Merck & Co., Inc.
DE ˙ XTRA ˙ US58933Y1055
102,78 € ↑2,84 (2,84%)
2026-06-04
AKTIENPREIS
SecurityDE:6MK / Merck & Co., Inc.
InstitutionProspera Financial Services Inc
Latest Disclosed Ownership105,561 shares
Latest Disclosed Value $ 12,705,606
Prospera Financial Services Inc reports 10.17% decrease in ownership of 6MK / Merck & Co., Inc.

On April 14, 2026 - Prospera Financial Services Inc filed a 13F-HR form disclosing ownership of 105,561 shares of Merck & Co., Inc. (DE:6MK) valued at $10,999,456 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 117,517 shares of Merck & Co., Inc.. This represents a change in shares of -10.17% during the quarter. The current value of the position is $10,849,560 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)
2026-04-14 2026-03-31 13F MERCK COM 58933Y105 105,561 -11,956 -10.17 12,706 2.66 0.2046
2026-02-09 2025-12-31 13F MERCK COM 58933Y105 117,517 6,991 6.33 12,377 33.36 0.2031
2025-11-06 2025-09-30 13F MERCK COM 58933Y105 110,526 8,096 7.90 9,281 14.40 0.1583
2025-08-06 2025-06-30 13F MERCK COM 58933Y105 102,430 -50,050 -32.82 8,112 -40.75 0.1511
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 152,480 20,878 15.86 13,690 4.53 0.3146
2025-02-13 2024-12-31 13F MERCK COM 58933Y105 131,602 -61,416 -31.82 13,098 -40.26 0.3051
2024-11-07 2024-09-30 13F MERCK COM 58933Y105 193,018 9,387 5.11 21,925 -3.58 0.5599
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 183,631 41,816 29.49 22,739 21.48 0.6323
2024-08-13 2024-03-31 13F MERCK COM 58933Y105 141,815 20,857 17.24 18,718 41.95 0.5576
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 120,958 9,359 8.39 13,187 14.74 0.4366
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 111,599 18,709 20.14 11,493 7.17 0.4444
2023-08-08 2023-06-30 13F MERCK COM 58933Y105 92,890 -7,478 -7.45 10,723 0.39 0.4104
2023-05-12 2023-03-31 13F MERCK COM 58933Y105 100,368 4,829 5.05 10,682 0.76 0.4390
2023-02-08 2022-12-31 13F MERCK COM 58933Y105 95,539 -43,084 -31.08 10,600 -11.23 0.5310
2022-10-27 2022-09-30 13F MERCK COM 58933Y105 138,623 14,102 11.32 11,941 5.13 0.6230
2022-08-08 2022-06-30 13F MERCK COM 58933Y105 124,521 35,477 39.84 11,358 55.42 0.5792
2022-05-04 2022-03-31 13F MERCK COM 58933Y105 89,044 26,638 42.68 7,308 52.73 0.3060
2022-02-10 2021-12-31 13F MERCK COM 58933Y105 62,406 3,571 6.07 4,785 8.26 0.2068
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 58,835 38 0.06 4,420 -3.37 0.2202
2021-08-16 2021-06-30 13F/A-1 MERCK COM 58933Y105 58,797 8,422 16.72 4,574 17.73 0.2293
2021-08-12 2021-06-30 13F MERCK COM 58933Y105 1,463,688 1,413,313 3,169 0.1631
2021-05-06 2021-03-31 13F MERCK & CO. COM 58933Y105 50,375 171 0.34 3,885 -5.47 0.2305
2021-02-12 2020-12-31 13F MERCK & CO. COM 58933Y105 50,204 17,168 51.97 4,110 50.00 0.2831
2020-11-04 2020-09-30 13F MERCK & CO. COM 58933Y105 33,036 -13,066 -28.34 2,740 -23.14 1.0472
2020-08-10 2020-06-30 13F MERCK & CO. COM 58933Y105 46,102 27,500 147.83 3,565 149.13 0.3159
2020-05-15 2020-03-31 13F MERCK & CO. COM 58933Y105 18,602 -28,821 -60.77 1,431 -66.82 0.1519
2020-02-12 2019-12-31 13F MERCK COM 58933Y105 47,423 27,196 134.45 4,313 153.26 0.3323
2019-10-22 2019-09-30 13F MERCK COM 58933Y105 20,227 1,268 6.69 1,703 6.64 0.1749
2019-08-14 2019-06-30 13F/A-1 MERCK COM 58933Y105 18,959 1,107 6.20 1,597 10.37 0.1793
2019-08-14 2019-06-30 13F MERCK COM 58933Y105 17,048 -804 1,302
2019-05-02 2019-03-31 13F MERCK COM 58933Y105 17,852 804 4.72 1,447 11.14 0.4763
2019-02-13 2018-12-31 13F MERCK COM 58933Y105 17,048 2,444 16.74 1,302 40.60 0.2627
2018-10-25 2018-09-30 13F MERCK COM 58933Y105 14,604 -1,669 -10.26 926 -6.65 0.1726
2018-07-18 2018-06-30 13F MERCK COM 58933Y105 16,273 1,220 8.10 992 20.83 0.1344
2018-04-12 2018-03-31 13F MERCK COM 58933Y105 15,053 5,497 57.52 821 52.04 0.1146
2018-01-23 2017-12-31 13F MERCK COM 58933Y105 9,556 -1,463 -13.28 540 -23.62 0.0825
2017-10-11 2017-09-30 13F MERCK COM 58933Y105 11,019 1,460 15.27 707 15.90 0.1075
2017-07-19 2017-06-30 13F MERCK COM 58933Y105 9,559 -2,682 -21.91 610 -21.59 0.0979
2017-04-13 2017-03-31 13F MERCK COM 58933Y105 12,241 966 8.57 778 16.47 0.1402
2017-01-11 2016-12-31 13F MERCK COM 58933Y105 11,275 630 5.92 668 0.60 0.1309
2016-10-12 2016-09-30 13F MERCK COM 58933Y105 10,645 3,904 57.91 664 71.13 0.1334
2016-07-26 2016-06-30 13F MERCK COM 58933Y105 6,741 228 3.50 388 12.46 0.0802
2016-04-12 2016-03-31 13F MERCK & CO INC COM 58933Y105 6,513 194 3.07 345 3.29 0.0768
2016-01-12 2015-12-31 13F MERCK & CO INC COM 58933Y105 6,319 -443 -6.55 334 11.33 0.0733
2015-10-16 2015-09-30 13F MERCK & CO INC COM 58933Y105 6,762 1,786 35.89 300 22.95 0.0759
2015-08-07 2015-06-30 13F MERCK & CO INC COM 58933Y105 4,976 803 19.24 244 22.00 0.0581
2015-04-22 2015-03-31 13F MERCK & CO INC COM 58933Y105 4,173 -432 -9.38 200 -23.66 0.0445
2015-01-14 2014-12-31 13F MERCK & CO INC COM 58933Y105 4,605 -1,464 -24.12 262 -17.87 0.0653
2014-10-16 2014-09-30 13F MERCK & CO INC COM 58933Y105 6,069 7 0.12 319 -9.12 0.0860
2014-07-07 2014-06-30 13F MERCK & CO INC COM 58933Y105 6,062 -191 -3.05 351 11.08 0.0950
2014-04-04 2014-03-31 13F MERCK & CO INC COM 58933Y105 6,253 -2,769 -30.69 316 -30.09 0.0998
2014-02-13 2013-12-31 13F MERCK & CO INC COM 58933Y105 9,022 -1,679 -15.69 452 -13.41 0.1520
2013-11-04 2013-09-30 13F MERCK & CO INC COM 58933Y105 10,701 2,400 28.91 522 35.94 0.1980
2013-08-15 2013-06-30 13F MERCK & CO INC COM 58933Y105 8,301 8,301 384 0.1778
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.