Minerals Technologies Inc.
US ˙ NYSE ˙ US6031581068

SecurityMTX / Minerals Technologies Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership28,622 shares
Latest Disclosed Value $ 1,744,506
Sei Investments Co reports 20.68% increase in ownership of MTX / Minerals Technologies Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 28,622 shares of Minerals Technologies Inc. (US:MTX) valued at $1,744,511 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 23,718 shares of Minerals Technologies Inc.. This represents a change in shares of 20.68% during the quarter. The current value of the position is $2,147,795 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-02-13 2025-12-31 13F MINERALS TECHNOLOGIES COM 603158106 28,622 4,904 20.68 1,745 18.40 0.0017
2025-11-13 2025-09-30 13F MINERALS TECHNOLOGIES COM 603158106 23,718 601 2.60 1,473 15.71 0.0016
2025-08-14 2025-06-30 13F MINERALS TECHNOLOGIES COM 603158106 23,117 -114,732 -83.23 1,273 -85.47 0.0015
2025-05-14 2025-03-31 13F/A-1 MINERALS TECHNOLOGIES COM 603158106 137,849 -11,838 -7.91 8,763 -23.18 0.0113
2025-05-13 2025-03-31 13F MINERALS TECHNOLOGIES COM 603158106 136,983 -12,704 10,439 0.0114
2025-02-11 2024-12-31 13F MINERALS TECHNOLOGIES COM 603158106 149,687 19,952 15.38 11,408 13.85 0.0146
2024-11-12 2024-09-30 13F MINERALS TECHNOLOGIES COM 603158106 129,735 -8,041 -5.84 10,019 -12.55 0.0130
2024-08-13 2024-06-30 13F MINERALS TECHNOLOGIES COM 603158106 137,776 -22,584 -14.08 11,457 -5.09 0.0162
2024-05-07 2024-03-31 13F MINERALS TECHNOLOGIES COM 603158106 160,360 5,841 3.78 12,072 9.56 0.0177
2024-02-14 2023-12-31 13F MINERALS TECHNOLOGIES COM 603158106 154,519 -3,570 -2.26 11,019 27.29 0.0177
2023-11-14 2023-09-30 13F MINERALS TECHNOLOGIES COM 603158106 158,089 12,249 8.40 8,657 2.89 0.0156
2023-08-11 2023-06-30 13F MINERALS TECHNOLOGIES COM 603158106 145,840 21,110 16.92 8,414 11.64 0.0147
2023-05-12 2023-03-31 13F MINERALS TECHNOLOGIES COM 603158106 124,730 -9,572 -7.13 7,536 -7.58 0.0140
2023-02-10 2022-12-31 13F MINERALS TECHNOLOGIES COM 603158106 134,302 2,943 2.24 8,155 25.64 0.0181
2022-11-14 2022-09-30 13F MINERALS TECHNOLOGIES COM 603158106 131,359 6,104 4.87 6,490 -15.53 0.0145
2022-08-15 2022-06-30 13F MINERALS TECHNOLOGIES COM 603158106 125,255 10,466 9.12 7,683 1.19 0.0166
2022-05-13 2022-03-31 13F MINERALS TECHNOLOGIES COM 603158106 114,789 24,149 26.64 7,593 14.52 0.0153
2022-02-14 2021-12-31 13F MINERALS TECHNOLOGIES COM 603158106 90,640 22,301 32.63 6,630 38.91 0.0124
2021-11-12 2021-09-30 13F MINERALS TECHNOLOGIES COM 603158106 68,339 12,102 21.52 4,773 7.89 0.0100
2021-08-06 2021-06-30 13F MINERALS TECHNOLOGIES COM 603158106 56,237 16,013 39.81 4,424 46.01 0.0098
2021-05-12 2021-03-31 13F MINERALS TECHNOLOGIES COM 603158106 40,224 8,874 28.31 3,030 55.62 0.0076
2021-02-08 2020-12-31 13F MINERALS TECHNOLOGIES COM 603158106 31,350 -6,601 -17.39 1,947 0.41 0.0050
2020-12-04 2020-09-30 13F/A-1 MINERALS TECHNOLOGIES COM 603158106 37,951 6,618 21.12 1,939 31.90 0.0056
2020-11-06 2020-09-30 13F MINERALS TECHNOLOGIES COM 603158106 37,951 6,618 1,939 4,668.6809
2020-08-17 2020-06-30 13F/A-1 MINERALS TECHNOLOGIES COM 603158106 31,333 -1,915 -5.76 1,470 21.89 0.0046
2020-08-11 2020-06-30 13F MINERALS TECHNOLOGIES COM 603158106 37,716 4,468 2,174 5,897.0907
2020-05-14 2020-03-31 13F MINERALS TECHNOLOGIES COM 603158106 33,248 -4,468 -11.85 1,206 -44.53 0.0044
2020-02-06 2019-12-31 13F MINERALS TECHNOLOGIES COM 603158106 37,716 2,713 7.75 2,174 17.01 0.0065
2019-11-12 2019-09-30 13F MINERALS TECHNOLOGIES COM 603158106 35,003 -12 -0.03 1,858 -0.85 0.0048
2019-08-14 2019-06-30 13F MINERALS TECHNOLOGIES COM 603158106 35,015 1,592 4.76 1,874 -4.63 0.0061
2019-05-15 2019-03-31 13F MINERALS TECHNOLOGIES COM 603158106 33,423 4,927 17.29 1,965 2.02 0.0066
2019-02-13 2018-12-31 13F MINERALS TECHNOLOGIES COM 603158106 28,496 0 0.00 1,926 0.00 0.0069
2018-11-08 2018-09-30 13F MINERALS TECHNOLOGIES COM 603158106 28,496 2,964 11.61 1,926 0.10 0.0070
2018-08-03 2018-06-30 13F MINERALS TECHNOLOGIES COM 603158106 25,532 -3,237 -11.25 1,924 -0.10 0.0065
2018-05-11 2018-03-31 13F MINERALS TECHNOLOGIES COM 603158106 28,769 3,235 12.67 1,926 9.56 0.0074
2018-02-08 2017-12-31 13F MINERALS TECHNOLOGIES COM 603158106 25,534 -4,007 -13.56 1,758 -15.76 0.0061
2017-11-06 2017-09-30 13F MINERALS TECHNOLOGIES COM 603158106 29,541 -12,599 -29.90 2,087 -32.35 0.0074
2017-07-31 2017-06-30 13F MINERALS TECHNOLOGIES COM 603158106 42,140 1,754 4.34 3,085 -0.29 0.0123
2017-05-05 2017-03-31 13F MINERALS TECHNOLOGIES COM 603158106 40,386 2,745 7.29 3,094 6.40 0.0136
2017-02-02 2016-12-31 13F MINERALS TECHNOLOGIES COM 603158106 37,641 22,672 151.46 2,908 174.86 0.0141
2016-11-04 2016-09-30 13F MINERALS TECHNOLOGIES COM 603158106 14,969 2,809 23.10 1,058 53.33 0.0054
2016-08-11 2016-06-30 13F MINERALS TECHNOLOGIES COM 603158106 12,160 761 6.68 690 6.48 0.0041
2016-05-10 2016-03-31 13F/A-1 MINERALS TECHNOLOGIES COM 603158106 11,399 -90 -0.78 648 22.96 0.0040
2016-02-03 2015-12-31 13F MINERALS TECHNOLOGIES COM 603158106 11,489 1,814 18.75 527 13.09 0.0032
2015-11-02 2015-09-30 13F/A-1 MINERALS TECHNOLOGIES COM 603158106 9,675 5,391 125.84 466 60.14 0.0043
2015-10-30 2015-09-30 13F MINERALS TECHNOLOGIES COM 603158106 9,675 468
2015-08-07 2015-06-30 13F/A-1 MINERALS TECHNOLOGIES COM 603158106 4,284 -1,356 -24.04 291 -29.02 0.0026
2015-08-04 2015-06-30 13F MINERALS TECHNOLOGIES COM 603158106 4,284 -1,356 291 0.0026
2015-05-14 2015-03-31 13F/A-1 MINERALS TECHNOLOGIES COM 603158106 5,640 1,054 22.98 410 28.93 0.0036
2015-05-01 2015-03-31 13F MINCO GOLD COM 603158106 5,640 410
2015-02-10 2014-12-31 13F MINERALS TECHNOLOGIES COM 603158106 4,586 4,586 318 0.0028
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.