Merck & Co., Inc.
MX ˙ BMV ˙ US58933Y1055
SecurityMX:MRK / Merck & Co., Inc.
InstitutionS&t Bank/pa
Latest Disclosed Ownership1,564 shares
Latest Disclosed Value $ 188,134
S&t Bank/pa reports 7.12% increase in ownership of MRK / Merck & Co., Inc.

On May 13, 2026 - S&t Bank/pa filed a 13F-HR form disclosing ownership of 1,564 shares of Merck & Co., Inc. (MX:MRK) valued at $188,134 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,460 shares of Merck & Co., Inc.. This represents a change in shares of 7.12% 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)
2026-05-13 2026-03-31 13F MERCK COM 58933Y105 1,564 104 7.12 188 22.88 0.0556
2026-02-13 2025-12-31 13F MERCK COM 58933Y105 1,460 -60 -3.95 154 20.47 0.0486
2025-11-14 2025-09-30 13F MERCK COM 58933Y105 1,520 503 49.46 128 58.75 0.0359
2025-08-06 2025-06-30 13F MERCK COM 58933Y105 1,017 93 10.06 81 -2.44 0.0245
2025-05-15 2025-03-31 13F MERCK COM 58933Y105 924 241 35.29 83 22.39 0.0271
2025-02-14 2024-12-31 13F Merck COM 58933Y105 683 683 68 0.0217
2022-11-10 2022-09-30 13F MERCK COM 58933Y105 0 -3,968 -100.00 0 -100.00
2022-08-10 2022-06-30 13F MERCK COM 58933Y105 3,968 -40 -1.00 362 10.03 0.0636
2022-05-16 2022-03-31 13F MERCK COM 58933Y105 4,008 178 4.65 329 12.29 0.0497
2022-02-14 2021-12-31 13F MERCK COM 58933Y105 3,830 -94 -2.40 293 -0.68 0.0428
2021-11-12 2021-09-30 13F MERCK COM 58933Y105 3,924 -30 -0.76 295 -4.22 0.0457
2021-08-13 2021-06-30 13F MERCK COM 58933Y105 3,954 340 9.41 308 10.79 0.0478
2021-05-17 2021-03-31 13F MERCK & CO. COM 58933Y105 3,614 15 0.42 278 -5.76 0.0452
2021-02-17 2020-12-31 13F MERCK & CO. COM 58933Y105 3,599 3,599 295 0.0530
2019-05-14 2019-03-31 13F MERCK COM 58933Y105 0 -327 -100.00 0 -100.00
2019-02-14 2018-12-31 13F MERCK COM 58933Y105 327 327 25 0.0058
2018-02-14 2017-12-31 13F MERCK COM 58933Y105 0 -4,601 -100.00 0 -100.00
2017-11-14 2017-09-30 13F MERCK COM 58933Y105 4,601 0 0.00 295 0.00 0.0527
2017-08-14 2017-06-30 13F MERCK COM 58933Y105 4,601 600 15.00 295 16.14 0.0536
2017-05-15 2017-03-31 13F MERCK COM 58933Y105 4,001 0 0.00 254 7.63 0.0483
2017-02-10 2016-12-31 13F MERCK COM 58933Y105 4,001 0 0.00 236 -5.22 0.0379
2016-11-14 2016-09-30 13F MERCK COM 58933Y105 4,001 0 0.00 249 7.79 0.0413
2016-08-10 2016-06-30 13F MERCK COM 58933Y105 4,001 0 0.00 231 9.48 0.0378
2016-05-11 2016-03-31 13F MERCK COM 58933Y105 4,001 -100 -2.44 211 -2.76 0.0351
2016-02-10 2015-12-31 13F MERCK COM 58933Y105 4,101 -100 -2.38 217 4.33 0.0336
2016-02-10 2015-09-30 13F/A-1 MERCK & CO INC COM 58933Y105 4,201 0 0.00 208 -12.97 0.0184
2016-02-10 2015-09-30 13F/A-1 MERCK & CO INC COM 58933Y105 4,201 0 208 0.0184
2015-11-02 2015-09-30 13F MERCK & CO INC COM 58933Y105 4,201 208
2015-08-14 2015-06-30 13F MERCK & CO INC COM 58933Y105 4,201 100 2.44 239 1.70 0.0349
2015-05-15 2015-03-31 13F MERCK & CO INC COM 58933Y105 4,101 0 0.00 235 0.86 0.0352
2015-02-17 2014-12-31 13F MERCK & CO INC COM 58933Y105 4,101 -300 -6.82 233 -10.73 0.0338
2014-11-07 2014-09-30 13F MERCK & CO INC COM 58933Y105 4,401 0 0.00 261 2.76 0.0390
2014-11-07 2014-06-30 13F/A-1 MERCK & CO INC COM 58933Y105 4,401 0 0.00 254 1.60 0.0382
2014-08-08 2014-06-30 13F MERCK & CO INC COM 58933Y105 4,401 254
2014-04-30 2014-03-31 13F MERCK & CO INC COM 58933Y105 4,401 0 0.00 250 13.64 0.0356
2014-01-21 2013-12-31 13F MERCK & CO INC COM 58933Y105 4,401 -750 -14.56 220 -10.20 0.0313
2013-10-23 2013-09-30 13F MERCK & CO INC COM 58933Y105 5,151 -200 -3.74 245 -1.61 0.0381
2013-07-25 2013-06-30 13F MERCK & CO INC COM 58933Y105 5,351 5,351 249 0.0436
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.