Ecovyst Inc.
US ˙ NYSE ˙ US27923Q1094

SecurityECVT / Ecovyst Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership520,169 shares
Latest Disclosed Value $ 5,061,244
Sei Investments Co reports 183.79% increase in ownership of ECVT / Ecovyst Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 520,169 shares of Ecovyst Inc. (US:ECVT) valued at $5,061,244 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 183,292 shares of Ecovyst Inc.. This represents a change in shares of 183.79% during the quarter. The current value of the position is $6,803,811 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 ECOVYST COM 27923Q109 520,169 336,877 183.79 5,061 215.33 0.0050
2025-11-13 2025-09-30 13F ECOVYST COM 27923Q109 183,292 -235 -0.13 1,606 6.29 0.0017
2025-08-14 2025-06-30 13F ECOVYST COM 27923Q109 183,527 -2,952 -1.58 1,510 30.62 0.0018
2025-05-14 2025-03-31 13F/A-1 ECOVYST COM 27923Q109 186,479 -26,956 -12.63 1,156 -29.08 0.0015
2025-05-13 2025-03-31 13F ECOVYST COM 27923Q109 198,927 -14,508 1,510 0.0016
2025-02-11 2024-12-31 13F ECOVYST COM 27923Q109 213,435 -9,841 -4.41 1,631 6.61 0.0021
2024-11-12 2024-09-30 13F ECOVYST COM 27923Q109 223,276 -595,494 -72.73 1,529 -79.18 0.0020
2024-08-13 2024-06-30 13F ECOVYST COM 27923Q109 818,770 297,594 57.10 7,344 26.38 0.0104
2024-05-07 2024-03-31 13F ECOVYST COM 27923Q109 521,176 191,839 58.25 5,811 80.63 0.0085
2024-02-14 2023-12-31 13F ECOVYST COM 27923Q109 329,337 -43,748 -11.73 3,218 -12.37 0.0052
2023-11-14 2023-09-30 13F ECOVYST COM 27923Q109 373,085 -146,504 -28.20 3,671 -38.34 0.0066
2023-08-11 2023-06-30 13F ECOVYST COM 27923Q109 519,589 78,050 17.68 5,954 22.03 0.0104
2023-05-12 2023-03-31 13F ECOVYST COM 27923Q109 441,539 298,255 208.16 4,879 284.48 0.0091
2023-02-10 2022-12-31 13F ECOVYST COM 27923Q109 143,284 31,035 27.65 1,269 34.00 0.0028
2022-11-14 2022-09-30 13F ECOVYST COM 27923Q109 112,249 43,308 62.82 947 39.47 0.0021
2022-08-15 2022-06-30 13F ECOVYST COM 27923Q109 68,941 32,341 88.36 679 60.52 0.0015
2022-05-13 2022-03-31 13F ECOVYST COM 27923Q109 36,600 -16,600 -31.20 423 -22.39 0.0009
2022-02-14 2021-12-31 13F ECOVYST COM 27923Q109 53,200 13,700 34.68 545 18.22 0.0010
2021-11-12 2021-09-30 13F ECOVYST COM 27923Q109 39,500 22,200 128.32 461 73.31 0.0010
2021-08-06 2021-06-30 13F PQ GROUP HLDGS COM 73943T103 17,300 0 0.00 266 -7.96 0.0006
2021-05-12 2021-03-31 13F PQ GROUP HLDGS COM 73943T103 17,300 0 0.00 289 17.00 0.0007
2021-02-08 2020-12-31 13F PQ GROUP HLDGS COM 73943T103 17,300 -8,900 -33.97 247 -8.18 0.0006
2020-11-06 2020-09-30 13F PQ GROUP HLDGS COM 73943T103 26,200 -4,162 -13.71 269 -33.08 0.0007
2020-08-17 2020-06-30 13F/A-1 PQ GROUP HLDGS COM 73943T103 30,362 -200 -0.65 402 20.36 0.0012
2020-08-11 2020-06-30 13F PQ GROUP HLDGS COM 73943T103 30,362 -200 402 1,090.4464
2020-05-14 2020-03-31 13F PQ GROUP HLDGS COM 73943T103 30,562 30,562 334 0.0012
2019-08-14 2019-06-30 13F PQ GROUP HLDGS COM 73943T103 0 -33,800 -100.00 0 -100.00
2019-05-15 2019-03-31 13F PQ GROUP HLDGS COM 73943T103 33,800 33,800 513 0.0017
2018-11-08 2018-09-30 13F PQ GROUP HLDGS COM 73943T103 0 -23 -100.00 0 0.0000
2018-08-03 2018-06-30 13F PQ GROUP HLDGS COM 73943T103 23 23 0 0.0000
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.