David A. Siegel Merck & Co., Inc. Transaction History

Two Sigma Advisers, LP

$47 Billion
Q3 2025

A detailed history of David A. Siegel (Two Sigma Advisers, LP) transactions in Merck & Co., Inc. stock. As of the latest transaction made, Two Sigma Advisers, LP holds 2,320,900 shares of MRK stock, worth $216 Million. This represents 0.41% of its overall portfolio holdings.

Number of Shares

2,320,900

Previous 5,678,600 59.13%

Holding current value

$216 Million

Previous $450 Million 56.67%

% of portfolio

0.41%

Previous 0.98%

33 transactions

Quarter	Operation	Price Per share	shares change	shares Held
Q3 2025 Nov 14, 2025	SELL	$77.6 - $87.37 $261 Million - $293 Million	-3,357,700 Reduced 59.13%	2,320,900 $195 Million
Q2 2025 Aug 14, 2025	BUY	$73.47 - $87.12 $176 Million - $208 Million	2,390,000 Added 72.68%	5,678,600 $450 Million
Q1 2025 May 15, 2025	SELL	$83.01 - $101.02 $133 Million - $161 Million	-1,598,500 Reduced 32.71%	3,288,600 $295 Million
Q4 2024 Feb 14, 2025	BUY	$96.31 - $114.76 $60 Million - $71.5 Million	623,000 Added 14.61%	4,887,100 $486 Million
Q3 2024 Nov 14, 2024	BUY	$111.15 - $128.97 $290 Million - $337 Million	2,610,800 Added 157.91%	4,264,100 $484 Million

Q2 2024 Aug 14, 2024	SELL	$123.8 - $132.96 $53.5 Million - $57.5 Million	-432,300 Reduced 20.73%	1,653,300 $205 Million
Q1 2024 May 15, 2024	SELL	$113.24 - $131.95 $299 Million - $348 Million	-2,637,300 Reduced 55.84%	2,085,600 $275 Million
Q4 2023 Feb 14, 2024	BUY	$100.18 - $109.02 $354 Million - $385 Million	3,534,202 Added 297.32%	4,722,900 $515 Million
Q3 2023 Nov 14, 2023	BUY	$102.95 - $114.33 $122 Million - $135 Million	1,184,798 Added 30379.44%	1,188,698 $122 Million
Q2 2023 Aug 14, 2023	SELL	$108.61 - $118.38 $6.23 Million - $6.8 Million	-57,400 Reduced 93.64%	3,900 $450,000
Q1 2023 May 15, 2023	SELL	$102.94 - $114.86 $48.6 Million - $54.2 Million	-471,899 Reduced 88.5%	61,300 $6.52 Million
Q4 2022 Feb 14, 2023	SELL	$87.44 - $112.11 $185 Million - $238 Million	-2,119,100 Reduced 79.9%	533,199 $59.1 Million
Q3 2022 Nov 14, 2022	SELL	$84.53 - $94.96 $111 Million - $125 Million	-1,311,700 Reduced 33.09%	2,652,299 $228 Million
Q2 2022 Aug 15, 2022	SELL	$83.49 - $94.64 $140 Million - $159 Million	-1,676,300 Reduced 29.72%	3,963,999 $361 Million
Q1 2022 May 16, 2022	BUY	$73.51 - $82.4 $69.1 Million - $77.4 Million	939,700 Added 19.99%	5,640,299 $463 Million
Q4 2021 Feb 14, 2022	SELL	$72.28 - $90.54 $114 Million - $143 Million	-1,579,700 Reduced 25.15%	4,700,599 $360 Million
Q3 2021 Nov 15, 2021	BUY	$71.68 - $78.83 $57.4 Million - $63.1 Million	801,000 Added 14.62%	6,280,299 $472 Million
Q2 2021 Aug 16, 2021	BUY	$70.31 - $77.77 $129 Million - $143 Million	1,837,100 Added 50.44%	5,479,299 $426 Million
Q1 2021 May 17, 2021	SELL	$68.86 - $81.11 $75.8 Million - $89.3 Million	-1,101,400 Reduced 23.22%	3,642,199 $281 Million
Q4 2020 Feb 16, 2021	BUY	$71.77 - $79.65 $19 Million - $21 Million	264,200 Added 5.9%	4,743,599 $388 Million
Q3 2020 Nov 16, 2020	SELL	$73.18 - $82.95 $50.9 Million - $57.7 Million	-695,500 Reduced 13.44%	4,479,399 $372 Million
Q2 2020 Aug 14, 2020	BUY	$70.42 - $80.13 $50.5 Million - $57.5 Million	717,100 Added 16.09%	5,174,899 $400 Million
Q1 2020 May 15, 2020	SELL	$63.36 - $87.82 $52.7 Million - $73 Million	-831,000 Reduced 15.71%	4,457,799 $343 Million
Q4 2019 Feb 14, 2020	BUY	$77.58 - $87.54 $220 Million - $249 Million	2,841,000 Added 116.06%	5,288,799 $481 Million
Q3 2019 Nov 14, 2019	BUY	$76.08 - $82.93 $61.1 Million - $66.6 Million	803,300 Added 48.85%	2,447,799 $206 Million
Q2 2019 Aug 14, 2019	BUY	$69.84 - $81.59 $80.8 Million - $94.4 Million	1,156,637 Added 237.08%	1,644,499 $138 Million
Q1 2019 May 15, 2019	SELL	$69.58 - $79.36 $86.4 Million - $98.6 Million	-1,242,400 Reduced 71.8%	487,862 $40.6 Million
Q4 2018 Feb 14, 2019	BUY	$65.24 - $75.71 $40.7 Million - $47.3 Million	624,600 Added 56.49%	1,730,262 $132 Million
Q3 2018 Nov 14, 2018	BUY	$57.69 - $67.84 $51.9 Million - $61 Million	898,900 Added 434.75%	1,105,662 $78.4 Million
Q2 2018 Aug 14, 2018	SELL	$50.83 - $59.72 $41.8 Million - $49.1 Million	-823,000 Reduced 79.92%	206,762 $12.6 Million
Q1 2018 May 15, 2018	SELL	$50.96 - $59.23 $20.3 Million - $23.6 Million	-399,281 Reduced 27.94%	1,029,762 $56.1 Million
Q4 2017 Feb 14, 2018	SELL	$51.62 - $61.64 $4.45 Million - $5.31 Million	-86,207 Reduced 5.69%	1,429,043 $80.4 Million
Q3 2017 Nov 14, 2017	BUY	$58.67 - $63.13 $88.9 Million - $95.7 Million	1,515,250	1,515,250 $97 Million

Others Institutions Holding MRK

# of Institutions

3,878

Shares Held

1.9B

Call Options Held

30.1M

Put Options Held

27.7M

View Full List

About Merck & Co., Inc.

Ticker MRK
Exchange NYSE
Sector Healthcare
Industry Drug Manufacturers—General
Shares Outstandng 2,533,280,000
Market Cap $235B
Description
Merck & Co., Inc. operates as a healthcare company worldwide. It operates through two segments, Pharmaceutical and Animal Health. The Pharmaceutical segment offers human health pharmaceutical products in the areas of oncology, hospital acute care, immunology, neuroscience, virology, cardiovascular, and diabetes, as well as vaccine products, ...

More about MRK

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