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ATI INC

ATI

Holders

2

Combined Value

$492.48M

Combined Shares

3,385,675

Current Price

$198.48

52W High

$203.60

vs 52W High

−2.5%

Investor Activity Chart

Quarterly buys (▲) and sells (▼) by tracked investors. Click a marker to view that investor's portfolio; hover for details. Price line is implied from 13F filings (value ÷ shares), not market data.

$33.34$76.94$120.55$164.15Q2'24Q3'24Q4'24Q1'25Q2'25Q3'25Q4'25Q1'26Q2 2024 · implied price $55.45Q3 2024 · implied price $66.91Q4 2024 · implied price $55.04Q1 2025 · implied price $52.03Q2 2025 · implied price $86.34Q3 2025 · implied price $81.34Q1 2026 · implied price $145.46Jim Simons - Renaissance Technologies · bought 180,192 shares @ ~$55.45 · Q2 2024 (new position)George Soros - Soros Fund Management · bought 177,047 shares @ ~$55.45 · Q2 2024 (new position)George Soros - Soros Fund Management · bought 20,409 shares @ ~$66.91 · Q3 2024Jim Simons - Renaissance Technologies · sold 92,000 shares @ ~$66.91 · Q3 2024George Soros - Soros Fund Management · bought 194,045 shares @ ~$55.04 · Q4 2024Jim Simons - Renaissance Technologies · bought 90,000 shares @ ~$55.04 · Q4 2024George Soros - Soros Fund Management · bought 222,383 shares @ ~$52.03 · Q1 2025Jim Simons - Renaissance Technologies · sold 4,300 shares @ ~$52.03 · Q1 2025Jim Simons - Renaissance Technologies · bought 307,800 shares @ ~$86.34 · Q2 2025George Soros - Soros Fund Management · sold 251,189 shares @ ~$86.34 · Q2 2025George Soros - Soros Fund Management · sold 362,695 shares @ ~$86.34 · Q3 2025 (sold out)Jim Simons - Renaissance Technologies · sold 221,700 shares @ ~$81.34 · Q3 2025Andreas Halvorsen - Viking Global Investors · bought 3,332,843 shares @ ~$145.46 · Q1 2026 (new position)George Soros - Soros Fund Management · bought 52,832 shares @ ~$145.46 · Q1 2026 (new position)Jim Simons - Renaissance Technologies · sold 259,992 shares @ ~$81.34 · Q4 2025 (sold out)BUYSELLIMPLIED PRICE

Held By

Tracked investors currently holding this security, based on each investor's most recent 13F filing. Gain compares the current market price to each investor's estimated average buy price.

InvestorValue% of PortfolioAvg Buy PriceGainLast ActivityAs of
Andreas Halvorsen - Viking Global Investors$484.80M1.36%~$145.46+36.4%BUY Q1 2026Q1 2026
George Soros - Soros Fund Management$7.68M0.08%~$145.46+36.4%BUY Q1 2026Q1 2026

Recent Activity

Latest position changes by tracked investors. Prices are estimates implied from 13F filings.

QuarterInvestorActionEst. ValueEst. Price
Q1 2026Andreas Halvorsen - Viking Global InvestorsNEW BUY+$484.80M~$145.46
Q1 2026George Soros - Soros Fund ManagementNEW BUY+$7.68M~$145.46
Q4 2025Jim Simons - Renaissance TechnologiesSOLD OUT−$21.15M~$81.34
Q3 2025George Soros - Soros Fund ManagementSOLD OUT−$31.32M~$86.34
Q3 2025Jim Simons - Renaissance TechnologiesSELL−$18.03M~$81.34
Q2 2025Jim Simons - Renaissance TechnologiesBUY+$26.58M~$86.34
Q2 2025George Soros - Soros Fund ManagementSELL−$21.69M~$86.34
Q1 2025George Soros - Soros Fund ManagementBUY+$11.57M~$52.03
Q1 2025Jim Simons - Renaissance TechnologiesSELL−$223.7K~$52.03
Q4 2024George Soros - Soros Fund ManagementBUY+$10.68M~$55.04
Q4 2024Jim Simons - Renaissance TechnologiesBUY+$4.95M~$55.04
Q3 2024Jim Simons - Renaissance TechnologiesSELL−$6.16M~$66.91
Q3 2024George Soros - Soros Fund ManagementBUY+$1.37M~$66.91
Q2 2024Jim Simons - Renaissance TechnologiesNEW BUY+$9.99M~$55.45
Q2 2024George Soros - Soros Fund ManagementNEW BUY+$9.82M~$55.45

Ownership History

Aggregate position across all tracked investors per quarter (options excluded). Implied price is the reported value divided by shares held.

PeriodHoldersTotal SharesΔ SharesTotal ValueImplied Price
Q1 202623,385,675+1202.2%$492.48M$145.46
Q3 20251259,992-69.2%$21.15M$81.34
Q2 20252844,387+7.2%$72.90M$86.34
Q1 20252787,776+38.3%$40.99M$52.03
Q4 20242569,693+99.4%$31.36M$55.04
Q3 20242285,648-20.0%$19.11M$66.91
Q2 20242357,239—$19.81M$55.45