Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionOrrstown Financial Services Inc
Latest Disclosed Ownership4,904 shares
Latest Disclosed Value $ 589,902
Orrstown Financial Services Inc reports 5.53% decrease in ownership of MRK / Merck & Co., Inc.

On April 8, 2026 - Orrstown Financial Services Inc filed a 13F-HR form disclosing ownership of 4,904 shares of Merck & Co., Inc. (MX:MRK) valued at $589,902 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 15, 2026 disclosing 5,191 shares of Merck & Co., Inc.. This represents a change in shares of -5.53% 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)
2026-04-08 2026-03-31 13F Merck Common Stock 58933Y105 4,904 -287 -5.53 590 7.88 0.0734
2026-01-15 2025-12-31 13F Merck Common Stock 58933Y105 5,191 -1,622 -23.81 546 -4.38 0.0911
2025-10-10 2025-09-30 13F Merck Common Stock 58933Y105 6,813 -673 -8.99 572 -3.55 0.0978
2025-07-11 2025-06-30 13F Merck Common Stock 58933Y105 7,486 -771 -9.34 593 -20.11 0.1248
2025-04-14 2025-03-31 13F Merck Common Stock 58933Y105 8,257 433 5.53 741 -4.76 0.1764
2025-01-23 2024-12-31 13F Merck Common Stock 58933Y105 7,824 -3,229 -29.21 778 -38.01 0.2089
2024-10-24 2024-09-30 13F Merck Common Stock 58933Y105 11,053 9,325 539.64 1,255 489.20 0.3708
2024-07-12 2024-06-30 13F Merck Common Stock 58933Y105 1,728 1,728 214 0.1129
2020-01-17 2019-12-31 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 0 -810 -100.00 0 -100.00
2019-10-01 2019-09-30 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 810 0 0.00 70 2.94 0.0939
2019-07-11 2019-06-30 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 810 50 6.58 68 7.94 0.0928
2019-04-04 2019-03-31 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 760 0 0.00 63 8.62 0.0883
2019-01-25 2018-12-31 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 760 0 0.00 58 7.41 0.0871
2018-10-23 2018-09-30 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 760 -455 -37.45 54 -27.03 0.0708
2018-07-23 2018-06-30 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 1,215 0 0.00 74 12.12 0.0922
2018-04-16 2018-03-31 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 1,215 260 27.23 66 22.22 0.0780
2018-01-16 2017-12-31 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 955 0 0.00 54 -11.48 0.0620
2017-10-12 2017-09-30 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 955 0 0.00 61 0.00 0.0681
2017-07-17 2017-06-30 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 955 0 0.00 61 0.00 0.0667
2017-04-12 2017-03-31 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 955 455 91.00 61 96.77 0.0614
2017-01-13 2016-12-31 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 500 0 0.00 31 0.00 0.0317
2016-10-12 2016-09-30 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 500 -176 -26.04 31 -20.51 0.0326
2016-07-20 2016-06-30 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 676 0 0.00 39 8.33 0.0420
2016-04-08 2016-03-31 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 676 676 0.00 36 0.0389
2016-01-22 2015-12-31 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 0 -200 -100.00 0 -100.00
2015-10-08 2015-09-30 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 200 0 0.00 10 -9.09 0.0117
2015-07-06 2015-06-30 13F MERCK & CO INC NEW COM EQUITY / LARGE CAP 58933Y105 200 200 11 0.0120
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.