Merck & Co., Inc.
US ˙ NYSE ˙ US58933Y1055

SecurityMRK / Merck & Co., Inc.
InstitutionShell Asset Management Co
Latest Disclosed Ownership39,209 shares
Latest Disclosed Value $ 3,291
Shell Asset Management Co reports 51.99% decrease in ownership of MRK / Merck & Co., Inc.

On November 7, 2025 - Shell Asset Management Co filed a 13F-HR form disclosing ownership of 39,209 shares of Merck & Co., Inc. (US:MRK) valued at $3,290,811 USD as of September 30, 2025. The entity filed a previous 13F-HR on July 23, 2025 disclosing 81,674 shares of Merck & Co., Inc.. This represents a change in shares of -51.99% during the quarter. The current value of the position is $4,715,274 USD.

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)
2025-11-07 2025-09-30 13F MERCK COM 58933Y105 39,209 -42,465 -51.99 3 -50.00 0.3305
2025-07-23 2025-06-30 13F MERCK COM 58933Y105 81,674 22,202 37.33 6 20.00 0.2232
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 59,472 -1,874 -3.05 5 -16.67 0.2534
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 61,346 -2,318 -3.64 6 -14.29 0.2666
2024-11-07 2024-09-30 13F MERCK COM 58933Y105 63,664 -1,113 -1.72 7 -12.50 0.3182
2024-07-25 2024-03-31 13F MERCK COM 58933Y105 64,777 -542 -0.83 8 14.29 0.3651
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 65,319 -16,617 -20.28 7 -12.50 0.3289
2023-11-08 2023-09-30 13F MERCK COM 58933Y105 81,936 -1,214 -1.46 8 -11.11 0.3485
2023-07-28 2023-06-30 13F MERCK COM 58933Y105 83,150 -11,033 -11.71 10 -10.00 0.3784
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 94,183 -3,217 -3.30 10 0.00 0.4158
2023-02-07 2022-12-31 13F MERCK COM 58933Y105 97,400 -19,270 -16.52 11 -99.90 0.4734
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 116,670 -27,365 -19.00 10,048 -23.48 0.3916
2022-08-09 2022-06-30 13F MERCK COM 58933Y105 144,035 7,021 5.12 13,132 16.81 0.3885
2022-05-04 2022-03-31 13F MERCK COM 58933Y105 137,014 -4,518 -3.19 11,242 3.64 0.2653
2022-02-09 2021-12-31 13F MERCK COM 58933Y105 141,532 -17,115 -10.79 10,847 -8.97 0.2226
2021-11-04 2021-09-30 13F MERCK COM 58933Y105 158,647 -113,922 -41.80 11,916 -43.79 0.2675
2021-08-12 2021-06-30 13F MERCK COM 58933Y105 272,569 -10,873 -3.84 21,198 -2.99 0.4109
2021-05-10 2021-03-31 13F MERCK & CO. COM 58933Y105 283,442 -39,099 -12.12 21,851 -17.18 0.4372
2021-02-16 2020-12-31 13F MERCK & CO. COM 58933Y105 322,541 4,175 1.31 26,384 -0.09 0.5448
2020-11-13 2020-09-30 13F MERCK & CO. COM 58933Y105 318,366 -2,458 -0.77 26,408 6.45 0.6140
2020-08-10 2020-06-30 13F MERCK & CO. COM 58933Y105 320,824 6,358 2.02 24,809 2.54 0.6193
2020-05-11 2020-03-31 13F MERCK & CO. COM 58933Y105 314,466 -22,147 -6.58 24,195 -20.97 0.6741
2020-02-13 2019-12-31 13F MERCK COM 58933Y105 336,613 -17,634 -4.98 30,615 2.66 0.6595
2019-11-12 2019-09-30 13F MERCK COM 58933Y105 354,247 -18,150 -4.87 29,821 -4.50 0.6810
2019-08-12 2019-06-30 13F MERCK COM 58933Y105 372,397 -16,946 -4.35 31,225 -3.57 0.6909
2019-05-09 2019-03-31 13F MERCK COM 58933Y105 389,343 -26,076 -6.28 32,382 2.02 0.7140
2019-02-13 2018-12-31 13F MERCK COM 58933Y105 415,419 -94,166 -18.48 31,742 -12.19 0.7911
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 509,585 -21,424 -4.03 36,150 12.16 0.7135
2018-08-10 2018-06-30 13F MERCK COM 58933Y105 531,009 -86,798 -14.05 32,232 -4.22 0.6608
2018-05-14 2018-03-31 13F MERCK COM 58933Y105 617,807 17,001 2.83 33,652 -0.46 0.6700
2018-02-09 2017-12-31 13F MERCK COM 58933Y105 600,806 76,852 14.67 33,807 0.77 0.6711
2017-10-20 2017-09-30 13F/A-1 MERCK COM 58933Y105 523,954 -38,670 -6.87 33,549 -6.96 0.7460
2017-10-18 2017-09-30 13F MERCK COM 58933Y105 1,028,790 466,166 60,987
2017-07-26 2017-06-30 13F MERCK COM 58933Y105 562,624 1,944 0.35 36,059 1.22 0.8949
2017-04-26 2017-03-31 13F MERCK COM 58933Y105 560,680 7,143 1.29 35,626 9.33 0.9094
2017-01-10 2016-12-31 13F MERCK COM 58933Y105 553,537 -97,131 -14.93 32,587 -19.75 0.8811
2016-10-28 2016-09-30 13F MERCK COM 58933Y105 650,668 -22,795 -3.38 40,608 4.67 0.9720
2016-07-25 2016-06-30 13F MERCK COM 58933Y105 673,463 52,501 8.45 38,798 18.09 0.9001
2016-05-11 2016-03-31 13F MERCK & CO INC COM 58933Y105 620,962 -33,925 -5.18 32,855 -5.02 0.7867
2016-02-05 2015-12-31 13F MERCK & CO INC COM 58933Y105 654,887 -373,903 -36.34 34,591 -43.28 0.8167
2015-10-13 2015-09-30 13F MERCK & CO INC COM 58933Y105 1,028,790 201,726 24.39 60,987 29.53 0.9665
2015-07-30 2015-06-30 13F MERCK & CO INC COM 58933Y105 827,064 -118,613 -12.54 47,085 -13.38 0.9421
2015-05-07 2015-03-31 13F MERCK & CO INC COM 58933Y105 945,677 945,677 0.00 54,358 0.9464
2015-02-04 2014-12-31 13F MERCK & CO INC COM 58933Y105 0 -1,028,790 -100.00 0 -100.00
2014-10-24 2014-09-30 13F MERCK & CO INC COM 58933Y105 1,028,790 -14,307 -1.37 60,987 1.07 0.9469
2014-08-08 2014-06-30 13F MERCK & CO INC COM 58933Y105 1,043,097 61,350 6.25 60,343 8.27 0.9300
2014-05-07 2014-03-31 13F MERCK & CO INC COM 58933Y105 981,747 63,222 6.88 55,734 21.23 0.9261
2014-02-03 2013-12-31 13F/A-1 MERCK & CO INC COM 58933Y105 918,525 24,458 2.74 45,972 8.00 0.7823
2014-01-27 2013-12-31 13F MERCK & CO INC COM 58933Y105 918,525 45,972
2013-10-28 2013-09-30 13F MERCK & CO INC COM 58933Y105 894,067 -19,747 -2.16 42,566 0.28 0.7820
2013-08-01 2013-06-30 13F MERCK & CO INC COM 58933Y105 913,814 913,814 42,447 0.8081
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.