CECO Environmental Corp.
US ˙ NasdaqGS ˙ US1251411013

SecurityCECO / CECO Environmental Corp.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership1,254,667 shares
Ownership 3.60%
Dimensional Fund Advisors Lp ownership in CECO / CECO Environmental Corp.

2025-04-15 - Dimensional Fund Advisors Lp has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 1,254,667 shares of CECO Environmental Corp. (US:CECO). This represents 3.6 percent ownership of the company. In their previous filing dated 2024-10-31 , Dimensional Fund Advisors Lp had reported owning 1,777,502 shares, indicating a decrease of -29.41 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)
2025-04-15 2025-04-15 13G/A 1,777,502 1,254,667 -29.41 3.60 -29.41
2024-10-31 2024-10-31 13G/A 2,326,912 1,777,502 -23.61 5.10 -23.88
2024-02-09 2024-02-09 13G/A 2,358,534 2,326,912 -1.34 6.70 -2.90
2023-02-10 2023-02-10 13G/A 2,261,349 2,358,534 4.30 6.90 9.52
2022-02-08 2022-02-08 13G/A 2,432,470 2,261,349 -7.03 6.30 -8.70
2021-02-12 2021-02-12 13G/A 2,432,371 2,432,470 0.00 6.90 0.00
2020-02-12 2020-02-12 13G/A 2,366,493 2,432,371 2.78 6.90 1.92
2019-02-08 2019-02-08 13G/A 1,943,772 2,366,493 21.75 6.77 20.89
2018-02-09 2018-02-09 13G 1,943,772 5.60

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 CECO ENVIRONMENTAL COM 125141101 903,291 7,751 0.87 53,813 0.40 0.0112
2026-02-12 2025-12-31 13F CECO ENVIRONMENTAL COM 125141101 895,540 -80,842 -8.28 53,598 7.22 0.0112
2025-11-12 2025-09-30 13F CECO ENVIRONMENTAL COM 125141101 976,382 -222,414 -18.55 49,988 47.28 0.0107
2025-08-12 2025-06-30 13F CECO ENVIRONMENTAL COM 125141101 1,198,796 -55,871 -4.45 33,942 18.65 0.0079
2025-05-13 2025-03-31 13F CECO ENVIRONMENTAL COM 125141101 1,254,667 -215,793 -14.68 28,608 -35.65 0.0071
2025-02-13 2024-12-31 13F CECO ENVIRONMENTAL COM 125141101 1,470,460 -307,042 -17.27 44,453 -11.32 0.0107
2024-11-07 2024-09-30 13F CECO ENVIRONMENTAL COM 125141101 1,777,502 -284,814 -13.81 50,128 -15.74 0.0122
2024-08-09 2024-06-30 13F CECO ENVIRONMENTAL COM 125141101 2,062,316 -179,294 -8.00 59,494 15.29 0.0155
2024-05-10 2024-03-31 13F CECO ENVIRONMENTAL COM 125141101 2,241,610 -85,302 -3.67 51,602 9.35 0.0140
2024-02-07 2023-12-31 13F CECO ENVIRONMENTAL COM 125141101 2,326,912 -16,323 -0.70 47,190 26.10 0.0138
2023-11-09 2023-09-30 13F CECO ENVIRONMENTAL COM 125141101 2,343,235 -1,913 -0.08 37,422 19.44 0.0123
2023-08-09 2023-06-30 13F CECO ENVIRONMENTAL COM 125141101 2,345,148 -30,867 -1.30 31,331 -5.75 0.0100
2023-05-12 2023-03-31 13F CECO ENVIRONMENTAL COM 125141101 2,376,015 17,481 0.74 33,240 123,011.11 0.0112
2023-02-09 2022-12-31 13F CECO ENVIRONMENTAL COM 125141101 2,358,534 58,563 2.55 28 -99.87 0.0081
2022-11-10 2022-09-30 13F CECO ENVIRONMENTAL COM 125141101 2,299,971 72,422 3.25 20,355 52.80 0.0078
2022-08-12 2022-06-30 13F CECO ENVIRONMENTAL COM 125141101 2,227,549 -9,879 -0.44 13,321 8.44 0.0048
2022-05-13 2022-03-31 13F CECO ENVIRONMENTAL COM 125141101 2,237,428 -23,921 -1.06 12,284 -12.81 0.0038
2022-02-09 2021-12-31 13F CECO ENVIRONMENTAL COM 125141101 2,261,349 -57,678 -2.49 14,088 -13.71 0.0043
2021-11-12 2021-09-30 13F CECO ENVIRONMENTAL COM 125141101 2,319,027 -72,356 -3.03 16,326 -4.65 0.0053
2021-08-12 2021-06-30 13F CECO ENVIRONMENTAL COM 125141101 2,391,383 7,406 0.31 17,122 -9.43 0.0054
2021-05-14 2021-03-31 13F CECO ENVIRONMENTAL COM 125141101 2,383,977 -48,493 -1.99 18,905 11.67 0.0063
2021-03-08 2020-12-31 13F/A-2 CECO ENVIRONMENTAL COM 125141101 2,432,470 -20,822 -0.85 16,930 -5.33 0.0061
2021-02-11 2020-12-31 13F CECO ENVIRONMENTAL COM 125141101 2,432,470 -20,822 16,930 6,114.2161
2020-11-12 2020-09-30 13F CECO ENVIRONMENTAL COM 125141101 2,453,292 1,623 0.07 17,884 10.70 0.0076
2020-08-13 2020-06-30 13F CECO ENVIRONMENTAL COM 125141101 2,451,669 32,902 1.36 16,156 43.04 0.0071
2020-05-14 2020-03-31 13F CECO ENVIRONMENTAL COM 125141101 2,418,767 -13,604 -0.56 11,295 -39.38 0.0059
2020-02-14 2019-12-31 13F CECO ENVIRONMENTAL COM 125141101 2,432,371 -21,934 -0.89 18,632 8.68 0.0068
2019-11-12 2019-09-30 13F CECO ENVIRONMENTAL COM 125141101 2,454,305 -6,807 -0.28 17,144 -27.36 0.0067
2019-08-13 2019-06-30 13F CECO ENVIRONMENTAL COM 125141101 2,461,112 20,022 0.82 23,601 34.28 0.0092
2019-08-12 2019-03-31 13F/A-2 CECO ENVIRONMENTAL COM 125141101 2,441,090 74,597 3.15 17,576 10.03 0.0070
2019-05-10 2019-03-31 13F CECO ENVIRONMENTAL COM 125141101 2,441,090 74,597 17,576
2019-02-26 2018-12-31 13F/A-1 CECO ENVIRONMENTAL COM 125141101 2,366,493 54,611 2.36 15,974 -12.31 0.0072
2019-02-13 2018-12-31 13F CECO ENVIRONMENTAL COM 125141101 2,366,493 54,611 15,974
2018-11-13 2018-09-30 13F CECO ENVIRONMENTAL COM 125141101 2,311,882 121,444 5.54 18,217 35.45 0.0069
2018-08-10 2018-06-30 13F CECO ENVIRONMENTAL COM 125141101 2,190,438 150,978 7.40 13,449 48.18 0.0054
2018-05-11 2018-03-31 13F CECO ENVIRONMENTAL COM 125141101 2,039,460 95,688 4.92 9,076 -8.99 0.0038
2018-02-12 2017-12-31 13F CECO ENVIRONMENTAL COM 125141101 1,943,772 156,460 8.75 9,972 -34.05 0.0041
2017-11-13 2017-09-30 13F CECO ENVIRONMENTAL COM 125141101 1,787,312 12,217 0.69 15,121 -7.21 0.0066
2017-08-11 2017-06-30 13F CECO ENVIRONMENTAL COM 125141101 1,775,095 126,086 7.65 16,296 -5.97 0.0075
2017-05-12 2017-03-31 13F CECO ENVIRONMENTAL COM 125141101 1,649,009 279,323 20.39 17,331 -9.30 0.0083
2017-02-09 2016-12-31 13F CECO ENVIRONMENTAL COM 125141101 1,369,686 173,487 14.50 19,107 41.61 0.0095
2016-11-10 2016-09-30 13F CECO ENVIRONMENTAL COM 125141101 1,196,199 137,566 12.99 13,493 45.84 0.0073
2016-08-09 2016-06-30 13F CECO ENVIRONMENTAL COM 125141101 1,058,633 41,522 4.08 9,252 46.49 0.0053
2016-05-13 2016-03-31 13F CECO ENVIRONMENTAL COM 125141101 1,017,111 106,600 11.71 6,316 -9.68 0.0038
2016-02-10 2015-12-31 13F CECO ENVIRONMENTAL COM 125141101 910,511 79,823 9.61 6,993 2.78 0.0044
2015-11-13 2015-09-30 13F CECO ENVIRONMENTAL COM 125141101 830,688 91,481 12.38 6,804 -18.76 0.0045
2015-08-14 2015-06-30 13F CECO ENVIRONMENTAL COM 125141101 739,207 28,962 4.08 8,375 11.15 0.0051
2015-05-14 2015-03-31 13F CECO ENVIRONMENTAL COM 125141101 710,245 100 0.01 7,535 -31.72 0.0048
2015-02-06 2014-12-31 13F CECO ENVIRONMENTAL COM 125141101 710,145 2,062 0.29 11,036 16.30 0.0072
2014-11-13 2014-09-30 13F CECO ENVIRONMENTAL COM 125141101 708,083 -2,001 -0.28 9,489 -14.28 0.0067
2014-08-08 2014-06-30 13F CECO ENVIRONMENTAL COM 125141101 710,084 17,897 2.59 11,070 -3.60 0.0077
2014-05-14 2014-03-31 13F CECO ENVIRONMENTAL COM 125141101 692,187 15,921 2.35 11,483 5.01 0.0086
2014-02-12 2013-12-31 13F CECO ENVIRONMENTAL COM 125141101 676,266 6,256 0.93 10,935 15.92 0.0085
2013-11-13 2013-09-30 13F CECO ENVIRONMENTAL COM 125141101 670,010 146,206 27.91 9,433 46.41 0.0082
2013-08-15 2013-06-30 13F CECO ENVIRONMENTAL COM 125141101 523,804 523,804 6,443 0.0061
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.