Institutional ownership · Form 13F
MT institutional ownership
ArcelorMittal: reported institutional holdings as of 2026-06-30 (filed through 2026-08-31), aggregated by StockEyes from SEC Form 13F information tables. MT is one of 2732 tickers in the validated publication set. Mapping coverage in this publication set: 4562 of 6046 universe tickers have at least one validated CUSIP mapping (75.5%). Latest-quarter filed value resolved to any listed ticker: 77.3%; resolved to this universe: 77.2%.
MT: change since the prior quarter's filings
More managers reported a position, with the count rising from 296 in the quarter ended 2026-03-31 to 318 in the quarter ended 2026-06-30 (+22, 7.4%). Total reported shares rose to 37,322,583 (+8,593,545, 29.9%), moving the same way as the manager count. Among the 22 managers listed as top holders in both quarters, the largest increases were FMR LLC (+9,833,857 shares) and Maple Rock Capital Partners Inc. (+776,595 shares), among 10 managers who added shares, and the largest decreases were MORGAN STANLEY (-503,844 shares) and CITADEL ADVISORS LLC (-211,360 shares), among 10 managers who reduced shares. Castle Hook Partners LP (1,290,147 shares), SCOPUS ASSET MANAGEMENT, L.P. (500,000 shares) and 6 more entered the listed top holders; BANK OF MONTREAL /CAN/ (919,456 shares in the prior quarter), JANE STREET GROUP, LLC (608,569 shares in the prior quarter) and 6 more dropped out of the listed top holders.
New to 13F data? Read how to read a 13F filing, or see where institutions moved overall in the Smart Money Report.
Reported totals, quarter ended 2026-06-30
318 reporting managers held 37,322,583 shares, reported value $2,241,549,334 exactly as filed. Values are position values transcribed from the filings, not current market prices.
Reported quarter-over-quarter change (quarter ended 2026-03-31 to quarter ended 2026-06-30): reporting managers +22, reported shares +8,593,545 (+29.91%), reported value +55.39%. These changes compare two filing snapshots.
Shares outstanding check: 761,125,819 shares reported by the issuer (SEC XBRL, period ended 2025-12-31). Reported 13F shares equal 4.9% of that figure. This page passed the publication sanity gate before listing.
MT in this quarter's filings
Concentration check: the largest reported position, FMR LLC with 11,391,416 shares, is 30.5% of all shares reported for MT this quarter. The five largest reporting managers together account for 53.1% of the reported total, so the headline total is dominated by a handful of large managers.
Reported quarter-over-quarter change: the reporting-manager count rose by 22 versus the quarter ended 2026-03-31, and reported shares moved +29.91% (+8,593,545 shares). That is a comparison of two filing snapshots, not a record of trades on any single day.
Shares-outstanding cross-check: reported 13F shares equal 4.9% of the issuer share count used at the publication gate (761,125,819 shares, issuer period ended 2025-12-31). The gate publishes a ticker only when that relationship is plausible; lending chains can push reported totals above a simple ownership share, which is why the figure is a sanity check and not an ownership percentage.
Largest reporting managers, MT
| # | Manager | Shares | Value as filed | Share of reported total |
|---|---|---|---|---|
| 1 | FMR LLC | 11,391,416 | $685,991,127 | 30.5% |
| 2 | DIMENSIONAL FUND ADVISORS LP | 3,253,361 | $195,915,055 | 8.7% |
| 3 | Maple Rock Capital Partners Inc. | 2,190,860 | $131,933,589 | 5.9% |
| 4 | MORGAN STANLEY | 1,503,680 | $90,551,685 | 4.0% |
| 5 | BlackRock, Inc. | 1,471,254 | $88,598,875 | 3.9% |
| 6 | GOLDMAN SACHS GROUP INC | 1,299,500 | $78,255,866 | 3.5% |
| 7 | Castle Hook Partners LP | 1,290,147 | $77,692,652 | 3.5% |
| 8 | Bank of New York Mellon Corp | 942,040 | $56,729,661 | 2.5% |
| 9 | Connor, Clark & Lunn Investment Management Ltd. | 934,168 | $56,255,597 | 2.5% |
| 10 | AMERICAN CENTURY COMPANIES INC | 828,040 | $49,864,569 | 2.2% |
| 11 | Man Group plc | 756,328 | $45,546,072 | 2.0% |
| 12 | Retirement Systems of Alabama | 674,150 | $40,597,313 | 1.8% |
| 13 | BANK OF AMERICA CORP /DE/ | 525,303 | $31,633,747 | 1.4% |
| 14 | SCOPUS ASSET MANAGEMENT, L.P. | 500,000 | $30,110,000 | 1.3% |
| 15 | NORTHERN TRUST CORP | 495,593 | $29,844,611 | 1.3% |
Manager names and figures are transcribed from each manager's own Form 13F information table. A manager listing shares in this snapshot does not mean it holds them today.
Reported change, 2026-03-31 to 2026-06-30
| Quarter ended | Filed through | Reporting managers | Reported shares | Value as filed |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-29 | 296 | 28,729,038 | $1,442,505,576 |
| 2026-06-30 | 2026-08-31 | 318 | 37,322,583 | $2,241,549,334 |
Every change figure on this page is a reported quarter-over-quarter change between filing snapshots. It is not real-time trading activity.
MT reported totals over time
Quarter ended 2026-06-30: 318 reporting managers · 37,322,583 reported shares · $2,241,549,334 value as filed.
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Quarter-end 13F filed data, long positions only; filings arrive up to 45 days after quarter end.
CUSIPs behind the MT total
The validated bridge mapped 1 current CUSIP(s) to MT for this quarter: 03938L203. Option pseudo-CUSIPs, units, warrants, and preferred classes are excluded from these common-share totals. Mapping coverage in this publication set: 4562 of 6046 universe tickers have at least one validated CUSIP mapping (75.5%). Latest-quarter filed value resolved to any listed ticker: 77.3%; resolved to this universe: 77.2%.
What this page is and is not
Form 13F reports are quarterly holdings snapshots. Managers file up to about 45 days after quarter-end, so these figures describe reported positions as of the quarter-end date, not holdings today. 13F lists reportable long positions from managers above the SEC reporting threshold and omits short positions entirely.
This page is informational only. It is not investment advice, a recommendation, or a signal to buy or sell. Source: SEC Form 13F bulk data set for filings through 2026-08-31 (period ended 2026-06-30), joined to tickers through StockEyes' validated CUSIP bridge. Methodology and coverage are documented on the institutional ownership hub.
Insider transactions for MT (officer and director buys and sells) are covered by InsiderTrace: insidertrace.com/stock/mt. StockEyes does not duplicate insider transaction tables.
Related StockEyes pages
Latest headlines tagged MT are on the market news wire. Upcoming earnings and market dates are on the events calendar. The term itself is defined in the institutional investor glossary entry, and the research workflow behind pages like this one is walked through in how to research a stock and how to compare SEC filings.