Mistras Group, Inc.
US ˙ NYSE ˙ US60649T1079

SecurityMG / Mistras Group, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership1,623,141 shares
Ownership 5.20%
Dimensional Fund Advisors Lp ownership in MG / Mistras Group, Inc.

2025-07-15 - Dimensional Fund Advisors Lp has filed an SCHEDULE 13G form with the Securities and Exchange Commission (SEC) disclosing ownership of 1,623,141 shares of Mistras Group, Inc. (US:MG). This represents 5.2 percent ownership of the company. In their previous filing dated 2021-02-12 , Dimensional Fund Advisors Lp had reported owning 1,135,711 shares, indicating an increase of 42.92 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2025-07-15 2025-07-15 13G 1,135,711 1,623,141 42.92 5.20 33.33
2021-02-12 2021-02-12 13G/A 1,459,112 1,135,711 -22.16 3.90 -22.77
2020-02-12 2020-02-12 13G 1,459,112 5.05

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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)
2026-05-07 2026-03-31 13F MISTRAS GROUP COM 60649T107 1,703,681 35,835 2.15 25,180 19.35 0.0011
2026-02-12 2025-12-31 13F MISTRAS GROUP COM 60649T107 1,667,846 34,519 2.11 21,098 31.27 0.0044
2025-11-12 2025-09-30 13F MISTRAS GROUP COM 60649T107 1,633,327 10,186 0.63 16,072 23.62 0.0034
2025-08-12 2025-06-30 13F MISTRAS GROUP COM 60649T107 1,623,141 88,262 5.75 13,001 -19.93 0.0030
2025-05-13 2025-03-31 13F MISTRAS GROUP COM 60649T107 1,534,879 73,540 5.03 16,239 22.65 0.0040
2025-02-13 2024-12-31 13F MISTRAS GROUP COM 60649T107 1,461,339 102,665 7.56 13,240 -14.29 0.0032
2024-11-07 2024-09-30 13F MISTRAS GROUP COM 60649T107 1,358,674 46,959 3.58 15,448 42.05 0.0037
2024-08-09 2024-06-30 13F MISTRAS GROUP COM 60649T107 1,311,715 44,550 3.52 10,874 -10.24 0.0028
2024-05-10 2024-03-31 13F MISTRAS GROUP COM 60649T107 1,267,165 85,694 7.25 12,114 40.08 0.0033
2024-02-07 2023-12-31 13F MISTRAS GROUP COM 60649T107 1,181,471 -6,881 -0.58 8,648 33.54 0.0025
2023-11-09 2023-09-30 13F MISTRAS GROUP COM 60649T107 1,188,352 -11,924 -0.99 6,477 -30.11 0.0021
2023-08-09 2023-06-30 13F MISTRAS GROUP COM 60649T107 1,200,276 87,789 7.89 9,266 22.86 0.0030
2023-05-12 2023-03-31 13F MISTRAS GROUP COM 60649T107 1,112,487 30,317 2.80 7,542 150,740.00 0.0025
2023-02-09 2022-12-31 13F MISTRAS GROUP COM 60649T107 1,082,170 -15,052 -1.37 5 -99.90 0.0016
2022-11-10 2022-09-30 13F MISTRAS GROUP COM 60649T107 1,097,222 15,905 1.47 4,894 -23.81 0.0019
2022-08-12 2022-06-30 13F MISTRAS GROUP COM 60649T107 1,081,317 84,681 8.50 6,423 -2.49 0.0023
2022-05-13 2022-03-31 13F MISTRAS GROUP COM 60649T107 996,636 36,770 3.83 6,587 -7.64 0.0020
2022-02-09 2021-12-31 13F MISTRAS GROUP COM 60649T107 959,866 -46,100 -4.58 7,132 -30.22 0.0022
2021-11-12 2021-09-30 13F MISTRAS GROUP COM 60649T107 1,005,966 -106,829 -9.60 10,221 -6.56 0.0033
2021-08-12 2021-06-30 13F MISTRAS GROUP COM 60649T107 1,112,795 10,919 0.99 10,939 -12.99 0.0035
2021-05-14 2021-03-31 13F MISTRAS GROUP COM 60649T107 1,101,876 -33,835 -2.98 12,572 42.65 0.0042
2021-03-08 2020-12-31 13F/A-2 MISTRAS GROUP COM 60649T107 1,135,711 -63,600 -5.30 8,813 87.95 0.0032
2021-02-11 2020-12-31 13F MISTRAS GROUP COM 60649T107 1,135,711 -63,600 8,813 3,182.7872
2020-11-12 2020-09-30 13F MISTRAS GROUP COM 60649T107 1,199,311 -193,236 -13.88 4,689 -14.75 0.0020
2020-08-13 2020-06-30 13F MISTRAS GROUP COM 60649T107 1,392,547 -79,197 -5.38 5,500 -12.28 0.0024
2020-05-14 2020-03-31 13F MISTRAS GROUP COM 60649T107 1,471,744 12,632 0.87 6,270 -69.89 0.0033
2020-02-14 2019-12-31 13F MISTRAS GROUP COM 60649T107 1,459,112 -2,895 -0.20 20,821 -13.16 0.0076
2019-11-12 2019-09-30 13F MISTRAS GROUP COM 60649T107 1,462,007 12,737 0.88 23,977 15.13 0.0093
2019-08-13 2019-06-30 13F MISTRAS GROUP COM 60649T107 1,449,270 27,411 1.93 20,826 6.06 0.0081
2019-08-12 2019-03-31 13F/A-2 MISTRAS GROUP COM 60649T107 1,421,859 42,898 3.11 19,636 -0.98 0.0078
2019-05-10 2019-03-31 13F MISTRAS GROUP COM 60649T107 1,421,859 42,898 19,636
2019-02-26 2018-12-31 13F/A-1 MISTRAS GROUP COM 60649T107 1,378,961 59,870 4.54 19,830 -30.63 0.0090
2019-02-13 2018-12-31 13F MISTRAS GROUP COM 60649T107 1,378,961 59,870 19,830
2018-11-13 2018-09-30 13F MISTRAS GROUP COM 60649T107 1,319,091 20,886 1.61 28,584 16.62 0.0109
2018-08-10 2018-06-30 13F MISTRAS GROUP COM 60649T107 1,298,205 53,414 4.29 24,510 3.96 0.0098
2018-05-11 2018-03-31 13F MISTRAS GROUP COM 60649T107 1,244,791 34,325 2.84 23,576 -17.01 0.0098
2018-02-12 2017-12-31 13F MISTRAS GROUP COM 60649T107 1,210,466 42,305 3.62 28,409 18.62 0.0118
2017-11-13 2017-09-30 13F MISTRAS GROUP COM 60649T107 1,168,161 57,126 5.14 23,949 -1.88 0.0105
2017-08-11 2017-06-30 13F MISTRAS GROUP COM 60649T107 1,111,035 69,211 6.64 24,409 9.59 0.0113
2017-05-12 2017-03-31 13F MISTRAS GROUP COM 60649T107 1,041,824 16,755 1.63 22,273 -15.39 0.0106
2017-02-09 2016-12-31 13F MISTRAS GROUP COM 60649T107 1,025,069 10,933 1.08 26,324 10.60 0.0131
2016-11-10 2016-09-30 13F MISTRAS GROUP COM 60649T107 1,014,136 34,004 3.47 23,802 1.74 0.0129
2016-08-09 2016-06-30 13F MISTRAS GROUP COM 60649T107 980,132 61,609 6.71 23,395 2.83 0.0135
2016-05-13 2016-03-31 13F MISTRAS GROUP COM 60649T107 918,523 139,328 17.88 22,752 52.95 0.0136
2016-02-10 2015-12-31 13F MISTRAS GROUP COM 60649T107 779,195 43,647 5.93 14,875 57.37 0.0093
2015-11-13 2015-09-30 13F MISTRAS GROUP COM 60649T107 735,548 26,081 3.68 9,452 -29.81 0.0062
2015-08-14 2015-06-30 13F MISTRAS GROUP COM 60649T107 709,467 65,526 10.18 13,466 8.58 0.0082
2015-05-14 2015-03-31 13F MISTRAS GROUP COM 60649T107 643,941 46,691 7.82 12,402 13.28 0.0078
2015-02-06 2014-12-31 13F MISTRAS GROUP COM 60649T107 597,250 14,478 2.48 10,948 -7.91 0.0072
2014-11-13 2014-09-30 13F MISTRAS GROUP COM 60649T107 582,772 39,261 7.22 11,889 -10.79 0.0084
2014-08-08 2014-06-30 13F MISTRAS GROUP COM 60649T107 543,511 40,579 8.07 13,327 16.38 0.0093
2014-05-14 2014-03-31 13F MISTRAS GROUP COM 60649T107 502,932 51,341 11.37 11,451 21.44 0.0086
2014-02-12 2013-12-31 13F MISTRAS GROUP COM 60649T107 451,591 17,318 3.99 9,429 27.71 0.0073
2013-11-13 2013-09-30 13F MISTRAS GROUP COM 60649T107 434,273 8,701 2.04 7,383 -1.32 0.0064
2013-08-15 2013-06-30 13F MISTRAS GROUP COM 60649T107 425,572 425,572 7,482 0.0070
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.