Adage Capital Partners’s AtaiBeckley Inc ATAI Stock Holding History

Adage Capital Partners’s Portfolio ATAI Stock Details ATAI Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$29.7M	Hold	5,642,758	–	–	0.04%	394
2026 Q1	$20M	Sell	5,642,758 -1,437,088	-20%	-$5.41M	0.03%	465
2025 Q4	$29M	Buy	7,079,846 +1,645,064	+30%	+$7.76M	0.04%	379
2025 Q3	$28.7M	Hold	5,434,782	–	–	0.05%	371
2025 Q2	$11.9M	Buy	+5,434,782	New	+$9.74M	0.02%	583

Other funds holding ATAI

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

DTC

Deep Track Capital Greenwich, Connecticut $6.87B AUM 205.24% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Candriam SCA Strassen, Luxembourg, Luxembourg $22.2B AUM 58.34% 1-Year Est. Return

FCMV

Foresite Capital Management VI Larkspur, California $643M AUM 343.43% 1-Year Est. Return

Adage Capital Partners's ATAI Position: Q2 2026 in Review

Adage Capital Partners held its AtaiBeckley Inc (ATAI) position steady in Q2 2026 at 5,642,758 shares worth $29.7M. The position accounts for 0.04% of the portfolio, ranked #394.

Adage Capital Partners first reported a position in ATAI in Q2 2025 and has held it in 5 quarters since. 242 funds tracked by Wall St. Rank hold ATAI as of Q2 2026.

Adage Capital Partners held 5,642,758 shares of AtaiBeckley Inc worth $29.7M as of Q2 2026.
Adage Capital Partners left its AtaiBeckley Inc share count unchanged in Q2 2026.
AtaiBeckley Inc made up 0.04% of Adage Capital Partners's portfolio in Q2 2026, its #394 holding.
Adage Capital Partners first reported a position in AtaiBeckley Inc in Q2 2025 and has held it in 5 quarters since.
242 funds tracked by Wall St. Rank held AtaiBeckley Inc as of Q2 2026.

Based on Adage Capital Partners's 13F filing for Q2 2026, filed 14 Aug 2026.