Annual report of employee stock purchase, savings and similar plans

Schedule H, Line 4i – Schedule of Assets (Held At End of Year)

v3.26.1
Schedule H, Line 4i – Schedule of Assets (Held At End of Year)
12 Months Ended
Dec. 31, 2025
EBP 003  
EBP, Schedule of Asset Held for Investment [Line Items]  
Schedule H, Line 4i – Schedule of Assets (Held At End of Year)
ECOVYST 401(K) SAVINGS PLAN
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)

EIN 86-2551862, Plan Number 003
December 31, 2025
(a) (b) Identity of issue, borrower, lessor, or similar party (c) Description of investment including maturity date, rate of interest, collateral, par, or maturity value (d) Cost (e) Current
Value
* The Vanguard Group Vanguard Institutional Index Fund Inst'l Shares a $ 33,031,544 
* The Vanguard Group Vanguard PRIMECAP Fund Admiral Shares a 32,067,409 
* The Vanguard Group Vanguard Target Retirement 2030 Fund a 16,827,078 
* The Vanguard Group Vanguard Total Bond Market Index Fund: Inst'l Shr a 15,922,855 
* The Vanguard Group Vanguard Target Retirement 2035 Fund a 15,716,107 
* The Vanguard Group Vanguard Target Retirement 2025 Fund a 15,462,144 
* The Vanguard Group Vanguard Total Stock Market Index Fund: Inst'l Shr a 13,828,623 
* The Vanguard Group Vanguard Target Retirement 2045 Fund a 12,361,330 
* The Vanguard Group Vanguard Target Retirement 2040 Fund a 12,015,248 
* The Vanguard Group Vanguard Total International Stock Index Fund: Inst'l Shr a 11,689,867 
* The Vanguard Group Vanguard Wellington Fund Admiral Shares a 11,121,700 
* The Vanguard Group Vanguard Cash Reserves Federal MM Fund Admiral Shares a 10,745,014 
* The Vanguard Group Vanguard Windsor II Fund Admiral Shares a 10,122,637 
* The Vanguard Group Vanguard Target Retirement 2050 Fund a 9,340,928 
* The Vanguard Group Vanguard U.S. Growth Fund Investor Shares a 8,519,787 
* The Vanguard Group Vanguard Target Retirement 2020 Fund a 7,443,503 
* The Vanguard Group Vanguard Target Retirement 2055 Fund a 6,677,518 
* The Vanguard Group Vanguard Mid-Cap Index Fund Investor Shares a 5,939,888 
* The Vanguard Group Vanguard Target Retirement Income a 5,712,944 
* The Vanguard Group Vanguard Small-Cap Index Fund Investor Shares a 4,703,783 
* The Vanguard Group Vanguard Wellesley Income Fund Investor Shares a 4,669,505 
* The Vanguard Group Vanguard International Growth Fund Investor Shares a 4,178,031 
* The Vanguard Group Vanguard Explorer Fund Investor Shares a 3,592,111 
* The Vanguard Group Vanguard Target Retirement 2060 Fund a 3,292,320 
PIMCO PIMCO Total Return Fund, Administrative Class a 1,755,622 
Fidelity Investments Fidelity Value Fund; Retail Class a 1,582,243 
* The Vanguard Group Vanguard Target Retirement 2065 Fund a 869,934 
* Ecovyst Inc. Ecovyst Stock Fund a 323,303 
* The Vanguard Group Vanguard Target Retirement 2070 Fund a 32,098 
* Notes receivable from participants
Interest rates from 4.25% to 9.50%
3,413,165 
Total $ 282,958,239 
* - Indicates a party-in-interest to the Plan
a - The cost of participant directed investments is not required to be disclosed