Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionARS Investment Partners, LLC
Latest Disclosed Ownership22,066 shares
Latest Disclosed Value $ 2,654,372
ARS Investment Partners, LLC reports 2.30% decrease in ownership of MRK / Merck & Co., Inc.

On April 16, 2026 - ARS Investment Partners, LLC filed a 13F-HR form disclosing ownership of 22,066 shares of Merck & Co., Inc. (MX:MRK) valued at $2,654,372 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 22,586 shares of Merck & Co., Inc.. This represents a change in shares of -2.30% 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)
2026-04-16 2026-03-31 13F MERCK COM 58933Y105 22,066 -520 -2.30 2,654 11.65 0.1380
2026-02-05 2025-12-31 13F MERCK COM 58933Y105 22,586 -2,933 -11.49 2,377 11.02 0.1389
2025-10-15 2025-09-30 13F MERCK COM 58933Y105 25,519 -3,047 -10.67 2,142 -5.31 0.1414
2025-08-11 2025-06-30 13F MERCK COM 58933Y105 28,566 -92,982 -76.50 2,261 -81.30 0.1649
2025-05-14 2025-03-31 13F MERCK COM 58933Y105 121,548 -1,385 -1.13 12,092 -1.13 1.0941
2025-01-16 2024-12-31 13F MERCK COM 58933Y105 122,933 1,141 0.94 12,229 -11.58 1.1019
2024-10-16 2024-09-30 13F MERCK COM 58933Y105 121,792 -638 -0.52 13,831 -8.75 1.2396
2024-07-17 2024-06-30 13F MERCK COM 58933Y105 122,430 -262 -0.21 15,157 -6.38 1.4495
2024-05-02 2024-03-31 13F MERCK COM 58933Y105 122,692 -165 -0.13 16,189 20.88 1.6131
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 122,857 4,731 4.01 13,394 10.13 1.4841
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 118,126 -434 -0.37 12,161 -11.10 1.5074
2023-07-11 2023-06-30 13F MERCK COM 58933Y105 118,560 -1,280 -1.07 13,681 7.30 1.5986
2023-04-05 2023-03-31 13F MERCK COM 58933Y105 119,840 633 0.53 12,750 -3.61 1.5308
2023-01-25 2022-12-31 13F MERCK COM 58933Y105 119,207 -13,989 -10.50 13,226 15.30 1.7594
2022-10-07 2022-09-30 13F MERCK COM 58933Y105 133,196 13,837 11.59 11,471 5.41 1.5773
2022-07-15 2022-06-30 13F MERCK COM 58933Y105 119,359 -599 -0.50 10,882 10.56 1.4866
2022-05-16 2022-03-31 13F MERCK COM 58933Y105 119,958 76 0.06 9,843 7.13 0.9490
2022-02-11 2021-12-31 13F MERCK COM 58933Y105 119,882 3,102 2.66 9,188 4.75 0.8439
2021-11-05 2021-09-30 13F MERCK COM 58933Y105 116,780 -773 -0.66 8,771 -4.06 0.8777
2021-08-06 2021-06-30 13F MERCK COM 58933Y105 117,553 -721 -0.61 9,142 0.26 0.9318
2021-05-13 2021-03-31 13F MERCK & CO. COM 58933Y105 118,274 -1,612 -1.34 9,118 -7.03 1.0591
2021-02-09 2020-12-31 13F MERCK & CO. COM 58933Y105 119,886 -608 -0.50 9,807 -1.88 1.2072
2020-11-12 2020-09-30 13F MERCK & CO. COM 58933Y105 120,494 -308 -0.25 9,995 6.99 1.5711
2020-08-13 2020-06-30 13F MERCK & CO. COM 58933Y105 120,802 15,192 14.39 9,342 14.96 1.7582
2020-05-12 2020-03-31 13F MERCK & CO. COM 58933Y105 105,610 -651 -0.61 8,126 -15.91 1.9619
2020-02-12 2019-12-31 13F MERCK COM 58933Y105 106,261 -629 -0.59 9,664 7.40 1.6243
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 106,890 -14,692 -12.08 8,998 -11.74 1.6165
2019-08-12 2019-06-30 13F MERCK COM 58933Y105 121,582 13,180 12.16 10,195 13.08 1.7136
2019-05-09 2019-03-31 13F MERCK COM 58933Y105 108,402 -2,209 -2.00 9,016 6.67 1.6319
2019-02-13 2018-12-31 13F MERCK COM 58933Y105 110,611 -394 -0.35 8,452 7.33 1.7886
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 111,005 82,435 288.54 7,875 354.15 1.2199
2018-11-13 2018-06-30 13F/A-1 MERCK COM 58933Y105 28,570 28,570 1,734 0.2767
2018-08-13 2018-06-30 13F MERCK COM 58933Y105 28,570 28,570 1,734
2016-08-10 2016-06-30 13F Merck COM 58933Y105 0 -5,561 -100.00 0 -100.00
2016-05-11 2016-03-31 13F Merck COM 58933Y105 5,561 423 8.23 294 8.49 0.0689
2016-02-16 2015-12-31 13F Merck COM 58933Y105 5,138 -627 -10.88 271 -4.91 0.0636
2015-11-13 2015-09-30 13F Merck COM 58933Y105 5,765 -220,726 -97.45 285 -97.79 0.0653
2015-08-11 2015-06-30 13F Merck COM 58933Y105 226,491 -7,537 -3.22 12,894 -4.15 2.3584
2015-05-13 2015-03-31 13F Merck COM 58933Y105 234,028 -15,236 -6.11 13,452 -4.97 2.4991
2015-02-13 2014-12-31 13F Merck COM 58933Y105 249,264 -6,419 -2.51 14,156 -6.60 2.4067
2014-11-12 2014-09-30 13F Merck COM 58933Y105 255,683 123,937 94.07 15,157 98.86 2.3092
2014-07-30 2014-06-30 13F Merck COM 58933Y105 131,746 -2,502 -1.86 7,622 0.01 1.1802
2014-05-13 2014-03-31 13F Merck COM 58933Y105 134,248 -972 -0.72 7,621 12.60 1.3436
2014-02-11 2013-12-31 13F Merck COM 58933Y105 135,220 -12,862 -8.69 6,768 -4.00 1.1363
2013-11-08 2013-09-30 13F Merck COM 58933Y105 148,082 -4,390 -2.88 7,050 -0.45 1.2019
2013-08-14 2013-06-30 13F Merk COM 58933Y105 152,472 152,472 7,082 1.2449
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.