# ATI INC (ATI) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 01741R102
Page URL: https://superinvestorclub.com/stock/ATI
Last updated: 2026-08-29T13:48:34.085Z

## Summary

As of the most recent 13F filing period, ATI INC (ATI) is held by 4 tracked superinvestors with an aggregate position value of $414.7M representing 0115388081923611494015985 shares.

## Top institutional holders (4)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Andreas Halvorsen](https://superinvestorclub.com/manager/59) | Viking Global Investors | 1153880 | $227.4M | 0.65% | 2026-06-30 |
| 2 | [Polen Capital](https://superinvestorclub.com/manager/271) | Polen Capital Management | 819236 | $161.5M | 1.39% | 2026-06-30 |
| 3 | [Ray Dalio](https://superinvestorclub.com/manager/6) | Bridgewater Associates | 114940 | $22.7M | 0.09% | 2026-06-30 |
| 4 | [FPA Queens Road](https://superinvestorclub.com/manager/97) | Bragg Financial Advisors | 15985 | $3.2M | 0.08% | 2026-06-30 |

## Ownership history (quarter-over-quarter)

- 2024-12-31: 1 holders, $4.2M aggregate, 076732 shares
- 2025-03-31: 1 holders, $16.5M aggregate, 0318044 shares
- 2025-09-30: 2 holders, $12.4M aggregate, 013645815374 shares
- 2025-12-31: 1 holders, $1.8M aggregate, 015985 shares
- 2026-03-31: 3 holders, $490.3M aggregate, 033328432195015985 shares
- 2026-06-30: 4 holders, $414.7M aggregate, 0115388081923611494015985 shares

## Recent congressional trades (0)


## Recent insider transactions (0)


## Citation

When citing, use: "ATI INC (ATI) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/ATI), aggregating SEC 13F, Form 4, and congressional disclosures."