Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionFirst Trust Advisors Lp
Latest Disclosed Ownership4,465,569 shares
Latest Disclosed Value $ 537,163,234
First Trust Advisors Lp reports 3.52% decrease in ownership of MRK / Merck & Co., Inc.

On May 13, 2026 - First Trust Advisors Lp filed a 13F-HR form disclosing ownership of 4,465,569 shares of Merck & Co., Inc. (MX:MRK) valued at $537,163,234 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 4,628,360 shares of Merck & Co., Inc.. This represents a change in shares of -3.52% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-13 2026-03-31 13F MERCK COM 58933Y105 4,465,569 -162,791 -3.52 537,163 10.26 0.3828
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 4,628,360 -383,251 -7.65 487,181 15.82 0.3541
2025-11-12 2025-09-30 13F MERCK COM 58933Y105 5,011,611 -38,130 -0.76 420,624 5.23 0.3126
2025-08-13 2025-06-30 13F MERCK COM 58933Y105 5,049,741 2,211,568 77.92 399,738 56.91 0.3215
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 2,838,173 1,930,936 212.84 254,754 182.27 0.2256
2025-02-13 2024-12-31 13F MERCK COM 58933Y105 907,237 254,691 39.03 90,252 21.79 0.0796
2024-11-13 2024-09-30 13F MERCK COM 58933Y105 652,546 62,892 10.67 74,103 1.51 0.0706
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 589,654 7,239 1.24 72,999 -5.01 0.0744
2024-05-13 2024-03-31 13F MERCK COM 58933Y105 582,415 -208,922 -26.40 76,850 -10.92 0.0780
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 791,337 -1,736,922 -68.70 86,272 -66.86 0.0941
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 2,528,259 -93,504 -3.57 260,284 -13.96 0.3085
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 2,621,763 -259,125 -8.99 302,525 -1.30 0.3440
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 2,880,888 -36,903 -1.26 306,498 -5.32 0.3539
2023-02-09 2022-12-31 13F MERCK COM 58933Y105 2,917,791 -111,114 -3.67 323,725 24.10 0.3850
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 3,028,905 -274,280 -8.30 260,849 -13.38 0.3382
2022-08-12 2022-06-30 13F MERCK COM 58933Y105 3,303,185 1,007,703 43.90 301,151 59.89 0.3718
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 2,295,482 -1,952,926 -45.97 188,344 -42.15 0.1927
2022-02-08 2021-12-31 13F MERCK COM 58933Y105 4,248,408 -157,298 -3.57 325,598 -1.61 0.3167
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 4,405,706 -37,664 -0.85 330,913 -4.24 0.3559
2021-10-12 2021-06-30 13F/A-1 MERCK COM 58933Y105 4,443,370 1,620,114 57.38 345,561 58.75 0.3740
2021-08-16 2021-06-30 13F MERCK COM 58933Y105 4,443,370 1,620,114 345,561 0.3564
2021-05-14 2021-03-31 13F MERCK & CO. COM 58933Y105 2,823,256 147,997 5.53 217,681 -0.53 0.2636
2021-02-02 2020-12-31 13F MERCK & CO. COM 58933Y105 2,675,259 345,862 14.85 218,836 13.26 0.2900
2020-11-05 2020-09-30 13F MERCK & CO. COM 58933Y105 2,329,397 175,561 8.15 193,223 16.01 0.3095
2020-07-22 2020-06-30 13F MERCK & CO. COM 58933Y105 2,153,836 400,124 22.82 166,556 23.44 0.2887
2020-05-06 2020-03-31 13F MERCK & CO. COM 58933Y105 1,753,712 205,628 13.28 134,931 -4.17 0.3057
2020-02-03 2019-12-31 13F MERCK COM 58933Y105 1,548,084 126,279 8.88 140,798 17.64 0.2404
2019-11-04 2019-09-30 13F MERCK COM 58933Y105 1,421,805 33,165 2.39 119,688 2.79 0.2253
2019-07-30 2019-06-30 13F MERCK COM 58933Y105 1,388,640 -232,286 -14.33 116,437 -13.63 0.2195
2019-06-19 2019-03-31 13F/A-1 MERCK COM 58933Y105 1,620,926 449,768 38.40 134,812 50.65 0.2681
2019-05-09 2019-03-31 13F MERCK COM 58933Y105 1,620,926 449,768 134,812
2019-02-07 2018-12-31 13F MERCK COM 58933Y105 1,171,158 91,586 8.48 89,488 16.85 0.2122
2018-10-25 2018-09-30 13F MERCK COM 58933Y105 1,079,572 -95,745 -8.15 76,585 7.35 0.1426
2018-08-02 2018-06-30 13F MERCK COM 58933Y105 1,175,317 708,451 151.75 71,342 180.54 0.1479
2018-04-23 2018-03-31 13F MERCK COM 58933Y105 466,866 -72,798 -13.49 25,430 -16.26 0.0584
2018-02-08 2017-12-31 13F MERCK COM 58933Y105 539,664 145,323 36.85 30,367 20.27 0.0723
2017-10-24 2017-09-30 13F MERCK COM 58933Y105 394,341 56,289 16.65 25,250 16.54 0.0650
2017-08-02 2017-06-30 13F MERCK COM 58933Y105 338,052 -1,490,173 -81.51 21,666 -81.35 0.0578
2017-05-02 2017-03-31 13F MERCK COM 58933Y105 1,828,225 21,430 1.19 116,165 9.21 0.3219
2017-02-06 2016-12-31 13F MERCK COM 58933Y105 1,806,795 107,003 6.30 106,366 0.27 0.3166
2016-11-01 2016-09-30 13F MERCK COM 58933Y105 1,699,792 -124,317 -6.82 106,084 0.95 0.3167
2016-08-04 2016-06-30 13F MERCK COM 58933Y105 1,824,109 735,572 67.57 105,087 82.46 0.3309
2016-05-10 2016-03-31 13F MERCK & CO INC COM 58933Y105 1,088,537 -719,738 -39.80 57,595 -39.70 0.1850
2016-05-04 2015-12-31 13F/A-1 MERCK & CO INC COM 58933Y105 1,808,275 -130,789 -6.74 95,513 -0.27 0.2479
2016-02-03 2015-12-31 13F MERCK & CO INC COM 58933Y105 1,850,775 97,758
2015-11-05 2015-09-30 13F MERCK & CO INC COM 58933Y105 1,939,064 131,354 7.27 95,770 -6.94 0.2774
2015-08-04 2015-06-30 13F MERCK & CO INC COM 58933Y105 1,807,710 1,688,763 1,419.76 102,913 1,405.24 0.2671
2015-05-04 2015-03-31 13F MERCK & CO INC COM 58933Y105 118,947 -204,308 -63.20 6,837 -62.76 0.0201
2015-02-13 2014-12-31 13F MERCK & CO INC COM 58933Y105 323,255 232,930 257.88 18,358 242.88 0.0619
2014-11-12 2014-09-30 13F MERCK & CO INC COM 58933Y105 90,325 -21,047 -18.90 5,354 -16.90 0.0211
2014-08-11 2014-06-30 13F MERCK & CO INC COM 58933Y105 111,372 -1,223,526 -91.66 6,443 -91.50 0.0268
2014-05-12 2014-03-31 13F MERCK & CO INC COM 58933Y105 1,334,898 -67,338 -4.80 75,782 7.98 0.3330
2014-08-08 2013-12-31 13F/A-1 MERCK & CO INC COM 58933Y105 1,402,236 -73,894 -5.01 70,182 -0.14 0.3403
2014-02-13 2013-12-31 13F MERCK & CO INC COM 58933Y105 1,402,236 70,182
2013-11-12 2013-09-30 13F MERCK & CO INC COM 58933Y105 1,476,130 80,759 5.79 70,277 8.43 0.3809
2013-08-12 2013-06-30 13F MERCK & CO INC COM 58933Y105 1,395,371 1,395,371 64,815 0.4217
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.