Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionMontecito Bank & Trust
Latest Disclosed Ownership21,682 shares
Latest Disclosed Value $ 2,608,128
Montecito Bank & Trust reports 4.64% decrease in ownership of MRK / Merck & Co., Inc.

On April 16, 2026 - Montecito Bank & Trust filed a 13F-HR form disclosing ownership of 21,682 shares of Merck & Co., Inc. (MX:MRK) valued at $2,608,128 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 9, 2026 disclosing 22,736 shares of Merck & Co., Inc.. This represents a change in shares of -4.64% 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)
2026-04-16 2026-03-31 13F MERCK Equities 58933Y105 21,682 -1,054 -4.64 2,608 8.98 0.3868
2026-01-09 2025-12-31 13F MERCK Equities 58933Y105 22,736 -4,593 -16.81 2,393 4.36 0.3815
2025-10-07 2025-09-30 13F MERCK Equities 58933Y105 27,329 -2,587 -8.65 2,294 -14.60 0.3562
2025-04-17 2025-03-31 13F MERCK Equities 58933Y105 29,916 324 1.09 2,685 -8.77 0.4753
2025-01-21 2024-12-31 13F MERCK Equities 58933Y105 29,592 2,386 8.77 2,944 -4.73 0.5098
2024-10-31 2024-09-30 13F MERCK Equities 58933Y105 27,206 5,302 24.21 3,090 13.94 0.5263
2024-07-17 2024-06-30 13F MERCK Com 58933Y105 21,904 1,084 5.21 2,712 -1.31 0.5517
2024-04-09 2024-03-31 13F MERCK Com 58933Y105 20,820 1,117 5.67 2,747 27.89 0.5495
2024-01-05 2023-12-31 13F MERCK Com 58933Y105 19,703 597 3.12 2,148 9.26 0.4620
2023-10-16 2023-09-30 13F MERCK Com 58933Y105 19,106 464 2.49 1,967 -8.60 0.4609
2023-07-25 2023-06-30 13F MERCK Com 58933Y105 18,642 -779 -4.01 2,151 4.11 0.4887
2023-04-25 2023-03-31 13F MERCK Com 58933Y105 19,421 -218 -1.11 2,066 103,200.00 0.4928
2023-01-20 2022-12-31 13F MERCK Com 58933Y105 19,639 -511 -2.54 2 -99.88 0.5283
2022-10-14 2022-09-30 13F MERCK Com 58933Y105 20,150 1,047 5.48 1,736 -0.34 0.4518
2022-08-01 2022-06-30 13F MERCK Com 58933Y105 19,103 -6 -0.03 1,742 11.10 0.4135
2022-04-22 2022-03-31 13F MERCK Com 58933Y105 19,109 -387 -1.99 1,568 4.95 0.2934
2022-01-25 2021-12-31 13F MERCK Com 58933Y105 19,496 -151 -0.77 1,494 1.22 0.2649
2021-10-28 2021-09-30 13F MERCK Com 58933Y105 19,647 47 0.24 1,476 -3.21 0.2868
2021-07-08 2021-06-30 13F MERCK Com 58933Y105 19,600 581 3.05 1,525 4.02 0.2926
2021-04-26 2021-03-31 13F MERCK Com 58933Y105 19,019 1,220 6.85 1,466 0.69 0.3040
2021-01-28 2020-12-31 13F MERCK Com 58933Y105 17,799 -37 -0.21 1,456 -1.56 0.3192
2020-10-27 2020-09-30 13F MERCK Com 58933Y105 17,836 152 0.86 1,479 8.11 0.3766
2020-07-17 2020-06-30 13F MERCK Com 58933Y105 17,684 439 2.55 1,368 3.09 0.3754
2020-04-23 2020-03-31 13F MERCK Com 58933Y105 17,245 4,029 30.49 1,327 10.40 0.4346
2020-01-22 2019-12-31 13F MERCK Com 58933Y105 13,216 2,560 24.02 1,202 34.00 0.3228
2019-10-18 2019-09-30 13F MERCK Com 58933Y105 10,656 200 1.91 897 2.28 0.2666
2019-07-05 2019-06-30 13F MERCK Com 58933Y105 10,456 -374 -3.45 877 -2.66 0.2649
2019-04-05 2019-03-31 13F MERCK Com 58933Y105 10,830 0 0.00 901 8.82 0.2753
2019-02-05 2018-12-31 13F MERCK Com 58933Y105 10,830 -129 -1.18 828 6.56 0.2861
2018-10-11 2018-09-30 13F MERCK Com 58933Y105 10,959 -1,275 -10.42 777 4.58 0.2319
2018-08-01 2018-06-30 13F MERCK Com 58933Y105 12,234 -364 -2.89 743 8.31 0.2380
2018-04-23 2018-03-31 13F MERCK Com 58933Y105 12,598 1,219 10.71 686 7.19 0.2247
2018-02-13 2017-12-31 13F/A-1 MERCK Com 58933Y105 11,379 -66 -0.58 640 -12.57 0.2082
2017-10-23 2017-09-30 13F MERCK Common Stock 58933Y105 11,445 -66 -0.57 732 -0.68 0.2535
2017-07-26 2017-06-30 13F MERCK Com 58933Y105 11,511 -1,600 -12.20 737 -11.52 0.2652
2017-05-04 2017-03-31 13F MERCK Com 58933Y105 13,111 1,235 10.40 833 19.17 0.3043
2017-02-15 2016-12-31 13F MERCK Com 58933Y105 11,876 76 0.64 699 -5.16 0.2439
2016-11-03 2016-09-30 13F MERCK Com 58933Y105 11,800 0 0.00 737 8.38 0.3029
2016-08-19 2016-06-30 13F MERCK COMMON STOCK 58933Y105 11,800 830 7.57 680 17.24 0.2873
2016-05-05 2016-03-31 13F MERCK COMMON STOCK 58933Y105 10,970 -205 -1.83 580 -1.69 0.2606
2016-01-25 2015-12-31 13F MERCK COMMON STOCK 58933Y105 11,175 11,175 0.00 590 0.2782
2014-07-14 2014-06-30 13F MERCK COMMON STOCK 58933Y105 0 -6,237 -100.00 0 -100.00
2014-05-15 2014-03-31 13F MERCK COMMON STOCK 58933Y105 6,237 720 13.05 354 28.26 0.2229
2014-02-27 2013-12-31 13F MERCK COMMON STOCK 58933Y105 5,517 -357 -6.08 276 -1.43 0.1722
2013-11-04 2013-09-30 13F MERCK Common Stock 58933Y105 5,874 0 0.00 280 2.56 0.1868
2013-08-08 2013-06-30 13F MERCK COMMON STOCK 58933Y105 5,874 5,874 273 0.1840
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.