MT · Insider trading · 13F holders · Congress trades
Arcelor Mittal NY Registry Shares NEW (MT)
Who is buying and selling MT: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 13
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 3
MT at a glance
- No open-market insider purchases or sales of MT were filed in the last 90 days.
- 13 13F filers hold MT among their 50 largest positions, worth $291.0M combined. The biggest bets by portfolio weight are Hallstatt Advisors L.P. (2.7%), Maple Rock Capital Partners Inc. (2.6%) and Robotti Robert (2.3%). In their latest 13Fs, 2 managers opened a new position and 3 added to one.
- Members of Congress have disclosed 8 MT trades since 2017, 2 purchases and 1 sale in the past year; the latest was Alan Armstrong (R-OK), buying $1K–15K on Mar 30, 2026.
- MT last closed at $60.12 on Oct 30, 2026.
MT insider trading
No open-market insider purchases or sales of MT were filed in the last 90 days.
Who owns MT? Hedge funds and superinvestors
13 13F filers hold MT among their 50 largest positions, worth $291.0M combined. The biggest bets by portfolio weight are Hallstatt Advisors L.P. (2.7%), Maple Rock Capital Partners Inc. (2.6%) and Robotti Robert (2.3%). In their latest 13Fs, 2 managers opened a new position and 3 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Maple Rock Capital Partners Inc.Hedge fund | 2.6% | $131.9M | 2,190,860 | +54.9% shares | Q2 2026 |
| Castle Hook Partners LPHedge fund | 0.8% | $77.7M | 1,290,147 | New | Q2 2026 |
| Albar Capital Partners LLPHedge fund | 2.1% | $15.8M | 262,470 | +47.6% shares | Q2 2026 |
| Carrhae Capital LLPHedge fund | 1.0% | $14.8M | 222,440 | New | Q3 2026 |
| Robotti RobertInvestment manager | 2.3% | $14.3M | 236,658 | +0.0% shares | Q2 2026 |
| Jb Capital Partners LPHedge fund | 1.9% | $12.3M | 205,000 | +0.0% shares | Q2 2026 |
| Amanah Holdings TrustInvestment manager | 0.6% | $9.9M | 148,000 | +0.0% shares | Q3 2026 |
| Icon Advisers Inc/coMutual fund manager | 0.9% | $4.9M | 81,000 | +24.6% shares | Q2 2026 |
| Hallstatt Advisors L.P.Hedge fund | 2.7% | $3.9M | 63,949 | -8.0% shares | Q2 2026 |
| Hartree Partners, LPHedge fund | 0.4% | $1.9M | 31,576 | — | Q2 2026 |
| Barometer Capital Management Inc.Asset manager | 0.5% | $1.9M | 30,900 | — | Q2 2026 |
| SALT Holding Corp.Investment manager | 0.6% | $1.2M | 19,700 | +0.0% shares | Q2 2026 |
| Oasis Management Co Ltd.Investment manager | 0.1% | $602K | 10,000 | +0.0% shares | Q2 2026 |
Each manager counts with its latest 13F (Q3 2026: 2, Q2 2026: 11). Screen MT in the grand portfolio →
MT stock trades by members of Congress
Members of Congress have disclosed 8 MT trades since 2017, 2 purchases and 1 sale in the past year; the latest was Alan Armstrong (R-OK), buying $1K–15K on Mar 30, 2026.
| Filed | Member | Trade | Amount | Traded | Since |
|---|---|---|---|---|---|
| Jul 21, 2026 | Alan ArmstrongR-OK · Senate | Buy | $1K–15K | Mar 30, 2026 | +24.0% |
| Sep 12, 2025 | Lisa C. McClainR-MI · House | Sale | $1K–15K | Aug 4, 2025 | +98.0% |
| Aug 13, 2025 | Lisa C. McClainR-MI · House | Buy | $1K–15K | Jun 24, 2025 | +94.2% |
| Jan 11, 2019 | Thomas MacArthurR-NJ · House | Sale | $15K–50K | Dec 10, 2018 | +181.1% |
| Dec 6, 2018 | Thomas MacArthurR-NJ · House | Buy | $1K–15K | Oct 17, 2018 | +109.3% |
| Mar 7, 2018 | Thomas MacArthurR-NJ · House | Sale | $15K–50K | Feb 8, 2018 | +87.4% |
| Jun 17, 2017 | Thomas MacArthurR-NJ · House | Buy | $15K–50K | May 12, 2017 | +175.8% |
| Jun 17, 2017 | Thomas MacArthurR-NJ · House | Buy | $15K–50K | May 5, 2017 | +153.2% |
3 members have traded MT: Alan Armstrong, Lisa C. McClain, Thomas MacArthur.
MT questions and answers
Are insiders buying MT stock?
No open-market insider purchases or sales of MT were filed in the last 90 days.
Which hedge funds own MT?
13 13F filers hold MT among their 50 largest positions, worth $291.0M combined. The biggest bets by portfolio weight are Hallstatt Advisors L.P. (2.7%), Maple Rock Capital Partners Inc. (2.6%) and Robotti Robert (2.3%). In their latest 13Fs, 2 managers opened a new position and 3 added to one.
Has Congress traded MT?
Members of Congress have disclosed 8 MT trades since 2017, 2 purchases and 1 sale in the past year; the latest was Alan Armstrong (R-OK), buying $1K–15K on Mar 30, 2026.
Who is the largest holder of MT?
Among 13F filers, Maple Rock Capital Partners Inc. reports the largest MT position, $131.9M (2,190,860 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Hallstatt Advisors L.P.'s: 2.7% of its portfolio.
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Free to use with a link back. The data updates every filing day.