5 hedge funds and family offices disclose a ATI position in their latest SEC 13F filing — combined $495.9M in market value.
| # | Investor | Fund | Shares | Value | % of Portfolio | Filed |
|---|---|---|---|---|---|---|
| 1 | Viking Global | Viking Global Investors LP | 3,332,843 | $484.8M | 1.36% | 2026-03-31 |
| 2 | George Soros | Soros Fund Management LLC | 52,832 | $7.7M | 0.11% | 2026-03-31 |
| 3 | Ray Dalio | Bridgewater Associates LP | 21,950 | $3.2M | 0.01% | 2026-03-31 |
| 4 | Christopher Bloomstran | Semper Augustus Investments Group LLC | 1,120 | $129K | 0.02% | 2025-12-31 |
| 5 | Cathie Wood | ARK Investment Management LLC | 679 | $99K | 0.00% | 2026-03-31 |
As of the latest 13F window, 5 tracked superinvestors hold ATI. The largest disclosed position is Viking Global at $484.8M (1.4% of portfolio).
13F filings are due 45 days after each quarter end and capture long-equity positions held by U.S. institutional managers with $100M+ AUM. Use this page to see exactly who is buying ATI, how concentrated each position is, and the implied conviction level relative to the rest of each investor's book.
Key takeaways
5 hedge funds and family offices disclose a ATI position in their latest SEC 13F filing — combined $495.9M in market value.
| # | Investor | Fund | Shares | Value | % of Portfolio | Filed |
|---|---|---|---|---|---|---|
| 1 | Viking Global | Viking Global Investors LP | 3,332,843 | $484.8M | 1.36% | 2026-03-31 |
| 2 | George Soros | Soros Fund Management LLC | 52,832 | $7.7M | 0.11% | 2026-03-31 |
| 3 | Ray Dalio | Bridgewater Associates LP | 21,950 | $3.2M | 0.01% | 2026-03-31 |
| 4 | Christopher Bloomstran | Semper Augustus Investments Group LLC | 1,120 | $129K | 0.02% | 2025-12-31 |
| 5 | Cathie Wood | ARK Investment Management LLC | 679 | $99K | 0.00% | 2026-03-31 |
As of the latest 13F window, 5 tracked superinvestors hold ATI. The largest disclosed position is Viking Global at $484.8M (1.4% of portfolio).
13F filings are due 45 days after each quarter end and capture long-equity positions held by U.S. institutional managers with $100M+ AUM. Use this page to see exactly who is buying ATI, how concentrated each position is, and the implied conviction level relative to the rest of each investor's book.
Key takeaways
