ArcelorMittal S.A.
ArcelorMittal S.A. (MT) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MT · as of Sep 30, 2025
Ownership Breakdown
278
Institutional Holders
▲ 18 vs Q2
$1.04B
Total Inst. Value
▲ $81.48M vs Q2
761.10M
Shares Outstanding
freeFloat 99.98%
28.65M
13F Shares Held
▼ 1.65M 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
MT largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
DIMENSIONAL FUND ADVISORS LP steel works, blast furnaces & rolling mills (coke ovens) | 3.17M | 41.29% | 41.29% | $114.65B | Nov 12, 2025 | ▲ 55.5K |
BANK OF NEW YORK MELLON CORP steel works, blast furnaces & rolling mills (coke ovens) | 1.95M | 25.34% | 25.34% | $70.35B | Nov 3, 2025 | ▼ 349.2K |
BLACKROCK, INC. steel works, blast furnaces & rolling mills (coke ovens) | 1.83M | 23.86% | 23.86% | $66.23B | Nov 12, 2025 | ▼ 194.2K |
MORGAN STANLEY steel works, blast furnaces & rolling mills (coke ovens) | 1.78M | 23.11% | 23.11% | $64.17B | May 27, 2026 | ▲ 86.4K |
MILLENNIUM MANAGEMENT LLC steel works, blast furnaces & rolling mills (coke ovens) | 1.74M | 22.72% | 22.72% | $63.07B | Nov 14, 2025 | ▲ 1.68M |
CONNOR, CLARK & LUNN INVESTMENT MANAGEMENT LTD. steel works, blast furnaces & rolling mills (coke ovens) | 1.65M | 21.43% | 21.43% | $59.50B | Nov 13, 2025 | ▼ 109.0K |
FMR LLC steel works, blast furnaces & rolling mills (coke ovens) | 1.32M | 17.18% | 17.18% | $47.71B | Nov 13, 2025 | ▼ 298.5K |
GOLDMAN SACHS GROUP INC steel works, blast furnaces & rolling mills (coke ovens) | 1.28M | 16.68% | 16.68% | $46.30B | Nov 14, 2025 | ▲ 57.7K |
UBS GROUP AG steel works, blast furnaces & rolling mills (coke ovens) | 1.18M | 15.38% | 15.38% | $42.71B | Nov 13, 2025 | ▲ 947.5K |
MAPLE ROCK CAPITAL PARTNERS INC. steel works, blast furnaces & rolling mills (coke ovens) | 1.15M | 14.91% | 14.91% | $41.40B | Nov 14, 2025 | NEW |
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
24
Increased
+4.60M shares3
New Positions
first time holders20
Decreased
−2.81M shares0
Sold Out
fully exitedNet shares change (top 50)
+1.79M
+4.60M / −2.81M
Net new holders
+7
3 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
MT insider trading · insider activity
Source: SEC Form 4
Recent Insider Transactions
Showing 10 most recent · Common Stock only
No recent insider transactions reported.
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
ArcelorMittal S.A. (MT) is primarily owned by institutional investors, who hold approximately 3.8% of total shares outstanding. Company insiders own approximately 0.02%, while retail and public investors account for the remaining 96.22%.
The largest institutional shareholder of ArcelorMittal S.A. is DIMENSIONAL FUND ADVISORS LP, holding approximately 3.17 million shares — equal to 41.29% of outstanding shares — as of September 30, 2025.
A total of 278 institutional investors currently hold MT stock, with a combined institutional value of approximately $1.04 billion as of the most recent 13F filing period.
Frequently asked questions
MT ownershipArcelorMittal S.A. (MT) is primarily owned by institutional investors, who hold approximately 3.8% of shares. The largest shareholder is DIMENSIONAL FUND ADVISORS LP with a 41.29% stake. Company insiders hold 0.02%. Data sourced from SEC Form 13F as of September 30, 2025.