Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionPettyjohn, Wood & White, Inc
Latest Disclosed Ownership27,595 shares
Latest Disclosed Value $ 3,319,386
Pettyjohn, Wood & White, Inc reports 0.39% decrease in ownership of MRK / Merck & Co., Inc.

On May 15, 2026 - Pettyjohn, Wood & White, Inc filed a 13F-HR form disclosing ownership of 27,595 shares of Merck & Co., Inc. (MX:MRK) valued at $3,319,386 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 27,702 shares of Merck & Co., Inc.. This represents a change in shares of -0.39% 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.

Upgrade to unlock premium data and export to Excel .

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 MERCK COM 58933Y105 27,595 -107 -0.39 3,319 13.86 0.5286
2026-02-11 2025-12-31 13F MERCK COM 58933Y105 27,702 -950 -3.32 2,916 21.26 0.4570
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 28,652 -372 -1.28 2,405 4.66 0.3970
2025-08-12 2025-06-30 13F MERCK COM 58933Y105 29,024 -131 -0.45 2,298 -12.19 0.4104
2025-05-08 2025-03-31 13F MERCK COM 58933Y105 29,155 -5,818 -16.64 2,617 -24.81 0.5016
2025-02-05 2024-12-31 13F MERCK COM 58933Y105 34,973 2,007 6.09 3,479 -7.05 0.6376
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 32,966 -879 -2.60 3,744 -10.65 0.6894
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 33,845 169 0.50 4,190 -5.72 0.8135
2024-05-08 2024-03-31 13F MERCK COM 58933Y105 33,676 -15 -0.04 4,444 21.00 0.8843
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 33,691 -197 -0.58 3,673 5.28 0.7954
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 33,888 314 0.94 3,489 -9.96 0.8235
2023-08-10 2023-06-30 13F MERCK COM 58933Y105 33,574 215 0.64 3,874 9.16 0.8915
2023-04-25 2023-03-31 13F MERCK COM 58933Y105 33,359 -25 -0.07 3,549 118,200.00 0.8675
2023-02-02 2022-12-31 13F MERCK COM 58933Y105 33,384 -150 -0.45 4 -99.90 0.9233
2022-10-28 2022-09-30 13F MERCK COM 58933Y105 33,534 -39 -0.12 2,888 -5.65 0.7703
2022-08-08 2022-06-30 13F/A-1 MERCK COM 58933Y105 33,573 10,631 46.34 3,061 62.65 0.7243
2022-08-08 2022-06-30 13F MERCK COM 58933Y105 33,573 10,631 3,061 0.7243
2022-04-22 2022-03-31 13F MERCK COM 58933Y105 22,942 -66 -0.29 1,882 6.75 0.4021
2022-02-04 2021-12-31 13F MERCK COM 58933Y105 23,008 12 0.05 1,763 2.08 0.3634
2021-11-08 2021-09-30 13F MERCK COM 58933Y105 22,996 -35 -0.15 1,727 -3.57 0.3835
2021-08-03 2021-06-30 13F MERCK COM 58933Y105 23,031 -3,104 -11.88 1,791 -11.12 0.4012
2021-05-10 2021-03-31 13F MERCK & CO. COM 58933Y105 26,135 -256 -0.97 2,015 -6.67 0.4779
2021-02-04 2020-12-31 13F MERCK & CO. COM 58933Y105 26,391 251 0.96 2,159 -0.42 0.5513
2020-10-26 2020-09-30 13F MERCK & CO. COM 58933Y105 26,140 -411 -1.55 2,168 5.60 0.6338
2020-08-04 2020-06-30 13F MERCK & CO. COM 58933Y105 26,551 -20 -0.08 2,053 0.44 0.6561
2020-04-20 2020-03-31 13F MERCK COM 58933Y105 26,571 1,596 6.39 2,044 -10.00 0.7624
2020-02-11 2019-12-31 13F MERCK COM 58933Y105 24,975 -1,177 -4.50 2,271 3.18 0.6533
2019-11-04 2019-09-30 13F MERCK COM 58933Y105 26,152 -2,410 -8.44 2,201 -8.10 0.6688
2019-08-02 2019-06-30 13F MERCK COM 58933Y105 28,562 159 0.56 2,395 1.40 0.7418
2019-04-26 2019-03-31 13F MERCK COM 58933Y105 28,403 -11,380 -28.61 2,362 -22.30 0.7690
2019-02-08 2018-12-31 13F MERCK COM 58933Y105 39,783 84 0.21 3,040 7.95 1.1140
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 39,699 -1,200 -2.93 2,816 13.41 0.9164
2018-08-13 2018-06-30 13F MERCK COM 58933Y105 40,899 -375 -0.91 2,483 10.45 0.8674
2018-05-11 2018-03-31 13F MERCK COM 58933Y105 41,274 745 1.84 2,248 -1.45 0.8137
2018-02-12 2017-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 40,529 4,347 12.01 2,281 -1.55 0.8199
2017-11-13 2017-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 36,182 -1,560 -4.13 2,317 -4.22 0.8592
2017-08-11 2017-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 37,742 982 2.67 2,419 3.55 0.8968
2017-05-05 2017-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 36,760 -479 -1.29 2,336 6.57 0.8677
2017-02-07 2016-12-31 13F/A-1 MERCK & CO INC NEW COM COM 58933Y105 37,239 -651 -1.72 2,192 -7.32 0.8510
2017-02-02 2016-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 37,239 2,192
2016-11-02 2016-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 37,890 -1,705 -4.31 2,365 3.68 1.1256
2016-08-11 2016-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 39,595 -203 -0.51 2,281 8.31 0.9007
2016-05-12 2016-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 39,798 998 2.57 2,106 2.78 0.8594
2016-02-08 2015-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 38,800 -7,775 -16.69 2,049 -10.91 0.8694
2015-11-06 2015-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 46,575 9,300 24.95 2,300 8.39 1.0563
2015-08-17 2015-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 37,275 -250 -0.67 2,122 -1.62 0.8937
2015-05-15 2015-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 37,525 14,020 59.65 2,157 61.57 0.8940
2015-02-11 2014-12-31 13F MERCK & CO INC NEW COM COM 58933Y105 23,505 0 0.00 1,335 -4.16 0.5523
2014-11-12 2014-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 23,505 -705 -2.91 1,393 -0.57 0.6021
2014-08-12 2014-06-30 13F MERCK & CO INC NEW COM COM 58933Y105 24,210 -670 -2.69 1,401 -0.78 0.6127
2014-04-23 2014-03-31 13F MERCK & CO INC NEW COM COM 58933Y105 24,880 24,880 1,412 0.6459
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.