Merck & Co., Inc.
DE ˙ XTRA ˙ US58933Y1055
102,78 € ↑2,84 (2,84%)
2026-06-04
DEL PRIS
SecurityDE:6MK / Merck & Co., Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership27,090,023 shares
Latest Disclosed Value $ 3,258,658,868
Northern Trust Corp reports 0.53% decrease in ownership of 6MK / Merck & Co., Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 27,090,023 shares of Merck & Co., Inc. (DE:6MK) valued at $2,822,780,397 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 27,234,642 shares of Merck & Co., Inc.. This represents a change in shares of -0.53% during the quarter. The current value of the position is $2,784,312,564 USD.

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 27,090,023 -144,619 -0.53 3,258,659 13.67 0.0883
2026-02-17 2025-12-31 13F MERCK COM 58933Y105 27,234,642 -698,499 -2.50 2,866,718 22.28 0.3655
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 27,933,141 -812,286 -2.83 2,344,429 3.03 0.2999
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 28,745,427 -1,645,437 -5.41 2,275,488 -16.58 0.3129
2025-05-13 2025-03-31 13F MERCK COM 58933Y105 30,390,864 -986,243 -3.14 2,727,884 -12.61 0.4050
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 31,377,107 4,511,742 16.79 3,121,395 2.31 0.4420
2024-11-13 2024-09-30 13F MERCK COM 58933Y105 26,865,365 45,089 0.17 3,050,831 -8.12 0.4994
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 26,820,276 -279,350 -1.03 3,320,350 -7.14 0.5595
2024-05-14 2024-03-31 13F MERCK COM 58933Y105 27,099,626 -1,392,018 -4.89 3,575,796 15.12 0.6178
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 28,491,644 -1,367,979 -4.58 3,106,159 1.04 0.5622
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 29,859,623 1,186,842 4.14 3,074,048 -7.09 0.5954
2023-08-11 2023-06-30 13F MERCK COM 58933Y105 28,672,781 -1,812,290 -5.94 3,308,552 2.01 0.6358
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 30,485,071 271,188 0.90 3,243,307 -3.25 0.6430
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 30,213,883 323,762 1.08 3,352,230 30.23 0.7035
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 29,890,121 -59,566 -0.20 2,574,137 -5.73 0.5880
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 29,949,687 214,082 0.72 2,730,513 11.92 0.5848
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 29,735,605 -276,664 -0.92 2,439,807 6.07 0.4292
2022-02-08 2021-12-31 13F MERCK COM 58933Y105 30,012,269 -1,015,659 -3.27 2,300,141 -1.30 0.3768
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 31,027,928 -233,505 -0.75 2,330,508 -4.14 0.4125
2021-08-13 2021-06-30 13F MERCK COM 58933Y105 31,261,433 -824,860 -2.57 2,431,201 -1.71 0.4283
2021-05-12 2021-03-31 13F MERCK & CO. COM 58933Y105 32,086,293 -784,867 -2.39 2,473,533 -8.01 0.4601
2021-02-11 2020-12-31 13F MERCK & CO. COM 58933Y105 32,871,160 -869,221 -2.58 2,688,861 -3.93 0.5237
2020-11-16 2020-09-30 13F MERCK & CO. COM 58933Y105 33,740,381 -20,323 -0.06 2,798,766 7.20 0.6137
2020-08-14 2020-06-30 13F MERCK & CO. COM 58933Y105 33,760,704 860,185 2.61 2,610,716 3.13 0.6185
2020-05-14 2020-03-31 13F MERCK & CO. COM 58933Y105 32,900,519 794,881 2.48 2,531,366 -13.31 0.7267
2020-02-14 2019-12-31 13F MERCK COM 58933Y105 32,105,638 -520,032 -1.59 2,920,008 6.32 0.6536
2019-11-13 2019-09-30 13F MERCK COM 58933Y105 32,625,670 -21,818 -0.07 2,746,429 0.33 0.6574
2019-08-13 2019-06-30 13F MERCK COM 58933Y105 32,647,488 -160,497 -0.49 2,737,492 0.32 0.6494
2019-05-13 2019-03-31 13F MERCK COM 58933Y105 32,807,985 310,226 0.95 2,728,640 9.89 0.6740
2019-02-12 2018-12-31 13F MERCK COM 58933Y105 32,497,759 951,911 3.02 2,483,154 10.96 0.6965
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 31,545,848 -1,064,310 -3.26 2,237,863 13.06 0.5477
2018-09-18 2018-06-30 13F/A-1 MERCK COM 58933Y105 32,610,158 -708,595 -2.13 1,979,437 9.07 0.5026
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 32,788,811 -529,942 1,990,281
2018-05-09 2018-03-31 13F MERCK COM 58933Y105 33,318,753 -2,287,595 -6.42 1,814,873 -9.42 0.4722
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 35,606,348 -1,326,222 -3.59 2,003,569 -15.28 0.5074
2017-11-13 2017-09-30 13F MERCK COM 58933Y105 36,932,570 1,654,054 4.69 2,364,793 4.59 0.6163
2017-08-11 2017-06-30 13F MERCK COM 58933Y105 35,278,516 -596,602 -1.66 2,261,000 -0.81 0.6322
2017-05-12 2017-03-31 13F MERCK COM 58933Y105 35,875,118 287,632 0.81 2,279,505 8.81 0.6573
2017-02-13 2016-12-31 13F MERCK COM 58933Y105 35,587,486 -649,596 -1.79 2,095,036 -7.36 0.6426
2016-11-09 2016-09-30 13F MERCK COM 58933Y105 36,237,082 411,890 1.15 2,261,555 9.58 0.7044
2016-08-12 2016-06-30 13F MERCK COM 58933Y105 35,825,192 -288,561 -0.80 2,063,888 8.22 0.6700
2016-08-19 2016-03-31 13F/A-1 MERCK & CO INC COM 58933Y105 36,113,753 -1,272,570 -3.40 1,907,060 -3.43 0.6326
2016-05-13 2016-03-31 13F Merck & Co Inc COMM 58933Y105 36,113,601 1,910,771
2016-02-12 2015-12-31 13F Merck & Co Inc COMM 58933Y105 37,386,323 -2,287,052 -5.76 1,974,745 0.78 0.6546
2015-11-12 2015-09-30 13F Merck & Co Inc COMM 58933Y105 39,673,375 39,673,375 0.00 1,959,469 0.6539
2015-08-13 2015-06-30 13F Merck & Co Inc COMM 58933Y105 0 -40,997,822 -100.00 0 -100.00
2015-05-14 2015-03-31 13F Merck & Co Inc COMM 58933Y105 40,997,822 -1,348,712 -3.18 2,356,554 -2.01 0.7087
2015-02-12 2014-12-31 13F Merck & Co Inc COM 58933Y105 42,346,534 -509,019 -1.19 2,404,860 -5.34 0.7261
2014-11-13 2014-09-30 13F MERCK & CO INC NEW COM COM 58933Y105 42,855,553 -955,161 -2.18 2,540,476 0.24 0.7979
2014-08-14 2014-06-30 13F MERCK & CO INC com 58933Y105 43,810,714 81,160 0.19 2,534,449 2.09 0.7899
2014-05-14 2014-03-31 13F MERCK & CO INC COM 58933Y105 43,729,554 -344,193 -0.78 2,482,527 12.54 0.7810
2014-02-21 2013-12-31 13F/A-1 MERCK & CO INC COM 58933Y105 44,073,747 176,988 0.40 2,205,891 5.55 0.7074
2014-02-12 2013-12-31 13F MERCK & CO INC COM 58933Y105 44,073,747 2,205,891
2013-11-13 2013-09-30 13F MERCK & CO INC COM 58933Y105 43,896,759 -2,423,775 -5.23 2,089,881 -2.87 0.7360
2013-08-09 2013-06-30 13F MERCK & CO INC COM 58933Y105 46,320,534 46,320,534 2,151,589 0.7797
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.