Merck & Co MRK

$148.64

+$0.56 (+0.38%)

Market open · Sep 24, 1:10 pm ET

After hours $148.00 -0.05%

Open$148.28

Prev close$148.08

Day range$148.01 – $151.46

Volume2.35M

Market cap$366.72B

P/E (TTM)118.9

Dividend yield2.26%

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership81.6%+0.02 pts vs. prior quarter

Institutions holding4,352-15 vs. prior quarter

Insider trades (recent)12 buys / 12 sellsBalanced

Short interest1.23% of floatDays to cover 2.2 · as of 31 Aug 2026

Short-sale volume share18.6%5-day average of daily volume

Net of large-order buying minus selling, in USD. Over this window: −$164.52M (7 inflow days, 13 outflow days).

Institutional holders4,352

Institutional ownership81.6%

Total transactions28

Bought12

Sold12

Report date	Shares short	% of float	Days to cover
31 Aug 2026	30,287,347	1.2%	2.2
14 Aug 2026	24,506,520	1.0%	2.8
31 Jul 2026	28,281,375	1.1%	3.3
15 Jul 2026	29,359,028	1.2%	3.4
30 Jun 2026	31,381,267	1.3%	2.3
15 Jun 2026	30,267,292	1.2%	2.6