Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionCurbstone Financial Management Corp
Latest Disclosed Ownership24,064 shares
Latest Disclosed Value $ 2,894,659
Curbstone Financial Management Corp reports 0.84% increase in ownership of MRK / Merck & Co., Inc.

On April 15, 2026 - Curbstone Financial Management Corp filed a 13F-HR form disclosing ownership of 24,064 shares of Merck & Co., Inc. (MX:MRK) valued at $2,894,659 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 23,864 shares of Merck & Co., Inc.. This represents a change in shares of 0.84% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-15 2026-03-31 13F Merck & Co COM 58933Y105 24,064 200 0.84 2,895 15.25 0.5539
2026-01-23 2025-12-31 13F Merck & Co COM 58933Y105 23,864 20 0.08 2,512 25.49 0.4806
2025-10-15 2025-09-30 13F Merck & Co COM 58933Y105 23,844 232 0.98 2,001 7.06 0.3847
2025-07-29 2025-06-30 13F Merck & Co COM 58933Y105 23,612 -2,339 -9.01 1,869 -19.75 0.3835
2025-04-15 2025-03-31 13F Merck & Co COM 58933Y105 25,951 1,949 8.12 2,329 -2.43 0.4910
2025-01-22 2024-12-31 13F Merck & Co Inc. COM 589331107 24,002 456 1.94 2,388 -10.70 0.5057
2024-10-03 2024-09-30 13F Merck & Co Inc. COM 589331107 23,546 522 2.27 2,674 -6.21 0.5720
2024-07-03 2024-06-30 13F Merck & Co Inc. COM 589331107 23,024 -1,448 -5.92 2,850 -11.74 0.6191
2024-04-09 2024-03-31 13F Merck & Co Inc. COM 589331107 24,472 -550 -2.20 3,229 18.41 0.6976
2024-01-08 2023-12-31 13F Merck & Co Inc. COM 589331107 25,022 -14 -0.06 2,728 5.82 0.6192
2023-10-10 2023-09-30 13F Merck & Co Inc. COM 589331107 25,036 -600 -2.34 2,577 -12.88 0.6375
2023-07-05 2023-06-30 13F Merck & Co Inc. COM 589331107 25,636 -950 -3.57 2,958 4.60 0.7051
2023-05-12 2023-03-31 13F Merck & Co Inc. COM 589331107 26,586 -1,000 -3.63 2,828 94,166.67 0.6882
2023-01-19 2022-12-31 13F Merck & Co Inc. COM 589331107 27,586 -2,100 -7.07 3 -99.88 0.7657
2022-10-05 2022-09-30 13F Merck & Co Inc. COM 589331107 29,686 104 0.35 2,557 -5.19 0.6358
2022-08-04 2022-06-30 13F Merck & Co Inc. COM 589331107 29,582 1,550 5.53 2,697 17.26 0.6273
2022-04-18 2022-03-31 13F Merck & Co Inc. COM 589331107 28,032 130 0.47 2,300 7.58 0.4243
2022-01-19 2021-12-31 13F Merck & Co Inc. COM 589331107 27,902 130 0.47 2,138 2.49 0.3780
2021-10-06 2021-09-30 13F Merck & Co Inc. COM 589331107 27,772 408 1.49 2,086 -1.97 0.3933
2021-07-09 2021-06-30 13F Merck & Co Inc. COM 589331107 27,364 772 2.90 2,128 3.80 0.3998
2021-04-05 2021-03-31 13F Merck & Co Inc. COM 589331107 26,592 330 1.26 2,050 -4.56 0.4089
2021-01-14 2020-12-31 13F Merck & Co Inc. COM 589331107 26,262 4,068 18.33 2,148 16.68 0.4484
2020-10-02 2020-09-30 13F Merck & Co Inc. COM 589331107 22,194 750 3.50 1,841 11.04 0.4402
2020-07-10 2020-06-30 13F Merck & Co Inc. COM 589331107 21,444 1,100 5.41 1,658 5.94 0.4293
2020-04-20 2020-03-31 13F Merck & Co Inc. COM 589331107 20,344 180 0.89 1,565 -14.67 0.4727
2020-01-10 2019-12-31 13F Merck & Co Inc. COM 589331107 20,164 90 0.45 1,834 8.52 0.4366
2019-10-18 2019-09-30 13F Merck & Co Inc. COM 589331107 20,074 0 0.00 1,690 0.42 0.4340
2019-07-09 2019-06-30 13F Merck & Co Inc. COM 589331107 20,074 1,874 10.30 1,683 11.16 0.4422
2019-04-10 2019-03-31 13F Merck & Co Inc. COM 589331107 18,200 -80 -0.44 1,514 8.38 0.4121
2019-01-09 2018-12-31 13F/A-1 Merck & Co Inc. COM 589331107 18,280 300 1.67 1,397 9.48 0.4181
2019-01-08 2018-12-31 13F Merck & Co Inc. COM 589331107 17,490 -490 1,062
2018-10-10 2018-09-30 13F Merck & Co Inc. COM 589331107 17,980 490 2.80 1,276 20.15 0.3334
2018-07-06 2018-06-30 13F Merck & Co Inc. COM 589331107 17,490 0 0.00 1,062 11.44 0.2934
2018-04-10 2018-03-31 13F Merck & Co Inc. COM 589331107 17,490 8,645 97.74 953 91.37 0.2696
2018-01-08 2017-12-31 13F Merck & Co Inc. COM 589331107 8,845 -10,145 -53.42 498 -59.05 0.2750
2017-10-03 2017-09-30 13F Merck & Co Inc. COM 589331107 18,990 8,935 88.86 1,216 88.82 0.3521
2017-07-07 2017-06-30 13F Merck & Co Inc. COM 589331107 10,055 -300 -2.90 644 -2.13 0.3870
2017-04-05 2017-03-31 13F Merck & Co Inc. COM 589331107 10,355 -115 -1.10 658 6.82 0.4033
2017-01-10 2016-12-31 13F Merck & Co Inc. COM 589331107 10,470 -10,220 -49.40 616 -52.29 0.3883
2016-10-05 2016-09-30 13F Merck & Co Inc. COM 589331107 20,690 432 2.13 1,291 10.63 0.4141
2016-07-07 2016-06-30 13F Merck & Co Inc. COM 589331107 20,258 -300 -1.46 1,167 7.26 0.3909
2016-04-05 2016-03-31 13F Merck & Co Inc. COM 589331107 20,558 500 2.49 1,088 2.74 0.3655
2016-01-07 2015-12-31 13F Merck & Co Inc. COM 589331107 20,058 9,579 91.41 1,059 104.44 0.3621
2015-10-06 2015-09-30 13F Merck & Co Inc. COM 589331107 10,479 -776 -6.89 518 -19.19 0.3755
2015-07-14 2015-06-30 13F Merck & Co Inc. COM 589331107 11,255 -200 -1.75 641 -2.58 0.4263
2015-04-16 2015-03-31 13F Merck & Co Inc. COM 589331107 11,455 -450 -3.78 658 -2.66 0.4432
2015-01-23 2014-12-31 13F Merck & Co Inc. COM 589331107 11,905 450 3.93 676 -0.44 0.5204
2014-10-21 2014-09-30 13F Merck & Co Inc. COM 589331107 11,455 -475 -3.98 679 -1.59 0.5347
2014-07-25 2014-06-30 13F Merck & Co Inc. COM 589331107 11,930 0 0.00 690 1.92 0.5285
2014-05-15 2014-03-31 13F Merck COM 589331107 11,930 11,930 677 0.5526
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.