Merck & Co., Inc.
DE ˙ XTRA ˙ US58933Y1055
102,78 € ↑2,84 (2,84%)
2026-06-04
AKTIENPREIS
SecurityDE:6MK / Merck & Co., Inc.
InstitutionWestpac Banking Corp
Latest Disclosed Ownership35,819 shares
Latest Disclosed Value $ 4,308,668
Westpac Banking Corp reports 38.33% decrease in ownership of 6MK / Merck & Co., Inc.

On May 11, 2026 - Westpac Banking Corp filed a 13F-HR form disclosing ownership of 35,819 shares of Merck & Co., Inc. (DE:6MK) valued at $3,732,340 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 58,082 shares of Merck & Co., Inc.. This represents a change in shares of -38.33% during the quarter. The current value of the position is $3,681,477 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)
2026-05-11 2026-03-31 13F MERCK COM 58933Y105 35,819 -22,263 -38.33 4,309 -29.53 0.1501
2026-02-10 2025-12-31 13F MERCK COM 58933Y105 58,082 -63,983 -52.42 6,114 -40.33 0.3862
2025-11-14 2025-09-30 13F/A-1 MERCK & CO INC USD 0.5 COM 58933Y105 122,065 1,489 1.23 10,245 7.33 0.6349
2025-11-12 2025-09-30 13F MERCK & CO INC USD 0.5 COM 58933Y105 122,065 1,489 10,245 0.2571
2025-08-11 2025-06-30 13F MERCK COM 58933Y105 120,576 3,253 2.77 9,545 -9.36 0.6381
2025-05-13 2025-03-31 13F MERCK COM 58933Y105 117,323 -5,912 -4.80 10,531 -14.10 0.7748
2025-02-12 2024-12-31 13F MERCK COM 58933Y105 123,235 20,491 19.94 12,259 5.07 0.8135
2024-11-08 2024-09-30 13F MERCK COM 58933Y105 102,744 12,644 14.03 11,668 4.60 0.7822
2024-08-14 2024-06-30 13F/A-1 MERCK COM 58933Y105 90,100 637 0.71 11,154 -5.51 0.8846
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 248 -89,215 11,154 0.3835
2024-05-09 2024-03-31 13F MERCK COM 58933Y105 89,463 -14,795 -14.19 11,805 3.85 0.8994
2024-02-08 2023-12-31 13F MERCK COM 58933Y105 104,258 -19,270 -15.60 11,366 -10.62 0.9370
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 123,528 12,628 11.39 12,717 -0.62 0.9516
2023-08-10 2023-06-30 13F MERCK COM 58933Y105 110,900 -323,725 -74.48 12,797 -72.33 0.9030
2023-05-04 2023-03-31 13F MERCK COM 58933Y105 434,625 -47,983 -9.94 46,240 -13.64 0.6216
2023-02-06 2022-12-31 13F MERCK COM 58933Y105 482,608 76,911 18.96 53,545 53.26 0.7915
2022-11-08 2022-09-30 13F MERCK COM 58933Y105 405,697 17,888 4.61 34,939 -1.18 0.5326
2022-08-10 2022-06-30 13F MERCK COM 58933Y105 387,809 36,953 10.53 35,357 22.82 0.4606
2022-05-11 2022-03-31 13F MERCK & CO. COM 58933Y105 350,856 -16,248 -4.43 28,788 2.32 0.3303
2022-02-08 2021-12-31 13F MERCK COM 58933Y105 367,104 -13,632 -3.58 28,135 -1.62 0.2915
2021-10-27 2021-09-30 13F MERCK COM 58933Y105 380,736 -7,643 -1.97 28,597 -5.32 0.3057
2021-08-11 2021-06-30 13F MERCK COM 58933Y105 388,379 -12,863 -3.21 30,204 -2.35 0.3033
2021-05-13 2021-03-31 13F MERCK & CO. COM 58933Y105 401,242 10,300 2.63 30,932 -3.28 0.3413
2021-02-11 2020-12-31 13F MERCK & CO. COM 58933Y105 390,942 12,205 3.22 31,979 1.79 0.3629
2020-11-10 2020-09-30 13F MERCK & CO. COM 58933Y105 378,737 5,482 1.47 31,416 8.85 0.4257
2020-08-12 2020-06-30 13F MERCK & CO. COM 58933Y105 373,255 -21,611 -5.47 28,864 -4.99 0.4302
2020-05-14 2020-03-31 13F MERCK & CO. COM 58933Y105 394,866 7,943 2.05 30,381 -13.67 0.5235
2020-02-11 2019-12-31 13F MERCK COM 58933Y105 386,923 32,849 9.28 35,191 18.07 0.4530
2019-11-13 2019-09-30 13F MERCK COM 58933Y105 354,074 -20,608 -5.50 29,806 -5.13 0.4144
2019-08-01 2019-06-30 13F MERCK COM 58933Y105 374,682 18,837 5.29 31,417 6.16 0.4798
2019-05-14 2019-03-31 13F MERCK COM 58933Y105 355,845 -1,123 -0.31 29,596 8.51 0.4886
2019-02-07 2018-12-31 13F MERCK COM 58933Y105 356,968 14,882 4.35 27,276 12.40 0.4648
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 342,086 -1,200 -0.35 24,268 16.46 0.4161
2018-07-18 2018-06-30 13F MERCK COM 58933Y105 343,286 -1,829 -0.53 20,837 10.85 0.4004
2018-05-01 2018-03-31 13F MERCK COM 58933Y105 345,115 82,747 31.54 18,798 27.33 0.3754
2018-01-18 2017-12-31 13F MERCK COM 58933Y105 262,368 7,255 2.84 14,763 -9.62 0.3355
2017-10-30 2017-09-30 13F MERCK COM 58933Y105 255,113 -6,284 -2.40 16,335 -2.50 0.3596
2017-08-09 2017-06-30 13F MERCK COM 58933Y105 261,397 -519,570 -66.53 16,753 -66.24 0.3688
2017-05-18 2017-03-31 13F/A-1 MERCK COM 58933Y105 780,967 250,814 47.31 49,623 29.45 0.3977
2017-05-11 2017-03-31 13F MERCK COM 58933Y105 509,831 30,809
2017-02-09 2016-12-31 13F MERCK COM 58933Y105 530,153 36,695 7.44 38,334 40.85 0.3615
2016-11-10 2016-09-30 13F MERCK COM 58933Y105 493,458 -74,253 -13.08 27,216 -0.58 0.2940
2016-08-10 2016-06-30 13F MERCK COM 58933Y105 567,711 -28,398 -4.76 27,374 -2.52 0.2997
2016-05-13 2016-03-31 13F MERCK & CO INC COM 58933Y105 596,109 -84,773 -12.45 28,081 -21.92 0.3053
2016-02-11 2015-12-31 13F MERCK & CO INC COM 58933Y105 680,882 -181,786 -21.07 35,964 -15.59 0.3979
2015-11-16 2015-09-30 13F/A-1 MERCK & CO INC COM 58933Y105 862,668 -139,882 -13.95 42,607 -25.35 0.4689
2015-11-12 2015-09-30 13F MERCK & CO INC COM 58933Y105 862,668 42,607
2015-08-12 2015-06-30 13F MERCK & CO INC COM 58933Y105 1,002,550 -218,927 -17.92 57,075 -30.59 0.5582
2015-05-12 2015-03-31 13F MERCK & CO INC COM 58933Y105 1,221,477 -269,240 -18.06 82,229 -2.87 0.7144
2015-02-11 2014-12-31 13F MERCK & CO INC COM 58933Y105 1,490,717 222,368 17.53 84,658 12.60 0.8054
2014-11-12 2014-09-30 13F MERCK & CO INC COM 58933Y105 1,268,349 244,064 23.83 75,188 26.89 0.7328
2014-08-11 2014-06-30 13F MERCK & CO INC COM 58933Y105 1,024,285 166,070 19.35 59,255 21.62 0.5709
2014-05-12 2014-03-31 13F MERCK & CO INC COM 58933Y105 858,215 276,743 47.59 48,721 67.40 0.5189
2014-02-13 2013-12-31 13F MERCK & CO INC COM 58933Y105 581,472 -126,239 -17.84 29,104 -13.61 0.3330
2013-11-12 2013-09-30 13F MERCK & CO INC COM 58933Y105 707,711 -438,347 -38.25 33,691 -35.02 0.4212
2013-08-14 2013-06-30 13F MERCK & CO INC COM 58933Y105 1,146,058 1,146,058 51,845 0.7925
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.