ATI Inc.
ATI Inc. (ATI) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ATI · as of Sep 30, 2025
Ownership Breakdown
502
Institutional Holders
▲ 6 vs Q2
$10.48B
Total Inst. Value
▼ $1.09B vs Q2
136.47M
Shares Outstanding
freeFloat 98.87%
128.80M
13F Shares Held
▼ 5.29M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ATI largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
CAPITAL INTERNATIONAL INVESTORS steel pipe & tubes | 17.15M | 12.27% | 12.27% | $1.39T | Nov 13, 2025 | ▲ 436.1K |
BLACKROCK, INC. steel pipe & tubes | 14.86M | 10.63% | 10.63% | $1.21T | Nov 12, 2025 | ▼ 89.8K |
VANGUARD GROUP INC steel pipe & tubes | 13.05M | 9.34% | 9.34% | $1.06T | Nov 7, 2025 | ▼ 276.2K |
CAPITAL WORLD INVESTORS steel pipe & tubes | 7.90M | 5.65% | 5.65% | $642.63B | Nov 13, 2025 | ▲ 1.08M |
STATE STREET CORP steel pipe & tubes | 6.04M | 4.32% | 4.32% | $491.48B | Nov 14, 2025 | ▲ 415.5K |
FMR LLC steel pipe & tubes | 4.90M | 3.50% | 3.50% | $398.50B | Nov 13, 2025 | ▲ 1.49M |
CAPITAL RESEARCH GLOBAL INVESTORS steel pipe & tubes | 3.22M | 2.31% | 2.31% | $262.32B | Nov 13, 2025 | — held |
INVESCO LTD. steel pipe & tubes | 3.15M | 2.25% | 2.25% | $256.38B | Nov 13, 2025 | ▼ 144.7K |
D. E. SHAW & CO., INC. steel pipe & tubes | 3.03M | 2.17% | 2.17% | $246.22B | Nov 14, 2025 | ▼ 486.8K |
DENDUR CAPITAL LP steel pipe & tubes | 2.69M | 1.92% | 1.92% | $218.74B | Nov 14, 2025 | ▼ 485.8K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
22
Increased
+7.03M shares1
New Positions
first time holders26
Decreased
−4.62M shares0
Sold Out
fully exitedNet shares change (top 50)
+2.41M
+7.03M / −4.62M
Net new holders
-3
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ATI insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
0
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Fields Kimberly A Chair, President and CEO | Jun 2, 2026 | Sale | 25,823 | $177.97 | $4.60M | 251.9K | Form 4 ↗ |
Fields Kimberly A Chair, President and CEO | Jun 2, 2026 | Sale | 13,865 | $179.05 | $2.48M | 238.1K | Form 4 ↗ |
Fields Kimberly A Chair, President and CEO | Jun 2, 2026 | Sale | 13,164 | $179.71 | $2.37M | 224.9K | Form 4 ↗ |
Fields Kimberly A Chair, President and CEO | Jun 2, 2026 | Sale | 1,896 | $180.80 | $342.8K | 223.0K | Form 4 ↗ |
Fields Kimberly A Chair, President and CEO | Jun 2, 2026 | Sale | 2,000 | $181.90 | $363.8K | 221.0K | Form 4 ↗ |
Fields Kimberly A Chair, President and CEO | Jun 2, 2026 | Sale | 3,001 | $182.75 | $548.4K | 218.0K | Form 4 ↗ |
Sharma Ruby director | May 19, 2026 | Award | 905 | — | — | 7.3K | Form 4 ↗ |
Morehouse David J director | May 19, 2026 | Award | 1,743 | — | — | 38.3K | Form 4 ↗ |
Lydon-Rodgers Jean director | May 19, 2026 | Award | 905 | — | — | 1.5K | Form 4 ↗ |
Lund Elizabeth Hefley director | May 19, 2026 | Award | 905 | — | — | 1.5K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
ATI Inc. (ATI) is primarily owned by institutional investors, who hold approximately 94.4% of total shares outstanding. Company insiders own approximately 1.13%, while retail and public investors account for the remaining 4.49%.
The largest institutional shareholder of ATI Inc. is CAPITAL INTERNATIONAL INVESTORS, holding approximately 17.15 million shares — equal to 12.27% of outstanding shares — as of September 30, 2025.
A total of 502 institutional investors currently hold ATI stock, with a combined institutional value of approximately $10.48 billion as of the most recent 13F filing period.
Frequently asked questions
ATI ownershipATI Inc. (ATI) is primarily owned by institutional investors, who hold approximately 94.4% of shares. The largest shareholder is CAPITAL INTERNATIONAL INVESTORS with a 12.27% stake. Company insiders hold 1.13%. Data sourced from SEC Form 13F as of September 30, 2025.