023
Put	9,800	$1,523	06/30/2023
K.J. Harrison & Partners Inc	8,037	$1,249	06/30/2023
ATKR	8,037	$1,249	06/30/2023
Oppenheimer Asset Management Inc.	7,949	$1,240	06/30/2023
ATKR	7,949	$1,240	06/30/2023
Captrust Financial Advisors	7,896	$1,231	06/30/2023
ATKR	7,896	$1,231	06/30/2023
Advisor Group Holdings Inc.	7,866	$1,226	06/30/2023
ATKR	7,866	$1,226	06/30/2023
MML Investors Services LLC	7,651	$1,193	06/30/2023
ATKR	7,651	$1,193	06/30/2023
Handelsbanken Fonder AB	7,600	$1,185	06/30/2023
ATKR	7,600	$1,185	06/30/2023
Stratos Wealth Advisors LLC	7,530	$1,174	06/30/2023
ATKR	7,530	$1,174	06/30/2023
Shell Asset Management Co.	7,523	$1,173	06/30/2023
ATKR	7,523	$1,173	06/30/2023
Dynamic Technology Lab Private Ltd	7,513	$1,171	06/30/2023
ATKR	7,513	$1,171	06/30/2023
Mackenzie Financial Corp	7,239	$1,117	06/30/2023
ATKR	7,239	$1,117	06/30/2023
Stifel Financial Corp	7,132	$1,112	06/30/2023
ATKR	7,132	$1,112	06/30/2023
Jennison Associates LLC	6,977	$1,088	06/30/2023
ATKR	6,977	$1,088	06/30/2023
MorganRosel Wealth Management LLC	6,954	$1,084	06/30/2023
ATKR	6,954	$1,084	06/30/2023
Jackson Creek Investment Advisors LLC	6,928	$1,080	06/30/2023
ATKR	6,928	$1,080	06/30/2023
Barometer Capital Management Inc.	6,680	$1,042	06/30/2023
ATKR	6,680	$1,042	06/30/2023
National Bank of Canada FI	6,760	$1,038	06/30/2023
ATKR	6,760	$1,038	06/30/2023
Meritage Portfolio Management	6,337	$988	06/30/2023
ATKR	6,337	$988	06/30/2023
Fractal Investments LLC	6,266	$977	06/30/2023
ATKR	6,266	$977	06/30/2023
Van ECK Associates Corp	6,094	$950	06/30/2023
ATKR	6,094	$950	06/30/2023
Amalgamated Bank	6,024	$939	06/30/2023
ATKR	6,024	$939	06/30/2023
Schonfeld Strategic Advisors LLC	5,965	$930	06/30/2023
ATKR	5,965	$930	06/30/2023
ARP Americas LP	5,856	$913	06/30/2023
ATKR	5,856	$913	06/30/2023
Walleye Capital LLC		$905	06/30/2023
Call	10,900	$1,700	06/30/2023
Put	5,100	$795	06/30/2023
Jump Financial LLC	5,677	$885	06/30/2023
ATKR	5,677	$885	06/30/2023
Lakewood Asset Management LLC	5,620	$876	06/30/2023
ATKR	5,620	$876	06/30/2023
Diametric Capital LP	5,608	$875	06/30/2023
ATKR	5,608	$875	06/30/2023
Willis Investment Counsel	5,585	$871	06/30/2023
ATKR	5,585	$871	06/30/2023
AIA Group Ltd	5,545	$865	06/30/2023
ATKR	5,545	$865	06/30/2023
US Bancorp DE	5,509	$859	06/30/2023
ATKR	5,509	$859	06/30/2023
Robotti Robert	5,500	$858	06/30/2023
ATKR	5,500	$858	06/30/2023
Occudo Quantitative Strategies LP	5,480	$855	06/30/2023
ATKR	5,480	$855	06/30/2023
Mariner LLC	5,383	$839	06/30/2023
ATKR	5,383	$839	06/30/2023
Cresset Asset Management LLC	5,356	$835	06/30/2023
ATKR	5,356	$835	06/30/2023
Public Employees Retirement Association of Colorado	5,313	$829	06/30/2023
ATKR	5,313	$829	06/30/2023
The PNC Financial Services Group Inc.	5,156	$804	06/30/2023
ATKR	5,156	$804	06/30/2023
ProShare Advisors LLC	5,154	$804	06/30/2023
ATKR	5,154	$804	06/30/2023
Fox Run Management L.L.C.	5,143	$802	06/30/2023
ATKR	5,143	$802	06/30/2023
Financial Gravity Asset Management Inc.	156	$801	06/30/2023
ATKR	156	$801	06/30/2023
Ifrah Financial Services Inc.	5,021	$783	06/30/2023
ATKR	5,021	$783	06/30/2023
Miller Value Partners LLC	5,000	$780	06/30/2023
ATKR	5,000	$780	06/30/2023
Cornercap Investment Counsel Inc.	4,954	$773	06/30/2023
ATKR	4,954	$773	06/30/2023
Janney Montgomery Scott LLC	4,905	$765	06/30/2023
ATKR	4,905	$765	06/30/2023
Prairiewood Capital LLC	4,823	$752	06/30/2023
ATKR	4,823	$752	06/30/2023
Hancock Whitney Corp	4,725	$737	06/30/2023
ATKR	4,725	$737	06/30/2023
Commonwealth Equity Services LLC	4,702	$733	06/30/2023
ATKR	4,702	$733	06/30/2023
EMC Capital Management	4,684	$730	06/30/2023
ATKR	4,684	$730	06/30/2023
Pictet Asset Management SA	4,661	$727	06/30/2023
ATKR	4,661	$727	06/30/2023
Pathstone Family Office LLC	4,632	$722	06/30/2023
ATKR	4,632	$722	06/30/2023
Bailard Inc.	4,600	$717	06/30/2023
ATKR	4,600	$717	06/30/2023
Measured Wealth Private Client Group LLC	4,479	$698	06/30/2023
ATKR	4,479	$698	06/30/2023
Weil Company Inc.	4,472	$697	06/30/2023
ATKR	4,472	$697	06/30/2023
Catalyst Capital Advisors LLC	4,435	$692	06/30/2023
ATKR	4,435	$692	06/30/2023
Raymond James Financial Services Advisors Inc.	4,301	$671	06/30/2023
ATKR	4,301	$671	06/30/2023
State of Wyoming	4,285	$668	06/30/2023
ATKR	4,285	$668	06/30/2023
Systematic Alpha Investments LLC	4,200	$655	06/30/2023
ATKR	4,200	$655	06/30/2023
Campbell & CO Investment Adviser LLC	4,145	$646	06/30/2023
ATKR	4,145	$646	06/30/2023
Lido Advisors LLC		$642	06/30/2023
ATKR	5,421	$845	06/30/2023
Put	1,300	$203	06/30/2023
Yorktown Management & Research Co Inc	3,800	$593	06/30/2023
ATKR	3,800	$593	06/30/2023
Balboa Wealth Partners	3,769	$588	06/30/2023
ATKR	3,769	$588	06/30/2023
Pitcairn Co.	3,722	$580	06/30/2023
ATKR	3,722	$580	06/30/2023
Aigen Investment Management LP	3,671	$572	06/30/2023
ATKR	3,671	$572	06/30/2023
New York State Teachers Retirement System	3,600	$561	06/30/2023
ATKR	3,600	$561	06/30/2023
Arkadios Wealth Advisors	3,556	$555	06/30/2023
ATKR	3,556	$555	06/30/2023
MAI Capital Management	3,525	$550	06/30/2023
ATKR	3,525	$550	06/30/2023
Dupont Capital Management Corp	3,427	$534	06/30/2023
ATKR	3,427	$534	06/30/2023
Empirical Finance LLC	3,409	$532	06/30/2023
ATKR	3,409	$532	06/30/2023
Y Intercept Hong Kong Ltd	3,351	$523	06/30/2023
ATKR	3,351	$523	06/30/2023
Ameritas Investment Partners Inc.	3,334	$520	06/30/2023
ATKR	3,334	$520	06/30/2023
Maverick Capital Ltd.	3,297	$514	06/30/2023
ATKR	3,297	$514	06/30/2023
Toroso Investments LLC	3,295	$514	06/30/2023
ATKR	3,295	$514	06/30/2023
Perigon Wealth Management LLC	3,277	$511	06/30/2023
ATKR	3,277	$511	06/30/2023
Cetera Investment Advisers	3,190	$497	06/30/2023
ATKR	3,190	$497	06/30/2023
WINTON GROUP Ltd	3,151	$491	06/30/2023
ATKR	3,151	$491	06/30/2023
LPL Financial LLC	3,089	$482	06/30/2023
ATKR	3,089	$482	06/30/2023
Intrust Bank NA	3,002	$468	06/30/2023
ATKR	3,002	$468	06/30/2023
Glenmede Trust Co. NA	3,280	$461	06/30/2023
ATKR	3,280	$461	06/30/2023
Roman Butler Fullerton & Co.	2,820	$450	06/30/2023
ATKR	2,820	$450	06/30/2023
Sumitomo Mitsui Trust Holdings Inc.	2,868	$447	06/30/2023
ATKR	2,868	$447	06/30/2023
State of Tennessee Treasury Department	2,869	$447	06/30/2023
ATKR	2,869	$447	06/30/2023
DZ BANK AG Deutsche Zentral Genossenschafts Bank Frankfurt am Main	2,830	$441	06/30/2023
ATKR	2,830	$441	06/30/2023
Raymond James Trust N.A.	2,735	$427	06/30/2023
ATKR	2,735	$427	06/30/2023
Creative Planning	2,705	$422	06/30/2023
ATKR	2,705	$422	06/30/2023
Cerity Partners LLC	2,696	$420	06/30/2023
ATKR	2,696	$420	06/30/2023
Cambridge Investment Research Advisors Inc.	2,626	$409	06/30/2023
ATKR	2,626	$409	06/30/2023
Cubist Systematic Strategies LLC		$405	06/30/2023
Call	2,600	$405	06/30/2023
Neuberger Berman Group LLC	2,588	$404	06/30/2023
ATKR	2,588	$404	06/30/2023
Mitsubishi UFJ Trust & Banking Corp	2,545	$397	06/30/2023
ATKR	2,545	$397	06/30/2023
GWM Advisors LLC	2,532	$395	06/30/2023
ATKR	2,532	$395	06/30/2023
PFG Advisors	2,516	$392	06/30/2023
ATKR	2,516	$392	06/30/2023
CSS LLC IL	2,400	$374	06/30/2023
ATKR	2,400	$374	06/30/2023
Bridgefront Capital LLC	2,385	$372	06/30/2023
ATKR	2,385	$372	06/30/2023
Xponance Inc.	2,350	$366	06/30/2023
ATKR	2,350	$366	06/30/2023
Alps Advisors Inc.	2,293	$358	06/30/2023
ATKR	2,293	$358	06/30/2023
Cantor Fitzgerald L. P.	2,276	$355	06/30/2023
ATKR	2,276	$355	06/30/2023
Regions Financial Corp	2,238	$349	06/30/2023
ATKR	2,238	$349	06/30/2023
Public Employees Retirement System of Ohio	2,225	$347	06/30/2023
ATKR	2,225	$347	06/30/2023
New Vernon Capital Holdings II LLC	2,205	$344	06/30/2023
ATKR	2,205	$344	06/30/2023
Metropolitan Life Insurance Co NY	2,159	$337	06/30/2023
ATKR	2,159	$337	06/30/2023
Argent Trust Co	2,119	$330	06/30/2023
ATKR	2,119	$330	06/30/2023
Quantamental Technologies LLC	2,065	$322	06/30/2023
ATKR	2,065	$322	06/30/2023
Sawgrass Asset Management LLC	2,040	$318	06/30/2023
ATKR	2,040	$318	06/30/2023
CWM Advisors LLC	2,008	$313	06/30/2023
ATKR	2,008	$313	06/30/2023
Ritholtz Wealth Management	1,977	$308	06/30/2023
ATKR	1,977	$308	06/30/2023
Engineers Gate Manager LP	1,964	$306	06/30/2023
ATKR	1,964	$306	06/30/2023
Verition Fund Management LLC	1,953	$305	06/30/2023
ATKR	1,953	$305	06/30/2023
Merit Financial Group LLC	1,948	$304	06/30/2023
ATKR	1,948	$304	06/30/2023
Creative Financial Designs Inc. ADV	1,875	$292	06/30/2023
ATKR	1,875	$292	06/30/2023
Sfmg LLC	1,857	$290	06/30/2023
ATKR	1,857	$290	06/30/2023
Cetera Advisors LLC	1,791	$279	06/30/2023
ATKR	1,791	$279	06/30/2023
Empower Advisory Group LLC	1,777	$277	06/30/2023
ATKR	1,777	$277	06/30/2023
Prelude Capital Management LLC	1,773	$276	06/30/2023
ATKR	1,773	$276	06/30/2023
AE Wealth Management LLC	1,763	$275	06/30/2023
ATKR	1,763	$275	06/30/2023
Robeco Institutional Asset Management B.V.	1,741	$271	06/30/2023
ATKR	1,741	$271	06/30/2023
BI Asset Management Fondsmaeglerselskab A S	1,711	$267	06/30/2023
ATKR	1,711	$267	06/30/2023
RFG Advisory LLC	1,708	$266	06/30/2023
ATKR	1,708	$266	06/30/2023
Linden Thomas Advisory Services LLC	1,661	$259	06/30/2023
ATKR	1,661	$259	06/30/2023
Great West Life Assurance Co. Can	1,627	$255	06/30/2023
ATKR	1,627	$255	06/30/2023
GSA Capital Partners LLP	1,635	$255	06/30/2023
ATKR	1,635	$255	06/30/2023
SYSTM Wealth Solutions LLC	1,622	$253	06/30/2023
ATKR	1,622	$253	06/30/2023
Advisory Services Network LLC	1,546	$241	06/30/2023
ATKR	1,546	$241	06/30/2023
JustInvest LLC	1,536	$240	06/30/2023
ATKR	1,536	$240	06/30/2023
Centiva Capital LP	1,518	$237	06/30/2023
ATKR	1,518	$237	06/30/2023
Lattice Capital Management LLC	1,500	$234	06/30/2023
ATKR	1,500	$234	06/30/2023
Pinnacle Associates Ltd.	1,492	$233	06/30/2023
ATKR	1,492	$233	06/30/2023
Barnett & Company Inc.	1,480	$231	06/30/2023
ATKR	1,480	$231	06/30/2023
Baird Financial Group Inc.	1,429	$223	06/30/2023
ATKR	1,429	$223	06/30/2023
Colony Group LLC	1,419	$221	06/30/2023
ATKR	1,419	$221	06/30/2023
Apollon Wealth Management LLC	1,402	$219	06/30/2023
ATKR	1,402	$219	06/30/2023
Marietta Investment Partners LLC	1,399	$218	06/30/2023
ATKR	1,399	$218	06/30/2023
Capstone Investment Advisors LLC	1,396	$218	06/30/2023
ATKR	1,396	$218	06/30/2023
Cetera Advisor Networks LLC	1,392	$217	06/30/2023
ATKR	1,392	$217	06/30/2023
Inceptionr LLC	1,371	$214	06/30/2023
ATKR	1,371	$214	06/30/2023
Kestra Advisory Services LLC	1,327	$207	06/30/2023
ATKR	1,327	$207	06/30/2023
Teza Capital Management LLC	1,324	$206	06/30/2023
ATKR	1,324	$206	06/30/2023
EP Wealth Advisors LLC	15,422	$205	06/30/2023
ATKR	15,422	$205	06/30/2023
Two Sigma Securities LLC		$203	06/30/2023
Call	2,700	$421	06/30/2023
Put	1,400	$218	06/30/2023
Epic Trust Investment Advisors LLC	1,300	$203	06/30/2023
ATKR	1,300	$203	06/30/2023
Stokes Family Office LLC	1,288	$201	06/30/2023
ATKR	1,288	$201	06/30/2023
Covestor Ltd	1,292	$201	06/30/2023
ATKR	1,292	$201	06/30/2023
Tower Research Capital LLC TRC	1,060	$165	06/30/2023
ATKR	1,060	$165	06/30/2023
Penserra Capital Management LLC	992	$154	06/30/2023
ATKR	992	$154	06/30/2023
Stephenson National Bank & Trust	859	$134	06/30/2023
ATKR	859	$134	06/30/2023
SkyView Investment Advisors LLC	850	$133	06/30/2023
ATKR	850	$133	06/30/2023
Acadian Asset Management LLC	837	$130	06/30/2023
ATKR	837	$130	06/30/2023
Nisa Investment Advisors LLC	836	$130	06/30/2023
ATKR	836	$130	06/30/2023
Harvest Fund Management Co. Ltd	799	$125	06/30/2023
ATKR	799	$125	06/30/2023
Ronald Blue Trust Inc.	840	$118	06/30/2023
ATKR	840	$118	06/30/2023
SG Americas Securities LLC	720	$112	06/30/2023
ATKR	720	$112	06/30/2023
Huntington National Bank	610	$95	06/30/2023
ATKR	610	$95	06/30/2023
Virtus Fund Advisers LLC	578	$90	06/30/2023
ATKR	578	$90	06/30/2023
Benjamin Edwards Inc.	516	$80	06/30/2023
ATKR	516	$80	06/30/2023
Exchange Traded Concepts LLC	470	$73	06/30/2023
ATKR	470	$73	06/30/2023
Banque Cantonale Vaudoise	452	$70	06/30/2023
ATKR	452	$70	06/30/2023
Amundi	400	$62	06/30/2023
ATKR	400	$62	06/30/2023
Parkside Financial Bank & Trust	395	$62	06/30/2023
ATKR	395	$62	06/30/2023
Quadrant Capital Group LLC	347	$54	06/30/2023
ATKR	347	$54	06/30/2023
Spire Wealth Management	300	$47	06/30/2023
ATKR	300	$47	06/30/2023
Tilia Fiduciary Partners Inc.	257	$40	06/30/2023
ATKR	257	$40	06/30/2023
Lindbrook Capital LLC	212	$33	06/30/2023
ATKR	212	$33	06/30/2023
Salem Investment Counselors Inc.	207	$32	06/30/2023
ATKR	207	$32	06/30/2023
Aquatic Capital Management LLC	200	$31	06/30/2023
ATKR	200	$31	06/30/2023
Quarry LP	200	$31	06/30/2023
ATKR	200	$31	06/30/2023
ICA Group Wealth Management LLC	159	$25	06/30/2023
ATKR	159	$25	06/30/2023
Lee Financial Co	155	$24	06/30/2023
ATKR	155	$24	06/30/2023
Nomura Asset Management Co. Ltd.	150	$23	06/30/2023
ATKR	150	$23	06/30/2023
CWM LLC	149	$23	06/30/2023
ATKR	149	$23	06/30/2023
Key Financial Inc	145	$23	06/30/2023
ATKR	145	$23	06/30/2023
Signaturefd LLC	127	$20	06/30/2023
ATKR	127	$20	06/30/2023
First Horizon Advisors Inc.	126	$20	06/30/2023
ATKR	126	$20	06/30/2023
Geneos Wealth Management Inc.	126	$20	06/30/2023
ATKR	126	$20	06/30/2023
Proequities Inc.		$17	06/30/2023
ATKR	112	$17	06/30/2023
Put	0	$0	06/30/2023
Call	0	$0	06/30/2023
ST Germain D J Co. Inc.	110	$17	06/30/2023
ATKR	110	$17	06/30/2023
UMB Bank N A MO	104	$16	06/30/2023
ATKR	104	$16	06/30/2023
HighMark Wealth Management LLC	100	$16	06/30/2023
ATKR	100	$16	06/30/2023
Pacer Advisors Inc.	76	$12	06/30/2023
ATKR	76	$12	06/30/2023
Hexagon Capital Partners LLC	72	$11	06/30/2023
ATKR	72	$11	06/30/2023
RFP Financial Group LLC	69	$11	06/30/2023
ATKR	69	$11	06/30/2023
Farther Finance Advisors LLC	67	$10	06/30/2023
ATKR	67	$10	06/30/2023
Raleigh Capital Management Inc.	55	$9	06/30/2023
ATKR	55	$9	06/30/2023
Mendota Financial Group LLC	55	$9	06/30/2023
ATKR	55	$9	06/30/2023
Private Trust Co. NA	51	$8	06/30/2023
ATKR	51	$8	06/30/2023
Front Row Advisors LLC	50	$8	06/30/2023
ATKR	50	$8	06/30/2023
Hanseatic Management Services Inc.	44	$7	06/30/2023
ATKR	44	$7	06/30/2023
Cary Street Partners Investment Advisory LLC	45	$7	06/30/2023
ATKR	45	$7	06/30/2023
Allworth Financial LP	39	$6	06/30/2023
ATKR	39	$6	06/30/2023
SRS Capital Advisors Inc.	40	$6	06/30/2023
ATKR	40	$6	06/30/2023
JFS Wealth Advisors LLC	32	$5	06/30/2023
ATKR	32	$5	06/30/2023
First Capital Advisors Group LLC.	34	$5	06/30/2023
ATKR	34	$5	06/30/2023
EverSource Wealth Advisors LLC	35	$5	06/30/2023
ATKR	35	$5	06/30/2023
Tsfg LLC	29	$5	06/30/2023
ATKR	29	$5	06/30/2023
Bell Investment Advisors Inc	30	$5	06/30/2023
ATKR	30	$5	06/30/2023
Bollard Group LLC	24	$4	06/30/2023
ATKR	24	$4	06/30/2023
IFP Advisors Inc	19	$3	06/30/2023
ATKR	19	$3	06/30/2023
Parallel Advisors LLC	20	$3	06/30/2023
ATKR	20	$3	06/30/2023
Washington Trust Advisors Inc.	18	$3	06/30/2023
ATKR	18	$3	06/30/2023
Toth Financial Advisory Corp	10	$2	06/30/2023
ATKR	10	$2	06/30/2023
AdvisorNet Financial Inc	10	$2	06/30/2023
ATKR	10	$2	06/30/2023
Global Retirement Partners LLC	14	$2	06/30/2023
ATKR	14	$2	06/30/2023
Cornerstone Planning Group LLC	10	$2	06/30/2023
ATKR	10	$2	06/30/2023
SJS Investment Consulting Inc.	13	$2	06/30/2023
ATKR	13	$2	06/30/2023
West Tower Group LLC	15	$2	06/30/2023
ATKR	15	$2	06/30/2023
Harbour Investments Inc.	4	$1	06/30/2023
ATKR	4	$1	06/30/2023
Natixis	6	$1	06/30/2023
ATKR	6	$1	06/30/2023
Baker Avenue Asset Management LP	4	$1	06/30/2023
ATKR	4	$1	06/30/2023
Nelson Van Denburg & Campbell Wealth Management Group LLC	4	$1	06/30/2023
ATKR	4	$1	06/30/2023
Disciplined Investments LLC	8	$1	06/30/2023
ATKR	8	$1	06/30/2023
TFO TDC LLC	1	$0	06/30/2023
ATKR	1	$0	06/30/2023
Crewe Advisors LLC	1	$0	06/30/2023
ATKR	1	$0	06/30/2023
Versant Capital Management Inc	1	$0	06/30/2023
ATKR	1	$0	06/30/2023
Avion Wealth	4	$0	06/30/2023
ATKR	4	$0	06/30/2023
Glass Jacobson Investment Advisors llc	3	$0	06/30/2023
ATKR	3	$0	06/30/2023
Baldrige Asset Management LLC	3	$0	03/31/2023
ATKR	3	$0	03/31/2023
Twin Tree Management LP	78,900	$-13,847	06/30/2023
Put	167,700	$26,151	06/30/2023
Call	78,900	$12,304	06/30/2023

See Summary: Institutional Holders of ATKR
See Details: Top 10 Hedge Funds Holding ATKR
Also See: ATKR Insider Buying
Also See: ATKR Holdings Changes

ATKR — Current Quote

Quotes delayed 20 minutes Free ATKR Email Alerts: Get Dividend Alerts Get SEC Filing Alerts

ATKR — Performance