Merck & Co., Inc.
CH ˙ SWX ˙ US58933Y1055
SecurityCH:MRK / Merck & Co., Inc.
Institution1st Source Bank
Latest Disclosed Ownership94,306 shares
Latest Disclosed Value $ 11,344,069
1st Source Bank reports 0.91% decrease in ownership of MRK / Merck & Co., Inc.

On May 4, 2026 - 1st Source Bank filed a 13F-HR form disclosing ownership of 94,306 shares of Merck & Co., Inc. (CH:MRK) valued at $11,344,069 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 95,176 shares of Merck & Co., Inc.. This represents a change in shares of -0.91% 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)
2026-05-04 2026-03-31 13F MERCK COM 58933Y105 94,306 -870 -0.91 11,344 13.24 0.5853
2026-02-05 2025-12-31 13F MERCK COM 58933Y105 95,176 -891 -0.93 10,018 24.26 0.5255
2025-11-12 2025-09-30 13F MERCK COM 58933Y105 96,067 -2,555 -2.59 8,063 3.28 0.4250
2025-08-07 2025-06-30 13F MERCK COM 58933Y105 98,622 409 0.42 7,807 -11.45 0.4305
2025-05-05 2025-03-31 13F MERCK COM 58933Y105 98,213 -1,349 -1.35 8,816 -11.00 0.5195
2025-02-10 2024-12-31 13F Merck COM 58933Y105 99,562 -2,193 -2.16 9,904 -14.29 0.5665
2024-12-11 2024-09-30 13F Merck COM 58933Y105 101,755 -682 -0.67 11,555 -8.88 0.6523
2024-08-08 2024-06-30 13F MERCK COM 58933Y105 102,437 9,044 9.68 12,682 2.91 0.7415
2024-05-09 2024-03-31 13F MERCK COM 58933Y105 93,393 -6,047 -6.08 12,323 13.68 0.7163
2024-02-08 2023-12-31 13F MERCK COM 58933Y105 99,440 26 0.03 10,841 5.92 0.6550
2023-11-09 2023-09-30 13F MERCK COM 58933Y105 99,414 -1,080 -1.07 10,235 -11.75 0.6968
2023-08-09 2023-06-30 13F MERCK COM 58933Y105 100,494 -1,989 -1.94 11,596 6.36 0.7486
2023-05-09 2023-03-31 13F MERCK COM 58933Y105 102,483 -1,659 -1.59 10,903 -5.63 0.7246
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 104,142 -2,068 -1.95 11,555 26.31 0.7584
2022-11-04 2022-09-30 13F MERCK COM 58933Y105 106,210 486 0.46 9,147 -5.09 0.6654
2022-08-05 2022-06-30 13F MERCK COM 58933Y105 105,724 -2,062 -1.91 9,638 8.98 0.6807
2022-05-05 2022-03-31 13F MERCK COM 58933Y105 107,786 1,521 1.43 8,844 8.60 0.5435
2022-02-09 2021-12-31 13F MERCK COM 58933Y105 106,265 -1,550 -1.44 8,144 0.57 0.4764
2021-11-05 2021-09-30 13F MERCK COM 58933Y105 107,815 -3,677 -3.30 8,098 -6.60 0.5102
2021-08-03 2021-06-30 13F MERCK COM 58933Y105 111,492 1,412 1.28 8,670 2.17 0.5465
2021-05-07 2021-03-31 13F MERCK COM 58933Y105 110,080 -1,955 -1.74 8,486 -7.41 0.5614
2021-02-05 2020-12-31 13F MERCK COM 58933Y105 112,035 29 0.03 9,165 -1.36 0.6680
2020-10-30 2020-09-30 13F MERCK COM 58933Y105 112,006 -5,762 -4.89 9,291 2.02 0.7912
2020-08-07 2020-06-30 13F MERCK COM 58933Y105 117,768 915 0.78 9,107 1.29 0.7830
2020-04-29 2020-03-31 13F MERCK COM 58933Y105 116,853 1,558 1.35 8,991 -14.26 0.9044
2020-01-27 2019-12-31 13F MERCK COM 58933Y105 115,295 -2,501 -2.12 10,486 5.75 0.7855
2019-11-06 2019-09-30 13F MERCK COM 58933Y105 117,796 -2,081 -1.74 9,916 -1.35 0.8130
2019-07-29 2019-06-30 13F MERCK COM 58933Y105 119,877 -435 -0.36 10,052 0.45 0.8219
2019-04-29 2019-03-31 13F MERCK COM 58933Y105 120,312 -407 -0.34 10,007 8.49 0.8535
2019-02-11 2018-12-31 13F MERCK COM 58933Y105 120,719 -1,180 -0.97 9,224 6.66 0.8963
2018-10-31 2018-09-30 13F MERCK COM 58933Y105 121,899 -1,112 -0.90 8,648 15.82 0.6858
2018-08-02 2018-06-30 13F MERCK COM 58933Y105 123,011 -779 -0.63 7,467 10.74 0.6062
2018-04-24 2018-03-31 13F MERCK COM 58933Y105 123,790 -4,737 -3.69 6,743 -6.76 0.5585
2018-02-13 2017-12-31 13F MERCK COM 58933Y105 128,527 -1,233 -0.95 7,232 -12.96 0.5950
2017-10-27 2017-09-30 13F MERCK COM 58933Y105 129,760 -2,066 -1.57 8,309 -1.65 0.6910
2017-07-26 2017-06-30 13F MERCK COM 58933Y105 131,826 -1,375 -1.03 8,448 -0.19 0.7275
2017-04-26 2017-03-31 13F MERCK COM 58933Y105 133,201 -827 -0.62 8,464 7.26 0.7493
2017-02-09 2016-12-31 13F MERCK COM 58933Y105 134,028 -758 -0.56 7,891 -6.19 0.7493
2016-10-27 2016-09-30 13F MERCK COM 58933Y105 134,786 1,658 1.25 8,412 9.67 0.8883
2016-07-29 2016-06-30 13F MERCK COM 58933Y105 133,128 315 0.24 7,670 9.15 0.8665
2016-04-26 2016-03-31 13F MERCK COM 58933Y105 132,813 1,143 0.87 7,027 1.05 0.7846
2016-01-29 2015-12-31 13F MERCK COM 58933Y105 131,670 -3,448 -2.55 6,954 4.21 0.8071
2015-10-20 2015-09-30 13F MERCK COM 58933Y105 135,118 3,956 3.02 6,673 -10.63 0.7649
2015-08-04 2015-06-30 13F MERCK COM 58933Y105 131,162 -843 -0.64 7,467 -1.59 0.8091
2015-04-27 2015-03-31 13F MERCK COM 58933Y105 132,005 -292 -0.22 7,588 1.00 0.9096
2015-02-10 2014-12-31 13F MERCK COM 58933Y105 132,297 1,235 0.94 7,513 -3.30 0.9028
2014-10-30 2014-09-30 13F MERCK COM 58933Y105 131,062 150 0.11 7,769 2.59 1.0297
2014-07-25 2014-06-30 13F MERCK COM 58933Y105 130,912 -1,482 -1.12 7,573 0.76 0.9774
2014-04-28 2014-03-31 13F MERCK COM 58933Y105 132,394 -1,895 -1.41 7,516 11.83 1.0029
2014-02-13 2013-12-31 13F MERCK COM 58933Y105 134,289 -765 -0.57 6,721 4.53 0.9033
2013-11-13 2013-09-30 13F MERCK COM 58933Y105 135,054 -711 -0.52 6,430 1.97 0.9538
2013-08-08 2013-06-30 13F MERCK & CO INC COM 58933Y105 135,765 135,765 6,306 1.0654
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.