Stock Ownership/ATAI

ATAIBECKLEY INC (ATAI): Ownership & Insider Activity

Hedge funds and institutional managers reporting a position in ATAI · Health Care. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.

Reported Holders
18
13F filers
Aggregate Value
$72.8M
Across holders
Last Price
$7.38
2026-08-24
Sector
Health Care
GICS
Quarterly fund activity8 increased6 reduced5 exited
Full exits: Point72 Asset Management, L.P., Hudson Bay Capital Management LP, Schonfeld Strategic Advisors LLC, Qube Research & Technologies Ltd, Brevan Howard Capital Management LP
Institutional Holders of ATAI
↗
18 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
ADAGE CAPITAL PARTNERS GP, L.L.C.
CIK 0001165408
Hedge Fund5.64M$29.7M40.9%0.0%Unchanged+$0Q2 2026
CITADEL ADVISORS LLC
CIK 0001423053
Hedge Fund2.11M$11.1M15.3%0.0%Added+$10.0MQ2 2026
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
Hedge Fund1.77M$9.3M12.8%0.0%Reduced$-13.7MQ2 2026
MOORE CAPITAL MANAGEMENT, LP
CIK 0001448574
Hedge Fund952K$5.0M6.9%0.1%Unchanged+$0Q2 2026
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
Hedge Fund822K$4.3M6.0%0.0%Reduced$-6.1MQ2 2026
ORBIMED ADVISORS LLC
CIK 0001055951
Hedge Fund798K$4.2M5.8%0.1%Added+$2.4MQ2 2026
Woodline Partners LP
CIK 0001784547
Hedge Fund600K$3.2M4.3%0.0%Unchanged+$0Q2 2026
Man Group plc
CIK 0001637460
Hedge Fund359K$1.9M2.6%0.0%Reduced$-973KQ2 2026
Rockefeller Capital Management L.P.
CIK 0001739439
Hedge Fund189K$996K1.4%0.0%Added+$53KQ2 2026
MARSHALL WACE, LLP
CIK 0001318757
Hedge Fund110K$580K0.8%0.0%Reduced$-5.0MQ2 2026
ADAGE CAPITAL PARTNERS GP, L.L.C.Unchanged
Hedge Fund
$29.7M· 40.9% of total· 0.0% port· 5.64M sh· +$0 QoQ· Q2 2026
CITADEL ADVISORS LLCAdded
Hedge Fund
$11.1M· 15.3% of total· 0.0% port· 2.11M sh· +$10.0M QoQ· Q2 2026
MILLENNIUM MANAGEMENT LLCReduced
Hedge Fund
$9.3M· 12.8% of total· 0.0% port· 1.77M sh· $-13.7M QoQ· Q2 2026
MOORE CAPITAL MANAGEMENT, LPUnchanged
Hedge Fund
$5.0M· 6.9% of total· 0.1% port· 952K sh· +$0 QoQ· Q2 2026
TWO SIGMA INVESTMENTS, LPReduced
Hedge Fund
$4.3M· 6.0% of total· 0.0% port· 822K sh· $-6.1M QoQ· Q2 2026
ORBIMED ADVISORS LLCAdded
Hedge Fund
$4.2M· 5.8% of total· 0.1% port· 798K sh· +$2.4M QoQ· Q2 2026
Woodline Partners LPUnchanged
Hedge Fund
$3.2M· 4.3% of total· 0.0% port· 600K sh· +$0 QoQ· Q2 2026
Man Group plcReduced
Hedge Fund
$1.9M· 2.6% of total· 0.0% port· 359K sh· $-973K QoQ· Q2 2026
Rockefeller Capital Management L.P.Added
Hedge Fund
$996K· 1.4% of total· 0.0% port· 189K sh· +$53K QoQ· Q2 2026
MARSHALL WACE, LLPReduced
Hedge Fund
$580K· 0.8% of total· 0.0% port· 110K sh· $-5.0M QoQ· Q2 2026
Lighthouse Investment Partners, LLCAdded
Hedge Fund
$545K· 0.7% of total· 0.0% port· 103K sh· +$477K QoQ· Q2 2026
TUDOR INVESTMENT CORP ET ALAdded
Hedge Fund
$432K· 0.6% of total· 0.0% port· 82K sh· — QoQ· Q2 2026
Squarepoint Ops LLCReduced
Hedge Fund
$330K· 0.5% of total· 0.0% port· 63K sh· $-2.1M QoQ· Q2 2026
Walleye Capital LLCAdded
Hedge Fund
$321K· 0.4% of total· 0.0% port· 61K sh· — QoQ· Q2 2026
BALYASNY ASSET MANAGEMENT LLCAdded
Hedge Fund
$265K· 0.4% of total· 0.0% port· 50K sh· — QoQ· Q2 2026
Ruane, Cunniff & Goldfarb L.P.Unchanged
Hedge Fund
$222K· 0.3% of total· 0.0% port· 42K sh· +$0 QoQ· Q2 2026
AQR CAPITAL MANAGEMENT LLCAdded
Hedge Fund
$183K· 0.3% of total· 0.0% port· 35K sh· +$177K QoQ· Q2 2026
SHAW D E & CO INCReduced
Hedge Fund
$77K· 0.1% of total· 0.0% port· 15K sh· $-67K QoQ· Q2 2026
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