Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionOld Republic International Corp
Latest Disclosed Ownership705,600 shares
Latest Disclosed Value $ 84,877
Old Republic International Corp ownership in MRK / Merck & Co., Inc.

On April 27, 2026 - Old Republic International Corp filed a 13F-HR form disclosing ownership of 705,600 shares of Merck & Co., Inc. (MX:MRK) valued at $84,877 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 705,600 shares of Merck & Co., Inc.. This represents a change in shares of 0.00% 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)
2026-04-27 2026-03-31 13F MERCK Common 58933Y105 705,600 0 0.00 85 13.51 3.3733
2026-02-09 2025-12-31 13F MERCK COMMON 58933Y105 705,600 0 0.00 74 25.42 3.0002
2025-10-27 2025-09-30 13F MERCK Common 58933Y105 705,600 0 0.00 59 7.27 2.1959
2025-07-09 2025-06-30 13F MERCK Common 58933Y105 705,600 92,000 14.99 56 0.00 2.1899
2025-04-29 2025-03-31 13F MERCK Common 58933Y105 613,600 5,500 0.90 55 -8.33 2.1394
2025-02-04 2024-12-31 13F MERCK Common 58933Y105 608,100 0 0.00 60 -13.04 2.3830
2024-10-25 2024-09-30 13F MERCK Common 58933Y105 608,100 0 0.00 69 -8.00 2.5899
2024-07-29 2024-06-30 13F MERCK Common 58933Y105 608,100 -1,750 -0.29 75 -6.25 3.0658
2024-04-29 2024-03-31 13F MERCK Common 58933Y105 609,850 0 0.00 80 21.21 3.1648
2024-02-07 2023-12-31 13F MERCK Common 58933Y105 609,850 -9,000 -1.45 66 4.76 2.5053
2023-11-06 2023-09-30 13F MERCK Common 58933Y105 618,850 -142,500 -18.72 64 -27.59 2.3785
2023-08-04 2023-06-30 13F MERCK Common 58933Y105 761,350 -1,750 -0.23 88 7.41 2.8823
2023-05-18 2023-03-31 13F MERCK Common 58933Y105 763,100 -1,000 -0.13 81 -3.57 2.5966
2023-02-21 2022-12-31 13F MERCK Common 58933Y105 764,100 -5,400 -0.70 85 -99.87 2.6595
2022-11-18 2022-09-30 13F MERCK Common 58933Y105 769,500 -200,000 -20.63 66,269 -25.03 2.2004
2022-08-12 2022-06-30 13F MERCK Common 58933Y105 969,500 0 0.00 88,389 11.12 2.1324
2022-05-13 2022-03-31 13F MERCK Common 58933Y105 969,500 -27,000 -2.71 79,547 4.16 1.6138
2022-02-17 2021-12-31 13F MERCK Common 58933Y105 996,500 0 0.00 76,372 2.04 1.4513
2021-11-04 2021-09-30 13F MERCK Common 58933Y105 996,500 0 0.00 74,847 -3.42 1.5628
2021-07-29 2021-06-30 13F MERCK Common 58933Y105 996,500 320,000 47.30 77,498 48.60 1.5005
2021-05-17 2021-03-31 13F MERCK Common 58933Y105 676,500 0 0.00 52,151 -5.76 1.2314
2021-03-03 2020-12-31 13F MERCK Common 58933Y105 676,500 0 0.00 55,338 -1.39 1.3758
2020-11-04 2020-09-30 13F MERCK Common 58933Y105 676,500 0 0.00 56,116 7.27 1.5357
2020-11-04 2020-06-30 13F/A-1 MERCK Common 58933Y105 676,500 0 0.00 52,314 0.51 1.4809
2020-09-17 2020-06-30 13F MERCK Common 58933Y105 676,500 0 35,521 1,109,752.4247
2020-05-07 2020-03-31 13F MERCK Common 58933Y105 676,500 0 0.00 52,050 -15.40 1.6324
2020-01-29 2019-12-31 13F MERCK Common 58933Y105 676,500 0 0.00 61,528 8.04 1.5389
2019-10-31 2019-09-30 13F MERCK Common 58933Y105 676,500 0 0.00 56,948 0.39 1.5231
2019-08-13 2019-06-30 13F MERCK Common 58933Y105 676,500 0 0.00 56,725 0.82 1.4681
2019-04-26 2019-03-31 13F MERCK Common 58933Y105 676,500 0 0.00 56,265 8.85 1.5156
2019-01-29 2018-12-31 13F MERCK Common 58933Y105 676,500 0 0.00 51,691 7.71 1.5413
2018-10-31 2018-09-30 13F MERCK Common 58933Y105 676,500 0 0.00 47,991 16.87 1.3933
2018-08-03 2018-06-30 13F MERCK Common 58933Y105 676,500 -172,000 -20.27 41,064 -11.15 1.2663
2018-05-18 2018-03-31 13F/A-1 MERCK Common 58933Y105 848,500 0 0.00 46,218 -3.20 1.4804
2018-05-17 2018-03-31 13F MERCK Common 58933Y105 848,500 0 46,218 1,376,954.4692
2018-02-20 2017-12-31 13F MERCK Common 58933Y105 848,500 397,000 87.93 47,745 65.15 1.5164
2017-11-01 2017-09-30 13F MERCK Common 58933Y105 451,500 0 0.00 28,910 -0.09 0.9560
2017-08-02 2017-06-30 13F MERCK Common 58933Y105 451,500 0 0.00 28,937 0.87 0.9435
2017-05-22 2017-03-31 13F MERCK Common 58933Y105 451,500 0 0.00 28,688 7.93 0.9887
2017-01-31 2016-12-31 13F MERCK Common 58933Y105 451,500 0 0.00 26,580 14.70 0.9537
2016-11-17 2016-09-30 13F MERCK Common 58933Y105 451,500 0 0.00 23,174 -10.91 1.0043
2016-08-02 2016-06-30 13F MERCK Common 58933Y105 451,500 36,000 8.66 26,011 18.32 1.1623
2016-05-25 2016-03-31 13F MERCK Common 58933Y105 415,500 84,000 25.34 21,984 25.55 1.0843
2016-02-26 2015-12-31 13F MERCK Common 58933Y105 331,500 60,000 22.10 17,510 30.39 0.9386
2015-11-04 2015-09-30 13F MERCK Common 58933Y105 271,500 0 0.00 13,429 -13.11 0.7338
2015-08-05 2015-06-30 13F MERCK Common 58933Y105 271,500 0 0.00 15,456 -0.96 0.8859
2015-06-18 2015-03-31 13F MERCK Common 58933Y105 271,500 0 0.00 15,606 1.22 0.8706
2015-02-27 2014-12-31 13F MERCK Common 58933Y105 271,500 0 0.00 15,418 -4.21 0.8813
2014-11-07 2014-09-30 13F MERCK Common 58933Y105 271,500 27,000 11.04 16,095 13.79 1.3062
2014-08-06 2014-06-30 13F MERCK Common 58933Y105 244,500 31,500 14.79 14,144 16.97 1.2305
2014-05-06 2014-03-31 13F MERCK Common 58933Y105 213,000 0 0.00 12,092 13.42 1.2862
2014-02-18 2013-12-31 13F/A-1 MERCK Common 58933Y105 213,000 213,000 10,661 1.3965
2014-02-14 2013-12-31 13F MERCK Common 58933Y105 10,035,226 10,661
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.