v3.26.1
Related Parties and Parties-In-Interest Transactions
 12 Months Ended
Dec. 31, 2025
EBP 002  
EBP, Related Party and Party-in-Interest Transactions [Line Items]  
Related Parties and Parties-In-Interest Transactions Related Party and Party-In-Interest Transactions
Plan assets available for benefits include cash funds, which are managed by Bank of America, N.A., the trustee of the Plan, and therefore, qualify as party-in-interest transactions. Investments in the NewMarket Corporation Common Stock Fund represent investments in shares of common stock of NewMarket Corporation, the Plan Sponsor. The table below shows the activity in the NewMarket Corporation Common Stock Fund during 2025 and 2024.
 
SharesAmount
Balance—January 1, 2024337,512 $184,224,266 
Purchases19,903 11,843,021 
Distributions and sales(40,257)(23,799,660)
Depreciation(4,697,467)
Balance—December 31, 2024317,158 167,570,160 
Purchases18,140 12,884,266 
Distributions and sales(45,362)(30,151,562)
Appreciation48,958,795 
Balance—December 31, 2025289,936 $199,261,659 
The Plan also issues loans to participants, which are secured by the vested balances in the participant's accounts. These transactions qualify as party-in-interest transactions.