Ecovyst Inc.
US ˙ NYSE ˙ US27923Q1094

SecurityECVT / Ecovyst Inc.
InstitutionD. E. Shaw & Co., Inc.
ManagerDE Shaw
Latest Disclosed Ownership422,463 shares
Latest Disclosed Value $ 5,432,874
D. E. Shaw & Co., Inc. reports 1,365.56% increase in ownership of ECVT / Ecovyst Inc.

On May 15, 2026 - D. E. Shaw & Co., Inc. filed a 13F-HR form disclosing ownership of 422,463 shares of Ecovyst Inc. (US:ECVT) valued at $5,432,874 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 28,826 shares of Ecovyst Inc.. This represents a change in shares of 1,365.56% during the quarter. The current value of the position is $5,525,816 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)
2026-05-15 2026-03-31 13F ECOVYST COM 27923Q109 422,463 393,637 1,365.56 5,433 1,840.00 0.0033
2026-02-17 2025-12-31 13F ECOVYST COM 27923Q109 28,826 -533,305 -94.87 280 -94.31 0.0002
2025-11-14 2025-09-30 13F ECOVYST COM 27923Q109 562,131 562,131 4,924 0.0028
2023-11-14 2023-09-30 13F ECOVYST COM 27923Q109 0 -60,491 -100.00 0 -100.00
2023-08-14 2023-06-30 13F ECOVYST COM 27923Q109 60,491 -192,644 -76.10 693 -75.22 0.0007
2023-05-15 2023-03-31 13F ECOVYST COM 27923Q109 253,135 16,623 7.03 2,797 33.51 0.0030
2023-02-14 2022-12-31 13F ECOVYST COM 27923Q109 236,512 -108,126 -31.37 2,095 -27.98 0.0023
2022-11-14 2022-09-30 13F ECOVYST COM 27923Q109 344,638 259,530 304.94 2,909 247.14 0.0035
2022-08-15 2022-06-30 13F ECOVYST COM 27923Q109 85,108 85,108 838 0.0010
2022-05-16 2022-03-31 13F ECOVYST COM 27923Q109 0 -10,287 -100.00 0 -100.00
2022-02-14 2021-12-31 13F ECOVYST COM 27923Q109 10,287 10,287 105 0.0001
2021-11-15 2021-09-30 13F PQ GROUP HLDGS COM 73943T103 0 -114,447 -100.00 0 -100.00
2021-08-16 2021-06-30 13F PQ GROUP HLDGS COM 73943T103 114,447 104,172 1,013.84 1,758 922.09 0.0015
2021-05-17 2021-03-31 13F PQ GROUP HLDGS COM 73943T103 10,275 -72,714 -87.62 172 -85.46 0.0002
2021-02-16 2020-12-31 13F PQ GROUP HLDGS COM 73943T103 82,989 -170,567 -67.27 1,183 -54.53 0.0011
2020-11-16 2020-09-30 13F PQ GROUP HLDGS COM 73943T103 253,556 182,631 257.50 2,602 176.81 0.0027
2020-08-14 2020-06-30 13F PQ GROUP HLDGS COM 73943T103 70,925 42,281 147.61 940 201.28 0.0011
2020-05-15 2020-03-31 13F PQ GROUP HLDGS COM 73943T103 28,644 28,644 312 0.0005
2018-08-14 2018-06-30 13F PQ GROUP HLDGS COM 73943T103 0 -13,730 -100.00 0 -100.00
2018-05-15 2018-03-31 13F PQ GROUP HLDGS COM 73943T103 13,730 -532 -3.73 192 -18.30 0.0003
2018-02-14 2017-12-31 13F PQ GROUP HLDGS COM 73943T103 14,262 14,262 235 0.0003
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.