Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionHarbour Capital Advisors, LLC
Latest Disclosed Ownership14,454 shares
Latest Disclosed Value $ 1,631,712
Harbour Capital Advisors, LLC reports 7.60% increase in ownership of MRK / Merck & Co., Inc.

On April 29, 2026 - Harbour Capital Advisors, LLC filed a 13F-HR form disclosing ownership of 14,454 shares of Merck & Co., Inc. (MX:MRK) valued at $1,631,712 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 7, 2026 disclosing 13,433 shares of Merck & Co., Inc.. This represents a change in shares of 7.60% 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)
2026-04-29 2026-03-31 13F MERCK COM 58933Y105 14,454 1,021 7.60 1,632 14.14 0.3108
2026-01-07 2025-12-31 13F MERCK COM 58933Y105 13,433 0 0.00 1,430 21.51 0.2911
2025-10-09 2025-09-30 13F MERCK COM 58933Y105 13,433 -278 -2.03 1,177 4.16 0.2408
2025-07-11 2025-06-30 13F MERCK COM 58933Y105 13,711 -459 -3.24 1,130 -7.76 0.2380
2025-04-23 2025-03-31 13F MERCK COM 58933Y105 14,170 -18,839 -57.07 1,224 -62.59 0.3027
2025-01-13 2024-12-31 13F MERCK COM 58933Y105 33,009 -3,225 -8.90 3,273 -18.10 0.7296
2024-10-16 2024-09-30 13F MERCK COM 58933Y105 36,234 -30 -0.08 3,996 -13.86 0.9218
2024-07-12 2024-06-30 13F MERCK COM 58933Y105 36,264 60 0.17 4,638 -1.72 1.1004
2024-04-16 2024-03-31 13F MERCK COM 58933Y105 36,204 69 0.19 4,719 13.79 1.1688
2024-01-05 2023-12-31 13F MERCK COM 58933Y105 36,135 223 0.62 4,147 12.17 1.1373
2023-10-05 2023-09-30 13F MERCK COM 58933Y105 35,912 840 2.40 3,697 -7.78 1.1086
2023-07-10 2023-06-30 13F MERCK COM 58933Y105 35,072 -827 -2.30 4,010 4.87 1.1826
2023-04-19 2023-03-31 13F MERCK COM 58933Y105 35,899 1,894 5.57 3,823 1.16 1.1556
2023-01-13 2022-12-31 13F MERCK COM 58933Y105 34,005 -504 -1.46 3,779 21.04 1.2714
2022-10-19 2022-09-30 13F MERCK COM 58933Y105 34,509 -165 -0.48 3,122 -1.23 1.0827
2022-07-20 2022-06-30 13F MERCK COM 58933Y105 34,674 105 0.30 3,161 11.46 1.0305
2022-04-11 2022-03-31 13F MERCK & CO. COM 58933Y105 34,569 310 0.90 2,836 8.00 0.7759
2022-01-12 2021-12-31 13F MERCK COM 58933Y105 34,259 231 0.68 2,626 2.74 0.6458
2021-10-13 2021-09-30 13F MERCK COM 58933Y105 34,028 750 2.25 2,556 -1.24 0.6728
2021-07-14 2021-06-30 13F MERCK COM 58933Y105 33,278 573 1.75 2,588 2.66 0.6950
2021-04-12 2021-03-31 13F MERCK & CO. COM 58933Y105 32,705 425 1.32 2,521 83,933.33 0.7420
2021-01-12 2020-12-31 13F MERCK & CO. COM 58933Y105 32,280 676 2.14 3 -99.89 1.4925
2020-10-09 2020-09-30 13F MERCK & CO. COM 58933Y105 31,604 489 1.57 2,622 8.98 0.9585
2020-07-21 2020-06-30 13F MERCK & CO. COM 58933Y105 31,115 1,875 6.41 2,406 6.93 0.9752
2020-04-08 2020-03-31 13F MERCK & CO. COM 58933Y105 29,240 1,340 4.80 2,250 -11.35 1.1439
2020-01-22 2019-12-31 13F MERCK COM 58933Y105 27,900 420 1.53 2,538 9.73 0.9725
2019-10-30 2019-09-30 13F MERCK COM 58933Y105 27,480 2,460 9.83 2,313 10.25 0.9782
2019-07-10 2019-06-30 13F MERCK COM 58933Y105 25,020 365 1.48 2,098 2.29 0.8995
2019-04-24 2019-03-31 13F MERCK COM 58933Y105 24,655 290 1.19 2,051 10.15 0.9058
2019-01-23 2018-12-31 13F MERCK COM 58933Y105 24,365 215 0.89 1,862 8.70 0.9248
2018-11-07 2018-09-30 13F MERCK COM 58933Y105 24,150 618 2.63 1,713 20.38 0.6898
2018-07-11 2018-06-30 13F MERCK COM 58933Y105 23,532 3,450 17.18 1,423 30.07 0.6094
2018-04-18 2018-03-31 13F MERCK COM 58933Y105 20,082 10,646 112.82 1,094 106.03 0.4657
2018-01-24 2017-12-31 13F MERCK COM 58933Y105 9,436 -2,558 -21.33 531 -30.86 0.2204
2017-11-08 2017-09-30 13F MERCK COM 58933Y105 11,994 -115,801 -90.61 768 -61.48 0.3348
2017-07-27 2017-06-30 13F MERCK COM 58933Y105 127,795 125,801 6,308.98 1,994 1,482.54 0.0406
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 1,994 1,994 127 0.0578
2017-02-03 2016-12-31 13F MERCK & CO INC COM 58933Y105 0 -2,144 -100.00 0 -100.00
2016-11-09 2016-09-30 13F MERCK & CO INC COM 58933Y105 2,144 2,144 134 0.0839
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.