Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionFifth Third Bancorp
Latest Disclosed Ownership1,543,397 shares
Latest Disclosed Value $ 185,655,231
Fifth Third Bancorp reports 162.05% increase in ownership of 6MK / Merck & Co., Inc.

On May 1, 2026 - Fifth Third Bancorp filed a 13F-HR form disclosing ownership of 1,543,397 shares of Merck & Co., Inc. (BG:6MK) valued at $185,655,231 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 588,969 shares of Merck & Co., Inc.. This represents a change in shares of 162.05% 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)
2026-05-01 2026-03-31 13F MERCK COM 58933Y105 1,543,397 954,428 162.05 185,655 199.47 0.3393
2026-02-02 2025-12-31 13F MERCK COM 58933Y105 588,969 -11,563 -1.93 61,995 23.00 0.1969
2025-11-07 2025-09-30 13F MERCK COM 58933Y105 600,532 -22,445 -3.60 50,403 2.21 0.1611
2025-07-15 2025-06-30 13F MERCK COM 58933Y105 622,977 -57,418 -8.44 49,315 -19.25 0.1705
2025-04-15 2025-03-31 13F MERCK COM 58933Y105 680,395 -60,238 -8.13 61,072 -17.11 0.2322
2025-01-21 2024-12-31 13F MERCK COM 58933Y105 740,633 -113,798 -13.32 73,678 -24.07 0.2672
2024-10-17 2024-09-30 13F MERCK COM 58933Y105 854,431 -52,851 -5.83 97,029 -13.61 0.3515
2024-07-22 2024-06-30 13F MERCK COM 58933Y105 907,282 25,521 2.89 112,322 -3.46 0.4277
2024-04-23 2024-03-31 13F MERCK COM 58933Y105 881,761 19,407 2.25 116,348 23.76 0.4551
2024-01-19 2023-12-31 13F MERCK COM 58933Y105 862,354 -69,714 -7.48 94,014 -2.02 0.3999
2023-10-31 2023-09-30 13F MERCK COM 58933Y105 932,068 -13,955 -1.48 95,956 -12.10 0.4450
2023-07-26 2023-06-30 13F MERCK COM 58933Y105 946,023 37,121 4.08 109,162 12.89 0.4819
2023-04-24 2023-03-31 13F MERCK COM 58933Y105 908,902 4,306 0.48 96,698 -3.65 0.4501
2023-01-25 2022-12-31 13F MERCK COM 58933Y105 904,596 46,844 5.46 100,365 35.87 0.4823
2022-10-25 2022-09-30 13F MERCK COM 58933Y105 857,752 -3,513 -0.41 73,870 -5.92 0.3860
2022-08-04 2022-06-30 13F MERCK COM 58933Y105 861,265 -430 -0.05 78,522 11.06 0.3797
2022-04-19 2022-03-31 13F MERCK COM 58933Y105 861,695 57,764 7.19 70,702 14.75 0.2888
2022-02-01 2021-12-31 13F MERCK COM 58933Y105 803,931 61,647 8.31 61,613 10.51 0.2395
2021-10-15 2021-09-30 13F MERCK COM 58933Y105 742,284 -18,115 -2.38 55,753 -5.72 0.2422
2021-08-06 2021-06-30 13F MERCK COM 58933Y105 760,399 -5,529 -0.72 59,136 0.15 0.2594
2021-05-07 2021-03-31 13F MERCK & CO. COM 58933Y105 765,928 -66,940 -8.04 59,045 -13.33 0.2741
2021-02-16 2020-12-31 13F MERCK & CO. COM 58933Y105 832,868 -6,512 -0.78 68,129 -2.15 0.3349
2020-11-09 2020-09-30 13F MERCK & CO. COM 58933Y105 839,380 68,895 8.94 69,627 16.86 0.3848
2020-08-05 2020-06-30 13F MERCK & CO. COM 58933Y105 770,485 27,862 3.75 59,582 4.28 0.3572
2020-05-05 2020-03-31 13F MERCK & CO. COM 58933Y105 742,623 -20,774 -2.72 57,137 -17.71 0.4077
2020-02-14 2019-12-31 13F MERCK COM 58933Y105 763,397 -8,494 -1.10 69,431 6.85 0.3866
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 771,891 -7,882 -1.01 64,978 -0.62 0.3897
2019-08-07 2019-06-30 13F MERCK COM 58933Y105 779,773 13,418 1.75 65,384 2.58 0.3995
2019-05-14 2019-03-31 13F MERCK COM 58933Y105 766,355 100,450 15.08 63,738 25.27 0.4091
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 665,905 10,858 1.66 50,882 9.50 0.3700
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 655,047 -4,505 -0.68 46,469 16.07 0.2957
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 659,552 -41,072 -5.86 40,035 4.91 0.2714
2018-05-15 2018-03-31 13F MERCK COM 58933Y105 700,624 -28,867 -3.96 38,163 -7.03 0.2600
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 729,491 -58,421 -7.41 41,048 -18.64 0.2792
2017-11-14 2017-09-30 13F MERCK COM 58933Y105 787,912 -20,113 -2.49 50,450 -2.58 0.3609
2017-08-11 2017-06-30 13F MERCK COM 58933Y105 808,025 -27,078 -3.24 51,786 -2.40 0.3812
2017-05-12 2017-03-31 13F MERCK COM 58933Y105 835,103 39,983 5.03 53,062 13.36 0.4011
2017-02-13 2016-12-31 13F/A-1 MERCK COM 58933Y105 795,120 -32,712 -3.95 46,809 -9.40 0.3775
2017-02-09 2016-12-31 13F MERCK COM 58933Y105 827,832 0 51,665 0.4276
2016-11-10 2016-09-30 13F MERCK COM 58933Y105 827,832 -4,483 -0.54 51,665 7.75 0.4276
2016-08-11 2016-06-30 13F MERCK COM 58933Y105 832,315 -13,905 -1.64 47,950 7.09 0.4072
2016-05-13 2016-03-31 13F MERCK & CO INC COM 58933Y105 846,220 -12,718 -1.48 44,774 -1.31 0.3874
2016-02-16 2015-12-31 13F MERCK & CO INC COM 58933Y105 858,938 -19,047 -2.17 45,369 4.62 0.3983
2015-11-13 2015-09-30 13F MERCK & CO INC COM 58933Y105 877,985 -51,933 -5.58 43,364 -18.09 0.4024
2015-08-14 2015-06-30 13F MERCK & CO INC COM 58933Y105 929,918 23,082 2.55 52,940 1.56 0.4616
2015-05-14 2015-03-31 13F MERCK & CO INC COM 58933Y105 906,836 18,290 2.06 52,125 3.30 0.4512
2015-02-13 2014-12-31 13F MERCK & CO INC COM 58933Y105 888,546 -34,703 -3.76 50,461 -7.80 0.4311
2014-11-17 2014-09-30 13F MERCK & CO INC COM 58933Y105 923,249 -36,671 -3.82 54,730 -1.44 0.4987
2014-08-14 2014-06-30 13F MERCK & CO INC COM 58933Y105 959,920 -23,127 -2.35 55,531 -0.50 0.5028
2014-05-15 2014-03-31 13F MERCK & CO INC COM 58933Y105 983,047 15,815 1.64 55,808 15.28 0.5244
2014-02-14 2013-12-31 13F MERCK & CO INC COM 58933Y105 967,232 -2,518 -0.26 48,410 4.85 0.4678
2013-11-14 2013-09-30 13F MERCK & CO INC COM 58933Y105 969,750 -46,401 -4.57 46,169 -2.18 0.4760
2013-08-14 2013-06-30 13F MERCK & CO INC COM 58933Y105 1,016,151 1,016,151 47,200 0.5035
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.