Sector Gamma As reports 28.41% decrease in ownership of MRK / Merck & Co., Inc.

머크 앤 컴퍼니(Merck & Co., Inc.)

MX ˙ BMV ˙ US58933Y1055

Security	MX:MRK / Merck & Co., Inc.
Institution	Sector Gamma As
Latest Disclosed Ownership	260,340 shares
Latest Disclosed Value	$ 31,316,299

On May 7, 2026 - Sector Gamma As filed a 13F-HR form disclosing ownership of 260,340 shares of Merck & Co., Inc. (MX:MRK) valued at $31,316,299 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 363,651 shares of Merck & Co., Inc.. This represents a change in shares of -28.41% 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	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-07	2026-03-31	13F	MERCK	COM	58933Y105	260,340	-103,311	-28.41	31,316	-18.19	7.3948
2026-02-12	2025-12-31	13F	MERCK	COM	58933Y105	363,651	41,151	12.76	38,278	41.42	8.7250
2025-10-31	2025-09-30	13F	MERCK	COM	58933Y105	322,500	120,500	59.65	27,067	69.27	6.7112
2025-07-31	2025-06-30	13F	MERCK	COM	58933Y105	202,000	202,000		15,990		5.2265
2023-08-09	2023-06-30	13F	MERCK	COM	58933Y105	0	-56,153	-100.00	0	-100.00
2023-05-12	2023-03-31	13F	MERCK	COM	58933Y105	56,153	-143,147	-71.82	5,974	-72.98	1.4483
2023-02-08	2022-12-31	13F/A-1	MERCK	COM	58933Y105	199,300	-53,859	-21.27	22,112	1.42	5.0554
2023-02-07	2022-12-31	13F	MERCK	COM	58933Y105	199,300	-53,859		22		5.0553
2022-11-09	2022-09-30	13F	MERCK	COM	58933Y105	253,159	-161,179	-38.90	21,802	-42.28	5.6187
2022-08-05	2022-06-30	13F	MERCK	COM	58933Y105	414,338	-84,803	-16.99	37,775	-7.76	8.4517
2022-05-06	2022-03-31	13F	MERCK	COM	58933Y105	499,141	23,337	4.90	40,955	12.31	8.8992
2022-02-08	2021-12-31	13F	MERCK	COM	58933Y105	475,804	-337,010	-41.46	36,466	-40.27	8.5718
2021-10-29	2021-09-30	13F	MERCK	COM	58933Y105	812,814	357,367	78.47	61,050	72.36	12.1786
2021-08-04	2021-06-30	13F	MERCK & CO.	COM	58933Y105	455,447	-50,729	-10.02	35,420	-9.23	6.2733
2021-05-10	2021-03-31	13F	MERCK & CO.	COM	58933Y105	506,176	-72,035	-12.46	39,021	-17.50	7.1467
2021-02-10	2020-12-31	13F	MERCK	COM	58933Y105	578,211	184,837	46.99	47,298	44.95	9.0008
2020-11-09	2020-09-30	13F	MERCK	COM	58933Y105	393,374	-8,221	-2.05	32,630	5.07	7.4268
2020-08-07	2020-06-30	13F	MERCK	COM	58933Y105	401,595	28,900	7.75	31,055	8.30	6.4105
2020-05-11	2020-03-31	13F	MERCK	COM	58933Y105	372,695	17,900	5.05	28,675	-11.14	6.1139
2020-02-12	2019-12-31	13F	MERCK	COM	58933Y105	354,795	354,795		32,269		5.1680
2019-07-31	2019-06-30	13F	MERCK	COM	58933Y105	0	-119,352	-100.00	0	-100.00
2019-05-13	2019-03-31	13F	MERCK	COM	58933Y105	119,352	-341,694	-74.11	9,927	-71.82	1.5920
2019-02-12	2018-12-31	13F	MERCK	COM	58933Y105	461,046	-270,000	-36.93	35,229	-32.07	5.9235
2018-11-15	2018-09-30	13F/A-1	MERCK	COM	58933Y105	731,046	-182,784	-20.00	51,860	-6.51	8.1310
2018-11-08	2018-09-30	13F	MERCK	COM	58933Y105	420,406	-493,424		29,824
2018-08-02	2018-06-30	13F	MERCK	COM	58933Y105	913,830	188,630	26.01	55,469	40.42	9.2187
2018-05-09	2018-03-31	13F	MERCK	COM	58933Y105	725,200	166,700	29.85	39,502	25.69	7.1193
2018-02-12	2017-12-31	13F	MERCK	COM	58933Y105	558,500	558,500		31,427		5.2824
2017-06-09	2017-03-31	13F/A-1	MERCK & CO INC	COM	58933Y105	0	-283,410	-100.00	0	-100.00
2017-02-14	2016-12-31	13F	MERCK & CO INC	COM	58933Y105	283,410	-34,600	-10.88	16,684	-12.64	3.1389
2016-11-08	2016-09-30	13F	MERCK & CO INC	COM	58933Y105	318,010	70,360	28.41	19,097	33.85	3.5772
2016-08-11	2016-06-30	13F	MERCK & CO INC	COM	58933Y105	247,650	-186,510	-42.96	14,267	-37.89	2.8872
2016-05-27	2016-03-31	13F	MERCK & CO INC	COM	58933Y105	434,160	434,160		22,971		4.8119

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.