Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionCullinan Associates Inc
Latest Disclosed Ownership48,045 shares
Latest Disclosed Value $ 5,779,294
Cullinan Associates Inc reports 4.93% decrease in ownership of MRK / Merck & Co., Inc.

On May 1, 2026 - Cullinan Associates Inc filed a 13F-HR form disclosing ownership of 48,045 shares of Merck & Co., Inc. (MX:MRK) valued at $5,779,294 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 30, 2026 disclosing 50,534 shares of Merck & Co., Inc.. This represents a change in shares of -4.93% 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)
2026-05-01 2026-03-31 13F Merck COM 58933Y105 48,045 -2,489 -4.93 5,779 8.65 0.4674
2026-01-30 2025-12-31 13F Merck COM 58933Y105 50,534 910 1.83 5,319 27.74 0.3605
2025-10-27 2025-09-30 13F Merck COM 58933Y105 49,624 30 0.06 4,165 6.09 0.2712
2025-07-22 2025-06-30 13F Merck COM 58933Y105 49,594 4,275 9.43 3,926 -3.49 0.2589
2025-04-22 2025-03-31 13F Merck COM 58933Y105 45,319 441 0.98 4,068 -8.89 0.2876
2025-01-24 2024-12-31 13F Merck COM 58933Y105 44,878 -1,390 -3.00 4,464 -9.60 0.2866
2024-10-23 2024-09-30 13F Merck COM 58933Y105 46,268 2,300 5.23 4,939 -9.28 0.2786
2024-07-10 2024-06-30 13F Merck COM 58933Y105 43,968 3,720 9.24 5,443 2.50 0.3080
2024-04-18 2024-03-31 13F Merck COM 58933Y105 40,248 -18,731 -31.76 5,311 -17.41 0.2978
2024-01-24 2023-12-31 13F Merck COM 58933Y105 58,979 -6,284 -9.63 6,430 -4.30 0.3585
2023-10-11 2023-09-30 13F Merck COM 58933Y105 65,263 -6,481 -9.03 6,719 -18.85 0.3913
2023-07-14 2023-06-30 13F Merck COM 58933Y105 71,744 -5,102 -6.64 8,279 1.26 0.4550
2023-04-05 2023-03-31 13F Merck COM 58933Y105 76,846 20,104 35.43 8,176 136,150.00 0.4776
2023-01-11 2022-12-31 13F Merck COM 58933Y105 56,742 2,923 5.43 6 -99.87 0.3489
2022-10-19 2022-09-30 13F Merck COM 58933Y105 53,819 7,276 15.63 4,635 9.24 0.2927
2022-07-08 2022-06-30 13F Merck COM 58933Y105 46,543 -5,440 -10.46 4,243 -0.52 0.2594
2022-04-21 2022-03-31 13F Merck COM 58933Y105 51,983 9,460 22.25 4,265 30.87 0.2238
2022-01-07 2021-12-31 13F Merck COM 58933Y105 42,523 -68,210 -61.60 3,259 -60.82 0.1659
2021-10-08 2021-09-30 13F Merck COM 58933Y105 110,733 -1,046 -0.94 8,317 -4.33 0.4595
2021-07-07 2021-06-30 13F Merck COM 58933Y105 111,779 -16,000 -12.52 8,693 -11.75 0.4868
2021-04-20 2021-03-31 13F Merck COM 58933Y105 127,779 -385 -0.30 9,850 -6.05 0.5668
2021-01-14 2020-12-31 13F Merck COM 58933Y105 128,164 3,683 2.96 10,484 1.53 0.6289
2020-10-09 2020-09-30 13F Merck COM 58933Y105 124,481 27,575 28.46 10,326 37.79 0.6657
2020-07-07 2020-06-30 13F Merck COM 58933Y105 96,906 -11,320 -10.46 7,494 -10.00 0.5256
2020-04-01 2020-03-31 13F Merck COM 58933Y105 108,226 -3,489 -3.12 8,327 -18.04 0.6807
2020-01-15 2019-12-31 13F Merck COM 58933Y105 111,715 -1,241 -1.10 10,160 6.85 0.6792
2019-10-01 2019-09-30 13F Merck COM 58933Y105 112,956 -200 -0.18 9,509 0.22 0.6769
2019-07-16 2019-06-30 13F Merck COM 58933Y105 113,156 -7,050 -5.86 9,488 -5.10 0.6887
2019-04-30 2019-03-31 13F Merck COM 58933Y105 120,206 1,450 1.22 9,998 10.18 0.7510
2019-01-11 2018-12-31 13F Merck COM 58933Y105 118,756 -3,950 -3.22 9,074 4.24 0.7493
2018-10-19 2018-09-30 13F Merck COM 58933Y105 122,706 -35,000 -22.19 8,705 -9.07 0.6302
2018-07-09 2018-06-30 13F Merck COM 58933Y105 157,706 -6,800 -4.13 9,573 6.83 0.7325
2018-04-26 2018-03-31 13F Merck COM 58933Y105 164,506 -555 -0.34 8,961 -3.52 0.6788
2018-01-17 2017-12-31 13F Merck COM 58933Y105 165,061 -65,200 -28.32 9,288 -37.00 0.6821
2017-10-16 2017-09-30 13F Merck COM 58933Y105 230,261 -300 -0.13 14,744 -0.22 1.1355
2017-07-12 2017-06-30 13F Merck COM 58933Y105 230,561 7,043 3.15 14,777 4.05 1.1506
2017-04-17 2017-03-31 13F Merck COM 58933Y105 223,518 557 0.25 14,202 8.20 1.1579
2017-01-30 2016-12-31 13F Merck COM 58933Y105 222,961 2,900 1.32 13,126 -4.43 1.1180
2016-10-03 2016-09-30 13F Merck COM 58933Y105 220,061 -11,100 -4.80 13,734 3.13 1.1741
2016-07-01 2016-06-30 13F Merck COM 58933Y105 231,161 4,050 1.78 13,317 10.83 1.0826
2016-05-20 2016-03-31 13F Merck COM 58933Y105 227,111 -4,398 -1.90 12,016 -1.73 1.0263
2016-01-12 2015-12-31 13F Merck COM 58933Y105 231,509 -2,880 -1.23 12,228 5.63 1.0646
2015-10-05 2015-09-30 13F Merck COM 58933Y105 234,389 85,295 57.21 11,576 36.38 1.0573
2015-07-06 2015-06-30 13F Merck COM 58933Y105 149,094 4,150 2.86 8,488 1.88 0.7000
2015-04-14 2015-03-31 13F Merck COM 58933Y105 144,944 -46,324 -24.22 8,331 -23.30 0.6464
2015-01-21 2014-12-31 13F Merck Common 589331107 191,268 11,635 6.48 10,862 2.01 1.1497
2014-11-12 2014-09-30 13F Merck Common 589331107 179,633 32,835 22.37 10,648 56.17 1.2128
2014-08-15 2014-06-30 13F Merck Common 589331107 146,798 -37,175 -20.21 6,818 -34.72 1.1093
2014-05-08 2014-03-31 13F Merck Common 589331107 183,973 -11,950 -6.10 10,444 6.51 1.1878
2014-02-14 2013-12-31 13F Merck Common 589331107 195,923 16,375 9.12 9,806 14.72 1.1367
2013-10-18 2013-09-30 13F Merck Common 589331107 179,548 -1,000 -0.55 8,548 1.93 1.1460
2013-08-13 2013-06-30 13F Merck Common 589331107 180,548 180,548 8,386 1.1336
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.