Ecovyst Inc.
US ˙ NYSE ˙ US27923Q1094

SecurityECVT / Ecovyst Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership5,824,450 shares
Ownership 5.00%
Dimensional Fund Advisors Lp ownership in ECVT / Ecovyst Inc.

2024-02-09 - Dimensional Fund Advisors Lp has filed an SC 13G form with the Securities and Exchange Commission (SEC) disclosing ownership of 5,824,450 shares of Ecovyst Inc. (US:ECVT). This represents 5.0 percent ownership of the company.

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)
2024-02-09 2024-02-09 13G 5,824,450 5.00

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 ECOVYST COM 27923Q109 6,498,654 111,376 1.74 83,573 34.47 0.0037
2026-02-12 2025-12-31 13F ECOVYST COM 27923Q109 6,387,278 130,206 2.08 62,149 13.39 0.0130
2025-11-12 2025-09-30 13F ECOVYST COM 27923Q109 6,257,072 77,374 1.25 54,812 7.76 0.0118
2025-08-12 2025-06-30 13F ECOVYST COM 27923Q109 6,179,698 50,855 0.83 50,862 33.85 0.0118
2025-05-13 2025-03-31 13F ECOVYST COM 27923Q109 6,128,843 -67,035 -1.08 38,000 -19.72 0.0094
2025-02-13 2024-12-31 13F ECOVYST COM 27923Q109 6,195,878 -8,043 -0.13 47,336 11.38 0.0114
2024-11-07 2024-09-30 13F ECOVYST COM 27923Q109 6,203,921 -6,934 -0.11 42,497 -23.72 0.0103
2024-08-09 2024-06-30 13F ECOVYST COM 27923Q109 6,210,855 234,824 3.93 55,711 -16.39 0.0146
2024-05-10 2024-03-31 13F ECOVYST COM 27923Q109 5,976,031 151,819 2.61 66,633 17.10 0.0180
2024-02-07 2023-12-31 13F ECOVYST COM 27923Q109 5,824,212 266,615 4.80 56,904 4.05 0.0166
2023-11-09 2023-09-30 13F ECOVYST COM 27923Q109 5,557,597 465,768 9.15 54,688 -6.28 0.0179
2023-08-09 2023-06-30 13F ECOVYST COM 27923Q109 5,091,829 667,569 15.09 58,350 19.36 0.0186
2023-05-12 2023-03-31 13F ECOVYST COM 27923Q109 4,424,260 1,052,590 31.22 48,887 168,472.41 0.0165
2023-02-09 2022-12-31 13F ECOVYST COM 27923Q109 3,371,670 377,035 12.59 30 -99.89 0.0088
2022-11-10 2022-09-30 13F ECOVYST COM 27923Q109 2,994,635 661,240 28.34 25,275 9.97 0.0097
2022-08-12 2022-06-30 13F ECOVYST COM 27923Q109 2,333,395 308,128 15.21 22,984 -1.83 0.0082
2022-05-13 2022-03-31 13F ECOVYST COM 27923Q109 2,025,267 235,938 13.19 23,413 27.78 0.0072
2022-02-09 2021-12-31 13F ECOVYST COM 27923Q109 1,789,329 -38,277 -2.09 18,323 -14.02 0.0055
2021-11-12 2021-09-30 13F ECOVYST COM 27923Q109 1,827,606 1,356 0.07 21,312 -24.02 0.0069
2021-08-12 2021-06-30 13F PQ GROUP HLDGS COM 73943T103 1,826,250 119,637 7.01 28,050 -1.59 0.0089
2021-05-14 2021-03-31 13F PQ GROUP HLDGS COM 73943T103 1,706,613 -6,201 -0.36 28,502 16.69 0.0094
2021-03-08 2020-12-31 13F/A-2 PQ GROUP HLDGS COM 73943T103 1,712,814 48,751 2.93 24,426 43.07 0.0088
2021-02-11 2020-12-31 13F PQ GROUP HLDGS COM 73943T103 1,712,814 48,751 24,426 8,821.3729
2020-11-12 2020-09-30 13F PQ GROUP HLDGS COM 73943T103 1,664,063 167,682 11.21 17,073 -13.82 0.0072
2020-08-13 2020-06-30 13F PQ GROUP HLDGS COM 73943T103 1,496,381 223,602 17.57 19,812 42.82 0.0087
2020-05-14 2020-03-31 13F PQ GROUP HLDGS COM 73943T103 1,272,779 121,441 10.55 13,872 -29.87 0.0072
2020-02-14 2019-12-31 13F PQ GROUP HLDGS COM 73943T103 1,151,338 124,606 12.14 19,780 20.86 0.0072
2019-11-12 2019-09-30 13F PQ GROUP HLDGS COM 73943T103 1,026,732 103,109 11.16 16,366 11.80 0.0064
2019-08-13 2019-06-30 13F PQ GROUP HLDGS COM 73943T103 923,623 122,066 15.23 14,639 20.39 0.0057
2019-08-12 2019-03-31 13F/A-2 PQ GROUP HLDGS COM 73943T103 801,557 144,877 22.06 12,160 25.03 0.0048
2019-05-10 2019-03-31 13F PQ GROUP HLDGS COM 73943T103 801,557 144,877 12,160
2019-02-26 2018-12-31 13F/A-1 PQ GROUP HLDGS COM 73943T103 656,680 259,078 65.16 9,726 40.02 0.0044
2019-02-13 2018-12-31 13F PQ GROUP HLDGS COM 73943T103 656,680 259,078 9,726
2018-11-13 2018-09-30 13F PQ GROUP HLDGS COM 73943T103 397,602 257,133 183.05 6,946 174.76 0.0026
2018-08-10 2018-06-30 13F PQ GROUP HLDGS COM 73943T103 140,469 140,469 2,528 0.0010
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.