Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionMraz, Amerine & Associates, Inc.
Latest Disclosed Ownership15,209 shares
Latest Disclosed Value $ 1,829,496
Mraz, Amerine & Associates, Inc. reports 0.01% increase in ownership of MRK / Merck & Co., Inc.

On May 5, 2026 - Mraz, Amerine & Associates, Inc. filed a 13F-HR form disclosing ownership of 15,209 shares of Merck & Co., Inc. (MX:MRK) valued at $1,829,496 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 15,208 shares of Merck & Co., Inc.. This represents a change in shares of 0.01% 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)
2026-05-05 2026-03-31 13F MERCK COM 58933Y105 15,209 1 0.01 1,829 14.31 0.2697
2026-02-06 2025-12-31 13F MERCK COM 58933Y105 15,208 402 2.72 1,601 28.82 0.2378
2025-11-06 2025-09-30 13F MERCK COM 58933Y105 14,806 11,078 297.16 1,243 321.02 0.1936
2025-07-23 2025-06-30 13F MERCK COM 58933Y105 3,728 1,000 36.66 295 21.40 0.0473
2025-07-24 2025-03-31 13F/A-1 MERCK COM 58933Y105 2,728 2,728 243 0.0418
2025-04-30 2025-03-31 13F MERCK COM 58933Y105 2,728 2,728 243 0.0418
2025-07-24 2024-12-31 13F/A-1 MERCK COM 58933Y105 0 -2,066 -100.00 0 -100.00
2025-01-31 2024-12-31 13F MERCK COM 58933Y105 0 -2,066 0
2025-07-24 2024-09-30 13F/A-1 MERCK COM 58933Y105 2,066 -10 -0.48 235 -8.95 0.0424
2024-10-23 2024-09-30 13F MERCK COM 58933Y105 2,066 -10 235 0.0424
2025-07-24 2024-06-30 13F/A-1 MERCK COM 58933Y105 2,076 0 0.00 257 -5.86 0.0528
2024-08-01 2024-06-30 13F MERCK COM 58933Y105 2,076 0 257 0.0528
2025-07-24 2024-03-31 13F/A-1 MERCK COM 58933Y105 2,076 0 0.00 274 20.80 0.0518
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 2,076 0 274 0.0518
2025-07-24 2023-12-31 13F/A-1 MERCK COM 58933Y105 2,076 0 0.00 226 6.10 0.0474
2024-01-31 2023-12-31 13F MERCK COM 58933Y105 2,076 0 226 0.0474
2025-07-24 2023-09-30 13F/A-1 MERCK COM 58933Y105 2,076 0 0.00 214 -10.88 0.0482
2023-11-13 2023-09-30 13F MERCK COM 58933Y105 2,076 0 214 0.0482
2025-07-24 2023-06-30 13F/A-1 MERCK COM 58933Y105 2,076 -590 -22.13 240 -15.55 0.0563
2023-07-25 2023-06-30 13F MERCK COM 58933Y105 2,076 -590 240 0.0563
2025-07-24 2023-03-31 13F/A-1 MERCK COM 58933Y105 2,666 0 0.00 284 -4.07 0.0698
2023-04-20 2023-03-31 13F MERCK COM 58933Y105 2,666 0 284 0.0698
2023-01-12 2022-12-31 13F MERCK COM 58933Y105 2,666 0 0.00 296 28.26 0.0697
2022-10-25 2022-09-30 13F MERCK COM 58933Y105 2,666 0 0.00 230 -5.35 0.0618
2022-07-27 2022-06-30 13F MERCK COM 58933Y105 2,666 0 0.00 243 10.96 0.0624
2022-04-22 2022-03-31 13F MERCK COM 58933Y105 2,666 0 0.00 219 7.35 0.0521
2022-01-14 2021-12-31 13F MERCK COM 58933Y105 2,666 0 0.00 204 2.00 0.0524
2021-11-08 2021-09-30 13F MERCK COM 58933Y105 2,666 0 0.00 200 -3.38 0.0546
2021-08-03 2021-06-30 13F MERCK COM 58933Y105 2,666 60 2.30 207 2.99 0.0561
2021-04-26 2021-03-31 13F MERCK & CO. COM 58933Y105 2,606 0 0.00 201 -5.63 0.0584
2021-02-11 2020-12-31 13F MERCK & CO. COM 58933Y105 2,606 0 0.00 213 -1.39 0.0708
2020-11-03 2020-09-30 13F MERCK & CO. COM 58933Y105 2,606 0 0.00 216 6.93 0.0804
2020-07-29 2020-06-30 13F MERCK & CO. COM 58933Y105 2,606 0 0.00 202 0.50 0.0751
2020-05-06 2020-03-31 13F MERCK & CO. COM 58933Y105 2,606 -576 -18.10 201 -30.45 0.0790
2020-02-10 2019-12-31 13F MERCK COM 58933Y105 3,182 0 0.00 289 7.84 0.0825
2019-11-09 2019-09-30 13F MERCK COM 58933Y105 3,182 -600 -15.86 268 -15.46 0.0797
2019-08-02 2019-06-30 13F MERCK COM 58933Y105 3,782 -100 -2.58 317 -1.86 0.0942
2019-05-08 2019-03-31 13F MERCK COM 58933Y105 3,882 -472 -10.84 323 -3.00 0.1003
2019-02-11 2018-12-31 13F MERCK COM 58933Y105 4,354 0 0.00 333 7.77 0.1103
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 4,354 53 1.23 309 18.39 0.0916
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 4,301 -9 -0.21 261 11.06 0.0790
2018-05-14 2018-03-31 13F MERCK COM 58933Y105 4,310 23 0.54 235 -2.49 0.0744
2018-02-05 2017-12-31 13F MERCK COM 58933Y105 4,287 -127 -2.88 241 -14.84 0.0739
2017-11-06 2017-09-30 13F MERCK COM 58933Y105 4,414 -455 -9.34 283 -9.29 0.0895
2017-07-27 2017-06-30 13F MERCK COM 58933Y105 4,869 0 0.00 312 2.97 0.0971
2017-05-05 2017-03-31 13F MERCK COM 58933Y105 4,869 -725 -12.96 303 -7.90 0.0946
2017-01-31 2016-12-31 13F MERCK COM 58933Y105 5,594 5 0.09 329 -5.73 0.1032
2016-11-07 2016-09-30 13F MERCK COM 58933Y105 5,589 5 0.09 349 8.39 0.1192
2016-07-26 2016-06-30 13F MERCK COM 58933Y105 5,584 6 0.11 322 9.15 0.1127
2016-07-26 2016-03-31 13F/A-1 MERCK & CO INC COM 58933Y105 5,578 -35 -0.62 295 -0.34 0.1085
2016-05-16 2016-03-31 13F MERCK & CO INC COM 58933Y105 5,578 295
2016-02-11 2015-12-31 13F MERCK & CO INC COM 58933Y105 5,613 136 2.48 296 9.23 0.1128
2015-11-16 2015-09-30 13F MERCK & CO INC COM 58933Y105 5,477 -284 -4.93 271 -17.38 0.1072
2015-08-10 2015-06-30 13F MERCK & CO INC COM 58933Y105 5,761 5 0.09 328 -0.91 0.1231
2015-05-11 2015-03-31 13F MERCK & CO INC COM 58933Y105 5,756 5 0.09 331 1.22 0.1239
2015-03-02 2014-12-31 13F/A-1 MERCK & CO INC COM 58933Y105 5,751 677 13.34 327 8.64 0.1236
2015-02-17 2014-12-31 13F MERCK & CO INC COM 58933Y105 5,751 327
2014-11-14 2014-09-30 13F MERCK & CO INC COM 58933Y105 5,074 184 3.76 301 6.36 0.1159
2014-08-11 2014-06-30 13F MERCK & CO INC COM 58933Y105 4,890 -94 -1.89 283 0.00 0.1096
2014-05-09 2014-03-31 13F MERCK & CO INC COM 58933Y105 4,984 81 1.65 283 15.51 0.1183
2014-02-13 2013-12-31 13F MERCK & CO INC COM 58933Y105 4,903 6 0.12 245 5.15 0.1093
2013-10-18 2013-09-30 13F MERCK & CO INC COM 58933Y105 4,897 -804 -14.10 233 -12.08 0.1120
2013-09-19 2013-06-30 13F/A-1 MERCK & CO INC COM 58933Y105 5,701 5,701 265 0.1347
2013-08-08 2013-06-30 13F MERCK & CO INC COM 58933Y105 5,701 265
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.