Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionRockefeller Capital Management L.P.
Latest Disclosed Ownership1,752,898 shares
Latest Disclosed Value $ 210,858,734
Rockefeller Capital Management L.P. reports 1.79% increase in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - Rockefeller Capital Management L.P. filed a 13F-HR form disclosing ownership of 1,752,898 shares of Merck & Co., Inc. (MX:MRK) valued at $210,858,734 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on March 16, 2026 disclosing 1,722,146 shares of Merck & Co., Inc.. This represents a change in shares of 1.79% 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)
2026-05-14 2026-03-31 13F MERCK COM 58933Y105 1,752,898 30,752 1.79 210,859 16.32 0.1937
2026-03-16 2025-12-31 13F/A-1 MERCK COM 58933Y105 1,722,146 429,419 33.22 181,274 67.07 0.3264
2026-02-14 2025-12-31 13F MERCK COM 58933Y105 1,738,925 446,198 180,615 0.3252
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 1,292,727 46,549 3.74 108,499 9.99 0.2122
2025-08-14 2025-06-30 13F/A-1 MERCK COM 58933Y105 1,246,178 35,011 2.89 98,648 -9.26 0.2163
2025-08-08 2025-06-30 13F MERCK COM 58933Y105 1,246,178 35,011 98,648 0.1243
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 1,211,167 44,848 3.85 108,715 -6.40 0.2683
2025-02-13 2024-12-31 13F MERCK COM 58933Y105 1,166,319 -55,283 -4.53 116,152 -16.32 0.3008
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 1,221,602 -43,500 -3.44 138,797 -11.40 0.3736
2024-08-12 2024-06-30 13F MERCK COM 58933Y105 1,265,102 -35,750 -2.75 156,651 -8.74 0.4452
2024-05-14 2024-03-31 13F MERCK COM 58933Y105 1,300,852 -90,492 -6.50 171,648 13.16 0.5010
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 1,391,344 200,274 16.81 151,684 23.68 0.5068
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 1,191,070 68,837 6.13 122,645 -4.18 0.4730
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 1,122,233 31,590 2.90 127,992 110,237.07 0.4958
2023-05-16 2023-03-31 13F MERCK COM 58933Y105 1,090,643 -23,211 -2.08 116 -99.91 0.4990
2023-03-06 2022-12-31 13F MERCK COM 58933Y105 1,113,854 25,318 2.33 123,581 31.83 0.6211
2022-11-02 2022-09-30 13F MERCK COM 58933Y105 1,088,536 200,947 22.64 93,743 15.85 0.4845
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 887,589 64,672 7.86 80,920 19.85 0.4300
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 822,917 102,128 14.17 67,519 22.23 0.3256
2022-02-14 2021-12-31 13F MERCK COM 58933Y105 720,789 15,272 2.16 55,239 4.25 0.2578
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 705,517 17,426 2.53 52,989 -0.97 0.2784
2021-08-10 2021-06-30 13F MERCK COM 58933Y105 688,091 -36,563 -5.05 53,510 -4.21 0.3014
2021-05-11 2021-03-31 13F MERCK & CO. COM 58933Y105 724,654 59,421 8.93 55,862 2.66 0.3780
2021-02-12 2020-12-31 13F MERCK & CO. COM 58933Y105 665,233 39,352 6.29 54,414 4.82 0.4121
2020-11-13 2020-09-30 13F MERCK & CO. COM 58933Y105 625,881 36,409 6.18 51,914 13.89 0.4863
2020-08-12 2020-06-30 13F MERCK & CO. COM 58933Y105 589,472 103,356 21.26 45,584 21.88 0.4770
2020-05-12 2020-03-31 13F MERCK & CO. COM 58933Y105 486,116 111,175 29.65 37,401 9.68 0.4906
2020-02-07 2019-12-31 13F MERCK COM 58933Y105 374,941 21,016 5.94 34,100 14.45 0.4251
2019-11-12 2019-09-30 13F MERCK COM 58933Y105 353,925 62,718 21.54 29,795 22.03 0.4042
2019-08-09 2019-06-30 13F MERCK COM 58933Y105 291,207 -56,401 -16.23 24,417 -15.54 0.3405
2019-05-10 2019-03-31 13F MERCK COM 58933Y105 347,608 69,233 24.87 28,910 35.92 0.4120
2019-02-12 2018-12-31 13F MERCK COM 58933Y105 278,375 -22,501 -7.48 21,270 -0.35 0.3728
2018-11-02 2018-09-30 13F Merck Common 58933Y105 300,876 863 0.29 21,344 17.21 0.3240
2018-07-31 2018-06-30 13F Merck Common 58933Y105 300,013 -111,182 -27.04 18,210 -18.70 0.2965
2018-05-09 2018-03-31 13F Merck Common 58933Y105 411,195 411,195 22,398 0.3701
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.