NewMarket Corporation
US ˙ NYSE ˙ US6515871076

SecurityNEU / NewMarket Corporation
InstitutionRitholtz Wealth Management
Latest Disclosed Ownership4,363 shares
Latest Disclosed Value $ 2,796,231
Ritholtz Wealth Management reports 42.54% increase in ownership of NEU / NewMarket Corporation

On April 20, 2026 - Ritholtz Wealth Management filed a 13F-HR form disclosing ownership of 4,363 shares of NewMarket Corporation (US:NEU) valued at $2,796,465 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 3,061 shares of NewMarket Corporation. This represents a change in shares of 42.54% during the quarter. The current value of the position is $3,409,597 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)
2026-04-20 2026-03-31 13F NEWMARKET COM 651587107 4,363 1,302 42.54 2,796 32.95 0.0485
2026-01-23 2025-12-31 13F NEWMARKET COM 651587107 3,061 1,167 61.62 2,104 34.12 0.0384
2025-10-28 2025-09-30 13F NEWMARKET COM 651587107 1,894 784 70.63 1,569 104.70 0.0305
2025-07-28 2025-06-30 13F NEWMARKET COM 651587107 1,110 26 2.40 767 24.96 0.0169
2025-04-17 2025-03-31 13F NEWMARKET COM 651587107 1,084 -521 -32.46 614 -27.71 0.0183
2025-01-15 2024-12-31 13F NEWMARKET COM 651587107 1,605 -143 -8.18 848 -12.03 0.0249
2024-10-10 2024-09-30 13F NEWMARKET COM 651587107 1,748 97 5.88 965 13.41 0.0291
2024-08-01 2024-06-30 13F NEWMARKET COM 651587107 1,651 -92 -5.28 851 -23.15 0.0281
2024-04-24 2024-03-31 13F NEWMARKET COM 651587107 1,743 517 42.17 1,106 65.32 0.0382
2024-01-18 2023-12-31 13F NEWMARKET COM 651587107 1,226 773 170.64 669 224.76 0.0260
2023-10-13 2023-09-30 13F NEWMARKET COM 651587107 453 453 206 0.0093
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.