Merck & Co., Inc.
BG ˙ BUL ˙ US58933Y1055
SecurityBG:6MK / Merck & Co., Inc.
InstitutionBokf, Na
Latest Disclosed Ownership118,990 shares
Latest Disclosed Value $ 14,313,307
Bokf, Na ownership in 6MK / Merck & Co., Inc.

On May 8, 2026 - Bokf, Na filed a 13F-HR form disclosing ownership of 118,990 shares of Merck & Co., Inc. (BG:6MK) valued at $14,313,307 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 127,249 shares of Merck & Co., Inc.. This represents a change in shares of -6.49% during the quarter.

Bokf, Na has a history of taking positions in derivatives of the underlying security (6MK) 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.

BG:6MK / 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)
2026-05-08 2026-03-31 13F MERCK common 58933Y105 118,990 -8,259 -6.49 14,313 6.86 0.1685
2026-02-03 2025-12-31 13F MERCK common 58933Y105 127,249 -28,321 -18.20 13,394 2.59 0.2050
2025-11-13 2025-09-30 13F MERCK common 58933Y105 155,570 -37,905 -19.59 13,057 -14.75 0.1964
2025-08-12 2025-06-30 13F MERCK common 58933Y105 193,475 -19,192 -9.02 15,315 -19.77 0.2480
2025-05-13 2025-03-31 13F MERCK common 58933Y105 212,667 -129,883 -37.92 19,089 -43.86 0.3375
2025-02-14 2024-12-31 13F MERCK common 58933Y105 342,550 41,452 13.77 33,998 2.48 0.5743
2024-11-14 2024-09-30 13F MERCK common 58933Y105 301,098 1,593 0.53 33,175 -10.53 0.5887
2024-08-08 2024-06-30 13F MERCK COM 58933Y105 299,505 -3,843 -1.27 37,079 -6.69 0.6656
2024-05-15 2024-03-31 13F MERCK COM 58933Y105 303,348 -78,828 -20.63 39,736 -4.63 0.7235
2024-02-14 2023-12-31 13F MERCK COM 58933Y105 382,176 -8,292 -2.12 41,665 3.90 0.8159
2023-11-14 2023-09-30 13F MERCK COM 58933Y105 390,468 -15,292 -3.77 40,101 -14.35 0.8838
2023-08-21 2023-06-30 13F MERCK COM 58933Y105 405,760 -12,767 -3.05 46,821 5.15 0.9536
2023-05-11 2023-03-31 13F MERCK COM 58933Y105 418,527 -42,268 -9.17 44,527 -12.91 0.9318
2023-02-13 2022-12-31 13F MERCK COM 58933Y105 460,795 27,057 6.24 51,125 36.87 0.9435
2022-11-14 2022-09-30 13F MERCK COM 58933Y105 433,738 43,269 11.08 37,354 4.93 0.7558
2022-08-11 2022-06-30 13F MERCK COM 58933Y105 390,469 68,255 21.18 35,600 34.65 0.6825
2022-05-13 2022-03-31 13F MERCK COM 58933Y105 322,214 -10,151 -3.05 26,438 3.79 0.4357
2022-03-11 2021-12-31 13F MERCK COM 58933Y105 332,365 -13,855 -4.00 25,472 -2.05 0.3941
2021-11-10 2021-09-30 13F MERCK COM 58933Y105 346,220 67,754 24.33 26,004 21.13 0.4471
2021-04-21 2021-03-31 13F MERCK & CO. COM 58933Y105 278,466 -28,288 -9.22 21,467 -14.45 0.3904
2021-02-12 2020-12-31 13F MERCK & CO. COM 58933Y105 306,754 13,217 4.50 25,093 3.06 0.4788
2020-10-30 2020-09-30 13F MERCK & CO. COM 58933Y105 293,537 -22,176 -7.02 24,349 -0.27 0.5349
2020-08-12 2020-06-30 13F MERCK & CO. COM 58933Y105 315,713 35,054 12.49 24,414 13.06 0.5742
2020-05-13 2020-03-31 13F MERCK & CO. COM 58933Y105 280,659 66,211 30.88 21,593 10.71 0.6221
2020-02-12 2019-12-31 13F MERCK COM 58933Y105 214,448 19,717 10.13 19,504 18.98 0.4408
2019-11-13 2019-09-30 13F MERCK COM 58933Y105 194,731 -16,647 -7.88 16,393 -7.51 0.3948
2019-08-14 2019-06-30 13F MERCK COM 58933Y105 211,378 -5,186 -2.39 17,724 -1.60 0.4258
2019-05-15 2019-03-31 13F MERCK COM 58933Y105 216,564 -5,135 -2.32 18,012 6.33 0.4312
2019-02-13 2018-12-31 13F MERCK COM 58933Y105 221,699 17,273 8.45 16,940 16.81 0.4846
2018-11-13 2018-09-30 13F MERCK COM 58933Y105 204,426 -40,507 -16.54 14,502 -2.46 0.3640
2018-08-13 2018-06-30 13F MERCK COM 58933Y105 244,933 -21,750 -8.16 14,867 2.35 0.4001
2018-05-14 2018-03-31 13F MERCK COM 58933Y105 266,683 10,004 3.90 14,526 0.57 0.4126
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 256,679 1,975 0.78 14,443 -11.44 0.3978
2017-11-14 2017-09-30 13F MERCK COM 58933Y105 254,704 40,284 18.79 16,308 18.67 0.4735
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 214,420 -4,093 -1.87 13,742 -1.02 0.4323
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 218,513 6,999 3.31 13,884 11.50 0.4333
2017-02-14 2016-12-31 13F MERCK COM 58933Y105 211,514 -67,563 -24.21 12,452 -28.51 0.4097
2016-11-10 2016-09-30 13F MERCK COM 58933Y105 279,077 -129,672 -31.72 17,417 -26.04 0.5765
2016-08-12 2016-06-30 13F MERCK COM 58933Y105 408,749 4,975 1.23 23,548 10.22 0.8298
2016-05-13 2016-03-31 13F MERCK & CO INC COM 58933Y105 403,774 17,143 4.43 21,364 4.61 0.7722
2016-02-09 2015-12-31 13F MERCK & CO INC COM 58933Y105 386,631 41,234 11.94 20,423 19.71 0.7384
2015-11-13 2015-09-30 13F MERCK & CO INC COM 58933Y105 345,397 -31,688 -8.40 17,060 -20.53 0.6420
2015-08-13 2015-06-30 13F MERCK & CO INC COM 58933Y105 377,085 14,169 3.90 21,467 2.90 0.7287
2015-05-14 2015-03-31 13F MERCK & CO INC COM 58933Y105 362,916 -30,845 -7.83 20,861 -6.71 0.7021
2015-02-12 2014-12-31 13F MERCK & CO INC COM 58933Y105 393,761 76,610 24.16 22,361 18.94 0.7718
2014-11-13 2014-09-30 13F MERCK & CO INC COM 58933Y105 317,151 26,367 9.07 18,800 11.76 0.6283
2014-08-14 2014-06-30 13F MERCK & CO INC COM 58933Y105 290,784 -35,758 -10.95 16,822 -9.26 0.5398
2014-05-14 2014-03-31 13F MERCK & CO INC COM 58933Y105 326,542 35,128 12.05 18,538 27.10 0.6144
2014-02-14 2013-12-31 13F MERCK & CO INC COM 58933Y105 291,414 -83,177 -22.20 14,585 -18.22 0.4887
2013-11-12 2013-09-30 13F MERCK & CO INC COM 58933Y105 374,591 64,828 20.93 17,834 23.94 0.6475
2013-08-14 2013-06-30 13F MERCK & CO INC COM 58933Y105 309,763 309,763 14,389 0.5436
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
(%)
2023-08-21 2023-06-30 13F MERCK CALL Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-05-11 2023-03-31 13F MERCK CALL Call 150 425 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.