Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionStonebridge Capital Advisors LLC
Latest Disclosed Ownership150,773 shares
Latest Disclosed Value $ 18,136,450
Stonebridge Capital Advisors LLC reports 2.57% decrease in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - Stonebridge Capital Advisors LLC filed a 13F-HR form disclosing ownership of 150,773 shares of Merck & Co., Inc. (MX:MRK) valued at $18,136,450 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 154,754 shares of Merck & Co., Inc.. This represents a change in shares of -2.57% 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)
2026-05-14 2026-03-31 13F MERCK & CO INC COM Stock 58933Y105 150,773 -3,981 -2.57 18,136 11.34 1.2696
2026-02-12 2025-12-31 13F MERCK & CO INC COM Stock 58933Y105 154,754 1,807 1.18 16,289 26.90 1.1285
2025-11-12 2025-09-30 13F MERCK & CO INC COM Stock 58933Y105 152,947 -130 -0.08 12,837 5.93 0.9157
2025-08-15 2025-06-30 13F MERCK & CO INC COM Stock 58933Y105 153,077 -1,637 -1.06 12,118 -12.75 0.9204
2025-05-14 2025-03-31 13F MERCK & CO INC COM Stock 58933Y105 154,714 7,570 5.14 13,887 -5.12 1.1310
2025-02-14 2024-12-31 13F MERCK & CO INC COM Stock 58933Y105 147,144 2,777 1.92 14,638 -10.72 1.1760
2024-11-14 2024-09-30 13F MERCK & CO INC COM Stock 58933Y105 144,367 7,612 5.57 16,394 -3.17 1.3368
2024-08-14 2024-06-30 13F MERCK & CO INC COM Stock 58933Y105 136,755 3,234 2.42 16,930 -3.91 1.4892
2024-05-14 2024-03-31 13F MERCK & CO INC COM Stock 58933Y105 133,521 5,212 4.06 17,618 25.95 1.5832
2024-02-14 2023-12-31 13F MERCK & CO INC COM Stock 58933Y105 128,309 4,464 3.60 13,988 9.72 1.4036
2023-11-15 2023-09-30 13F MERCK & CO INC COM Stock 58933Y105 123,845 1,901 1.56 12,750 -9.40 1.4034
2023-08-23 2023-06-30 13F MERCK & CO INC COM Stock 58933Y105 121,944 -3,949 -3.14 14,071 5.06 1.4949
2023-05-12 2023-03-31 13F MERCK & CO INC COM Stock 58933Y105 125,893 -792 -0.63 13,394 -4.71 1.5283
2023-02-14 2022-12-31 13F MERCK & CO INC COM Stock 58933Y105 126,685 -1,102 -0.86 14,056 27.71 1.6653
2022-11-14 2022-09-30 13F MERCK & CO INC COM Stock 58933Y105 127,787 525 0.41 11,005 -5.15 1.4164
2022-08-12 2022-06-30 13F MERCK & CO INC COM Stock 58933Y105 127,262 -611 -0.48 11,603 10.59 1.4060
2022-05-13 2022-03-31 13F/A-1 MERCK & CO INC COM Stock 58933Y105 127,873 5,565 4.55 10,492 11.93 1.1335
2022-05-12 2022-03-31 13F MERCK & CO INC COM Stock 58933Y105 122,308 0 9,374 1.0353
2022-02-14 2021-12-31 13F MERCK & CO INC COM Stock 58933Y105 122,308 1,519 1.26 9,374 3.33 1.0353
2021-11-15 2021-09-30 13F MERCK & CO INC COM Stock 58933Y105 120,789 6,572 5.75 9,072 2.13 1.1026
2021-08-20 2021-06-30 13F/A-1 MERCK & CO INC COM Stock 58933Y105 114,217 8,545 8.09 8,883 9.05 1.0749
2021-08-16 2021-06-30 13F MERCK & CO INC COM Stock 58933Y105 105,672 0 8,146 1.0782
2021-05-14 2021-03-31 13F MERCK & CO INC COM Stock 58933Y105 105,672 10,557 11.10 8,146 4.70 1.0782
2021-03-05 2020-12-31 13F MERCK & CO. INC COM Stock 58933Y105 95,115 4,342 4.78 7,780 3.32 1.1781
2020-11-18 2020-09-30 13F MERCK & CO. INC COM Stock 58933Y105 90,773 2,216 2.50 7,530 9.96 1.3511
2020-08-13 2020-06-30 13F MERCK & CO. INC COM Stock 58933Y105 88,557 1,241 1.42 6,848 1.94 1.2696
2020-05-15 2020-03-31 13F MERCK & CO. INC COM Stock 58933Y105 87,316 7,762 9.76 6,718 -7.15 1.4183
2020-02-14 2019-12-31 13F MERCK & CO INC COM Stock 58933Y105 79,554 -1,859 -2.28 7,235 5.57 1.1811
2019-11-12 2019-09-30 13F MERCK & CO INC COM Stock 58933Y105 81,413 -1,588 -1.91 6,853 -1.54 1.1820
2019-08-15 2019-06-30 13F MERCK & CO INC COM Stock 58933Y105 83,001 -4,135 -4.75 6,960 -3.96 1.2369
2019-05-14 2019-03-31 13F MERCK & CO INC COM Stock 58933Y105 87,136 391 0.45 7,247 9.34 1.3469
2019-02-13 2018-12-31 13F Merck COM 58933Y105 86,745 -1,360 -1.54 6,628 6.05 1.5463
2018-11-15 2018-09-30 13F Merck COM 58933Y105 88,105 510 0.58 6,250 17.55 1.2577
2018-08-14 2018-06-30 13F Merck COM 58933Y105 87,595 2,581 3.04 5,317 14.81 1.1583
2018-05-15 2018-03-31 13F Merck COM 58933Y105 85,014 4,447 5.52 4,631 2.14 1.0658
2018-02-15 2017-12-31 13F Merck COM 58933Y105 80,567 4,911 6.49 4,534 -6.40 1.0377
2017-11-15 2017-09-30 13F Merck COM 58933Y105 75,656 4,319 6.05 4,844 5.95 1.1911
2017-08-15 2017-06-30 13F Merck COM 58933Y105 71,337 1,909 2.75 4,572 3.65 1.1998
2017-05-25 2017-03-31 13F Merck COM 58933Y105 69,428 1,963 2.91 4,411 11.05 1.2005
2017-02-15 2016-12-31 13F Merck COM 58933Y105 67,465 3,241 5.05 3,972 -0.90 1.1787
2016-11-14 2016-09-30 13F Merck COM 58933Y105 64,224 2,674 4.34 4,008 13.03 1.2544
2016-08-16 2016-06-30 13F Merck COM 58933Y105 61,550 4,930 8.71 3,546 18.36 1.2040
2016-05-19 2016-03-31 13F Merck COM 58933Y105 56,620 2,326 4.28 2,996 4.46 1.0558
2016-02-04 2015-12-31 13F Merck COM 58933Y105 54,294 5,201 10.59 2,868 18.27 1.0479
2015-11-23 2015-09-30 13F Merck COM 58933Y105 49,093 2,820 6.09 2,425 -7.93 0.9753
2015-08-14 2015-06-30 13F Merck COM 58933Y105 46,273 3,031 7.01 2,634 5.95 1.0121
2015-05-15 2015-03-31 13F Merck COM 58933Y105 43,242 6,073 16.34 2,486 17.76 0.9593
2015-02-17 2014-12-31 13F Merck COM 58933Y105 37,169 350 0.95 2,111 -3.30 0.8671
2014-11-14 2014-09-30 13F Merck COM 58933Y105 36,819 954 2.66 2,183 5.20 0.9619
2014-08-14 2014-06-30 13F Merck COM 58933Y105 35,865 1,654 4.83 2,075 6.85 0.9356
2014-05-12 2014-03-31 13F Merck COM 58933Y105 34,211 1,859 5.75 1,942 19.95 0.9499
2014-03-03 2013-12-31 13F Merck COM 58933Y105 32,352 32,352 1,619 0.8338
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.