Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionManning & Napier Advisors Llc
Latest Disclosed Ownership176,281 shares
Latest Disclosed Value $ 21,204,841
Manning & Napier Advisors Llc reports 0.44% increase in ownership of MRK / Merck & Co., Inc.

On April 30, 2026 - Manning & Napier Advisors Llc filed a 13F-HR form disclosing ownership of 176,281 shares of Merck & Co., Inc. (MX:MRK) valued at $21,204,841 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 175,513 shares of Merck & Co., Inc.. This represents a change in shares of 0.44% 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)
2026-04-30 2026-03-31 13F MERCK COM 58933Y105 176,281 768 0.44 21,205 13.91 0.2990
2026-02-03 2025-12-31 13F MERCK COM 58933Y105 175,513 -11,241 -6.02 18,615 18.76 0.2418
2025-10-27 2025-09-30 13F MERCK COM 58933Y105 186,754 -71,367 -27.65 15,674 -23.29 0.1999
2025-08-13 2025-06-30 13F Merck CS 58933Y105 258,121 189,837 278.01 20,433 233.38 0.2435
2025-04-22 2025-03-31 13F MERCK N CO INC CS 58933Y105 68,284 -6,332 -8.49 6,129 -17.42 0.0756
2025-01-23 2024-12-31 13F MERCK N CO INC CS 58933Y105 74,616 74,616 7,423 0.0847
2024-07-11 2024-06-30 13F MERCK COM 58933Y105 0 -455,073 -100.00 0 -100.00
2017-11-07 2017-09-30 13F MERCK COM 58933Y105 455,073 14,044 3.18 29,137 3.09 0.2496
2017-07-20 2017-06-30 13F MERCK COM 58933Y105 441,029 57,715 15.06 28,264 16.05 0.2430
2017-04-06 2017-03-31 13F MERCK COM 58933Y105 383,314 3,684 0.97 24,354 8.98 0.1888
2017-01-23 2016-12-31 13F MERCK COM 58933Y105 379,630 43,654 12.99 22,347 6.58 0.1462
2016-10-31 2016-09-30 13F MERCK COM 58933Y105 335,976 -68,423 -16.92 20,967 -10.00 0.1287
2016-08-05 2016-06-30 13F MERCK COM 58933Y105 404,399 -97,159 -19.37 23,296 -12.21 0.1412
2016-04-20 2016-03-31 13F/A-1 MERCK & CO INC COM 58933Y105 501,558 -77,252 -13.35 26,535 -13.20 0.1537
2016-04-14 2016-03-31 13F MERCK & CO INC COM 58933Y105 501,558 26,535
2016-01-12 2015-12-31 13F MERCK & CO INC COM 58933Y105 578,810 -5,599,557 -90.63 30,571 -89.98 0.1784
2015-10-22 2015-09-30 13F/A-1 MERCK & CO INC COM 58933Y105 6,178,367 -168,872 -2.66 305,148 -15.55 1.6413
2015-10-22 2015-09-30 13F MERCK & CO INC COM 58933Y105 6,347,239 361,347
2015-07-08 2015-06-30 13F MERCK & CO INC COM 58933Y105 6,347,239 5,948,885 1,493.37 361,347 1,478.21 1.5722
2015-04-20 2015-03-31 13F MERCK & CO INC COM 58933Y105 398,354 398,354 0.00 22,896 0.1083
2015-02-02 2014-12-31 13F MERCK & CO INC COM 58933Y105 0 -377,389 -100.00 0 -100.00
2014-10-10 2014-09-30 13F MERCK & CO INC COM 58933Y105 377,389 -2,803 -0.74 22,371 1.72 0.0930
2014-07-18 2014-06-30 13F MERCK & CO INC COM 58933Y105 380,192 26,698 7.55 21,992 9.60 0.0863
2014-04-22 2014-03-31 13F MERCK & CO INC COM 58933Y105 353,494 -55,688 -13.61 20,066 -2.01 0.0828
2014-01-29 2013-12-31 13F MERCK & CO INC COM 58933Y105 409,182 -12,865 -3.05 20,478 1.92 0.0926
2013-10-18 2013-09-30 13F MERCK & CO INC COM 58933Y105 422,047 2,354 0.56 20,092 3.08 0.0945
2013-07-31 2013-06-30 13F MERCK & CO INC 58933Y105 58933Y105 419,693 419,693 19,492 0.1037
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.