Merck & Co., Inc.
DE ˙ XTRA ˙ US58933Y1055
102,78 € ↑2,84 (2,84%)
2026-06-04
PREZZO DELLE AZIONI
SecurityDE:6MK / Merck & Co., Inc.
InstitutionFox Run Management, L.l.c.
Latest Disclosed Ownership13,212 shares
Latest Disclosed Value $ 1,560,337
Fox Run Management, L.l.c. reports 136.60% increase in ownership of 6MK / Merck & Co., Inc.

On May 12, 2026 - Fox Run Management, L.l.c. filed a 13F-HR form disclosing ownership of 13,212 shares of Merck & Co., Inc. (DE:6MK) valued at $1,376,690 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 5,584 shares of Merck & Co., Inc.. This represents a change in shares of 136.60% during the quarter. The current value of the position is $1,357,929 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)
2026-05-12 2026-03-31 13F MERCK COM 58933Y105 13,212 7,628 136.60 1,560 165.76 0.2730
2026-02-11 2025-12-31 13F MERCK COM 58933Y105 5,584 5,584 588 0.0907
2025-11-12 2025-09-30 13F MERCK COM 58933Y105 0 -16,761 -100.00 0 -100.00
2025-08-06 2025-06-30 13F MERCK COM 58933Y105 16,761 8,725 108.57 1,327 83.91 0.2211
2025-05-13 2025-03-31 13F MERCK COM 58933Y105 8,036 8,036 721 0.1117
2025-02-11 2024-12-31 13F MERCK COM 58933Y105 0 -5,894 -100.00 0 -100.00
2024-11-12 2024-09-30 13F MERCK COM 58933Y105 5,894 -10,275 -63.55 669 -66.57 0.1489
2024-08-13 2024-06-30 13F MERCK COM 58933Y105 16,169 13,164 438.07 2,002 405.30 0.3767
2024-05-13 2024-03-31 13F MERCK COM 58933Y105 3,005 -2,933 -49.39 397 -38.79 0.0855
2024-02-13 2023-12-31 13F MERCK COM 58933Y105 5,938 5,938 647 0.1651
2022-05-10 2022-03-31 13F MERCK COM 58933Y105 0 -4,770 -100.00 0 -100.00
2022-02-09 2021-12-31 13F MERCK COM 58933Y105 4,770 4,770 366 0.2157
2020-02-14 2019-12-31 13F MERCK INC 58933Y105 0 -2,827 -100.00 0 -100.00
2019-10-15 2019-09-30 13F/A-1 MERCK INC 58933Y105 2,827 118 4.36 238 4.85 0.2166
2019-10-11 2019-09-30 13F MERCK COM 58933Y105 2,709 0 227
2019-07-17 2019-06-30 13F MERCK COM 58933Y105 2,709 2,709 -39.46 227 -33.63 0.1508
2019-10-17 2019-03-31 13F MERCK COM 58933Y105 0 -4,475 -100.00 0 -100.00
2019-01-15 2018-12-31 13F MERCK COM 58933Y105 4,475 -3,543 -44.19 342 -39.89 0.1812
2018-10-05 2018-09-30 13F MERCK COM 58933Y105 8,018 2,263 39.32 569 63.04 0.2480
2018-07-17 2018-06-30 13F MERCK INC 58933Y105 5,755 5,755 349 0.1107
2017-07-10 2017-06-30 13F MERCK COM 58933Y105 0 -17,000 -100.00 0 -100.00
2017-04-17 2017-03-31 13F MERCK COM 58933Y105 17,000 5,200 44.07 1,080 55.40 0.4406
2017-01-10 2016-12-31 13F MERCK INC 58933Y105 11,800 7,800 195.00 695 178.00 0.3653
2016-10-12 2016-09-30 13F MERCK INC 58933Y105 4,000 -900 -18.37 250 -11.35 0.1474
2016-07-18 2016-06-30 13F MERCK COM 58933Y105 4,900 4,900 0.00 282 0.1369
2016-04-18 2016-03-31 13F MERCK & CO INC COM 58933Y105 0 -8,900 -100.00 0 -100.00
2016-01-13 2015-12-31 13F MERCK & CO INC COM 58933Y105 8,900 8,900 470 0.3634
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.