MTX · Insider trading · 13F holders · Congress trades
Minerals Technologies Inc. Common Stock (MTX)
Who is buying and selling MTX: 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
- 4
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 2
MTX at a glance
- No open-market insider purchases or sales of MTX were filed in the last 90 days.
- 4 13F filers hold MTX among their 50 largest positions, worth $15.7M combined. The biggest bets by portfolio weight are Aufman Associates Inc (1.1%), Dean Capital Management (1.0%) and Corbyn Investment Management Inc/md (0.9%).
- Members of Congress have disclosed 8 MTX trades since 2020, 1 purchase and 1 sale in the past year; the latest was Gilbert Ray Cisneros, Jr. (D-CA), buying $1K–15K on Jul 10, 2026.
- MTX last closed at $64.46 on Oct 30, 2026.
MTX insider trading
No open-market insider purchases or sales of MTX were filed in the last 90 days.
Who owns MTX? Hedge funds and superinvestors
4 13F filers hold MTX among their 50 largest positions, worth $15.7M combined. The biggest bets by portfolio weight are Aufman Associates Inc (1.1%), Dean Capital Management (1.0%) and Corbyn Investment Management Inc/md (0.9%).
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| SG Capital Management LLCHedge fund | 0.7% | $8.1M | 109,389 | -41.6% shares | Q2 2026 |
| Dean Capital ManagementInstitutional asset manager | 1.0% | $2.7M | 36,306 | — | Q2 2026 |
| Aufman Associates IncWealth manager | 1.1% | $2.7M | 36,011 | -5.3% shares | Q2 2026 |
| Corbyn Investment Management Inc/mdAsset manager | 0.9% | $2.2M | 30,299 | -0.5% shares | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 4). Screen MTX in the grand portfolio →
MTX stock trades by members of Congress
Members of Congress have disclosed 8 MTX trades since 2020, 1 purchase and 1 sale in the past year; the latest was Gilbert Ray Cisneros, Jr. (D-CA), buying $1K–15K on Jul 10, 2026.
| Filed | Member | Trade | Amount | Traded | Since |
|---|---|---|---|---|---|
| Sep 4, 2026 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $1K–15K | Jul 10, 2026 | -11.0% |
| Feb 13, 2026 | Gilbert Ray Cisneros, Jr.D-CA · House | Sale | $1K–15K | Jan 5, 2026 | +3.9% |
| Jun 6, 2025 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $1K–15K | May 6, 2025 | +23.0% |
| Jul 9, 2024 | Josh GottheimerD-NJ · House | Sale | $1K–15K | Jun 21, 2024 | -23.1% |
| Jan 10, 2022 | Josh GottheimerD-NJ · House | Buy | $1K–15K | Dec 15, 2021 | -10.5% |
| Dec 15, 2020 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $1K–15K | Nov 13, 2020 | +8.3% |
| Oct 14, 2020 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $1K–15K | Sep 29, 2020 | +26.0% |
| Oct 13, 2020 | Josh GottheimerD-NJ · House | Buy | $1K–15K | Sep 24, 2020 | +34.0% |
2 members have traded MTX: Gilbert Ray Cisneros, Jr., Josh Gottheimer.
MTX questions and answers
Are insiders buying MTX stock?
No open-market insider purchases or sales of MTX were filed in the last 90 days.
Which hedge funds own MTX?
4 13F filers hold MTX among their 50 largest positions, worth $15.7M combined. The biggest bets by portfolio weight are Aufman Associates Inc (1.1%), Dean Capital Management (1.0%) and Corbyn Investment Management Inc/md (0.9%).
Has Congress traded MTX?
Members of Congress have disclosed 8 MTX trades since 2020, 1 purchase and 1 sale in the past year; the latest was Gilbert Ray Cisneros, Jr. (D-CA), buying $1K–15K on Jul 10, 2026.
Who is the largest holder of MTX?
Among 13F filers, SG Capital Management LLC reports the largest MTX position, $8.1M (109,389 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Aufman Associates Inc's: 1.1% of its portfolio.
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