$MT

$61.11 +$1.68 (2.83%) Close

$MT Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 761.1M shares outstanding

Who owns MT?

By type of holder

Institutions 0.0% Everyone else 100.0%

No insider has reported a holding in the last two years, so insiders are counted in "Everyone else".

Concentration Top 2 holders own 36.2%

Lumen Investments S.A R.L. 36.2% · Byrne Asset Management LLC 0.0%

Institutional ownership

0.0%

0.0 pts vs last qtr

Institutional holders

0 vs last qtr

Net shares bought

−150

by institutions in Q2 2026

New / sold out

0 / 0

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

None.

Biggest sellers in Q2 2026

Byrne Asset Management LLC −150

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for ArcelorMittal SA in the last 12 months.

Is your stake being diluted?

There are not yet two fiscal years of reported share counts for ArcelorMittal SA.

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years0% Under 1 year100%

Quarterly turnover

25.0%

of institutional shares changed hands

Top 10 managers, median time held

1 quarter

Super Investors

Investment managers reporting MT on Form 13F

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
BA Byrne Asset Management LLC	150	0.00%	−150 (−50.0%)		Q1 '26	0.0%
Shares held by quarter Peak holding450 (Q1'25) Change over 8 quarters+150 Share of the company0.000% Byrne Asset Management LLC's full portfolio →

Byrne Asset Management LLC

150

% of company

0.00%

Change vs last qtr

−150 (−50.0%)

Held since

Q1 '26

Institutional Funds

Mutual funds and ETFs reporting MT on Form N-PORT; together they hold 0.0% of the company

No fund reports holding MT yet.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
LI Lumen Investments S.A R.L. 5%+ holder 13D · 36.2%	275.8M	36.24%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company36.240% Disclosed stake13D · 36.2% View the 13D/G filing →

Lumen Investments S.A R.L.

5%+ holder13D · 36.2%

275.8M

% of company

36.24%

Change vs last qtr

—

Held since

—

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