Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionJacobs Levy Equity Management, Inc
Latest Disclosed Ownership18,878 shares
Latest Disclosed Value $ 2,270,835
Jacobs Levy Equity Management, Inc ownership in 6MK / Merck & Co., Inc.

On May 15, 2026 - Jacobs Levy Equity Management, Inc filed a 13F-HR form disclosing ownership of 18,878 shares of Merck & Co., Inc. (BG:6MK) valued at $2,270,835 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 0 shares of Merck & Co., Inc..

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)
2026-05-15 2026-03-31 13F MERCK COM 58933Y105 18,878 18,878 2,271 0.0095
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 0 -3,346 -100.00 0 -100.00
2025-11-17 2025-09-30 13F MERCK COM 58933Y105 3,346 -48,795 -93.58 281 -93.22 0.0011
2025-08-14 2025-06-30 13F MERCK COM 58933Y105 52,141 -1,290,474 -96.12 4,127 -96.58 0.0162
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 1,342,615 -34,822 -2.53 120,513 -12.05 0.4780
2025-02-14 2024-12-31 13F MERCK COM 58933Y105 1,377,437 -549,238 -28.51 137,027 -37.37 0.4848
2024-11-14 2024-09-30 13F MERCK COM 58933Y105 1,926,675 647,882 50.66 218,793 38.20 0.8438
2024-08-14 2024-06-30 13F MERCK COM 58933Y105 1,278,793 176,527 16.01 158,315 8.85 0.6547
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 1,102,266 973,139 753.63 145,444 933.20 0.6500
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 129,127 11,722 9.98 14,077 16.47 0.0709
2023-11-17 2023-09-30 13F MERCK COM 58933Y105 117,405 117,405 12,087 0.0716
2023-08-14 2023-06-30 13F MERCK COM 58933Y105 0 -2,321 -100.00 0 -100.00
2023-05-15 2023-03-31 13F MERCK COM 58933Y105 2,321 -9,237 -79.92 247 -80.81 0.0015
2023-02-14 2022-12-31 13F MERCK COM 58933Y105 11,558 -4,573 -28.35 1,282 -7.70 0.0087
2022-11-15 2022-09-30 13F MERCK COM 58933Y105 16,131 -195,458 -92.38 1,389 -92.80 0.0110
2022-08-15 2022-06-30 13F MERCK COM 58933Y105 211,589 75,992 56.04 19,291 73.39 0.1493
2022-05-16 2022-03-31 13F MERCK COM 58933Y105 135,597 135,597 11,126 0.0748
2022-02-14 2021-12-31 13F MERCK COM 58933Y105 0 -7,470 -100.00 0 -100.00
2021-11-15 2021-09-30 13F MERCK COM 58933Y105 7,470 1,005 15.55 561 11.53 0.0038
2021-08-16 2021-06-30 13F MERCK COM 58933Y105 6,465 -378,207 -98.32 503 -98.30 0.0034
2021-05-17 2021-03-31 13F MERCK & CO. COM 58933Y105 384,672 231,963 151.90 29,654 137.38 0.2287
2021-02-16 2020-12-31 13F MERCK & CO. COM 58933Y105 152,709 20,174 15.22 12,492 13.63 0.1095
2020-11-16 2020-09-30 13F MERCK & CO. COM 58933Y105 132,535 -406,900 -75.43 10,994 -73.64 0.1140
2020-08-17 2020-06-30 13F MERCK & CO. COM 58933Y105 539,435 -174,005 -24.39 41,715 -24.01 0.4518
2020-05-15 2020-03-31 13F MERCK & CO. COM 58933Y105 713,440 474,604 198.72 54,892 152.70 0.7053
2020-02-14 2019-12-31 13F MERCK COM 58933Y105 238,836 33,896 16.54 21,722 25.91 0.2131
2019-11-14 2019-09-30 13F MERCK COM 58933Y105 204,940 139,880 215.00 17,252 216.26 0.2117
2019-08-13 2019-06-30 13F MERCK COM 58933Y105 65,060 55,560 584.84 5,455 590.51 0.0755
2019-05-14 2019-03-31 13F MERCK COM 58933Y105 9,500 0 0.00 790 8.82 0.0114
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 9,500 -102,761 -91.54 726 -90.88 0.0128
2018-11-14 2018-09-30 13F MERCK COM 58933Y105 112,261 -74,300 -39.83 7,964 -29.67 0.1130
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 186,561 -300,260 -61.68 11,324 -57.30 0.1780
2018-05-15 2018-03-31 13F MERCK COM 58933Y105 486,821 -240,130 -33.03 26,517 -35.18 0.4413
2018-02-13 2017-12-31 13F MERCK COM 58933Y105 726,951 520,790 252.61 40,906 209.89 0.7189
2017-11-14 2017-09-30 13F MERCK & CO. INC COM 58933Y105 206,161 145,201 238.19 13,200 237.86 0.2566
2017-11-09 2017-06-30 13F/A-1 MERCK COM 58933Y105 60,960 17,580 40.53 3,907 41.76 0.0835
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 60,960 17,580 3,907
2017-05-12 2017-03-31 13F MERCK COM 58933Y105 43,380 37,800 677.42 2,756 740.24 0.0557
2017-02-14 2016-12-31 13F MERCK COM 58933Y105 5,580 -208,400 -97.39 328 -97.54 0.0063
2016-11-14 2016-09-30 13F MERCK COM 58933Y105 213,980 213,980 0.00 13,354 0.2385
2016-05-16 2016-03-31 13F MERCK & CO. INC COM 58933Y105 0 -961,781 -100.00 0 -100.00
2016-02-16 2015-12-31 13F MERCK & CO. INC COM 58933Y105 961,781 -30,040 -3.03 50,801 3.71 1.0091
2015-11-16 2015-09-30 13F MERCK & CO INC COM 58933Y105 991,821 43,770 4.62 48,986 -9.24 1.0048
2015-08-14 2015-06-30 13F MERCK & CO INC COM 58933Y105 948,051 -150,269 -13.68 53,973 -14.51 1.0265
2015-05-15 2015-03-31 13F MERCK & CO. INC COM 58933Y105 1,098,320 15,820 1.46 63,131 2.69 1.0745
2015-02-17 2014-12-31 13F MERCK & CO. INC COM 58933Y105 1,082,500 94,340 9.55 61,475 4.95 1.0532
2014-11-14 2014-09-30 13F MERCK & CO INC COM 58933Y105 988,160 170,650 20.87 58,578 23.86 0.9785
2014-08-14 2014-06-30 13F MERCK & CO INC COM 58933Y105 817,510 512,940 168.41 47,293 210.24 0.7827
2014-02-14 2013-12-31 13F MERCK & CO. INC COM 58933Y105 304,570 222,170 269.62 15,244 288.58 0.2290
2013-11-14 2013-09-30 13F MERCK & CO INC COM 58933Y105 82,400 82,400 3,923 0.0664
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.