Millennium Management’s ATI ATI Stock Holding History

Millennium Management’s Portfolio ATI Stock Details ATI Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$364K	Sell	2,500 -2,400	-49%	-$334K	﹤0.01%	4922
2025 Q4	$562K	Buy	+4,900	New	+$478K	﹤0.01%	4866
2025 Q2	–	Sell	-4,600	Closed	-$239K	–	5842
2025 Q1	$239K	Buy	+4,600	New	+$261K	﹤0.01%	5209
2024 Q2	–	Sell	-10,000	Closed	-$512K	–	5861
2024 Q1	$512K	Sell	10,000 -600	-6%	-$27.1K	﹤0.01%	4799
2023 Q4	$482K	Sell	10,600 -20,800	-66%	-$864K	﹤0.01%	4670
2023 Q3	$1.29M	Sell	31,400 -34,300	-52%	-$1.52M	﹤0.01%	3980
2023 Q2	$2.91M	Buy	+65,700	New	+$2.51M	﹤0.01%	3157
2018 Q3	–	Sell	-500,000	Closed	-$12.6M	–	3871
2018 Q2	$12.6M	Buy	+500,000	New	+$13.5M	0.02%	1165
2014 Q4	–	Sell	-6,900	Closed	-$256K	–	3892
2014 Q3	$256K	Buy	+6,900	New	+$290K	﹤0.01%	3212
2014 Q2	–	Sell	-8,900	Closed	-$335K	–	3372
2014 Q1	$335K	Buy	+8,900	New	+$299K	﹤0.01%	2873

Other funds holding ATI

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

Viking Global Investors Stamford, Connecticut $35.7B AUM 21.3% 1-Year Est. Return

Millennium Management's ATI Position: Q1 2026 in Review

Millennium Management increased its ATI (ATI) stake by 22% in Q1 2026, buying an estimated $15.6M and bringing the position to 619,240 shares worth $90.1M. The position accounts for 0.04% of the portfolio, ranked #494.

Millennium Management first reported a position in ATI in Q2 2013 and has held it in 50 quarters since. The position peaked at $108M in Q2 2024. 673 funds tracked by Wall St. Rank hold ATI as of Q1 2026.

Millennium Management held 619,240 shares of ATI worth $90.1M as of Q1 2026.
Millennium Management bought 112,359 ATI shares in Q1 2026, an estimated $15.6M.
ATI made up 0.04% of Millennium Management's portfolio in Q1 2026, its #494 holding.
Millennium Management first reported a position in ATI in Q2 2013 and has held it in 50 quarters since.
Millennium Management's ATI position peaked at $108M in Q2 2024.
673 funds tracked by Wall St. Rank held ATI as of Q1 2026.

Based on Millennium Management's 13F filing for Q1 2026, filed 15 May 2026.