NewMarket Corporation
US ˙ NYSE ˙ US6515871076

SecurityNEU / NewMarket Corporation
InstitutionState Street Corp
Latest Disclosed Ownership233,643 shares
Latest Disclosed Value $ 150,426,345
State Street Corp reports 1.16% increase in ownership of NEU / NewMarket Corporation

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 233,643 shares of NewMarket Corporation (US:NEU) valued at $149,753,481 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 230,958 shares of NewMarket Corporation. This represents a change in shares of 1.16% during the quarter. The current value of the position is $185,652,728 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)
2026-05-15 2026-03-31 13F NEWMARKET COM 651587107 233,643 2,685 1.16 150,426 -5.63 0.0052
2026-02-13 2025-12-31 13F NEWMARKET COM 651587107 230,958 -4,764 -2.02 159,396 -18.62 0.0053
2025-11-14 2025-09-30 13F NEWMARKET COM 651587107 235,722 -3,263 -1.37 195,861 18.14 0.0068
2025-08-14 2025-06-30 13F NEWMARKET COM 651587107 238,985 -5,902 -2.41 165,784 18.95 0.0062
2025-05-15 2025-03-31 13F NEWMARKET COM 651587107 244,887 1,473 0.61 139,378 7.88 0.0057
2025-02-14 2024-12-31 13F NEWMARKET COM 651587107 243,414 14,042 6.12 129,200 1.63 0.0051
2024-11-14 2024-09-30 13F NEWMARKET COM 651587107 229,372 8,979 4.07 127,132 11.35 0.0052
2024-08-14 2024-06-30 13F NEWMARKET COM 651587107 220,393 -1,966 -0.88 114,171 -19.40 0.0050
2024-05-15 2024-03-31 13F NEWMARKET COM 651587107 222,359 4,988 2.29 141,647 18.92 0.0063
2024-02-14 2023-12-31 13F NEWMARKET COM 651587107 217,371 11,094 5.38 119,110 26.30 0.0058
2023-11-14 2023-09-30 13F NEWMARKET COM 651587107 206,277 14,837 7.75 94,309 21.80 0.0052
2023-08-14 2023-06-30 13F NEWMARKET COM 651587107 191,440 -7,800 -3.91 77,429 5.86 0.0041
2023-05-15 2023-03-31 13F NEWMARKET COM 651587107 199,240 606 0.31 73,143 17.56 0.0041
2023-05-15 2022-12-31 13F/A-99 NEWMARKET COM 651587107 198,634 3,645 1.87 62,217 5.32 0.0037
2023-05-15 2022-12-31 13F NEWMARKET COM 651587107 198,634 3,645 62,217 0.0037
2022-11-15 2022-09-30 13F NEWMARKET COM 651587107 194,989 1,197 0.62 59,074 0.57 0.0037
2022-08-15 2022-06-30 13F NEWMARKET COM 651587107 193,792 -10,333 -5.06 58,737 -11.86 0.0035
2022-05-16 2022-03-31 13F NEWMARKET COM 651587107 204,125 5,847 2.95 66,638 -2.52 0.0033
2022-02-14 2021-12-31 13F NEWMARKET COM 651587107 198,278 2,211 1.13 68,364 2.28 0.0032
2021-11-15 2021-09-30 13F NEWMARKET COM 651587107 196,067 -7,906 -3.88 66,841 1.18 0.0035
2021-08-16 2021-06-30 13F NEWMARKET COM 651587107 203,973 18,538 10.00 66,061 -6.74 0.0035
2021-07-09 2021-03-31 13F/A-1 NEWMARKET COM 651587107 185,435 2,850 1.56 70,838 -3.05 0.0041
2021-05-17 2021-03-31 13F NEWMARKET COM 651587107 185,435 2,850 70,838 0.0041
2021-02-16 2020-12-31 13F NEWMARKET COM 651587107 182,585 1,944 1.08 73,065 17.51 0.0045
2020-11-10 2020-09-30 13F NEWMARKET COM 651587107 180,641 -5,443 -2.93 62,180 -16.96 0.0042
2020-08-14 2020-06-30 13F NEWMARKET COM 651587107 186,084 -6,422 -3.34 74,883 1.11 0.0054
2020-06-19 2020-03-31 13F/A-1 NEWMARKET COM 651587107 192,506 4,664 2.48 74,064 -19.28 0.0065
2020-05-11 2020-03-31 13F NEWMARKET COM 651587107 192,506 4,664 74,064 6,504.3105
2020-02-06 2019-12-31 13F NEWMARKET COM 651587107 187,842 1,764 0.95 91,750 3.99 0.0063
2019-11-14 2019-09-30 13F NEWMARKET COM 651587107 186,078 -22,065 -10.60 88,232 5.26 0.0066
2019-08-14 2019-06-30 13F NEWMARKET COM 651587107 208,143 -12,841 -5.81 83,826 -12.86 0.0063
2019-05-15 2019-03-31 13F NEWMARKET COM 651587107 220,984 5,856 2.72 96,196 8.06 0.0075
2019-02-12 2018-12-31 13F NEWMARKET COM 651587107 215,128 -10,883 -4.82 89,018 -2.87 0.0081
2018-11-09 2018-09-30 13F NEWMARKET Common equity shares 651587107 226,011 1,542 0.69 91,652 0.94 0.0070
2018-08-14 2018-06-30 13F NEWMARKET Common equity shares 651587107 224,469 -6,725 -2.91 90,794 -2.24 0.0076
2018-05-15 2018-03-31 13F NEWMARKET Common equity shares 651587107 231,194 -8,090 -3.38 92,872 -2.33 0.0079
2018-02-14 2017-12-31 13F NEWMARKET Common equity shares 651587107 239,284 2,678 1.13 95,085 -5.61 0.0076
2017-11-14 2017-09-30 13F NEWMARKET Common equity shares 651587107 236,606 824 0.35 100,736 -7.21 0.0087
2017-08-14 2017-06-30 13F NEWMARKET Common equity shares 651587107 235,782 7,795 3.42 108,568 5.07 0.0096
2017-05-15 2017-03-31 13F NEWMARKET Common equity shares 651587107 227,987 5,710 2.57 103,327 9.68 0.0092
2017-02-09 2016-12-31 13F NEWMARKET Common equity shares 651587107 222,277 -11,294 -4.84 94,205 -6.06 0.0089
2017-01-13 2016-09-30 13F/A-1 NEWMARKET Common equity shares 651587107 233,571 -20,880 -8.21 100,283 -4.89 0.0101
2016-11-14 2016-09-30 13F NEWMARKET Common equity shares 651587107 233,571 100,283
2016-08-12 2016-06-30 13F NEWMARKET Common equity shares 651587107 254,451 -4,659 -1.80 105,440 2.69 0.0113
2016-05-20 2016-03-31 13F/A-1 NEWMARKET Common equity shares 651587107 259,110 1,398 0.54 102,677 4.65 0.0111
2016-05-12 2016-03-31 13F NEWMARKET Common equity shares 651587107 259,110 102,677
2016-02-16 2015-12-31 13F NEWMARKET Common equity shares 651587107 257,712 6,866 2.74 98,116 9.56 0.0107
2015-11-16 2015-09-30 13F NEWMARKET Common equity shares 651587107 250,846 10,583 4.40 89,553 -16.03 0.0104
2015-08-13 2015-06-30 13F NEWMARKET Common equity shares 651587107 240,263 -16,645 -6.48 106,652 -13.12 0.0114
2015-05-15 2015-03-31 13F NEWMARKET Common equity shares 651587107 256,908 6,948 2.78 122,751 21.70 0.0126
2015-02-11 2014-12-31 13F NEWMARKET Common equity shares 651587107 249,960 -6,938 -2.70 100,865 3.05 0.0100
2014-11-12 2014-09-30 13F/A-1 NEWMARKET Common equity shares 651587107 256,898 -33,759 -11.61 97,883 -14.12 0.0105
2014-11-10 2014-09-30 13F NEWMARKET Common equity shares 651587107 256,898 97,883
2014-08-12 2014-06-30 13F NEWMARKET Common equity shares 651587107 290,657 -4,342 -1.47 113,971 -1.13 0.0123
2014-05-15 2014-03-31 13F/A-1 NEWMARKET Common equity shares 651587107 294,999 -5,525 -1.84 115,278 14.80 0.0131
2014-05-13 2014-03-31 13F NEWMARKET Common equity shares 651587107 295,104 115,319
2014-02-06 2013-12-31 13F/A-1 NEWMARKET Common equity shares 651587107 300,524 -7,092 -2.31 100,418 13.39 0.0112
2014-02-06 2013-12-31 13F NEWMARKET Common equity shares 651587107 290,974 76,294
2013-11-12 2013-09-30 13F NEWMARKET Common equity shares 651587107 307,616 8,441 2.82 88,561 12.74 0.0109
2013-08-08 2013-06-30 13F NEWMARKET Common equity shares 651587107 299,175 299,175 78,550 0.0102
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.