Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionPnc Financial Services Group, Inc.
Latest Disclosed Ownership7,530,441 shares
Latest Disclosed Value $ 905,836,778
Pnc Financial Services Group, Inc. reports 1.20% decrease in ownership of MRK / Merck & Co., Inc.

On May 8, 2026 - Pnc Financial Services Group, Inc. filed a 13F-HR form disclosing ownership of 7,530,441 shares of Merck & Co., Inc. (MX:MRK) valued at $905,836,778 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 7,621,832 shares of Merck & Co., Inc.. This represents a change in shares of -1.20% 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)
2026-05-08 2026-03-31 13F MERCK COM 58933Y105 7,530,441 -91,391 -1.20 905,837 12.91 0.5230
2026-02-06 2025-12-31 13F MERCK COM 58933Y105 7,621,832 -246,130 -3.13 802,274 21.49 0.4381
2025-11-07 2025-09-30 13F MERCK COM 58933Y105 7,867,962 144,703 1.87 660,358 8.01 0.4005
2025-08-08 2025-06-30 13F MERCK COM 58933Y105 7,723,259 -120,912 -1.54 611,373 -13.17 0.3940
2025-05-09 2025-03-31 13F MERCK COM 58933Y105 7,844,171 -255,900 -3.16 704,093 -12.62 0.3687
2025-02-07 2024-12-31 13F MERCK COM 58933Y105 8,100,071 -122,121 -1.49 805,795 -13.70 0.5387
2024-11-08 2024-09-30 13F MERCK COM 58933Y105 8,222,192 -124,005 -1.49 933,712 -9.63 0.5960
2024-08-09 2024-06-30 13F MERCK COM 58933Y105 8,346,197 -105,139 -1.24 1,033,259 -7.34 0.6879
2024-05-10 2024-03-31 13F MERCK COM 58933Y105 8,451,336 -342,205 -3.89 1,115,154 16.32 0.7751
2024-03-22 2023-12-31 13F/A-1 MERCK COM 58933Y105 8,793,541 -102,251 -1.15 958,672 4.68 0.7530
2024-02-09 2023-12-31 13F MERCK COM 58933Y105 8,793,541 -102,251 958,672 0.7530
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 8,895,792 -92,889 -1.03 915,822 -11.70 0.7839
2023-08-11 2023-06-30 13F MERCK COM 58933Y105 8,988,681 -135,977 -1.49 1,037,204 6.84 0.8836
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 9,124,658 -151,170 -1.63 970,772 -5.67 0.8516
2023-02-10 2022-12-31 13F MERCK COM 58933Y105 9,275,828 64,883 0.70 1,029,153 29.74 0.9882
2022-11-10 2022-09-30 13F MERCK COM 58933Y105 9,210,945 -166,383 -1.77 793,246 -7.22 0.8294
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 9,377,328 75,978 0.82 854,932 12.02 0.8387
2022-05-12 2022-03-31 13F MERCK COM 58933Y105 9,301,350 -9,859 -0.11 763,176 6.95 0.6690
2022-02-11 2021-12-31 13F MERCK Common Stock 58933Y105 9,311,209 192,954 2.12 713,611 4.20 0.5901
2021-11-05 2021-09-30 13F MERCK Common Stock 58933Y105 9,118,255 -103,887 -1.13 684,873 -4.51 0.6335
2021-08-06 2021-06-30 13F MERCK Common Stock 58933Y105 9,222,142 48,684 0.53 717,206 1.42 0.6502
2021-05-07 2021-03-31 13F MERCK Common Stock 58933Y105 9,173,458 -94,136 -1.02 707,182 -6.72 0.6863
2021-02-12 2020-12-31 13F MERCK Common Stock 58933Y105 9,267,594 -13,957 -0.15 758,088 -1.53 0.7650
2020-11-06 2020-09-30 13F MERCK Common Stock 58933Y105 9,281,551 204,967 2.26 769,905 9.69 0.9490
2020-08-28 2020-06-30 13F/A-1 MERCK Common Stock 58933Y105 9,076,584 2,435 0.03 701,894 0.53 0.9339
2020-08-07 2020-06-30 13F MERCK Common Stock 58933Y105 9,076,584 2,435 701,894 145,740.1499
2020-05-08 2020-03-31 13F MERCK Common Stock 58933Y105 9,074,149 -47,266 -0.52 698,165 -15.84 0.8787
2020-02-07 2019-12-31 13F MERCK Common Stock 58933Y105 9,121,415 674,344 7.98 829,592 16.67 0.8166
2019-11-08 2019-09-30 13F MERCK Common Stock 58933Y105 8,447,071 -193,316 -2.24 711,074 -1.85 0.7093
2019-08-09 2019-06-30 13F MERCK Common Stock 58933Y105 8,640,387 -131,770 -1.50 724,496 -0.70 0.7101
2019-05-10 2019-03-31 13F MERCK Common Stock 58933Y105 8,772,157 -314,061 -3.46 729,579 5.08 0.7306
2019-02-08 2018-12-31 13F MERCK Common Stock 58933Y105 9,086,218 -69,548 -0.76 694,277 6.89 0.7731
2018-11-09 2018-09-30 13F MERCK Common Stock 58933Y105 9,155,766 -125,805 -1.36 649,511 15.29 0.6167
2018-08-10 2018-06-30 13F MERCK Common Stock 58933Y105 9,281,571 -43,900 -0.47 563,391 10.91 0.5560
2018-05-11 2018-03-31 13F MERCK Common Stock 58933Y105 9,325,471 -133,089 -1.41 507,960 -4.56 0.5005
2018-02-09 2017-12-31 13F MERCK Common Stock 58933Y105 9,458,560 -236,984 -2.44 532,234 -14.27 0.5165
2017-11-13 2017-09-30 13F MERCK Common Stock 58933Y105 9,695,544 -131,594 -1.34 620,804 -1.43 0.6447
2017-08-11 2017-06-30 13F MERCK & CO 58933Y105 9,827,138 5,575 0.06 629,820 0.92 0.6768
2017-05-12 2017-03-31 13F MERCK Common Stock 58933Y105 9,821,563 41,748 0.43 624,064 8.39 0.6910
2017-02-10 2016-12-31 13F MERCK Common Stock 58933Y105 9,779,815 -10,726 -0.11 575,738 -5.78 0.6565
2016-11-04 2016-09-30 13F MERCK Common Stock 58933Y105 9,790,541 -135,164 -1.36 611,028 6.86 0.7110
2016-08-05 2016-06-30 13F MERCK Common Stock 58933Y105 9,925,705 -380,697 -3.69 571,819 4.86 0.6700
2016-05-06 2016-03-31 13F MERCK Common Stock 58933Y105 10,306,402 -647,204 -5.91 545,312 -5.75 0.6370
2016-02-05 2015-12-31 13F MERCK Common Stock 58933Y105 10,953,606 -951,770 -7.99 578,569 -1.61 0.6814
2015-11-06 2015-09-30 13F MERCK Common Stock 58933Y105 11,905,376 -210,876 -1.74 588,007 -14.75 0.7023
2015-08-05 2015-06-30 13F MERCK Common Stock 58933Y105 12,116,252 -524,940 -4.15 689,779 -5.07 0.7715
2015-05-08 2015-03-31 13F MERCK Common Stock 58933Y105 12,641,192 -37,550 -0.30 726,617 0.92 0.7981
2015-02-06 2014-12-31 13F/A-1 MERCK Common Stock 58933Y105 12,678,742 -18,112 -0.14 720,026 -4.34 0.7910
2015-02-06 2014-12-31 13F MERCK Common Stock 58933Y105 12,678,742 720,026
2014-11-07 2014-09-30 13F MERCK & CO INC COM 58933Y105 12,696,854 647,313 5.37 752,671 7.98 0.8865
2014-08-08 2014-06-30 13F MERCK & CO INC COM 58933Y105 12,049,541 -95,140 -0.78 697,066 1.10 0.8876
2014-05-09 2014-03-31 13F MERCK & CO INC COM 58933Y105 12,144,681 544,862 4.70 689,453 18.75 0.9067
2014-02-07 2013-12-31 13F MERCK & CO INC COM 58933Y105 11,599,819 -435,016 -3.61 580,570 1.33 0.7703
2013-11-01 2013-09-30 13F MERCK & CO INC COM 58933Y105 12,034,835 -113,854 -0.94 572,968 1.54 0.8349
2013-08-02 2013-06-30 13F MERCK & CO INC COM 58933Y105 12,148,689 12,148,689 564,305 0.8252
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.