Merck & Co., Inc.
US ˙ NYSE ˙ US58933Y1055

SecurityMRK / Merck & Co., Inc.
InstitutionAxa S.a.
Latest Disclosed Ownership9,610 shares
Latest Disclosed Value $ 1,155,987
Axa S.a. reports 9.06% decrease in ownership of MRK / Merck & Co., Inc.

On May 15, 2026 - Axa S.a. filed a 13F-HR form disclosing ownership of 9,610 shares of Merck & Co., Inc. (US:MRK) valued at $1,155,987 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 10,567 shares of Merck & Co., Inc.. This represents a change in shares of -9.06% during the quarter. The current value of the position is $1,102,267 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)
2026-05-15 2026-03-31 13F MERCK COM 58933Y105 9,610 -957 -9.06 1,156 3.87 0.4075
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 10,567 -1,819 -14.69 1,112 7.03 0.5262
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 12,386 -1,293,946 -99.05 1,040 -99.00 0.5213
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 1,306,332 -13,668 -1.04 103,409 -12.72 0.2971
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 1,320,000 9,053 0.69 118,483 -9.15 0.3892
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 1,310,947 76,424 6.19 130,413 -6.98 0.3962
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 1,234,523 119,871 10.75 140,192 1.59 0.4151
2025-02-25 2024-06-30 13F/A-1 MERCK COM 58933Y105 1,114,652 -53,042 -4.54 137,994 -10.44 0.4105
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 1,114,652 -53,042 137,994 0.4105
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 1,167,694 -136,922 -10.50 154,077 8.33 0.4618
2024-07-16 2023-12-31 13F/A-1 MERCK COM 58933Y105 1,304,616 -241,388 -15.61 142,229 -10.64 0.4586
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 1,304,616 -241,388 142,229 0.4586
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 1,546,004 -172,109 -10.02 159,161 -19.72 0.5594
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 1,718,113 -64,844 -3.64 198,253 13.46 0.6588
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 1,782,957 -400,302 -18.34 174,730 -23.63 0.6010
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 2,183,259 -261,888 -10.71 228,806 5.38 0.8256
2023-02-14 2022-09-30 13F/A-1 Merck COM 58933Y105 2,445,147 30,184 1.25 217,129 1.02 0.8542
2022-11-14 2022-09-30 13F Merck COM 58933Y105 2,445,147 30,184 217,129 0.8542
2023-02-14 2022-06-30 13F/A-1 Merck COM 58933Y105 2,414,963 -52,322 -2.12 214,932 17.04 0.7965
2022-08-15 2022-06-30 13F Merck COM 58933Y105 2,414,963 -52,322 214,932 0.7966
2023-02-14 2022-03-31 13F/A-1 Merck COM 58933Y105 2,467,285 22,803 0.93 183,640 10.15 0.5219
2022-05-13 2022-03-31 13F Merck COM 58933Y105 2,467,285 22,803 183,639 0.5220
2022-02-14 2021-12-31 13F Merck COM 58933Y105 2,444,482 5,234 0.21 166,713 -9.01 0.4262
2021-11-15 2021-09-30 13F Merck COM 58933Y105 2,439,248 -112,249 -4.40 183,213 -7.67 0.5142
2021-08-13 2021-06-30 13F/A-1 Merck COM 58933Y105 2,551,497 166,299 6.97 198,429 7.92 0.5595
2021-08-13 2021-06-30 13F Merck COM 58933Y105 2,551,497 166,299 198,429 0.3350
2021-05-14 2021-03-31 13F Merck COM 58933Y105 2,385,198 283,769 13.50 183,874 6.97 0.5599
2021-02-12 2020-12-31 13F Merck COM 58933Y105 2,101,429 109,678 5.51 171,896 4.04 0.5395
2021-02-11 2020-09-30 13F/A-1 Merck COM 58933Y105 1,991,751 -155,541 -7.24 165,216 -0.50 0.5971
2020-11-13 2020-09-30 13F Merck COM 58933Y105 1,991,751 -155,541 165,216 329,797.3578
2021-02-12 2020-06-30 13F/A-1 MERCK & CO. COM 58933Y105 2,147,292 -18,556 -0.86 166,050 -0.35 0.6542
2020-08-14 2020-06-30 13F MERCK & CO. COM 58933Y105 2,147,292 -18,556 166,050 654,842.4068
2021-02-12 2020-03-31 13F/A-2 MERCK & CO. COM 58933Y105 2,165,848 393,632 22.21 166,641 3.39 0.8329
2020-06-15 2020-03-31 13F/A-1 MERCK & CO. COM 58933Y105 2,165,848 0 166,641 0.8335
2020-05-15 2020-03-31 13F MERCK & CO. COM 58933Y105 2,165,848 393,632 166,641 463,431.4871
2021-02-12 2019-12-31 13F/A-1 MERCK COM 58933Y105 1,772,216 105,281 6.32 161,183 14.87 0.6555
2020-02-18 2019-12-31 13F MERCK COM 58933Y105 1,772,216 105,281 161,183 656,282.0656
2021-02-12 2019-09-30 13F/A-1 MERCK COM 58933Y105 1,666,935 -57,876 -3.36 140,322 -2.98 0.5584
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 1,666,935 -57,876 140,322 559,192.1033
2021-02-12 2019-06-30 13F/A-1 MERCK COM 58933Y105 1,724,811 88,610 5.42 144,625 6.28 0.5645
2019-08-13 2019-06-30 13F MERCK COM 58933Y105 1,724,811 88,610 144,625 567,158.4197
2019-05-14 2019-03-31 13F MERCK COM 58933Y105 1,636,201 -169,460 -9.38 136,082 -1.37 0.5318
2019-02-13 2018-12-31 13F MERCK COM 58933Y105 1,805,661 -323,402 -15.19 137,970 -8.65 0.6014
2018-11-08 2018-09-30 13F MERCK COM 58933Y105 2,129,063 -882,025 -29.29 151,035 -17.36 0.5540
2018-08-13 2018-06-30 13F MERCK COM 58933Y105 3,011,088 131,486 4.57 182,773 16.53 0.7005
2018-05-14 2018-03-31 13F MERCK COM 58933Y105 2,879,602 142,331 5.20 156,852 1.83 0.6260
2018-02-13 2017-12-31 13F MERCK COM 58933Y105 2,737,271 1,470,904 116.15 154,026 89.96 0.6048
2017-12-01 2017-09-30 13F/A-1 MERCK COM 58933Y105 1,266,367 4,987 0.40 81,085 0.30 0.3493
2017-11-13 2017-09-30 13F MERCK COM 58933Y105 1,266,367 4,987 81,085
2017-08-10 2017-06-30 13F MERCK COM 58933Y105 1,261,380 -112,864 -8.21 80,842 -7.42 0.3670
2017-05-11 2017-03-31 13F MERCK COM 58933Y105 1,374,244 -209,175 -13.21 87,320 -6.33 0.3942
2017-02-13 2016-12-31 13F MERCK COM 58933Y105 1,583,419 -116,933 -6.88 93,216 -12.16 0.4374
2016-11-10 2016-09-30 13F MERCK COM 58933Y105 1,700,352 -147,540 -7.98 106,119 -0.32 0.4662
2016-08-11 2016-06-30 13F MERCK COM 58933Y105 1,847,892 -946,959 -33.88 106,457 -28.01 0.4743
2016-05-13 2016-03-31 13F MERCK COM 58933Y105 2,794,851 -1,185,880 -29.79 147,876 -29.67 0.6634
2016-02-12 2015-12-31 13F MERCK COM 58933Y105 3,980,731 -3,873,963 -49.32 210,262 -45.80 0.9188
2015-11-13 2015-09-30 13F MERCK COM 58933Y105 7,854,694 3,054,505 63.63 387,943 41.96 1.5906
2015-08-13 2015-06-30 13F MERCK COM 58933Y105 4,800,189 433,394 9.92 273,274 8.87 1.0939
2015-05-13 2015-03-31 13F MERCK COM 58933Y105 4,366,795 628,078 16.80 251,003 18.22 1.0344
2015-02-13 2014-12-31 13F MERCK COM 58933Y105 3,738,717 314,839 9.20 212,321 4.61 0.8517
2014-11-13 2014-09-30 13F MERCK COM 58933Y105 3,423,878 -378,729 -9.96 202,967 -7.73 0.8677
2014-08-13 2014-06-30 13F MERCK COM 58933Y105 3,802,607 225,409 6.30 219,981 8.32 0.9152
2014-05-13 2014-03-31 13F MERCK COM 58933Y105 3,577,198 1,477,455 70.36 203,078 93.24 0.8834
2014-02-13 2013-12-31 13F MERCK COM 58933Y105 2,099,743 -153,345 -6.81 105,092 -2.03 0.4706
2013-11-13 2013-09-30 13F MERCK COM 58933Y105 2,253,088 129,870 6.12 107,267 8.76 0.5284
2013-08-12 2013-06-30 13F MERCK COM 58933Y105 2,123,218 2,123,218 98,624 0.5239
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.