Ecovyst Inc.
US ˙ NYSE ˙ US27923Q1094

SecurityECVT / Ecovyst Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership18,699 shares
Latest Disclosed Value $ 240,470
Citigroup Inc reports 48.44% increase in ownership of ECVT / Ecovyst Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 18,699 shares of Ecovyst Inc. (US:ECVT) valued at $240,469 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 12,597 shares of Ecovyst Inc.. This represents a change in shares of 48.44% during the quarter. The current value of the position is $244,583 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)
2026-05-11 2026-03-31 13F ECOVYST COM 27923Q109 18,699 6,102 48.44 240 96.72 0.0001
2026-02-13 2025-12-31 13F ECOVYST COM 27923Q109 12,597 -7,976 -38.77 123 -32.22 0.0001
2025-11-10 2025-09-30 13F ECOVYST COM 27923Q109 20,573 -34,043 -62.33 180 -59.91 0.0001
2025-08-11 2025-06-30 13F ECOVYST COM 27923Q109 54,616 -47,005 -46.26 449 -28.73 0.0002
2025-05-12 2025-03-31 13F ECOVYST COM 27923Q109 101,621 -7,458 -6.84 630 -24.37 0.0003
2025-02-12 2024-12-31 13F ECOVYST COM 27923Q109 109,079 13,362 13.96 833 27.18 0.0005
2024-11-12 2024-09-30 13F ECOVYST COM 27923Q109 95,717 56,121 141.73 656 84.51 0.0004
2024-08-12 2024-06-30 13F ECOVYST COM 27923Q109 39,596 10,157 34.50 355 8.23 0.0002
2024-05-10 2024-03-31 13F ECOVYST COM 27923Q109 29,439 -16,094 -35.35 328 -26.13 0.0002
2024-02-09 2023-12-31 13F ECOVYST COM 27923Q109 45,533 16,723 58.05 445 56.89 0.0003
2023-12-06 2023-09-30 13F/A-1 ECOVYST COM 27923Q109 28,810 -19,781 -40.71 283 -49.10 0.0002
2023-11-09 2023-09-30 13F ECOVYST COM 27923Q109 28,810 -19,781 283 0.0001
2023-08-10 2023-06-30 13F ECOVYST COM 27923Q109 48,591 14,197 41.28 557 46.32 0.0004
2023-05-11 2023-03-31 13F ECOVYST COM 27923Q109 34,394 8,776 34.26 380 68.14 0.0003
2023-02-09 2022-12-31 13F ECOVYST COM 27923Q109 25,618 7,437 40.91 227 46.75 0.0002
2022-11-10 2022-09-30 13F ECOVYST COM 27923Q109 18,181 375 2.11 154 -12.50 0.0001
2022-08-10 2022-06-30 13F ECOVYST COM 27923Q109 17,806 3,041 20.60 176 2.92 0.0001
2022-05-12 2022-03-31 13F ECOVYST COM 27923Q109 14,765 -10,942 -42.56 171 -35.23 0.0001
2022-02-10 2021-12-31 13F ECOVYST COM 27923Q109 25,707 13,645 113.12 264 87.23 0.0001
2021-11-10 2021-09-30 13F ECOVYST COM 27923Q109 12,062 5,468 82.92 141 38.24 0.0001
2021-08-10 2021-06-30 13F PQ GROUP HLDGS COM 73943T103 6,594 -148 -2.20 102 -9.73 0.0001
2021-05-13 2021-03-31 13F PQ GROUP HLDGS COM 73943T103 6,742 -7,582 -52.93 113 -44.61 0.0001
2021-02-11 2020-12-31 13F PQ GROUP HLDGS COM 73943T103 14,324 8,512 146.46 204 240.00 0.0001
2020-11-12 2020-09-30 13F PQ GROUP HLDGS COM 73943T103 5,812 -9,911 -63.04 60 -71.29 0.0000
2020-08-12 2020-06-30 13F PQ GROUP HLDGS COM 73943T103 15,723 1,850 13.34 209 38.41 0.0002
2020-05-12 2020-03-31 13F PQ GROUP HLDGS COM 73943T103 13,873 3,784 37.51 151 -13.22 0.0001
2020-02-12 2019-12-31 13F PQ GROUP HLDGS COM 73943T103 10,089 3,076 43.86 174 55.36 0.0001
2019-11-08 2019-09-30 13F PQ GROUP HLDGS COM 73943T103 7,013 -4,705 -40.15 112 -39.46 0.0001
2019-08-12 2019-06-30 13F PQ GROUP HLDGS COM 73943T103 11,718 608 5.47 185 10.12 0.0001
2019-05-13 2019-03-31 13F PQ GROUP HLDGS COM 73943T103 11,110 -1,143 -9.33 168 -7.18 0.0002
2019-02-12 2018-12-31 13F PQ GROUP HLDGS COM 73943T103 12,253 -3,733 -23.35 181 -35.13 0.0002
2018-11-13 2018-09-30 13F PQ GROUP HLDGS COM 73943T103 15,986 6,420 67.11 279 62.21 0.0002
2018-08-10 2018-06-30 13F PQ GROUP HLDGS COM 73943T103 9,566 2,767 40.70 172 81.05 0.0002
2018-05-11 2018-03-31 13F PQ GROUP HLDGS COM 73943T103 6,799 762 12.62 95 -4.04 0.0001
2018-02-12 2017-12-31 13F PQ GROUP HLDGS COM 73943T103 6,037 6,037 99 0.0001
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.