默克公司
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionCi Investments Inc.
Latest Disclosed Ownership1,237,783 shares
Latest Disclosed Value $ 148,892,917
Ci Investments Inc. ownership in MRK / Merck & Co., Inc.

On May 13, 2026 - Ci Investments Inc. filed a 13F-HR form disclosing ownership of 1,237,783 shares of Merck & Co., Inc. (MX:MRK) valued at $148,892,917 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 994,122 shares of Merck & Co., Inc.. This represents a change in shares of 24.51% during the quarter.

Ci Investments Inc. has a history of taking positions in derivatives of the underlying security (MRK) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:MRK / Merck & Co., Inc. Historical Put/Call Ratio
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)
2026-05-13 2026-03-31 13F MERCK & CO INC COM 58933Y105 1,237,783 243,661 24.51 148,893 42.29 0.7212
2026-02-12 2025-12-31 13F MERCK & CO INC COM 58933Y105 994,122 -435,657 -30.47 104,641 87,100.83 0.4584
2025-11-12 2025-09-30 13F MERCK & CO INC COM 58933Y105 1,429,779 663,687 86.63 120 100.00 0.4361
2025-08-12 2025-06-30 13F MERCK & CO INC COM 58933Y105 766,092 -1,071,400 -58.31 61 -63.41 0.2275
2025-05-13 2025-03-31 13F MERCK & CO INC COM 58933Y105 1,837,492 89,257 5.11 165 -5.20 0.6949
2025-02-12 2024-12-31 13F MERCK & CO INC COM 58933Y105 1,748,235 448,204 34.48 174 17.69 0.6551
2024-11-12 2024-09-30 13F MERCK & CO INC COM 58933Y105 1,300,031 27,990 2.20 148 -6.37 0.5619
2024-08-12 2024-06-30 13F MERCK & CO INC COM 58933Y105 1,272,041 -9,798 -0.76 157 -7.10 0.6201
2024-05-13 2024-03-31 13F MERCK & CO INC COM 58933Y105 1,281,839 378,275 41.86 169 72.45 0.6713
2024-02-12 2023-12-31 13F MERCK & CO INC COM 58933Y105 903,564 -62,575 -6.48 99 -1.01 0.5094
2023-11-13 2023-09-30 13F MERCK & CO INC COM 58933Y105 966,139 89,721 10.24 99 -1.98 0.5549
2023-08-11 2023-06-30 13F MERCK & CO INC COM 58933Y105 876,418 163,845 22.99 101 34.67 0.5102
2023-05-12 2023-03-31 13F MERCK & CO INC COM 58933Y105 712,573 390,310 121.12 76 114.29 0.3814
2023-02-10 2022-12-31 13F MERCK & CO INC COM 58933Y105 322,263 -27,885 -7.96 36 -99.88 0.1808
2022-11-14 2022-09-30 13F MERCK & CO INC COM 58933Y105 350,148 1,980 0.57 30,155 -5.00 0.1565
2022-08-12 2022-06-30 13F MERCK & CO INC COM 58933Y105 348,168 -46,371 -11.75 31,742 -1.95 0.1480
2022-05-12 2022-03-31 13F MERCK & CO INC COM 58933Y105 394,539 17,780 4.72 32,372 12.11 0.1191
2022-02-11 2021-12-31 13F MERCK & CO INC COM 58933Y105 376,759 123,956 49.03 28,875 52.07 0.0996
2021-11-12 2021-09-30 13F MERCK & CO INC COM 58933Y105 252,803 -38,202 -13.13 18,988 -16.10 0.0707
2021-08-13 2021-06-30 13F MERCK & CO INC COM 58933Y105 291,005 25,066 9.43 22,631 10.39 0.0830
2021-05-13 2021-03-31 13F MERCK & CO. INC COM 58933Y105 265,939 -125,817 -32.12 20,501 -36.03 0.0865
2021-02-09 2020-12-31 13F MERCK & CO INC COM 58933Y105 391,756 -553,748 -58.57 32,046 -59.14 0.1412
2020-11-09 2020-09-30 13F MERCK & CO. INC COM 58933Y105 945,504 -286,255 -23.24 78,430 -17.66 0.3897
2020-08-07 2020-06-30 13F MERCK & CO INC COM 58933Y105 1,231,759 135,368 12.35 95,252 12.92 0.5077
2020-08-07 2020-03-31 13F MERCK & CO INC COM 58933Y105 1,096,391 -65,569 -5.64 84,356 -20.18 0.5117
2020-02-11 2019-12-31 13F MERCK & CO INC COM 58933Y105 1,161,960 -398,218 -25.52 105,680 -19.53 0.5367
2019-11-08 2019-09-30 13F MERCK & CO INC COM 58933Y105 1,560,178 89,257 6.07 131,336 6.49 0.6783
2019-08-12 2019-06-30 13F MERCK & CO INC COM 58933Y105 1,470,921 1,241,000 539.75 123,337 544.97 0.6863
2019-05-15 2019-03-31 13F MERCK COM 58933Y105 229,921 -34,754 -13.13 19,123 -5.44 0.1072
2019-02-15 2018-12-31 13F MERCK & CO INC COM 58933Y105 264,675 -4,200 -1.56 20,224 6.03 0.1305
2018-11-09 2018-09-30 13F MERCK COM 58933Y105 268,875 -9,500 -3.41 19,074 12.88 0.1428
2018-08-14 2018-06-30 13F MERCK COM 58933Y105 278,375 -11,000 -3.80 16,897 7.20 0.1327
2018-05-11 2018-03-31 13F MERCK & CO INC COM 58933Y105 289,375 4,700 1.65 15,762 -1.60 0.1815
2018-05-11 2017-12-31 13F/A-1 MERCK & CO INC COM 58933Y105 284,675 -7,846 -2.68 16,019 -14.47 0.1642
2018-02-02 2017-12-31 13F MERCK COM 58933Y105 284,675 -7,846 16,019
2018-05-11 2017-09-30 13F/A-1 MERCK & CO INC COM 58933Y105 292,521 -453,400 -60.78 18,730 -60.82 0.1828
2017-11-06 2017-09-30 13F MERCK & CO INC COM 58933Y105 292,521 -453,400 18,730
2017-08-10 2017-06-30 13F MERCK & CO INC COM 58933Y105 745,921 100 0.01 47,806 0.88 0.5177
2017-05-05 2017-03-31 13F MERCK COM 58933Y105 745,821 -13,500 -1.78 47,389 6.01 0.5385
2017-02-06 2016-12-31 13F MERCK & CO INC COM 58933Y105 759,321 627,321 475.24 44,701 442.62 0.4893
2016-11-04 2016-09-30 13F MERCK & CO INC COM 58933Y105 132,000 -739,000 -84.85 8,238 -83.58 0.0900
2016-08-24 2016-06-30 13F/A-1 MERCK & CO INC COM 58933Y105 871,000 -716,700 -45.14 50,178 -40.27 0.6115
2016-08-05 2016-06-30 13F MERCK & CO INC COM 58933Y105 871,000 50,178
2016-05-06 2016-03-31 13F MERCK & CO INC COM 58933Y105 1,587,700 -87,100 -5.20 84,005 -5.04 1.0715
2016-02-05 2015-12-31 13F MERCK & CO INC COM 58933Y105 1,674,800 -34,900 -2.04 88,463 4.76 1.1301
2015-11-12 2015-09-30 13F MERCK & CO INC COM 58933Y105 1,709,700 -31,900 -1.83 84,442 -14.83 1.0980
2015-08-12 2015-06-30 13F MERCK & CO INC COM 58933Y105 1,741,600 158,800 10.03 99,149 8.98 1.0957
2015-05-08 2015-03-31 13F MERCK & CO INC COM 58933Y105 1,582,800 6,500 0.41 90,979 1.63 0.9582
2015-02-05 2014-12-31 13F MERCK & CO INC COM 58933Y105 1,576,300 -164,800 -9.47 89,518 -13.27 1.0115
2014-11-03 2014-09-30 13F MERCK & CO INC COM 58933Y105 1,741,100 -846,600 -32.72 103,212 -31.05 1.0768
2014-08-01 2014-06-30 13F MERCK & CO INC COM 58933Y105 2,587,700 -337,200 -11.53 149,698 -9.85 1.4798
2014-05-06 2014-03-31 13F MERCK & CO INC COM 58933Y105 2,924,900 97,500 3.45 166,047 17.34 1.7513
2014-02-05 2013-12-31 13F/A-1 MERCK & CO INC COM 58933Y105 2,827,400 3,600 0.13 141,511 5.26 1.5485
2014-02-03 2013-12-31 13F MERCK & CO INC COM 58933Y105 2,827,400 141,511
2013-11-01 2013-09-30 13F MERCK & CO INC COM 58933Y105 2,823,800 2,767,300 4,897.88 134,441 5,023.51 1.5146
2013-08-02 2013-06-30 13F MERCK & CO INC COM 58933Y105 56,500 56,500 2,624 0.0286
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-02-12 2025-12-31 13F MERCK OPTIONS Call 0 -100.00 0 n/a n/a n/a
2025-11-12 2025-09-30 13F MERCK OPTIONS Call 720 100.00 0 n/a n/a n/a
2025-08-12 2025-06-30 13F MERCK OPTIONS Call 360 20.00 0 n/a n/a n/a
2025-05-13 2025-03-31 13F MERCK OPTIONS Call 300 0 n/a n/a n/a
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.