On this page, we present all of the funds holding ATAI from our database of 13F filers, detailed in the table below. The first column indicates the name of each of the funds holding ATAI, with a link to that fund's top holdings. The next columns indicate the amount of ATAI stock held by each of the funds holding ATAI, followed by the ATAI position size held by the fund, and lastly the date of the quarterly filing period the data represents. In total, we count 91 funds holding ATAI within the last two filing periods in our coverage universe of 13F filers, with the largest position size having been reported by Morgan Stanley. For more details on the positions held by Morgan Stanley (or by any of the other funds holding ATAI), click the fund name in the "Holder" column of the funds-holding-ATAI table below.

Holder	Amount	Position Size ($ in 1000's)	As of
Morgan Stanley	3,146,581	$4,437	12/31/2023
ATAI	3,146,581	$4,437	12/31/2023
BlackRock Inc.	1,360,204	$1,918	12/31/2023
ATAI	1,360,204	$1,918	12/31/2023
Marshall Wace LLP	775,889	$1,094	12/31/2023
ATAI	775,889	$1,094	12/31/2023
Millennium Management LLC	760,756	$1,073	12/31/2023
ATAI	760,756	$1,073	12/31/2023
Brown University	718,500	$1,013	12/31/2023
ATAI	718,500	$1,013	12/31/2023
Mirae Asset Global Investments Co. Ltd.	623,677	$879	12/31/2023
ATAI	623,677	$879	12/31/2023
Bank of America Corp DE	558,637	$788	12/31/2023
ATAI	558,637	$788	12/31/2023
Citadel Advisors LLC		$634	12/31/2023
ATAI	426,107	$601	12/31/2023
Call	28,700	$40	12/31/2023
Put	5,100	$7	12/31/2023
Two Sigma Investments LP	415,743	$586	12/31/2023
ATAI	415,743	$586	12/31/2023
Vanguard Group Inc.	409,462	$577	12/31/2023
ATAI	409,462	$577	12/31/2023
Franklin Resources Inc.	356,357	$502	12/31/2023
ATAI	356,357	$502	12/31/2023
JPMorgan Chase & Co.	318,014	$448	12/31/2023
ATAI	318,014	$448	12/31/2023
Cresset Asset Management LLC	311,613	$439	12/31/2023
ATAI	311,613	$439	12/31/2023
Tejara Capital Ltd	290,215	$409	12/31/2023
ATAI	290,215	$409	12/31/2023
Barclays PLC	245,717	$346	12/31/2023
ATAI	245,717	$346	12/31/2023
AdvisorShares Investments LLC	195,869	$276	12/31/2023
ATAI	195,869	$276	12/31/2023
Susquehanna International Group LLP		$262	12/31/2023
ATAI	148,813	$210	12/31/2023
Call	37,100	$52	12/31/2023
Hyperion Capital Advisors LP	168,416	$237	12/31/2023
ATAI	168,416	$237	12/31/2023
Jane Street Group LLC	158,320	$223	12/31/2023
ATAI	158,320	$223	12/31/2023
Group One Trading L.P.		$206	12/31/2023
Call	166,200	$234	12/31/2023
Put	20,000	$28	12/31/2023
HRT Financial LP	130,849	$184	12/31/2023
ATAI	130,849	$184	12/31/2023
Qube Research & Technologies Ltd	128,494	$181	12/31/2023
ATAI	128,494	$181	12/31/2023
Geode Capital Management LLC	117,226	$165	12/31/2023
ATAI	117,226	$165	12/31/2023
Goldman Sachs Group Inc.	111,644	$157	12/31/2023
ATAI	111,644	$157	12/31/2023
D. E. Shaw & Co. Inc.	108,168	$153	12/31/2023
ATAI	108,168	$153	12/31/2023
XTX Topco Ltd	101,487	$143	12/31/2023
ATAI	101,487	$143	12/31/2023
Quattro Financial Advisors LLC	70,976	$140	03/31/2024
ATAI	70,976	$140	03/31/2024
Cerity Partners LLC	97,965	$138	12/31/2023
ATAI	97,965	$138	12/31/2023
State Street Corp	87,078	$123	12/31/2023
ATAI	87,078	$123	12/31/2023
Objectivity Squared LLC	44,261	$87	03/31/2024
ATAI	44,261	$87	03/31/2024
Two Sigma Advisers LP	61,400	$87	12/31/2023
ATAI	61,400	$87	12/31/2023
Diametric Capital LP	53,129	$75	12/31/2023
ATAI	53,129	$75	12/31/2023
Credit Suisse AG	51,395	$72	12/31/2023
ATAI	51,395	$72	12/31/2023
Royal Bank of Canada	50,153	$72	12/31/2023
ATAI	50,153	$72	12/31/2023
Claudia M.P. Batlle CRP R LLC	49,922	$70	12/31/2023
ATAI	49,922	$70	12/31/2023
CI Private Wealth LLC	46,685	$66	12/31/2023
ATAI	46,685	$66	12/31/2023
HighTower Advisors LLC	44,939	$62	12/31/2023
ATAI	44,939	$62	12/31/2023
Kingswood Wealth Advisors LLC	30,000	$59	03/31/2024
ATAI	30,000	$59	03/31/2024
Ruane Cunniff & Goldfarb L.P.	42,112	$59	12/31/2023
ATAI	42,112	$59	12/31/2023
Cubist Systematic Strategies LLC	36,288	$51	12/31/2023
ATAI	36,288	$51	12/31/2023
Two Sigma Securities LLC	34,053	$48	12/31/2023
ATAI	34,053	$48	12/31/2023
UBS Group AG	30,883	$44	12/31/2023
ATAI	30,883	$44	12/31/2023
Commonwealth Equity Services LLC	29,578	$42	12/31/2023
ATAI	29,578	$42	12/31/2023
Freestone Capital Holdings LLC	30,000	$42	12/31/2023
ATAI	30,000	$42	12/31/2023
Virtu Financial LLC	29,140	$41	12/31/2023
ATAI	29,140	$41	12/31/2023
Creative Planning	28,218	$40	12/31/2023
ATAI	28,218	$40	12/31/2023
XML Financial LLC	27,457	$39	12/31/2023
ATAI	27,457	$39	12/31/2023
Hunter Perkins Capital Management LLC	19,241	$38	03/31/2024
ATAI	19,241	$38	03/31/2024
Simplex Trading LLC		$29	12/31/2023
ATAI	16,545	$23	12/31/2023
Call	5,200	$7	12/31/2023
Put	800	$1	12/31/2023
Sontag Advisory LLC	20,874	$29	12/31/2023
ATAI	20,874	$29	12/31/2023
Strategic Blueprint LLC	13,500	$27	03/31/2024
ATAI	13,500	$27	03/31/2024
Verdence Capital Advisors LLC	19,109	$27	12/31/2023
ATAI	19,109	$27	12/31/2023
China Universal Asset Management Co. Ltd.	19,206	$27	12/31/2023
ATAI	19,206	$27	12/31/2023
CRA Financial Services LLC	12,903	$25	03/31/2024
ATAI	12,903	$25	03/31/2024
Prelude Capital Management LLC	17,952	$25	12/31/2023
ATAI	17,952	$25	12/31/2023
Legal & General Group Plc	16,975	$24	12/31/2023
ATAI	16,975	$24	12/31/2023
Robertson Stephens Wealth Management LLC	16,721	$24	12/31/2023
ATAI	16,721	$24	12/31/2023
Resolute Partners Group	16,777	$24	12/31/2023
ATAI	16,777	$24	12/31/2023
Audent Global Asset Management LLC	16,837	$24	12/31/2023
ATAI	16,837	$24	12/31/2023
Tower Research Capital LLC TRC	15,525	$22	12/31/2023
ATAI	15,525	$22	12/31/2023
Detalus Advisors LLC	10,000	$20	03/31/2024
ATAI	10,000	$20	03/31/2024
Moneta Group Investment Advisors LLC	14,254	$20	12/31/2023
ATAI	14,254	$20	12/31/2023
Squarepoint Ops LLC	12,047	$17	12/31/2023
ATAI	12,047	$17	12/31/2023
ProShare Advisors LLC	10,607	$15	12/31/2023
ATAI	10,607	$15	12/31/2023
CIBC World Markets Inc.	10,007	$14	12/31/2023
ATAI	10,007	$14	12/31/2023
Conservest Capital Advisors Inc.	10,002	$14	12/31/2023
ATAI	10,002	$14	12/31/2023
Williams Jones Wealth Management LLC.	10,000	$14	12/31/2023
ATAI	10,000	$14	12/31/2023
Crewe Advisors LLC	5,540	$8	12/31/2023
ATAI	5,540	$8	12/31/2023
Gould Capital LLC	5,000	$7	12/31/2023
ATAI	5,000	$7	12/31/2023
Westside Investment Management Inc.	2,450	$5	03/31/2024
ATAI	2,450	$5	03/31/2024
Citigroup Inc.	3,233	$5	12/31/2023
ATAI	3,233	$5	12/31/2023
National Bank of Canada FI	1,993	$3	12/31/2023
ATAI	1,993	$3	12/31/2023
Global Retirement Partners LLC	1,080	$2	03/31/2024
ATAI	1,080	$2	03/31/2024
Advisory Services Network LLC	1,500	$2	12/31/2023
ATAI	1,500	$2	12/31/2023
Advisor Group Holdings Inc.	1,452	$2	12/31/2023
ATAI	1,452	$2	12/31/2023
Caldwell Sutter Capital Inc.	500	$1	03/31/2024
ATAI	500	$1	03/31/2024
CWM LLC	350	$1	03/31/2024
ATAI	350	$1	03/31/2024
Venturi Wealth Management LLC	300	$1	03/31/2024
ATAI	300	$1	03/31/2024
Daiwa Securities Group Inc.	468	$1	12/31/2023
ATAI	468	$1	12/31/2023
Tortoise Investment Management LLC	1,000	$1	12/31/2023
ATAI	1,000	$1	12/31/2023
Cornerstone Planning Group LLC	400	$1	12/31/2023
ATAI	400	$1	12/31/2023
TD Waterhouse Canada Inc.	400	$1	12/31/2023
ATAI	400	$1	12/31/2023
AlphaMark Advisors LLC	200	$0	03/31/2024
ATAI	200	$0	03/31/2024
JJJ Advisors Inc.	212	$0	03/31/2024
ATAI	212	$0	03/31/2024
Resources Management Corp CT ADV	1	$0	12/31/2023
ATAI	1	$0	12/31/2023
Proequities Inc.		$0	12/31/2023
Put	0	$0	12/31/2023
ATAI	0	$0	12/31/2023
Call	0	$0	12/31/2023
1832 Asset Management L.P.	100	$0	12/31/2023
ATAI	100	$0	12/31/2023
Toronto Dominion Bank	280	$0	12/31/2023
ATAI	280	$0	12/31/2023
Highlander Capital Management LLC	150	$0	12/31/2023
ATAI	150	$0	12/31/2023
Baystate Wealth Management LLC	300	$0	12/31/2023
ATAI	300	$0	12/31/2023
Global Frontier Investments LLC	0	$0	12/31/2023
ATAI	0	$0	12/31/2023
Naples Money Management LLC	100	$0	12/31/2023
ATAI	100	$0	12/31/2023