Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionWe Are One Seven, LLC
Latest Disclosed Ownership76,852 shares
Latest Disclosed Value $ 9,244,545
We Are One Seven, LLC reports 0.80% decrease in ownership of MRK / Merck & Co., Inc.

On May 14, 2026 - We Are One Seven, LLC filed a 13F-HR form disclosing ownership of 76,852 shares of Merck & Co., Inc. (MX:MRK) valued at $9,244,545 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 77,470 shares of Merck & Co., Inc.. This represents a change in shares of -0.80% 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 76,852 -618 -0.80 9,245 13.37 0.1857
2026-02-03 2025-12-31 13F MERCK COM 58933Y105 77,470 142 0.18 8,155 25.64 0.1663
2025-10-24 2025-09-30 13F MERCK COM 58933Y105 77,328 13,593 21.33 6,490 28.64 0.1499
2025-07-25 2025-06-30 13F MERCK COM 58933Y105 63,735 3,300 5.46 5,045 -6.99 0.1622
2025-05-08 2025-03-31 13F MERCK COM 58933Y105 60,435 -5,588 -8.46 5,425 -17.41 0.2104
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 66,023 -23,154 -25.96 6,568 -35.15 0.2511
2024-10-15 2024-09-30 13F MERCK COM 58933Y105 89,177 12,011 15.57 10,127 6.01 0.4376
2024-08-07 2024-06-30 13F MERCK COM 58933Y105 77,166 15,700 25.54 9,553 17.79 0.4529
2024-05-14 2024-03-31 13F MERCK COM 58933Y105 61,466 -3,685 -5.66 8,110 14.19 0.4215
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 65,151 3,853 6.29 7,103 12.55 0.4073
2023-11-03 2023-09-30 13F MERCK COM 58933Y105 61,298 752 1.24 6,311 -9.68 0.4853
2023-08-11 2023-06-30 13F MERCK COM 58933Y105 60,546 -23,648 -28.09 6,986 -22.01 0.6396
2023-05-08 2023-03-31 13F MERCK COM 58933Y105 84,194 33,334 65.54 8,957 58.76 0.5690
2023-01-25 2022-12-31 13F MERCK COM 58933Y105 50,860 7,983 18.62 5,643 44.33 0.5646
2022-11-14 2022-09-30 13F Merck COM 58933Y105 42,877 3,954 10.16 3,909 10.14 0.1515
2022-08-10 2022-06-30 13F MERCK & CO INC COM COM 58933Y105 38,923 -21,414 -35.49 3,549 -28.32 0.4894
2022-05-13 2022-03-31 13F MERCK & CO INC COM COM 58933Y105 60,337 2,460 4.25 4,951 11.61 0.5321
2022-02-09 2021-12-31 13F MERCK & CO INC COM COM 58933Y105 57,877 10,893 23.18 4,436 7.23 0.4601
2021-11-09 2021-09-30 13F MERCK & CO INC COM COM 58933Y105 46,984 12,765 37.30 4,137 55.47 0.5248
2021-07-29 2021-06-30 13F MERCK & CO INC COM COM 58933Y105 34,219 8,169 31.36 2,661 32.52 0.3719
2021-04-29 2021-03-31 13F MERCK & CO. INC COM COM 58933Y105 26,050 4,764 22.38 2,008 15.34 0.3448
2021-01-22 2020-12-31 13F MERCK & CO. INC COM COM 58933Y105 21,286 -427 -1.97 1,741 -3.33 0.3587
2020-10-30 2020-09-30 13F MERCK & CO. INC COM COM 58933Y105 21,713 -1,323 -5.74 1,801 1.12 0.4279
2020-08-12 2020-06-30 13F MERCK & CO. INC COM COM 58933Y105 23,036 -1,055 -4.38 1,781 -3.89 0.4628
2020-04-17 2020-03-31 13F MERCK & CO. INC COM COM 58933Y105 24,091 -900 -3.60 1,853 -18.44 0.6294
2020-01-16 2019-12-31 13F MERCK & CO INC COM COM 58933Y105 24,991 -1,817 -6.78 2,272 0.66 0.5937
2019-10-10 2019-09-30 13F MERCK & CO INC COM COM 58933Y105 26,808 1,636 6.50 2,257 6.97 0.6487
2019-07-16 2019-06-30 13F MERCK & CO INC COM COM 58933Y105 25,172 -698 -2.70 2,110 -1.91 0.6809
2019-04-09 2019-03-31 13F MERCK & CO INC COM COM 58933Y105 25,870 7,867 43.70 2,151 56.44 0.7010
2019-01-24 2018-12-31 13F MERCK & COMPANY COM 58933Y105 18,003 -1,221 -6.35 1,375 0.88 0.5894
2018-10-09 2018-09-30 13F MERCK & CO INC COM COM 58933Y105 19,224 441 2.35 1,363 33.24 0.6375
2018-05-15 2018-03-31 13F MERCK & CO INC. COM Total COM 58933Y105 18,783 1,621 9.45 1,023 5.90 0.4713
2018-02-16 2017-12-31 13F MERCK & CO INC. COM COM 58933Y105 17,162 17,162 966 0.4467
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.