Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionHeritage Wealth Advisors
Latest Disclosed Ownership49,619 shares
Latest Disclosed Value $ 5,968,645
Heritage Wealth Advisors reports 91.87% decrease in ownership of 6MK / Merck & Co., Inc.

On May 13, 2026 - Heritage Wealth Advisors filed a 13F-HR form disclosing ownership of 49,619 shares of Merck & Co., Inc. (BG:6MK) valued at $5,968,645 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 610,573 shares of Merck & Co., Inc.. This represents a change in shares of -91.87% 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)
2026-05-13 2026-03-31 13F Merck COM 58933Y105 49,619 -560,954 -91.87 5,969 -90.71 0.2332
2026-02-13 2025-12-31 13F Merck COM 58933Y105 610,573 -3,524 -0.57 64,258 24.67 2.4540
2025-11-13 2025-09-30 13F Merck COM 58933Y105 614,097 24,697 4.19 51,541 10.47 2.2558
2025-08-11 2025-06-30 13F Merck COM 58933Y105 589,400 23,906 4.23 46,657 -8.08 2.2157
2025-05-08 2025-03-31 13F Merck COM 58933Y105 565,494 30,524 5.71 50,759 -4.62 2.5713
2025-02-12 2024-12-31 13F Merck COM 58933Y105 534,970 40,230 8.13 53,219 -5.28 2.6388
2024-11-12 2024-09-30 13F Merck COM 58933Y105 494,740 16,022 3.35 56,183 -5.20 2.6357
2024-12-12 2024-06-30 13F/A-1 Merck COM 58933Y105 478,718 12,293 2.64 59,265 -3.70 2.6756
2024-08-06 2024-06-30 13F Merck COM 58933Y105 478,718 12,293 59,265 2.6756
2024-12-12 2024-03-31 13F/A-1 Merck COM 58933Y105 466,425 8,073 1.76 61,545 23.16 2.8087
2024-05-08 2024-03-31 13F Merck COM 58933Y105 465,337 6,985 61,401 2.8115
2024-12-12 2023-12-31 13F/A-1 Merck COM 58933Y105 458,352 -29,037 -5.96 49,970 -0.41 2.4847
2024-02-12 2023-12-31 13F Merck COM 58933Y105 457,374 -30,015 49,863 2.4844
2024-12-12 2023-09-30 13F/A-1 Merck COM 58933Y105 487,389 6,922 1.44 50,177 -9.50 2.7364
2023-11-09 2023-09-30 13F Merck COM 58933Y105 487,389 6,922 50,177 2.7364
2024-12-12 2023-06-30 13F/A-1 Merck COM 58933Y105 480,467 3,446 0.72 55,441 9.24 2.9340
2023-08-09 2023-06-30 13F Merck COM 58933Y105 480,467 3,446 55,441 2.9340
2023-05-04 2023-03-31 13F Merck COM 58933Y105 477,021 18,949 4.14 50,750 -0.14 2.8271
2024-12-12 2022-12-31 13F/A-1 Merck COM 58933Y105 458,072 7,649 1.70 50,823 31.02 2.9433
2023-02-07 2022-12-31 13F Merck COM 58933Y105 458,072 7,649 50,823 2.9433
2024-12-12 2022-09-30 13F/A-1 Merck COM 58933Y105 450,423 28,796 6.83 38,790 101,978.95 2.8139
2022-11-10 2022-09-30 13F Merck COM 58933Y105 450,423 28,796 39 2.8139
2022-08-04 2022-06-30 13F Merck COM 58933Y105 421,627 82,314 24.26 38 40.74 2.6718
2022-05-11 2022-03-31 13F Merck COM 58933Y105 339,313 42,067 14.15 28 22.73 1.5406
2022-03-28 2021-12-31 13F/A-1 Merck COM 58933Y105 297,246 23,053 8.41 23 -99.89 1.2510
2022-02-02 2021-12-31 13F Merck COM 58933Y105 297,246 23,053 22,781 1.2510
2021-11-02 2021-09-30 13F Merck COM 58933Y105 274,193 15,650 6.05 20,595 2.43 1.2614
2021-08-09 2021-06-30 13F/A-1 Merck COM 58933Y105 258,543 33,616 14.95 20,107 15.96 1.2382
2021-07-27 2021-06-30 13F Merck COM 58933Y105 162,526 -62,401 13,295 0.8309
2021-04-27 2021-03-31 13F Merck COM 58933Y105 224,927 62,401 38.39 17,340 30.42 1.0453
2021-02-01 2020-12-31 13F Merck COM 58933Y105 162,526 2,152 1.34 13,295 -0.06 0.8309
2020-11-03 2020-09-30 13F Merck COM 58933Y105 160,374 31,726 24.66 13,303 33.73 1.7173
2020-07-17 2020-06-30 13F/A-1 Merck COM 58933Y105 128,648 61,549 91.73 9,948 92.72 1.3917
2020-07-17 2020-06-30 13F Merck COM 58933Y105 41 -67,058 9,948 1,392,117.2132
2020-05-05 2020-03-31 13F Merck COM 58933Y105 67,099 58,577 687.36 5,163 566.06 0.9252
2020-02-04 2019-12-31 13F Merck COM 58933Y105 8,522 783 10.12 775 19.05 0.1024
2019-10-30 2019-09-30 13F Merck COM 58933Y105 7,739 -33,055 -81.03 651 -80.96 0.0959
2019-08-05 2019-06-30 13F Merck COM 58933Y105 40,794 -190 -0.46 3,421 0.35 0.5244
2019-05-06 2019-03-31 13F Merck COM 58933Y105 40,984 -8,172 -16.62 3,409 -9.27 0.5601
2019-01-26 2018-12-31 13F Merck COM 58933Y105 49,156 554 1.14 3,756 8.96 0.7339
2018-11-14 2018-09-30 13F Merck COM 58933Y105 48,602 5,767 13.46 3,447 32.37 0.6751
2018-07-19 2018-06-30 13F MERCK COM 58933Y105 42,835 2,138 5.25 2,604 17.51 0.9737
2018-05-10 2018-03-31 13F MERCK COM 58933Y105 40,697 4,030 10.99 2,216 7.31 0.9201
2018-02-02 2017-12-31 13F MERCK COM 58933Y105 36,667 1,030 2.89 2,065 -9.39 0.8835
2017-11-07 2017-09-30 13F MERCK COM 58933Y105 35,637 1,213 3.52 2,279 3.31 1.1466
2017-07-27 2017-06-30 13F MERCK COM 58933Y105 34,424 530 1.56 2,206 2.37 1.1419
2017-05-10 2017-03-31 13F MERCK COM 58933Y105 33,894 25,358 297.07 2,155 330.14 1.1618
2017-01-27 2016-12-31 13F MERCK COM 58933Y105 8,536 0 0.00 501 -5.83 0.3274
2016-10-28 2016-09-30 13F MERCK COM 58933Y105 8,536 447 5.53 532 14.66 0.3685
2016-08-04 2016-06-30 13F MERCK COM 58933Y105 8,089 686 9.27 464 18.37 0.3133
2016-05-02 2016-03-31 13F MERCK & CO INC COM 58933Y105 7,403 0 0.00 392 0.00 0.3072
2016-02-02 2015-12-31 13F MERCK & CO INC COM 58933Y105 7,403 -172 -2.27 392 4.81 0.3303
2015-10-22 2015-09-30 13F MERCK & CO INC COM 58933Y105 7,575 429 6.00 374 -8.11 0.3215
2015-08-06 2015-06-30 13F MERCK & CO INC COM 58933Y105 7,146 0 0.00 407 -0.73 0.3378
2015-05-06 2015-03-31 13F MERCK & CO INC COM 58933Y105 7,146 0 0.00 410 0.74 0.3382
2015-02-10 2014-12-31 13F MERCK & CO INC COM 58933Y105 7,146 0 0.00 407 -3.55 0.3635
2014-11-13 2014-09-30 13F/A-1 MERCK & CO INC COM 58933Y105 7,146 1,189 19.96 422 22.32 0.4387
2014-11-07 2014-09-30 13F MERCK & CO INC COM 58933Y105 7,146 422
2014-08-06 2014-06-30 13F MERCK & CO INC COM 58933Y105 5,957 -11 -0.18 345 1.47 0.3696
2014-05-05 2014-03-31 13F MERCK & CO INC COM 58933Y105 5,968 11 0.18 340 13.71 0.3934
2014-02-07 2013-12-31 13F MERCK & CO INC COM 58933Y105 5,957 5,957 299 0.3767
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.