Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionSantori & Peters, Inc.
Latest Disclosed Ownership2,385 shares
Latest Disclosed Value $ 286,885
Santori & Peters, Inc. reports 1.62% increase in ownership of MRK / Merck & Co., Inc.

On May 7, 2026 - Santori & Peters, Inc. filed a 13F-HR form disclosing ownership of 2,385 shares of Merck & Co., Inc. (MX:MRK) valued at $286,885 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 15, 2026 disclosing 2,347 shares of Merck & Co., Inc.. This represents a change in shares of 1.62% 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)
2026-05-07 2026-03-31 13F MERCK COM 58933Y105 2,385 38 1.62 287 15.79 0.0893
2026-01-15 2025-12-31 13F MERCK COM 58933Y105 2,347 2,347 247 0.0843
2025-07-15 2025-06-30 13F MERCK COM 58933Y105 0 -2,512 -100.00 0 -100.00
2025-04-24 2025-03-31 13F MERCK COM 58933Y105 2,512 -58 -2.26 225 -11.76 0.0909
2025-01-28 2024-12-31 13F MERCK COM 58933Y105 2,570 -320 -11.07 256 -22.26 0.0979
2024-10-23 2024-09-30 13F MERCK COM 58933Y105 2,890 -230 -7.37 328 -15.03 0.1302
2024-07-22 2024-06-30 13F MERCK COM 58933Y105 3,120 -380 -10.86 386 -16.27 0.1650
2024-04-19 2024-03-31 13F MERCK COM 58933Y105 3,500 26 0.75 462 21.96 0.1996
2024-02-05 2023-12-31 13F MERCK COM 58933Y105 3,474 52 1.52 379 7.39 0.1800
2023-11-03 2023-09-30 13F MERCK COM 58933Y105 3,422 -29 -0.84 352 -11.56 0.1893
2023-07-26 2023-06-30 13F MERCK COM 58933Y105 3,451 11 0.32 398 9.04 0.1997
2023-04-19 2023-03-31 13F MERCK COM 58933Y105 3,440 66 1.96 366 -2.41 0.1970
2023-01-26 2022-12-31 13F MERCK COM 58933Y105 3,374 -33 -0.97 374 27.65 0.2194
2022-10-14 2022-09-30 13F MERCK & CO INC COM COM 58933Y105 3,407 -116 -3.29 293 -8.72 0.1970
2022-07-13 2022-06-30 13F MERCK & CO INC COM COM 58933Y105 3,523 275 8.47 321 20.68 0.2073
2022-04-28 2022-03-31 13F MERCK & CO INC COM COM 58933Y105 3,248 3,248 266 0.1503
2021-07-21 2021-06-30 13F MERCK & CO. INC COM COM 58933Y105 0 -2,617 -100.00 0 -100.00
2021-04-28 2021-03-31 13F MERCK & CO. INC COM COM 58933Y105 2,617 -138 -5.01 201 -11.84 0.1197
2021-01-13 2020-12-31 13F MERCK & CO. INC COM COM 58933Y105 2,755 -105 -3.67 228 -3.80 0.1280
2020-11-04 2020-09-30 13F/A-1 MERCK & CO. INC COM COM 58933Y105 2,860 13 0.46 237 7.73 0.1569
2020-07-07 2020-06-30 13F MERCK & CO. INC COM COM 58933Y105 2,847 11 0.39 220 0.92 0.1693
2020-04-27 2020-03-31 13F MERCK & CO. INC COM COM 58933Y105 2,836 11 0.39 218 -14.84 0.1888
2020-01-09 2019-12-31 13F MERCK & CO INC COM COM 58933Y105 2,825 10 0.36 256 8.47 0.1683
2019-10-15 2019-09-30 13F MERCK & CO INC COM COM 58933Y105 2,815 10 0.36 236 0.43 0.1711
2019-07-30 2019-06-30 13F MERCK & CO INC COM COM 58933Y105 2,805 11 0.39 235 1.29 0.1713
2019-04-30 2019-03-31 13F MERCK & CO INC COM COM 58933Y105 2,794 111 4.14 232 13.17 0.1935
2019-02-06 2018-12-31 13F MERCK & CO INC COM COM 58933Y105 2,683 2,683 205 0.1826
2018-04-16 2018-03-31 13F Merck COM 58933Y105 0 -2,005 -100.00 0 -100.00
2018-02-12 2017-12-31 13F Merck COM 58933Y105 2,005 2,005 110 0.0993
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.