Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionInvesco Ltd.
Latest Disclosed Ownership21,855,101 shares
Latest Disclosed Value $ 2,628,950,044
Invesco Ltd. reports 6.37% increase in ownership of 6MK / Merck & Co., Inc.

On May 12, 2026 - Invesco Ltd. filed a 13F-HR form disclosing ownership of 21,855,101 shares of Merck & Co., Inc. (BG:6MK) valued at $2,628,950,044 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 19, 2026 disclosing 20,546,185 shares of Merck & Co., Inc.. This represents a change in shares of 6.37% 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)
2026-05-12 2026-03-31 13F MERCK COM 58933Y105 21,855,101 1,308,916 6.37 2,628,950 21.56 0.0501
2026-02-19 2025-12-31 13F MERCK COM 58933Y105 20,546,185 701,249 3.53 2,162,691 29.85 0.3316
2025-11-13 2025-09-30 13F MERCK COM 58933Y105 19,844,936 2,821,766 16.58 1,665,585 23.60 0.2624
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 17,023,170 1,725,036 11.28 1,347,554 -1.86 0.2292
2025-05-12 2025-03-31 13F MERCK COM 58933Y105 15,298,134 -154,106 -1.00 1,373,160 -10.67 0.2601
2025-02-13 2024-12-31 13F MERCK COM 58933Y105 15,452,240 2,847,934 22.59 1,537,189 7.39 0.2842
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 12,604,306 -3,192,055 -20.21 1,431,345 -26.81 0.2763
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 15,796,361 -262,178 -1.63 1,955,590 -7.71 0.4136
2024-05-14 2024-03-31 13F MERCK COM 58933Y105 16,058,539 -699,071 -4.17 2,118,924 15.98 0.4551
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 16,757,610 -915,207 -5.18 1,826,915 0.41 0.4347
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 17,672,817 -3,729,753 -17.43 1,819,417 -26.33 0.4900
2023-08-11 2023-06-30 13F MERCK COM 58933Y105 21,402,570 2,455,377 12.96 2,469,643 22.51 0.6474
2023-05-12 2023-03-31 13F MERCK COM 58933Y105 18,947,193 1,025,444 5.72 2,015,792 1.38 0.5623
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 17,921,749 270,778 1.53 1,988,418 30.81 0.5824
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 17,650,971 -1,795,320 -9.23 1,520,103 -14.26 0.4893
2022-08-15 2022-06-30 13F MERCK COM 58933Y105 19,446,291 -600,853 -3.00 1,772,917 7.78 0.5372
2022-05-16 2022-03-31 13F MERCK COM 58933Y105 20,047,144 -153,985 -0.76 1,644,869 6.24 0.4196
2022-02-14 2021-12-31 13F MERCK COM 58933Y105 20,201,129 739,839 3.80 1,548,216 5.92 0.3732
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 19,461,290 5,687,973 41.30 1,461,738 36.46 0.3704
2021-08-17 2021-06-30 13F MERCK COM 58933Y105 13,773,317 2,551,921 22.74 1,071,150 23.82 0.2635
2021-05-17 2021-03-31 13F MERCK & CO. COM 58933Y105 11,221,396 -4,036,494 -26.46 865,058 -30.69 0.2309
2021-02-16 2020-12-31 13F MERCK & CO. COM 58933Y105 15,257,890 -240,295 -1.55 1,248,094 -2.92 0.3633
2020-11-16 2020-09-30 13F MERCK & CO. COM 58933Y105 15,498,185 -928,865 -5.65 1,285,576 1.20 0.4346
2020-08-14 2020-06-30 13F MERCK & CO. COM 58933Y105 16,427,050 -1,144,137 -6.51 1,270,304 -6.04 0.4542
2020-05-15 2020-03-31 13F MERCK & CO. COM 58933Y105 17,571,187 -633,251 -3.48 1,351,926 -18.35 0.5690
2020-02-14 2019-12-31 13F MERCK COM 58933Y105 18,204,438 -910,587 -4.76 1,655,692 2.90 0.5141
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 19,115,025 805,887 4.40 1,609,102 4.81 0.4208
2019-08-14 2019-06-30 13F/A-1 MERCK COM 58933Y105 18,309,138 2,843,458 18.39 1,535,222 19.35 0.3951
2019-08-14 2019-06-30 13F MERCK COM 58933Y105 18,309,138 -15,450,980 1,535,222
2019-05-15 2019-03-31 13F MERCK COM 58933Y105 15,465,680 -4,467,903 -22.41 1,286,280 -15.55 0.4338
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 19,933,583 -655,945 -3.19 1,523,125 4.28 0.5830
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 20,589,528 57,973 0.28 1,460,619 17.20 0.4596
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 20,531,555 968,761 4.95 1,246,264 16.96 0.4125
2018-05-15 2018-03-31 13F MERCK COM 58933Y105 19,562,794 2,043,584 11.66 1,065,587 8.09 0.3983
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 17,519,210 1,507,005 9.41 985,806 -3.85 0.3555
2017-11-14 2017-09-30 13F MERCK COM 58933Y105 16,012,205 -4,460,983 -21.79 1,025,263 -21.86 0.3787
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 20,473,188 -3,617,763 -15.02 1,312,125 -14.28 0.4083
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 24,090,951 -596,674 -2.42 1,530,739 5.32 0.5026
2017-02-14 2016-12-31 13F MERCK COM 58933Y105 24,687,625 902,843 3.80 1,453,360 -2.09 0.4885
2016-11-14 2016-09-30 13F MERCK COM 58933Y105 23,784,782 -1,398,243 -5.55 1,484,409 2.32 0.5100
2016-08-15 2016-06-30 13F MERCK COM 58933Y105 25,183,025 -526,004 -2.05 1,450,795 6.66 0.5329
2016-05-16 2016-03-31 13F MERCK & CO INC COM 58933Y105 25,709,029 -1,623,417 -5.94 1,360,265 -5.78 0.5529
2016-02-16 2015-12-31 13F MERCK & CO INC COM 58933Y105 27,332,446 1,660,273 6.47 1,443,702 13.86 0.5761
2015-11-16 2015-09-30 13F MERCK & CO INC COM 58933Y105 25,672,173 -114,622 -0.44 1,267,949 -13.63 0.5379
2015-08-14 2015-06-30 13F MERCK COMMON 58933Y105 25,786,795 412,679 1.63 1,468,042 0.65 0.5761
2015-05-15 2015-03-31 13F MERCK COMMON 58933Y105 25,374,116 985,633 4.04 1,458,507 5.31 0.5643
2015-02-13 2014-12-31 13F MERCK COMMON 58933Y105 24,388,483 -588,332 -2.36 1,385,024 -6.46 0.5351
2014-11-14 2014-09-30 13F MERCK COMMON 58933Y105 24,976,815 -252,111 -1.00 1,480,628 1.45 0.5912
2014-08-14 2014-06-30 13F MERCK COMMON 58933Y105 25,228,926 -747,406 -2.88 1,459,492 -1.03 0.5742
2014-05-15 2014-03-31 13F MERCK COMMON 58933Y105 25,976,332 -2,974,173 -10.27 1,474,678 1.77 0.5983
2014-02-13 2013-12-31 13F MERCK COMMON 58933Y105 28,950,505 1,671,791 6.13 1,448,972 11.57 0.5754
2013-11-13 2013-09-30 13F MERCK COMMON 58933Y105 27,278,714 -1,272,940 -4.46 1,298,712 -2.07 0.5645
2013-08-14 2013-06-30 13F MERCK COMMON 58933Y105 28,551,654 28,551,654 1,326,225 0.6183
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.