Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionMarathon Capital Management
Latest Disclosed Ownership23,685 shares
Latest Disclosed Value $ 2,849,069
Marathon Capital Management reports 29.65% decrease in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - Marathon Capital Management filed a 13F-HR form disclosing ownership of 23,685 shares of Merck & Co., Inc. (MX:MRK) valued at $2,849,069 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 33,665 shares of Merck & Co., Inc.. This represents a change in shares of -29.65% 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.

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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)
2026-05-14 2026-03-31 13F MERCK COM 58933Y105 23,685 -9,980 -29.65 2,849 -19.59 0.6399
2026-01-29 2025-12-31 13F MERCK COM 58933Y105 33,665 -487 -1.43 3,544 23.62 0.7626
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 34,152 -375 -1.09 2,866 4.87 0.6559
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 34,527 -482 -1.38 2,733 -13.02 0.6961
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 35,009 2,895 9.01 3,142 -1.63 0.8369
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 32,114 150 0.47 3,195 -11.99 0.7979
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 31,964 -100 -0.31 3,630 -8.57 0.8800
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 32,064 -240 -0.74 3,970 -6.87 1.0116
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 32,304 -400 -1.22 4,262 19.55 1.0171
2024-02-14 2023-12-31 13F/A-1 MERCK COM 58933Y105 32,704 -375 -1.13 3,565 4.70 0.8962
2024-02-08 2023-12-31 13F MERCK COM 58933Y105 32,704 -375 3,565 0.8962
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 33,079 -555 -1.65 3,405 -12.26 0.8570
2023-08-15 2023-06-30 13F/A-1 MERCK COM 58933Y105 33,634 -850 -2.46 3,881 5.81 0.9580
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 33,634 -850 3,881 0.9401
2023-05-12 2023-03-31 13F MERCK COM 58933Y105 34,484 -11,261 -24.62 3,669 -27.72 0.9028
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 45,745 -820 -1.76 5,075 26.56 1.3990
2022-11-14 2022-09-30 13F Merck COM 58933Y105 46,565 -69 -0.15 4,010 -5.69 1.1456
2022-08-12 2022-06-30 13F Merck COM 58933Y105 46,634 40 0.09 4,252 11.22 1.3736
2022-05-13 2022-03-31 13F Merck COM 58933Y105 46,594 505 1.10 3,823 8.24 1.0974
2022-02-09 2021-12-31 13F Merck COM 58933Y105 46,089 -3,386 -6.84 3,532 -4.98 0.8277
2021-11-15 2021-09-30 13F Merck COM 58933Y105 49,475 2,171 4.59 3,717 1.06 0.8438
2021-08-16 2021-06-30 13F Merck COM 58933Y105 47,304 34,115 258.66 3,678 262.01 0.8515
2021-05-14 2021-03-31 13F Merck COM 58933Y105 13,189 925 7.54 1,016 1.30 0.2678
2021-02-08 2020-12-31 13F Merck COM 58933Y105 12,264 0 0.00 1,003 -1.38 0.2956
2020-11-16 2020-09-30 13F Merck COM 58933Y105 12,264 -396 -3.13 1,017 3.88 0.3702
2020-08-14 2020-06-30 13F Merck COM 58933Y105 12,660 -60 -0.47 979 0.10 0.3760
2020-05-15 2020-03-31 13F Merck COM 58933Y105 12,720 -648 -4.85 978 -19.51 0.4490
2020-02-14 2019-12-31 13F Merck COM 58933Y105 13,368 2,712 25.45 1,215 35.45 0.4132
2019-11-13 2019-09-30 13F Merck COM 58933Y105 10,656 -7 -0.07 897 0.34 0.3618
2019-07-25 2019-06-30 13F Merck COM 58933Y105 10,663 -115 -1.07 894 -0.22 0.3646
2019-05-15 2019-03-31 13F Merck COM 58933Y105 10,778 -579 -5.10 896 3.34 0.4002
2019-02-07 2018-12-31 13F Merck COM 58933Y105 11,357 -1,425 -11.15 867 28.25 0.4304
2016-05-13 2016-03-31 13F Merck EQ 589331107 12,782 -1,406 -9.91 676 -9.75 0.3499
2016-02-12 2015-12-31 13F Merck EQ 589331107 14,188 -62 -0.44 749 6.39 0.3966
2015-11-12 2015-09-30 13F Merck COM 589331107 14,250 352 2.53 704 -11.00 0.3575
2015-08-11 2015-06-30 13F Merck COM 589331107 13,898 -213 -1.51 791 -2.47 0.3647
2015-05-06 2015-03-31 13F Merck COM 589331107 14,111 550 4.06 811 5.32 0.3595
2015-02-09 2014-12-31 13F Merck COM 589331107 13,561 0 0.00 770 -4.23 0.7095
2014-10-30 2014-09-30 13F Merck COM 589331107 13,561 -850 -5.90 804 -3.60 0.7244
2014-08-08 2014-06-30 13F Merck COM 589331107 14,411 -375 -2.54 834 -0.60 0.6709
2014-04-30 2014-03-31 13F Merck COM 589331107 14,786 -550 -3.59 839 9.24 0.6304
2014-01-28 2013-12-31 13F Merck COM 589331107 15,336 0 0.00 768 5.21 0.5540
2013-11-04 2013-09-30 13F Merck COM 589331107 15,336 -1,437 -8.57 730 -6.29 0.6271
2013-07-25 2013-06-30 13F Merck COM 589331107 16,773 16,773 779 0.6649
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.