Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionWestover Capital Advisors, LLC
Latest Disclosed Ownership11,842 shares
Latest Disclosed Value $ 1,424,585
Westover Capital Advisors, LLC reports 109.59% increase in ownership of MRK / Merck & Co., Inc.

On May 5, 2026 - Westover Capital Advisors, LLC filed a 13F-HR form disclosing ownership of 11,842 shares of Merck & Co., Inc. (MX:MRK) valued at $1,424,585 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 5,650 shares of Merck & Co., Inc.. This represents a change in shares of 109.59% 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)
2026-05-05 2026-03-31 13F MERCK COM 58933Y105 11,842 6,192 109.59 1,425 139.73 0.2622
2026-02-09 2025-12-31 13F MERCK COM 58933Y105 5,650 5,650 595 0.1083
2025-08-11 2025-06-30 13F MERCK COM 58933Y105 0 -5,593 -100.00 0 -100.00
2025-05-06 2025-03-31 13F MERCK COM 58933Y105 5,593 -32,631 -85.37 502 -86.80 0.1115
2025-02-06 2024-12-31 13F MERCK COM 58933Y105 38,224 -3,485 -8.36 3,803 -19.72 0.8368
2024-11-08 2024-09-30 13F MERCK COM 58933Y105 41,709 -807 -1.90 4,736 -10.01 0.9103
2024-08-08 2024-06-30 13F MERCK COM 58933Y105 42,516 -941 -2.17 5,263 -8.21 1.3560
2024-05-03 2024-03-31 13F MERCK COM 58933Y105 43,457 312 0.72 5,734 21.92 1.6783
2024-02-06 2023-12-31 13F MERCK COM 58933Y105 43,145 3,823 9.72 4,704 16.18 1.5309
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 39,322 -1,034 -2.56 4,048 -13.06 1.4665
2023-08-11 2023-06-30 13F MERCK COM 58933Y105 40,356 -47 -0.12 4,657 8.33 1.6179
2023-05-22 2023-03-31 13F MERCK COM 58933Y105 40,403 -851 -2.06 4,298 -6.10 1.5925
2023-05-18 2022-12-31 13F MERCK COM 58933Y105 41,254 2,383 6.13 4,577 36.71 1.8090
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 38,871 2,389 6.55 3,348 0.66 1.2797
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 36,482 3,082 9.23 3,326 21.39 1.2267
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 33,400 -1,298 -3.74 2,740 3.05 0.8545
2022-02-14 2021-12-31 13F MERCK COM 58933Y105 34,698 1,256 3.76 2,659 5.85 0.7739
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 33,442 2,440 7.87 2,512 4.19 0.7862
2021-08-10 2021-06-30 13F MERCK COM 58933Y105 31,002 4,678 17.77 2,411 18.83 0.7735
2021-05-18 2021-03-31 13F MERCK & CO. COM 58933Y105 26,324 12,307 87.80 2,029 76.90 0.6982
2021-02-16 2020-12-31 13F MERCK & CO. COM 58933Y105 14,017 196 1.42 1,147 0.09 0.4131
2020-11-19 2020-09-30 13F MERCK & CO. COM 58933Y105 13,821 3,066 28.51 1,146 37.74 0.4703
2020-08-14 2020-06-30 13F MERCK & CO. COM 58933Y105 10,755 7,531 233.59 832 235.48 0.3901
2020-05-18 2020-03-31 13F MERCK & CO. COM 58933Y105 3,224 3,224 248 0.1342
2014-11-14 2014-09-30 13F MERCK COM 58933Y105 0 -4,259 -100.00 0 -100.00
2014-08-12 2014-06-30 13F MERCK COM 58933Y105 4,259 -49 -1.14 246 0.41 0.2076
2014-05-08 2014-03-31 13F MERCK COM 58933Y105 4,308 0 0.00 245 13.43 0.2285
2014-02-13 2013-12-31 13F MERCK COM 58933Y105 4,308 0 0.00 216 5.37 0.2060
2013-11-13 2013-09-30 13F/A-1 MERCK COM 58933Y105 4,308 -2,645 -38.04 205 -36.53 0.2123
2013-11-12 2013-09-30 13F MERCK COM 58933Y105 4,308 200
2013-08-13 2013-06-30 13F MERCK COM 58933Y105 6,953 6,953 323 0.3171
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.