NEWMARKET CORP COM is a security (CUSIP 651587907) tracked across SEC portfolio filings. 3 institutional managers reported $18.7M on Form 13F as of 2026-03-31.
| Manager | Location | Value | Shares |
|---|---|---|---|
| GROUP ONE TRADING, L.P. | CHICAGO, IL | $18.2M | — |
| IMC-Chicago, LLC | CHICAGO, IL | $513K | — |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | BIRMINGHAM, AL | — | — |