NewMarket Corporation
US ˙ NYSE ˙ US6515871076

SecurityNEU / NewMarket Corporation
InstitutionMorgan Stanley
Latest Disclosed Ownership93,471 shares
Latest Disclosed Value $ 59,910,948
Morgan Stanley reports 16.57% increase in ownership of NEU / NewMarket Corporation

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 93,471 shares of NewMarket Corporation (US:NEU) valued at $59,910,237 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 80,182 shares of NewMarket Corporation. This represents a change in shares of 16.57% during the quarter. The current value of the position is $73,854,241 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 93,471 13,289 16.57 59,911 8.72 0.0036
2026-05-27 2025-12-31 13F/A-1 NEWMARKET COM 651587107 80,182 -824 -1.02 55,106 -17.86 0.0033
2026-02-13 2025-12-31 13F NEWMARKET COM 651587107 80,182 -824 55,106 0.0033
2026-05-27 2025-09-30 13F/A-1 NEWMARKET COM 651587107 81,006 10,477 14.85 67,091 37.69 0.0041
2025-11-14 2025-09-30 13F NEWMARKET COM 651587107 81,006 10,477 67,091 0.0041
2025-08-15 2025-06-30 13F NEWMARKET COM 651587107 70,529 20,047 39.71 48,727 70.40 0.0032
2025-05-15 2025-03-31 13F NEWMARKET COM 651587107 50,482 -1,357 -2.62 28,596 4.41 0.0020
2025-05-15 2024-12-31 13F/A-1 NEWMARKET COM 651587107 51,839 -3,734 -6.72 27,390 -10.70 0.0019
2025-02-14 2024-12-31 13F NEWMARKET COM 651587107 51,839 -3,734 27,390 0.0019
2025-05-14 2024-09-30 13F/A-2 NEWMARKET COM 651587107 55,573 4,730 9.30 30,671 17.01 0.0022
2025-02-14 2024-09-30 13F/A-1 NEWMARKET COM 651587107 55,573 4,730 30,671 0.0022
2024-11-14 2024-09-30 13F NEWMARKET COM 651587107 55,573 4,730 30,671 0.0003
2025-05-14 2024-06-30 13F/A-2 NEWMARKET COM 651587107 50,843 12,543 32.75 26,214 7.85 0.0020
2024-10-17 2024-06-30 13F/A-1 NEWMARKET COM 651587107 50,843 12,543 26,214 0.0020
2024-08-14 2024-06-30 13F NEWMARKET COM 651587107 50,843 12,543 26,214 0.0020
2024-10-17 2024-03-31 13F/A-2 NEWMARKET COM 651587107 38,300 5,235 15.83 24,306 34.67 0.0020
2024-08-16 2024-03-31 13F/A-1 NEWMARKET COM 651587107 38,300 5,235 24,306 0.0002
2024-05-15 2024-03-31 13F NEWMARKET COM 651587107 38,300 5,235 24,306 0.0020
2024-08-16 2023-12-31 13F/A-1 NEWMARKET COM 651587107 33,065 3,940 13.53 18,049 36.18 0.0016
2024-02-13 2023-12-31 13F NEWMARKET COM 651587107 33,065 3,940 18,049 0.0016
2023-11-15 2023-09-30 13F NEWMARKET COM 651587107 29,125 -11,088 -27.57 13,253 -18.04 0.0013
2023-08-14 2023-06-30 13F NEWMARKET COM 651587107 40,213 -3,674 -8.37 16,171 0.95 0.0016
2023-05-15 2023-03-31 13F NEWMARKET COM 651587107 43,887 3,663 9.11 16,018 28.00 0.0017
2023-02-14 2022-12-31 13F NEWMARKET COM 651587107 40,224 8,907 28.44 12,514 32.83 0.0014
2022-11-14 2022-09-30 13F NEWMARKET COM 651587107 31,317 6,469 26.03 9,421 25.97 0.0013
2022-10-27 2022-06-30 13F/A-1 NEWMARKET COM 651587107 24,848 13,305 115.26 7,479 99.87 0.0010
2022-08-15 2022-06-30 13F NEWMARKET COM 651587107 24,848 13,305 7,479 0.0010
2022-10-27 2022-03-31 13F/A-1 NEWMARKET COM 651587107 11,543 508 4.60 3,742 -1.03 0.0005
2022-05-13 2022-03-31 13F NEWMARKET COM 651587107 11,543 508 3,742 0.0005
2022-02-14 2021-12-31 13F NEWMARKET COM 651587107 11,035 -1,734 -13.58 3,781 -12.56 0.0005
2021-11-15 2021-09-30 13F NEWMARKET COM 651587107 12,769 -5,317 -29.40 4,324 -25.74 0.0006
2021-08-23 2021-06-30 13F/A-1 NEWMARKET COM 651587107 18,086 11,686 182.59 5,823 139.14 0.0008
2021-08-16 2021-06-30 13F NEWMARKET COM 651587107 18,086 11,686 5,823 0.0002
2021-05-17 2021-03-31 13F NEWMARKET COM 651587107 6,400 -13,790 -68.30 2,435 -69.72 0.0004
2021-02-16 2020-12-31 13F NEWMARKET COM 651587107 20,190 -12,005 -37.29 8,041 -27.04 0.0012
2020-11-13 2020-09-30 13F NEWMARKET COM 651587107 32,195 21,423 198.88 11,021 155.47 0.0021
2020-08-14 2020-06-30 13F NEWMARKET COM 651587107 10,772 -12 -0.11 4,314 4.46 0.0010
2020-05-26 2020-03-31 13F/A-1 NEWMARKET COM 651587107 10,784 -3,278 -23.31 4,130 -39.63 0.0011
2020-05-15 2020-03-31 13F NEWMARKET COM 651587107 10,784 -3,278 4,130 317.2701
2020-02-14 2019-12-31 13F NEWMARKET COM 651587107 14,062 -66,586 -82.56 6,841 -82.03 0.0016
2019-11-14 2019-09-30 13F NEWMARKET COM 651587107 80,648 69,587 629.12 38,073 758.47 0.0101
2019-08-14 2019-06-30 13F NEWMARKET COM 651587107 11,061 -4,755 -30.06 4,435 -35.31 0.0012
2019-05-15 2019-03-31 13F NEWMARKET COM 651587107 15,816 3,802 31.65 6,856 38.51 0.0019
2019-02-14 2018-12-31 13F NEWMARKET COM 651587107 12,014 -6,259 -34.25 4,950 -33.20 0.0015
2019-04-23 2018-09-30 13F/A-2 NEWMARKET COM 651587107 18,273 -1,486 -7.52 7,410 -7.28 0.0019
2018-11-20 2018-09-30 13F/A-1 NEWMARKET COM 651587107 18,273 0 7,410 0.0019
2018-11-14 2018-09-30 13F NEWMARKET COM 651587107 18,273 -1,486 7,410
2019-04-23 2018-06-30 13F/A-1 NEWMARKET COM 651587107 19,759 -7,162 -26.60 7,992 -26.10 0.0022
2018-08-14 2018-06-30 13F NEWMARKET COM 651587107 19,759 -7,162 7,992
2019-04-23 2018-03-31 13F/A-1 NEWMARKET COM 651587107 26,921 1,555 6.13 10,814 7.28 0.0030
2018-05-14 2018-03-31 13F NEWMARKET COM 651587107 26,921 1,555 10,814
2019-04-23 2017-12-31 13F/A-1 NEWMARKET COM 651587107 25,366 -6,553 -20.53 10,080 -25.83 0.0028
2018-02-14 2017-12-31 13F NEWMARKET COM 651587107 25,366 -6,553 10,080
2017-11-14 2017-09-30 13F NEWMARKET COM 651587107 31,919 6,556 25.85 13,590 16.36 0.0041
2017-08-11 2017-06-30 13F NEWMARKET COM 651587107 25,363 -5,094 -16.73 11,679 -15.40 0.0035
2017-05-22 2017-03-31 13F/A-1 NEWMARKET COM 651587107 30,457 3,465 12.84 13,805 20.66 0.0042
2017-05-12 2017-03-31 13F NEWMARKET COM 651587107 30,457 13,805
2017-02-22 2016-12-31 13F/A-1 NEWMARKET COM 651587107 26,992 6,335 30.67 11,441 29.00 0.0037
2017-02-13 2016-12-31 13F NEWMARKET COM 651587107 26,992 11,441
2016-11-10 2016-09-30 13F NEWMARKET COM 651587107 20,657 -3,610 -14.88 8,869 -11.80 0.0030
2016-08-12 2016-06-30 13F NEWMARKET COM 651587107 24,267 4,564 23.16 10,056 28.79 0.0036
2016-05-12 2016-03-31 13F NEWMARKET COM 651587107 19,703 -5,383 -21.46 7,808 -18.26 0.0030
2016-02-09 2015-12-31 13F NEWMARKET COM 651587107 25,086 1,943 8.40 9,552 15.63 0.0035
2016-02-08 2015-09-30 13F/A-1 NEWMARKET COM 651587107 23,143 -11,473 -33.14 8,261 -46.23 0.0031
2015-11-09 2015-09-30 13F NEWMARKET COM 651587107 23,143 8,261
2015-08-12 2015-06-30 13F NEWMARKET COM 651587107 34,616 10,361 42.72 15,365 32.59 0.0053
2015-05-14 2015-03-31 13F NEWMARKET COM 651587107 24,255 -802 -3.20 11,588 14.60 0.0043
2015-02-13 2014-12-31 13F NEWMARKET COM 651587107 25,057 -19,422 -43.67 10,112 -40.34 0.0037
2014-12-16 2014-09-30 13F/A-1 NEWMARKET COM 651587107 44,479 17,953 67.68 16,949 63.51 0.0065
2014-11-14 2014-09-30 13F NEWMARKET COM 651587107 44,479 16,949
2014-05-13 2014-03-31 13F NEWMARKET COM 651587107 26,526 8,287 45.44 10,366 70.10 0.0043
2014-02-13 2013-12-31 13F NEWMARKET COM 651587107 18,239 6,997 62.24 6,094 88.26 0.0026
2013-11-13 2013-09-30 13F NEWMARKET CORP COM ST COM 651587107 11,242 -9,866 -46.74 3,237 -41.59 0.0015
2013-08-08 2013-06-30 13F NEWMARKET CORP COM ST COM 651587107 21,108 21,108 5,542 0.0028
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.