Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionJanney Montgomery Scott LLC
Latest Disclosed Ownership1,679,664 shares
Latest Disclosed Value $ 202,047
Janney Montgomery Scott LLC reports 7.33% decrease in ownership of MRK / Merck & Co., Inc.

On April 22, 2026 - Janney Montgomery Scott LLC filed a 13F-HR form disclosing ownership of 1,679,664 shares of Merck & Co., Inc. (MX:MRK) valued at $202,047 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 1,812,552 shares of Merck & Co., Inc.. This represents a change in shares of -7.33% 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)
2026-04-22 2026-03-31 13F MERCK Common Stock 58933Y105 1,679,664 -132,888 -7.33 202 6.32 0.5001
2026-02-11 2025-12-31 13F MERCK Common Stock 58933Y105 1,812,552 -38,495 -2.08 191 22.58 0.4376
2025-10-27 2025-09-30 13F MERCK Common Stock 58933Y105 1,851,047 6,642 0.36 155 6.16 0.3682
2025-07-17 2025-06-30 13F MERCK Common Stock 58933Y105 1,844,405 -42,991 -2.28 146 -13.61 0.3816
2025-04-17 2025-03-31 13F MERCK Common Stock 58933Y105 1,887,396 -15,113 -0.79 169 -10.58 0.4802
2025-01-17 2024-12-31 13F MERCK Common Stock 58933Y105 1,902,509 35,525 1.90 189 -10.85 0.5245
2024-10-29 2024-09-30 13F MERCK Common Stock 58933Y105 1,866,984 37,216 2.03 212 -6.19 0.5919
2024-07-25 2024-06-30 13F MERCK Common Stock 58933Y105 1,829,768 72,199 4.11 227 -2.16 0.6906
2024-05-01 2024-03-31 13F MERCK Common Stock 58933Y105 1,757,569 4,179 0.24 232 20.94 0.6896
2024-02-08 2023-12-31 13F MERCK COMPANY INC Common Stock 58933Y105 1,753,390 -116,212 -6.22 191 -0.52 0.6203
2023-11-08 2023-09-30 13F MERCK COMPANY INC Common Stock 58933Y105 1,869,602 11,911 0.64 192 -10.28 0.7174
2023-07-26 2023-06-30 13F MERCK COMPANY INC Common Stock 58933Y105 1,857,691 8,699 0.47 214 9.18 0.7477
2023-04-28 2023-03-31 13F MERCK COMPANY INC Common Stock 58933Y105 1,848,992 -27,928 -1.49 197 -5.77 0.8031
2023-02-01 2022-12-31 13F MERCK COMPANY INC Common Stock 58933Y105 1,876,920 -4,042 -0.21 208 -99.87 0.8110
2022-10-25 2022-09-30 13F MERCK COMPANY INC Common Stock 58933Y105 1,880,962 76,484 4.24 161,989 -2.10 0.6941
2022-08-03 2022-06-30 13F MERCK COMPANY INC Common Stock 58933Y105 1,804,478 159,397 9.69 165,460 22.58 0.7473
2022-05-04 2022-03-31 13F LLOYDS BANKING SPONS ADR Common Stock 58933Y105 1,645,081 28,745 1.78 134,979 8.96 0.5772
2022-01-27 2021-12-31 13F MERCK COMPANY INC Common Stock 58933Y105 1,616,336 18,166 1.14 123,876 3.20 0.4806
2021-10-29 2021-09-30 13F MERCK COMPANY INC Common Stock 58933Y105 1,598,170 22,374 1.42 120,039 -2.05 0.5133
2021-07-26 2021-06-30 13F MERCK COMPANY INC Common Stock 58933Y105 1,575,796 94,143 6.35 122,550 7.29 0.5404
2021-04-27 2021-03-31 13F MERCK COMPANY INC Common Stock 58933Y105 1,481,653 11,223 0.76 114,221 -5.04 0.5550
2021-01-25 2020-12-31 13F MERCK COMPANY INC Common Stock 58933Y105 1,470,430 50,579 3.56 120,281 2.13 0.5811
2020-11-06 2020-09-30 13F MERCK COMPANY INC Common Stock 58933Y105 1,419,851 47,610 3.47 117,777 10.99 0.6716
2020-07-23 2020-06-30 13F MERCK COMPANY INC Common Stock 58933Y105 1,372,241 209,990 18.07 106,115 18.67 0.6706
2020-04-30 2020-03-31 13F MERCK COMPANY INC Common Stock 58933Y105 1,162,251 100,764 9.49 89,424 -7.37 0.7075
2020-01-21 2019-12-31 13F MERCK COMPANY INC Common Stock 58933Y105 1,061,487 -11,557 -1.08 96,542 6.88 0.6338
2019-10-29 2019-09-30 13F MERCK COMPANY INC Common Stock 58933Y105 1,073,044 16,857 1.60 90,329 2.00 0.6573
2019-07-29 2019-06-30 13F MERCK COMPANY INC Common Stock 58933Y105 1,056,187 2,472 0.23 88,561 1.05 0.6800
2019-04-30 2019-03-31 13F/A-1 MERCK COMPANY INC Common Stock 58933Y105 1,053,715 22,334 2.17 87,638 11.20 0.7209
2019-04-30 2019-03-31 13F MERCK COMPANY INC Common Stock 58933Y105 1,031,381 0 78,808
2019-02-01 2018-12-31 13F MERCK COMPANY INC Common Stock 58933Y105 1,031,381 18,285 1.80 78,808 9.66 0.7595
2018-11-05 2018-09-30 13F MERCK COMPANY INC Common Stock 58933Y105 1,013,096 25,423 2.57 71,869 19.88 0.6189
2018-07-24 2018-06-30 13F MERCK COMPANY INC Common Stock 58933Y105 987,673 2,171 0.22 59,952 11.68 0.5765
2018-04-19 2018-03-31 13F MERCK COMPANY INC Common Stock 58933Y105 985,502 100,077 11.30 53,680 7.74 0.5402
2018-02-14 2017-12-31 13F MERCK COMPANY INC Common Stock 58933Y105 885,425 38,632 4.56 49,823 -8.11 0.5175
2017-11-15 2017-09-30 13F MERCK COMPANY INC Common Stock 58933Y105 846,793 7,123 0.85 54,220 0.75 0.6179
2017-07-27 2017-06-30 13F MERCK COMPANY INC Common Stock 58933Y105 839,670 10,268 1.24 53,814 2.11 0.6720
2017-04-26 2017-03-31 13F MERCK COMPANY INC Common Stock 58933Y105 829,402 -8,939 -1.07 52,700 6.78 0.7016
2017-02-13 2016-12-31 13F MERCK &#x002B COMPANY INC Common Stock 58933Y105 838,341 33,077 4.11 49,353 -1.80 0.7443
2016-11-14 2016-09-30 13F MERCK + COMPANY INC Common Stock 58933Y105 805,264 222,580 38.20 50,257 63.29 0.8852
2016-08-05 2016-06-30 13F MERCK + COMPANY INC Common Stock 58933Y105 582,684 -70,088 -10.74 30,777 -10.89 0.4865
2016-05-10 2016-03-31 13F MERCK + COMPANY INC Common Stock 58933Y105 652,772 70,088 12.03 34,538 12.22 0.9046
2016-02-19 2015-12-31 13F MERCK + COMPANY INC Common Stock 58933Y105 582,684 -7,572 -1.28 30,777 5.57 0.7949
2015-11-16 2015-09-30 13F MERCK + COMPANY INC Common Stock 58933Y105 590,256 19,789 3.47 29,153 -10.23 0.8229
2015-08-04 2015-06-30 13F MERCK + COMPANY INC Common Stock 58933Y105 570,467 23,032 4.21 32,477 3.21 0.6799
2015-05-12 2015-03-31 13F/A-1 MERCK + COMPANY INC Common Stock 58933Y105 547,435 14,567 2.73 31,467 3.99 0.5861
2015-04-30 2015-03-31 13F MERCK + COMPANY INC Common Stock 58933Y105 547,435 31,467
2015-02-10 2014-12-31 13F MERCK + COMPANY INC Common Stock 58933Y105 532,868 20,984 4.10 30,262 -0.27 0.6055
2014-11-14 2014-09-30 13F MERCK + COMPANY INC Common Stock 58933Y105 511,884 14,724 2.96 30,344 5.51 0.6314
2014-08-13 2014-06-30 13F MERCK + COMPANY INC Common Stock 58933Y105 497,160 12,161 2.51 28,761 4.46 0.6267
2014-05-14 2014-03-31 13F MERCK + COMPANY INC Common Stock 58933Y105 484,999 -9,545 -1.93 27,533 11.24 0.6663
2014-02-19 2013-12-31 13F MERCK + COMPANY INC Common Stock 58933Y105 494,544 -5,624 -1.12 24,752 -99.90 0.6538
2013-11-14 2013-09-30 13F MERCK + COMPANY INC Common Stock 58933Y105 500,168 353,120 240.14 23,812,513 248.63 0.7152
2013-08-13 2013-06-30 13F MERCK & CO INC COMMON 58933Y105 147,048 147,048 6,830,377 0.7139
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.