Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionWaldron Private Wealth LLC
Latest Disclosed Ownership13,403 shares
Latest Disclosed Value $ 1,612,245
Waldron Private Wealth LLC reports 2.13% decrease in ownership of 6MK / Merck & Co., Inc.

On April 10, 2026 - Waldron Private Wealth LLC filed a 13F-HR form disclosing ownership of 13,403 shares of Merck & Co., Inc. (BG:6MK) valued at $1,612,245 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 14, 2026 disclosing 13,694 shares of Merck & Co., Inc.. This represents a change in shares of -2.13% 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)
2026-04-10 2026-03-31 13F MERCK COM 58933Y105 13,403 -291 -2.13 1,612 11.87 0.0629
2026-01-14 2025-12-31 13F MERCK COM 58933Y105 13,694 -1,013 -6.89 1,441 15.65 0.0570
2025-10-30 2025-09-30 13F MERCK COM 58933Y105 14,707 -165 -1.11 1,246 4.79 0.0505
2025-07-31 2025-06-30 13F MERCK COM 58933Y105 14,872 -739 -4.73 1,189 -15.79 0.0519
2025-05-08 2025-03-31 13F MERCK COM 58933Y105 15,611 -14,926 -48.88 1,413 -53.51 0.0667
2025-01-24 2024-12-31 13F MERCK COM 58933Y105 30,537 -720 -2.30 3,038 -14.43 0.1223
2024-10-21 2024-09-30 13F MERCK COM 58933Y105 31,257 -33 -0.11 3,549 -8.93 0.1474
2024-07-31 2024-06-30 13F MERCK & CO INC COM COM 58933Y105 31,290 -88 -0.28 3,898 -6.39 0.1744
2024-05-09 2024-03-31 13F MERCK & CO INC COM COM 58933Y105 31,378 1,578 5.30 4,164 27.27 0.1879
2024-08-29 2023-12-31 13F/A-1 MERCK & CO INC COM COM 58933Y105 29,800 -8,676 -22.55 3,272 -18.00 0.1556
2024-01-30 2023-12-31 13F MERCK & CO INC COM COM 58933Y105 29,800 -8,676 3 0.1556
2024-08-29 2023-09-30 13F/A-1 MERCK & CO INC COM COM 58933Y105 38,476 -826 -2.10 3,989 -12.58 0.2071
2023-10-26 2023-09-30 13F MERCK & CO INC COM COM 58933Y105 38,476 -826 4 0.2071
2024-08-29 2023-06-30 13F/A-1 MERCK & CO INC COM COM 58933Y105 39,302 -893 -2.22 4,564 5.99 0.2277
2023-08-07 2023-06-30 13F MERCK & CO INC COM COM 58933Y105 39,302 -893 5 0.2277
2024-08-29 2023-03-31 13F/A-1 MERCK & CO INC COM COM 58933Y105 40,195 4,211 11.70 4,306 143,400.00 0.2095
2023-05-02 2023-03-31 13F MERCK & CO INC COM COM 58933Y105 40,195 4,211 4 0.2095
2023-02-08 2022-12-31 13F MERCK & CO INC COM COM 58933Y105 35,984 0 0.00 3 -99.90 0.1942
2022-11-14 2022-09-30 13F MERCK & CO INC COM COM 58933Y105 35,984 999 2.86 3,123 -2.80 0.1941
2022-08-03 2022-06-30 13F MERCK & CO INC COM COM 58933Y105 34,985 1,065 3.14 3,213 14.50 0.1802
2022-05-04 2022-03-31 13F MERCK & CO INC COM COM 58933Y105 33,920 868 2.63 2,806 9.82 0.1439
2022-02-02 2021-12-31 13F MERCK & CO INC COM COM 58933Y105 33,052 1,971 6.34 2,555 8.54 0.1260
2021-11-02 2021-09-30 13F MERCK & CO INC COM COM 58933Y105 31,081 2,283 7.93 2,354 4.25 0.1370
2021-08-06 2021-06-30 13F MERCK & CO INC COM COM 58933Y105 28,798 2,470 9.38 2,258 10.36 0.1443
2021-05-11 2021-03-31 13F MERCK & CO. INC COM COM 58933Y105 26,328 1,026 4.06 2,046 -1.92 0.1422
2021-02-12 2020-12-31 13F MERCK & CO. INC COM COM 58933Y105 25,302 -754 -2.89 2,086 -4.18 0.1552
2020-11-13 2020-09-30 13F MERCK & CO. INC COM COM 58933Y105 26,056 1,299 5.25 2,177 12.86 0.1861
2020-08-11 2020-06-30 13F MERCK & CO. INC COM COM 58933Y105 24,757 349 1.43 1,929 2.23 0.1705
2020-05-05 2020-03-31 13F MERCK & CO. INC COM COM 58933Y105 24,408 9,404 62.68 1,887 37.44 0.2011
2020-02-07 2019-12-31 13F MERCK & CO INC COM COM 58933Y105 15,004 -116 -0.77 1,373 7.18 0.1224
2019-11-06 2019-09-30 13F MERCK & CO INC COM COM 58933Y105 15,120 114 0.76 1,281 1.10 0.1305
2019-07-31 2019-06-30 13F MERCK & CO INC COM COM 58933Y105 15,006 -720 -4.58 1,267 -3.80 0.1348
2019-05-01 2019-03-31 13F MERCK & CO INC COM COM 58933Y105 15,726 2,494 18.85 1,317 30.27 0.1484
2019-02-13 2018-12-31 13F Merck & Co COM 58933Y105 13,232 4,297 48.09 1,011 59.72 0.1457
2018-11-20 2018-09-30 13F Merck & Co COM 58933Y105 8,935 2,984 50.14 633 75.35 0.1233
2018-08-09 2018-06-30 13F Merck & Co COM 58933Y105 5,951 -2,266 -27.58 361 -19.24 0.0783
2018-05-09 2018-03-31 13F Merck & Co COM 58933Y105 8,217 127 1.57 447 -1.76 0.1007
2018-01-26 2017-12-31 13F Merck & Co COM 58933Y105 8,090 150 1.89 455 -10.43 0.1071
2017-11-08 2017-09-30 13F Merck & Co COM 58933Y105 7,940 65 0.83 508 0.79 0.1420
2017-08-14 2017-06-30 13F Merck & Co COM 58933Y105 7,875 -9,373 -54.34 504 -53.63 0.1600
2017-05-18 2017-03-31 13F/A-2 Merck & Co COM 58933Y105 17,248 6,071 54.32 1,087 65.45 0.1748
2017-04-27 2017-03-31 13F/A-1 Merck & Co COM 58933Y105 17,248 0 1,087 0.1624
2017-04-24 2017-03-31 13F Merck & Co COM 58933Y105 17,248 1,087
2017-01-27 2016-12-31 13F Merck & Co COM 58933Y105 11,177 -219 -1.92 657 -7.59 0.2257
2016-11-14 2016-09-30 13F Merck & Co COM 58933Y105 11,396 301 2.71 711 11.27 0.2576
2016-08-11 2016-06-30 13F/A-1 Merck & Co COM 58933Y105 11,095 339 3.15 639 12.30 0.2348
2016-08-09 2016-06-30 13F Merck & Co COM 58933Y105 10,372 512
2016-08-11 2016-03-31 13F/A-2 Merck & Co COM 58933Y105 10,756 1,974 22.48 569 22.89 0.2147
2016-08-09 2016-03-31 13F/A-1 Merck & Co COM 58933Y105 8,782 -1,974 463 0.1726
2016-05-09 2016-03-31 13F Merck & Co COM 58933Y105 10,372 512
2016-02-05 2015-12-31 13F Merck & Co COM 58933Y105 8,782 -1,590 -15.33 463 -9.57 0.1726
2015-11-13 2015-09-30 13F Merck & Co COM 58933Y105 10,372 10,372 512 0.2210
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.