Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionOak Associates Ltd /oh/
Latest Disclosed Ownership16,835 shares
Latest Disclosed Value $ 2,025,082
Oak Associates Ltd /oh/ ownership in MRK / Merck & Co., Inc.

On May 14, 2026 - Oak Associates Ltd /oh/ filed a 13F-HR form disclosing ownership of 16,835 shares of Merck & Co., Inc. (MX:MRK) valued at $2,025,082 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 16,835 shares of Merck & Co., Inc.. This represents a change in shares of 0.00% during the quarter.

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)
2026-05-14 2026-03-31 13F Merck COM 58933Y105 16,835 0 0.00 2,025 14.28 0.1363
2026-02-12 2025-12-31 13F Merck COM 58933Y105 16,835 -333 -1.94 1,772 177,100.00 0.1065
2025-11-12 2025-09-30 13F Merck COM 58933Y105 17,168 0 0.00 1 -99.93 0.0880
2025-08-12 2025-06-30 13F Merck COM 58933Y105 17,168 0 0.00 1,359 -11.81 0.0888
2025-05-14 2025-03-31 13F Merck COM 58933Y105 17,168 0 0.00 1,541 -9.72 0.1156
2025-02-13 2024-12-31 13F Merck COM 58933Y105 17,168 0 0.00 1,708 -12.42 0.1178
2024-11-12 2024-09-30 13F Merck COM 58933Y105 17,168 0 0.00 1,950 -8.28 0.1311
2024-08-08 2024-06-30 13F Merck COM 58933Y105 17,168 0 0.00 2,125 -6.18 0.1410
2024-05-10 2024-03-31 13F Merck COM 58933Y105 17,168 -2,431 -12.40 2,265 6.04 0.1570
2024-02-14 2023-12-31 13F Merck COM 58933Y105 19,599 4,541 30.16 2,137 37.81 0.1616
2023-11-13 2023-09-30 13F Merck COM 58933Y105 15,058 -8,092 -34.95 1,550 -41.97 0.1290
2023-08-11 2023-06-30 13F Merck COM 58933Y105 23,150 -15 -0.06 2,671 8.40 0.2136
2023-05-11 2023-03-31 13F Merck COM 58933Y105 23,165 -585 -2.46 2,465 -6.49 0.2027
2023-02-09 2022-12-31 13F Merck COM 58933Y105 23,750 0 0.00 2,635 28.85 0.2211
2022-11-09 2022-09-30 13F Merck COM 58933Y105 23,750 0 0.00 2,045 -5.54 0.1735
2022-08-12 2022-06-30 13F Merck COM 58933Y105 23,750 -15 -0.06 2,165 11.03 0.1693
2022-05-12 2022-03-31 13F Merck COM 58933Y105 23,765 0 0.00 1,950 7.08 0.1190
2022-02-10 2021-12-31 13F Merck COM 58933Y105 23,765 0 0.00 1,821 2.02 0.0970
2021-11-12 2021-09-30 13F Merck COM 58933Y105 23,765 0 0.00 1,785 -3.41 0.1016
2021-08-09 2021-06-30 13F Merck COM 58933Y105 23,765 0 0.00 1,848 0.87 0.1046
2021-05-13 2021-03-31 13F Merck COM 58933Y105 23,765 25 0.11 1,832 -5.66 0.1084
2021-02-12 2020-12-31 13F Merck COM 58933Y105 23,740 0 0.00 1,942 -1.37 0.1174
2020-11-13 2020-09-30 13F Merck COM 58933Y105 23,740 0 0.00 1,969 7.24 0.1316
2020-08-11 2020-06-30 13F Merck COM 58933Y105 23,740 -1,530 -6.05 1,836 -5.56 0.1233
2020-05-15 2020-03-31 13F Merck COM 58933Y105 25,270 -550 -2.13 1,944 -17.21 0.1594
2020-02-13 2019-12-31 13F Merck COM 58933Y105 25,820 0 0.00 2,348 8.00 0.1383
2019-11-12 2019-09-30 13F Merck COM 58933Y105 25,820 0 0.00 2,174 0.42 0.1341
2019-08-09 2019-06-30 13F Merck COM 58933Y105 25,820 1,575 6.50 2,165 7.39 0.1350
2019-05-09 2019-03-31 13F Merck COM 58933Y105 24,245 24,245 2,016 0.1232
2018-02-08 2017-12-31 13F Merck COM 58933Y105 0 -38,000 -100.00 0 -100.00
2017-11-07 2017-09-30 13F Merck COM 58933Y105 38,000 -2,400 -5.94 2,433 -6.03 0.1792
2017-08-18 2017-06-30 13F Merck COM 58933Y105 40,400 -8,600 -17.55 2,589 -16.83 0.1950
2017-05-16 2017-03-31 13F Merck COM 58933Y105 49,000 -2,300 -4.48 3,113 3.08 0.2487
2017-02-08 2016-12-31 13F Merck COM 58933Y105 51,300 -4,500 -8.06 3,020 -7.84 0.2980
2016-11-09 2016-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 55,800 0 0.00 3,277 1.93 0.3377
2016-08-09 2016-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 55,800 0 0.00 3,215 8.91 0.3860
2016-05-19 2016-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 55,800 700 1.27 2,952 1.44 0.3614
2016-02-08 2015-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 55,100 2,900 5.56 2,910 12.88 0.3467
2015-11-16 2015-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 52,200 0 0.00 2,578 -13.26 0.3417
2015-08-11 2015-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 52,200 500 0.97 2,972 0.00 0.3618
2015-05-11 2015-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 51,700 0 0.00 2,972 1.23 0.3575
2015-02-09 2014-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 51,700 3,500 7.26 2,936 2.77 0.3512
2014-12-16 2014-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 48,200 0 0.00 2,857 2.47 0.3521
2014-08-26 2014-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 48,200 3,100 6.87 2,788 8.91 0.3406
2014-06-03 2014-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 45,100 2,100 4.88 2,560 18.96 0.3167
2014-03-04 2013-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 43,000 0 0.00 2,152 7.76 0.2328
2013-08-13 2013-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 43,000 43,000 1,997 0.2378
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.