Merck & Co., Inc.
CH ˙ SWX ˙ US58933Y1055
SecurityCH:MRK / Merck & Co., Inc.
InstitutionAdvisory Services Network, LLC
Latest Disclosed Ownership143,304 shares
Latest Disclosed Value $ 17,238,120
Advisory Services Network, LLC reports 4.96% increase in ownership of MRK / Merck & Co., Inc.

On May 15, 2026 - Advisory Services Network, LLC filed a 13F-HR form disclosing ownership of 143,304 shares of Merck & Co., Inc. (CH:MRK) valued at $17,238,120 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 136,528 shares of Merck & Co., Inc.. This represents a change in shares of 4.96% 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)
2026-05-15 2026-03-31 13F MERCK & CO INC COM Stock 58933Y105 143,304 6,776 4.96 17,238 19.95 0.1593
2026-02-17 2025-12-31 13F MERCK & CO INC COM Stock 58933Y105 136,528 18,462 15.64 14,371 45.03 0.2034
2025-11-18 2025-09-30 13F MERCK Stock 58933Y105 118,066 -6,444 -5.18 9,909 1.88 0.1453
2025-08-19 2025-06-30 13F MERCK Stock 58933Y105 124,510 10,045 8.78 9,727 -5.33 0.1566
2025-05-15 2025-03-31 13F MERCK Stock 58933Y105 114,465 -349 -0.30 10,274 -10.04 0.1974
2025-02-13 2024-12-31 13F MERCK Stock 58933Y105 114,814 -14,252 -11.04 11,422 -28.52 0.2128
2024-11-14 2024-09-30 13F MERCK Stock 58933Y105 129,066 0 0.00 15,978 0.00 0.3303
2024-08-13 2024-06-30 13F MERCK Stock 58933Y105 129,066 6,853 5.61 15,978 -0.92 0.3303
2024-05-06 2024-03-31 13F MERCK Stock 58933Y105 122,213 2,349 1.96 16,126 23.41 0.3576
2024-02-09 2023-12-31 13F MERCK Stock 58933Y105 119,864 -10,725 -8.21 13,068 -2.80 0.3194
2023-11-14 2023-09-30 13F MERCK Stock 58933Y105 130,589 -2,333 -1.76 13,444 -12.34 0.3611
2023-08-09 2023-06-30 13F MERCK Stock 58933Y105 132,922 -6,057 -4.36 15,338 3.73 0.4087
2023-05-17 2023-03-31 13F MERCK Stock 58933Y105 138,979 4,385 3.26 14,786 -0.98 0.4096
2023-02-13 2022-12-31 13F MERCK Stock 58933Y105 134,594 8,762 6.96 14,933 37.82 0.4577
2022-11-14 2022-09-30 13F MERCK Stock 58933Y105 125,832 3,228 2.63 10,835 -3.07 0.3825
2022-08-02 2022-06-30 13F MERCK Stock 58933Y105 122,604 10,215 9.09 11,178 21.20 0.3823
2022-05-23 2022-03-31 13F MERCK Stock 58933Y105 112,389 364 0.32 9,223 7.42 0.2715
2022-02-14 2021-12-31 13F MERCK Stock 58933Y105 112,025 16 0.01 8,586 2.06 0.2470
2021-11-05 2021-09-30 13F MERCK Stock 58933Y105 112,009 10,479 10.32 8,413 6.56 0.2675
2021-08-12 2021-06-30 13F MERCK Stock 58933Y105 101,530 2,798 2.83 7,895 3.72 0.2491
2021-05-24 2021-03-31 13F MERCK & CO. Stock 58933Y105 98,732 8,987 10.01 7,612 3.69 0.2828
2021-02-09 2020-12-31 13F MERCK & CO. Stock 58933Y105 89,745 -264 -0.29 7,341 -1.67 0.2945
2020-11-16 2020-09-30 13F MERCK & CO. Stock 58933Y105 90,009 938 1.05 7,466 8.41 0.3514
2020-08-10 2020-06-30 13F MERCK Stock 58933Y105 89,071 7,312 8.94 6,887 9.47 0.3780
2020-05-15 2020-03-31 13F MERCK & CO. Stock 58933Y105 81,759 7,495 10.09 6,291 -6.87 0.4115
2020-02-04 2019-12-31 13F MERCK Stock 58933Y105 74,264 14,565 24.40 6,755 34.94 0.3553
2019-11-04 2019-09-30 13F MERCK Stock 58933Y105 59,699 0 0.00 5,006 0.00 0.3067
2019-08-01 2019-06-30 13F MERCK Stock 58933Y105 59,699 30 0.05 5,006 0.89 0.3070
2019-05-20 2019-03-31 13F MERCK Stock 58933Y105 59,669 -195 -0.33 4,962 8.51 0.3485
2019-02-15 2018-12-31 13F MERCK Stock 58933Y105 59,864 5,901 10.94 4,573 19.46 0.3991
2018-11-02 2018-09-30 13F MERCK Stock 58933Y105 53,963 1,655 3.16 3,828 14.34 0.2794
2018-07-27 2018-06-30 13F MERCK Stock 58933Y105 52,308 -3,232 -5.82 3,348 10.68 0.2551
2018-04-23 2018-03-31 13F MERCK Stock 58933Y105 55,540 8,725 18.64 3,025 14.84 0.2416
2018-02-08 2017-12-31 13F MERCK Stock 58933Y105 46,815 7,861 20.18 2,634 5.61 0.2296
2017-10-12 2017-09-30 13F MERCK Stock 58933Y105 38,954 -1,435 -3.55 2,494 -3.67 0.2855
2017-08-17 2017-06-30 13F MERCK & CO INC COM Stock 58933Y105 40,389 -5,283 -11.57 2,589 -10.79 0.3374
2017-04-28 2017-03-31 13F MERCK & CO INC COM Stock 58933Y105 45,672 5,350 13.27 2,902 15.34 0.4215
2016-10-07 2016-09-30 13F MERCK Stock 58933Y105 40,322 21,328 112.29 2,516 129.98 0.4730
2016-07-27 2016-06-30 13F MERCK Stock 58933Y105 18,994 1,909 11.17 1,094 21.02 0.2487
2016-04-21 2016-03-31 13F MERCK & CO INC Stock 58933Y105 17,085 7,055 70.34 904 70.57 0.2468
2016-01-27 2015-12-31 13F MERCK & CO INC NEW COM Stock 58933Y105 10,030 1,080 12.07 530 19.91 0.1704
2015-10-01 2015-09-30 13F MERCK Stock 58933Y105 8,950 -1,611 -15.25 442 -27.06 0.1334
2015-07-02 2015-06-30 13F MERCK Stock 58933Y105 10,561 -3,685 -25.87 606 -25.64 0.1788
2015-04-08 2015-03-31 13F MERCK Stock 58933Y105 14,246 2,588 22.20 815 11.64 0.2250
2015-01-23 2014-12-31 13F MERCK Stock 58933Y105 11,658 -821 -6.58 730 -1.35 0.2282
2014-10-07 2014-09-30 13F MERCK & CO INC NEW COM Stock 58933Y105 12,479 -324 -2.53 740 -0.13 0.2706
2014-07-10 2014-06-30 13F MERCK Stock 58933Y105 12,803 3,102 31.98 741 34.48 0.3137
2014-04-09 2014-03-31 13F MERCK & CO INC NEW COM Stock 58933Y105 9,701 -667 -6.43 551 6.17 0.2841
2014-02-13 2013-12-31 13F MERCK & CO INC Stock 58933Y105 10,368 10,368 519 0.2606
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.