Matrix Service Company
US ˙ NasdaqGS ˙ US5768531056

SecurityMTRX / Matrix Service Company
InstitutionBoston Partners
Latest Disclosed Ownership52,707 shares
Latest Disclosed Value $ 605,080
Boston Partners reports 0.38% increase in ownership of MTRX / Matrix Service Company

On May 11, 2026 - Boston Partners filed a 13F-HR form disclosing ownership of 52,707 shares of Matrix Service Company (US:MTRX) valued at $605,076 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 52,505 shares of Matrix Service Company. This represents a change in shares of 0.38% during the quarter. The current value of the position is $727,884 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-11 2026-03-31 13F MATRIX SVC COM 576853105 52,707 202 0.38 605 -1.47 0.0003
2026-02-13 2025-12-31 13F MATRIX SVC COM 576853105 52,505 -2,110 -3.86 614 -14.01 0.0006
2025-11-13 2025-09-30 13F MATRIX SVC COM 576853105 54,615 -790,351 -93.54 714 -93.75 0.0007
2025-08-12 2025-06-30 13F/A-1 MATRIX SVC COM 576853105 844,966 352,194 71.47 11,417 86.44 0.0127
2025-08-07 2025-06-30 13F MATRIX SVC COM 576853105 598,081 105,309 8,082 0.0037
2025-05-13 2025-03-31 13F MATRIX SVC COM 576853105 492,772 437,222 787.08 6,123 822.14 0.0074
2025-02-11 2024-12-31 13F MATRIX SVC COM 576853105 55,550 -19,851 -26.33 665 -23.59 0.0008
2024-11-12 2024-09-30 13F MATRIX SVC COM 576853105 75,401 2,694 3.71 869 20.53 0.0010
2024-08-14 2024-06-30 13F MATRIX SVC COM 576853105 72,707 49,858 218.21 722 142.76 0.0009
2024-05-28 2024-03-31 13F/A-1 MATRIX SVC COM 576853105 22,849 -7,345 -24.33 298 0.68 0.0004
2024-05-13 2024-03-31 13F MATRIX SVC COM 576853105 22,849 -7,345 298 0.0001
2024-02-07 2023-12-31 13F MATRIX SVC COM 576853105 30,194 -437,850 -93.55 295 -94.66 0.0004
2023-11-08 2023-09-30 13F MATRIX SVC COM 576853105 468,044 15,324 3.38 5,523 107.13 0.0076
2023-08-10 2023-06-30 13F MATRIX SVC COM 576853105 452,720 6,647 1.49 2,667 10.71 0.0036
2023-05-09 2023-03-31 13F MATRIX SVC COM 576853105 446,073 -45,727 -9.30 2,409 -21.26 0.0033
2023-02-08 2022-12-31 13F MATRIX SVC COM 576853105 491,800 118,162 31.62 3,059 97.67 0.0041
2022-11-09 2022-09-30 13F MATRIX SVC COM 576853105 373,638 -25,884 -6.48 1,547 -23.45 0.0023
2022-08-10 2022-06-30 13F MATRIX SVC COM 576853105 399,522 -10,137 -2.47 2,021 -39.98 0.0028
2022-05-10 2022-03-31 13F MATRIX SVC COM 576853105 409,659 -45,986 -10.09 3,367 -1.75 0.0041
2022-02-04 2021-12-31 13F MATRIX SVC COM 576853105 455,645 301,714 196.01 3,427 112.86 0.0041
2021-11-05 2021-09-30 13F MATRIX SVC COM 576853105 153,931 -14,352 -8.53 1,610 -8.89 0.0020
2021-08-12 2021-06-30 13F MATRIX SVC COM 576853105 168,283 -72,051 -29.98 1,767 -43.90 0.0023
2021-05-10 2021-03-31 13F MATRIX SVC COM 576853105 240,334 -26,175 -9.82 3,150 7.25 0.0042
2021-02-10 2020-12-31 13F/A-1 MATRIX SVC COM 576853105 266,509 20,939 8.53 2,937 43.20 0.0046
2021-02-04 2020-12-31 13F MATRIX SVC COM 576853105 266,509 20,939 2,937 1,762.0254
2020-11-13 2020-09-30 13F/A-1 MATRIX SVC COM 576853105 245,570 66,423 37.08 2,051 17.81 0.0037
2020-11-09 2020-09-30 13F MATRIX SVC COM 576853105 179,147 0 1,741 1,278.1014
2020-08-12 2020-06-30 13F MATRIX SVC COM 576853105 179,147 -22,899 -11.33 1,741 -8.99 0.0032
2020-05-13 2020-03-31 13F MATRIX SVC COM 576853105 202,046 80,233 65.87 1,913 -31.36 0.0038
2020-02-06 2019-12-31 13F/A-1 MATRIX SVC COM 576853105 121,813 -18,319 -13.07 2,787 16.08 0.0037
2020-02-05 2019-12-31 13F MATRIX SVC COM 576853105 121,813 -18,319 2,787 1,566.9328
2019-11-20 2019-09-30 13F/A-1 MATRIX SVC COM 576853105 140,132 -435,187 -75.64 2,401 -79.40 0.0033
2019-11-08 2019-09-30 13F MATRIX SVC COM 576853105 575,319 0 11,656 0.0154
2019-08-26 2019-06-30 13F/A-1 MATRIX SVC COM 576853105 575,319 81,004 16.39 11,656 20.43 0.0153
2019-08-09 2019-06-30 13F MATRIX SVC COM 576853105 575,319 81,004 11,656
2019-05-13 2019-03-31 13F/A-1 MATRIX SVC COM 576853105 494,315 494,315 9,679 0.0128
2019-05-03 2019-03-31 13F MATRIX SVC COM 576853105 494,315 494,315 9,679
2019-02-07 2018-12-31 13F MATRIX SVC COM 576853105 0 -263,950 -100.00 0 -100.00
2018-11-14 2018-09-30 13F MATRIX SVC COM 576853105 263,950 -29,028 -9.91 6,506 21.00 0.0076
2018-08-03 2018-06-30 13F MATRIX SVC COM 576853105 292,978 -71,992 -19.73 5,377 7.54 0.0064
2018-05-04 2018-03-31 13F MATRIX SVC COM 576853105 364,970 -53,233 -12.73 5,000 -32.83 0.0060
2018-02-14 2017-12-31 13F/A-1 MATRIX SVC COM 576853105 418,203 -87,140 -17.24 7,444 -3.09 0.0088
2018-02-01 2017-12-31 13F MATRIX SVC COM 576853105 418,203 -87,140 7,444
2017-11-02 2017-09-30 13F MATRIX SVC COM 576853105 505,343 -235,167 -31.76 7,681 10.95 0.0095
2017-08-02 2017-06-30 13F MATRIX SVC COM 576853105 740,510 179,480 31.99 6,923 -25.21 0.0088
2017-05-03 2017-03-31 13F MATRIX SVC COM 576853105 561,030 182,130 48.07 9,257 7.63 0.0118
2017-02-06 2016-12-31 13F MATRIX SVC COM 576853105 378,900 -75,200 -16.56 8,601 0.96 0.0113
2016-11-09 2016-09-30 13F MATRIX SVC COM 576853105 454,100 -71,390 -13.59 8,519 -1.70 0.0119
2016-08-05 2016-06-30 13F MATRIX SVC COM 576853105 525,490 190,440 56.84 8,666 46.11 0.0125
2016-05-12 2016-03-31 13F MATRIX SVC COM 576853105 335,050 6,825 2.08 5,931 -12.03 0.0087
2016-02-08 2015-12-31 13F MATRIX SVC COM 576853105 328,225 -2,975 -0.90 6,742 -9.41 0.0097
2015-11-10 2015-09-30 13F MATRIX SVC COM 576853105 331,200 -1,820 -0.55 7,442 22.26 0.0113
2015-08-10 2015-06-30 13F MATRIX SVC COM 576853105 333,020 333,020 6,087 0.0087
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.