NewMarket Corporation
US ˙ NYSE ˙ US6515871076

SecurityNEU / NewMarket Corporation
InstitutionFmr Llc
Latest Disclosed Ownership1,367 shares
Latest Disclosed Value $ 876,247
Fmr Llc reports 18.68% decrease in ownership of NEU / NewMarket Corporation

On May 15, 2026 - Fmr Llc filed a 13F-HR form disclosing ownership of 1,367 shares of NewMarket Corporation (US:NEU) valued at $876,179 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,681 shares of NewMarket Corporation. This represents a change in shares of -18.68% during the quarter. The current value of the position is $1,086,218 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 1,367 -314 -18.68 876 -24.16 0.0000
2026-02-17 2025-12-31 13F NEWMARKET COM 651587107 1,681 -315 -15.78 1,156 -30.13 0.0001
2025-11-13 2025-09-30 13F NEWMARKET COM 651587107 1,996 697 53.66 1,654 84.28 0.0001
2025-08-14 2025-06-30 13F NEWMARKET COM 651587107 1,299 262 25.27 898 52.81 0.0001
2025-05-12 2025-03-31 13F NEWMARKET COM 651587107 1,037 222 27.24 588 36.51 0.0000
2025-02-13 2024-12-31 13F NEWMARKET COM 651587107 815 140 20.74 431 15.59 0.0000
2024-11-13 2024-09-30 13F NEWMARKET COM 651587107 675 230 51.69 372 62.45 0.0000
2024-08-13 2024-06-30 13F NEWMARKET COM 651587107 445 -202 -31.22 229 -44.15 0.0000
2024-05-13 2024-03-31 13F NEWMARKET COM 651587107 647 58 9.85 411 27.73 0.0000
2024-02-13 2023-12-31 13F NEWMARKET COM 651587107 589 37 6.70 321 27.89 0.0000
2023-11-13 2023-09-30 13F NEWMARKET COM 651587107 552 16 2.99 251 16.74 0.0000
2023-08-11 2023-06-30 13F NEWMARKET COM 651587107 536 -1,117 -67.57 215 -64.34 0.0000
2023-08-11 2023-03-31 13F/A-1 NEWMARKET COM 651587107 1,653 -2,445 -59.66 603 -52.71 0.0001
2023-05-11 2023-03-31 13F NEWMARKET COM 651587107 1,653 -2,445 603 0.0000
2023-02-13 2022-12-31 13F NEWMARKET COM 651587107 4,098 -2,355 -36.49 1,275 -34.35 0.0001
2022-11-10 2022-09-30 13F NEWMARKET COM 651587107 6,453 -2,985 -31.63 1,942 -31.64 0.0002
2022-08-12 2022-06-30 13F NEWMARKET COM 651587107 9,438 -6,341 -40.19 2,841 -44.50 0.0003
2022-05-13 2022-03-31 13F NEWMARKET COM 651587107 15,779 15,494 5,436.49 5,119 5,123.47 0.0004
2022-02-14 2021-12-31 13F NEWMARKET COM 651587107 285 -36,869 -99.23 98 -99.22 0.0000
2022-02-14 2021-09-30 13F/A-1 NEWMARKET COM 651587107 37,154 -9,891 -21.02 12,587 -16.91 0.0010
2021-11-15 2021-09-30 13F NEWMARKET COM 651587107 37,154 -9,891 12,587 0.0002
2021-08-13 2021-06-30 13F NEWMARKET COM 651587107 47,045 1,387 3.04 15,148 -12.73 0.0012
2021-05-14 2021-03-31 13F NEWMARKET COM 651587107 45,658 7 0.02 17,357 -4.54 0.0015
2021-02-08 2020-12-31 13F NEWMARKET COM 651587107 45,651 -807 -1.74 18,182 14.32 0.0016
2020-11-13 2020-09-30 13F NEWMARKET COM 651587107 46,458 -206 -0.44 15,904 -14.90 0.0016
2020-08-24 2020-06-30 13F/A-1 NEWMARKET COM 651587107 46,664 2,610 5.92 18,688 10.80 0.0021
2020-08-13 2020-06-30 13F NEWMARKET COM 651587107 46,664 2,610 18,688 459.1095
2020-05-14 2020-03-31 13F NEWMARKET COM 651587107 44,054 -32,125 -42.17 16,867 -54.49 0.0023
2020-02-07 2019-12-31 13F NEWMARKET COM 651587107 76,179 42,476 126.03 37,063 132.94 0.0041
2019-11-13 2019-09-30 13F NEWMARKET COM 651587107 33,703 33,365 9,871.30 15,911 11,685.93 0.0019
2019-08-13 2019-06-30 13F NEWMARKET COM 651587107 338 -14 -3.98 135 -11.18 0.0000
2019-05-13 2019-03-31 13F NEWMARKET COM 651587107 352 -25,818 -98.65 152 -98.59 0.0000
2019-02-13 2018-12-31 13F NEWMARKET COM 651587107 26,170 2,661 11.32 10,784 13.12 0.0015
2018-11-09 2018-09-30 13F NEWMARKET COM 651587107 23,509 23,509 9,533 0.0011
2018-05-14 2018-03-31 13F NEWMARKET COM 651587107 0 -936 -100.00 0 -100.00
2018-02-12 2017-12-31 13F NEWMARKET COM 651587107 936 236 33.71 372 17.35 0.0000
2017-05-11 2017-03-31 13F NEWMARKET COM 651587107 700 700 317 0.0000
2017-02-10 2016-12-31 13F NEWMARKET COM 651587107 0 0 0 0.0000
2016-11-14 2016-09-30 13F NEWMARKET COM 651587107 0 -70,656 -100.00 0 -100.00
2016-08-11 2016-06-30 13F NEWMARKET COM 651587107 70,656 -5,100 -6.73 29,278 -2.47 0.0040
2016-05-16 2016-03-31 13F NEWMARKET COM 651587107 75,756 -13,200 -14.84 30,019 -11.36 0.0042
2016-02-12 2015-12-31 13F NEWMARKET COM 651587107 88,956 -3,797 -4.09 33,868 2.28 0.0046
2015-11-10 2015-09-30 13F NEWMARKET COM 651587107 92,753 7,500 8.80 33,113 -12.50 0.0047
2015-08-25 2015-06-30 13F/A-1 NEWMARKET COM 651587107 85,253 -97,821 -53.43 37,843 -56.74 0.0048
2015-08-13 2015-06-30 13F NEWMARKET COM 651587107 85,253 37,843
2015-05-14 2015-03-31 13F NEWMARKET COM 651587107 183,074 45,627 33.20 87,473 57.71 0.0111
2015-02-17 2014-12-31 13F NEWMARKET COM 651587107 137,447 33,506 32.24 55,464 40.05 0.0072
2014-11-14 2014-09-30 13F NEWMARKET COM 651587107 103,941 -22,127 -17.55 39,603 -19.89 0.0054
2014-08-14 2014-06-30 13F NEWMARKET COM 651587107 126,068 17,168 15.76 49,433 16.16 0.0066
2014-05-15 2014-03-31 13F NEWMARKET COM 651587107 108,900 18,200 20.07 42,556 40.42 0.0059
2014-02-13 2013-12-31 13F NEWMARKET COM 651587107 90,700 36,600 67.65 30,307 94.57 0.0043
2013-11-14 2013-09-30 13F NEWMARKET COM 651587107 54,100 20,203 59.60 15,576 75.01 0.0024
2013-09-24 2013-06-30 13F/A-1 NEWMARKET COM 651587107 33,897 33,897 8,900 0.0015
2013-08-14 2013-06-30 13F NEWMARKET COM 651587107 33,897 8,900 0.0015
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.