Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionBay Harbor Wealth Management, LLC
Latest Disclosed Ownership239 shares
Latest Disclosed Value $ 28,941
Bay Harbor Wealth Management, LLC reports 48.45% increase in ownership of MRK / Merck & Co., Inc.

On April 14, 2026 - Bay Harbor Wealth Management, LLC filed a 13F-HR form disclosing ownership of 239 shares of Merck & Co., Inc. (MX:MRK) valued at $28,941 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 161 shares of Merck & Co., Inc.. This represents a change in shares of 48.45% 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)
2026-04-14 2026-03-31 13F MERCK & CO INC COM Common Stock 58933Y105 239 78 48.45 29 64.71 0.0075
2026-02-02 2025-12-31 13F MERCK & CO INC COM Common Stock 58933Y105 161 127 373.53 17 750.00 0.0045
2025-10-09 2025-09-30 13F MERCK & CO INC COM Common Stock 58933Y105 34 14 70.00 3 100.00 0.0008
2025-07-22 2025-06-30 13F MERCK & CO INC COM Common Stock 58933Y105 20 20 2 0.0005
2025-05-12 2025-03-31 13F MERCK & CO INC COM Common Stock 58933Y105 0 -710 -100.00 0 -100.00
2025-01-27 2024-12-31 13F MERCK & CO INC COM Common Stock 58933Y105 710 13 1.87 71 -10.13 0.0231
2024-10-24 2024-09-30 13F MERCK & CO INC COM Common Stock 58933Y105 697 -27 -3.73 80 -12.22 0.0260
2024-07-24 2024-06-30 13F MERCK & CO INC COM Common Stock 58933Y105 724 -3 -0.41 90 -6.25 0.0314
2024-04-22 2024-03-31 13F MERCK & CO INC COM Common Stock 58933Y105 727 -4 -0.55 96 20.00 0.0346
2024-01-26 2023-12-31 13F MERCK & CO INC COM Common Stock 58933Y105 731 9 1.25 80 8.11 0.0307
2023-10-25 2023-09-30 13F MERCK & CO INC COM Common Stock 58933Y105 722 8 1.12 75 -9.76 0.0315
2023-07-19 2023-06-30 13F MERCK & CO INC COM Common Stock 58933Y105 714 -57 -7.39 83 0.00 0.0338
2023-05-03 2023-03-31 13F MERCK & CO INC COM Common Stock 58933Y105 771 -227 -22.75 83 0.0351
2023-01-25 2022-12-31 13F MERCK & CO INC COM Common Stock 58933Y105 998 -6 -0.60 0 -100.00 0.0498
2022-11-02 2022-09-30 13F MERCK & CO INC COM Common Stock 58933Y105 1,004 0 0.00 87 -5.43 0.0410
2022-08-05 2022-06-30 13F MERCK & CO INC COM Common Stock 58933Y105 1,004 -138 -12.08 92 -2.13 0.0415
2022-04-19 2022-03-31 13F MERCK & CO INC COM Common Stock 58933Y105 1,142 148 14.89 94 22.08 0.0380
2022-02-10 2021-12-31 13F MERCK & CO INC COM Common Stock 58933Y105 994 913 1,127.16 77 1,183.33 0.0310
2021-11-24 2021-09-30 13F MERCK & CO INC COM Common Stock 58933Y105 81 -358 -81.55 6 -82.35 0.0025
2021-07-28 2021-06-30 13F MERCK & CO INC COM Common Stock 58933Y105 439 -212 -32.57 34 -33.33 0.0145
2021-05-05 2021-03-31 13F MERCK & CO. INC COM Common Stock 58933Y105 651 -1,476 -69.39 51 -70.69 0.0234
2021-02-09 2020-12-31 13F MERCK & CO. INC COM Stock 58933Y105 2,127 -309 -12.68 174 -13.86 0.0789
2020-10-27 2020-09-30 13F MERCK & CO. INC COM Stock 58933Y105 2,436 -354 -12.69 202 -6.48 0.1006
2020-07-16 2020-06-30 13F Merck Common Stock 58933Y105 2,790 510 22.37 216 23.43 0.1152
2020-05-20 2020-03-31 13F Merck Common Stock 58933Y105 2,280 1,455 176.36 175 133.33 0.1062
2020-01-27 2019-12-31 13F Merck Common Stock 58933Y105 825 -36 -4.18 75 2.74 0.0405
2019-10-15 2019-09-30 13F Merck Common Stock 58933Y105 861 -32 -3.58 73 -2.67 0.0436
2019-07-18 2019-06-30 13F Merck Common Stock 58933Y105 893 316 54.77 75 56.25 0.0465
2019-04-22 2019-03-31 13F Merck Common Stock 58933Y105 577 477 477.00 48 500.00 0.0327
2019-02-14 2018-12-31 13F Merck Common Stock 58933Y105 100 100 8 0.0064
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.