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Merck & Co., Inc. (MRK) Short Interest Ratio & Short Volume

Merck & Co., Inc. logo
$84.13 +0.92 (+1.11%)
Closing price 08/29/2025 03:59 PM Eastern
Extended Trading
$84.12 -0.01 (-0.01%)
As of 08/29/2025 07:56 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more.
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Merck & Co., Inc. Short Interest Data

Merck & Co., Inc. (MRK) has a short interest of 25.88 million shares, representing 1.04% of the float (the number of shares available for trading by the public). This marks a -10.05% decrease in short interest from the previous month. The short interest ratio (days to cover) is 1.7, indicating that it would take 1.7 days of the average trading volume of 10.99 million shares to cover all short positions.

Current Short Interest
25,880,000 shares
Previous Short Interest
28,770,000 shares
Change Vs. Previous Month
-10.05%
Dollar Volume Sold Short
$2.02 billion
Short Interest Ratio
1.7 Days to Cover
Last Record Date
July 31, 2025
Outstanding Shares
2,497,783,000 shares
Short Percent of Float
1.04%
Today's Trading Volume
10,870,371 shares
Average Trading Volume
10,986,189 shares
Today's Volume Vs. Average
99%
Short Selling Merck & Co., Inc.?
A Guide To High-Short-Interest Stocks

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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

MRK Short Interest Over Time

MRK Days to Cover Over Time

MRK Percentage of Float Shorted Over Time

Merck & Co., Inc. Short Interest History

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Report DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date
7/31/202525,880,000 shares $2.02 billion -10.1%1.0%1.7 $78.17
7/15/202528,770,000 shares $2.35 billion -18.0%1.2%1.9 $81.54
6/30/202535,090,000 shares $2.78 billion -2.0%1.4%2.1 $79.19
6/15/202535,800,000 shares $2.92 billion +3.6%1.4%2.2 $81.68
5/31/202534,560,000 shares $2.66 billion -16.3%1.4%2.1 $76.86
5/15/202541,270,000 shares $3.08 billion +11.1%1.6%2.5 $74.68
4/30/202537,140,000 shares $3.17 billion -11.4%1.5%2.2 $85.23
4/15/202541,930,000 shares $3.28 billion +10.5%1.7%2.4 $78.28
3/31/202537,940,000 shares $3.40 billion +2.2%1.5%2.3 $89.74
3/15/202537,130,000 shares $3.52 billion -9.3%1.5%2.4 $94.72
2/28/202540,940,000 shares $3.78 billion +27.1%1.6%2.8 $92.23
2/15/202532,210,000 shares $2.67 billion +8.8%1.3%2.3 $83.01
1/31/202529,600,000 shares $2.92 billion -13.3%1.2%2.3 $98.80
1/15/202534,120,000 shares $3.42 billion +10.3%N/A3 $100.20
12/31/202430,930,000 shares $3.08 billion -3.4%N/A2.8 $99.48
12/15/202432,030,000 shares $3.27 billion -2.3%N/A2.8 $102.00
11/30/202432,790,000 shares $3.33 billion +24.6%N/A3.1 $101.64
11/15/202426,320,000 shares $2.53 billion +0.3%N/A2.6 $96.30
10/31/202426,230,000 shares $2.68 billion +0.7%N/A2.8 $102.32
10/15/202426,040,000 shares $2.90 billion -4.5%N/A2.6 $111.54
9/30/202427,260,000 shares $3.10 billion +9.9%N/A2.9 $113.56
9/15/202424,810,000 shares $2.87 billion -4.3%N/A2.5 $115.86
8/31/202425,910,000 shares $3.07 billion +4.4%N/A2.7 $118.45
8/15/202424,810,000 shares $2.81 billion -7.2%N/A2.6 $113.31
7/31/202426,720,000 shares $3.02 billion +8.8%N/A2.9 $113.13
7/15/202424,570,000 shares $3.15 billion +5.2%N/A3 $128.12
6/30/202423,350,000 shares $2.89 billion +19.9%N/A2.8 $123.80
6/15/202419,470,000 shares $2.52 billion -4.6%N/A2.6 $129.48
5/31/202420,410,000 shares $2.56 billion +0.7%N/A2.5 $125.58
5/15/202420,270,000 shares $2.67 billion +8.1%N/A2.5 $131.74
4/30/202418,750,000 shares $2.42 billion -8.2%N/A2.3 $129.19
4/15/202420,430,000 shares $2.58 billion +4.3%N/A2.5 $126.19
3/31/202419,590,000 shares $2.58 billion -15.4%N/A2.3 $131.95
3/15/202423,160,000 shares $2.81 billion +39.5%N/A2.8 $121.53
2/29/202416,600,000 shares $2.11 billion -1.3%N/A2.1 $127.15
2/15/202416,820,000 shares $2.13 billion -1.2%N/A2 $126.54
1/31/202417,020,000 shares $2.06 billion -18.2%N/A2 $120.78
1/15/202420,810,000 shares $2.47 billion +16.5%N/A2.5 $118.63
12/31/202317,870,000 shares $1.95 billion +32.7%N/A2.2 $109.02
12/15/202313,470,000 shares $1.42 billion -19.3%N/A1.7 $105.64
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11/30/202316,690,000 shares $1.71 billion -7.4%N/A2.3 $102.48
11/15/202318,020,000 shares $1.83 billion +9.8%N/A2.7 $101.35
10/31/202316,410,000 shares $1.68 billion +3.9%N/A2.5 $102.68
10/15/202315,790,000 shares $1.64 billion +6.5%N/A2.4 $104.01
9/30/202314,830,000 shares $1.53 billion +6.8%N/A2.2 $102.95
9/15/202313,880,000 shares $1.49 billion -5.2%N/A2 $107.47
8/31/202314,640,000 shares $1.60 billion +1.2%N/A2 $108.98
8/15/202314,460,000 shares $1.57 billion +2.3%N/A1.9 $108.66
7/31/202314,140,000 shares $1.51 billion -21.1%N/A1.9 $106.65
7/15/202317,920,000 shares $1.92 billion +6.3%N/A2.5 $107.34
6/30/202316,860,000 shares $1.94 billion +12.7%N/A2.4 $115.36
6/15/202314,960,000 shares $1.64 billion -4.4%N/A2.1 $109.40
5/31/202315,650,000 shares $1.73 billion -20.2%N/A2.1 $110.41
5/15/202319,620,000 shares $2.28 billion +2.7%N/A2.6 $116.37
4/30/202319,100,000 shares $2.21 billion -10.5%N/A2.5 $115.47
4/15/202321,340,000 shares $2.46 billion -3.3%N/A2.6 $115.31
3/31/202322,070,000 shares $2.35 billion +13.0%N/A2.6 $106.39
3/15/202319,540,000 shares $2.10 billion -4.9%N/A2.3 $107.63
2/28/202320,550,000 shares $2.18 billion +5.6%N/A2.4 $106.24
2/15/202319,470,000 shares $2.10 billion +13.5%N/A2.2 $107.68
1/31/202317,150,000 shares $1.84 billion +5.7%N/A1.9 $107.41
1/15/202316,220,000 shares $1.82 billion -5.8%N/A1.7 $112.25
12/30/202217,210,000 shares $1.91 billion -16.1%N/A1.8 $110.95
12/15/202220,510,000 shares $2.25 billion +4.5%N/A2.2 $109.63
11/30/202219,630,000 shares $2.16 billion +0.8%N/A2.1 $110.12
11/15/202219,470,000 shares $1.94 billion -4.4%N/A2.2 $99.60
10/31/202220,360,000 shares $2.06 billion +5.8%N/A2.4 $101.20
10/15/202219,240,000 shares $1.77 billion -5.7%N/A2.3 $92.18
9/30/202220,400,000 shares $1.76 billion +4.9%N/A2.5 $86.12
9/15/202219,450,000 shares $1.69 billion +0.8%N/A2.2 $86.75
8/31/202219,290,000 shares $1.65 billion -2.4%N/A2 $85.36
8/15/202219,760,000 shares $1.79 billion +17.7%N/A1.9 $90.60
7/31/202216,790,000 shares $1.50 billion -17.4%N/A1.5 $89.34
7/15/202220,330,000 shares $1.93 billion -0.7%N/A1.8 $94.96
6/30/202220,470,000 shares $1.87 billion +2.6%N/A1.7 $91.17
6/15/202219,950,000 shares $1.69 billion -14.6%N/A1.7 $84.63
5/31/202223,350,000 shares $2.15 billion +8.3%N/A2 $92.03
5/15/202221,570,000 shares $1.95 billion +27.0%N/A1.9 $90.41
4/30/202216,980,000 shares $1.51 billion -11.9%0.7%1.5 $88.69
4/15/202219,280,000 shares $1.68 billion +14.4%0.8%1.6 $86.91
3/31/202216,860,000 shares $1.38 billion +1.6%0.7%1.4 $82.05
3/15/202216,590,000 shares $1.30 billion -14.8%0.7%1.4 $78.64
2/28/202219,460,000 shares $1.49 billion +10.3%0.8%1.5 $76.58
2/15/202217,650,000 shares $1.37 billion -12.2%0.7%1.3 $77.81
1/31/202220,090,000 shares $1.64 billion -14.5%0.8%1.4 $81.48
1/15/202223,490,000 shares $1.91 billion +1.4%0.9%1.7 $81.38
12/31/202123,160,000 shares $1.77 billion +8.8%0.9%1.7 $76.64
12/15/202121,290,000 shares $1.60 billion +13.7%0.8%1.3 $75.29
11/30/202118,730,000 shares $1.40 billion -15.6%0.7%1.1 $74.91
11/15/202122,180,000 shares $1.86 billion +6.4%0.9%1.5 $83.69
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10/29/202120,840,000 shares $1.83 billion -4.8%N/A1.4 $88.05
10/15/202121,880,000 shares $1.71 billion -3.0%N/A1.6 $78.33
9/30/202122,560,000 shares $1.69 billion -19.9%N/A1.7 $75.11
9/15/202128,180,000 shares $2.05 billion +2.8%N/A2.7 $72.81
8/31/202127,420,000 shares $2.09 billion +2.7%N/A2.7 $76.29
8/13/202126,690,000 shares $2.05 billion +15.2%N/A2.5 $76.72
7/30/202123,170,000 shares $1.78 billion +4.1%N/A2.1 $76.87
7/15/202122,250,000 shares $1.73 billion -7.0%N/A1.9 $77.90
6/30/202123,930,000 shares $1.86 billion +8.4%N/A2 $77.77
6/15/202122,070,000 shares $1.67 billion +17.2%N/A1.9 $75.70
5/28/202118,830,000 shares $1.43 billion -9.4%N/A1.5 $75.89
5/14/202120,790,000 shares $1.64 billion +1.6%0.8%1.7 $78.69
4/30/202120,470,000 shares $1.51 billion -2.6%0.8%1.6 $73.68
4/15/202121,020,000 shares $1.61 billion -11.5%0.8%1.8 $76.40
3/31/202123,740,000 shares $1.83 billion +30.9%0.9%2 $76.96
3/15/202118,140,000 shares $1.35 billion -11.0%0.7%1.5 $74.60
2/26/202120,380,000 shares $1.52 billion +10.3%0.8%2 $74.62
2/12/202118,470,000 shares $1.38 billion -0.6%0.7%1.9 $74.74
1/29/202118,580,000 shares $1.45 billion +1.9%0.7%2 $77.92
1/15/202118,230,000 shares $1.50 billion +14.2%0.7%2 $82.17
12/31/202015,970,000 shares $1.29 billion +17.5%0.6%1.8 $80.59
12/15/202013,590,000 shares $1.09 billion +0.7%0.5%1.6 $80.32
11/30/202013,500,000 shares $1.08 billion +0.3%N/A1.6 $79.86
11/15/202013,460,000 shares $1.09 billion -8.8%0.5%1.6 $81.09
10/30/202014,750,000 shares $1.12 billion +40.1%0.6%1.8 $75.89
10/15/202010,530,000 shares $847.77 million -4.1%0.4%1.3 $80.51
9/30/202010,980,000 shares $910.79 million +0.1%0.4%1.4 $82.95
9/15/202010,970,000 shares $923.78 million -9.4%0.4%1.4 $84.21
8/31/202012,110,000 shares $1.03 billion +2.6%0.5%1.4 $85.27

MRK Short Interest - Frequently Asked Questions

What is Merck & Co., Inc.'s current short interest?

Short interest is the volume of Merck & Co., Inc. shares that have been sold short but have not yet been closed out or covered. As of July 31st, traders have sold 25,880,000 shares of MRK short. 1.04% of Merck & Co., Inc.'s shares are currently sold short. Learn More on Merck & Co., Inc.'s current short interest.

What is a good short interest ratio for Merck & Co., Inc.?

The short interest ratio, also known as the "days to cover ratio", is calculated by dividing the number of shares of a stock sold short divided by its average trading volume. A short interest ratio ranging between 1 and 4 generally indicates strong positive sentiment about a stock and a lack of short sellers. A short interest ratio of 10 or greater indicates strong pessimism about a stock. MRK shares currently have a short interest ratio of 2.0. Learn More on Merck & Co., Inc.'s short interest ratio.

Which institutional investors are shorting Merck & Co., Inc.?

As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Merck & Co., Inc.: Marex Group plc, Hudson Bay Capital Management LP, Wolverine Trading LLC, Nomura Holdings Inc., Man Group plc, Hudson Bay Capital Management LP, Group One Trading LLC, BNP Paribas Financial Markets, Bank of America Corp DE, Jane Street Group LLC, Raymond James Financial Inc., Caption Management LLC, Volterra Technologies LP, Squarepoint Ops LLC, Alphadyne Asset Management LP, Qube Research & Technologies Ltd, Maven Securities LTD, Capula Management Ltd, Marshall Wace LLP, Walleye Capital LLC, Walleye Trading LLC, Lido Advisors LLC, Delta Accumulation LLC, Capital Fund Management S.A., Jefferies Financial Group Inc., Eisler Capital Management Ltd., MAI Capital Management, JPMorgan Chase & Co., Citigroup Inc., Garda Capital Partners LP, Mirae Asset Securities USA Inc., Simplex Trading LLC, Bank of Montreal Can, Wolverine Asset Management LLC, Insight Advisors LLC PA, Allianz Asset Management GmbH, Twin Tree Management LP, Concurrent Investment Advisors LLC, Total Wealth Planning & Management Inc., and IMC Chicago LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission.

What is a good short interest percentage for Merck & Co., Inc.?

Companies that have a short interest as a percentage of float below 10% indicates positive investor sentiment and few short sellers. Stocks with a short interest percentage above 10% is considered high, suggesting some investors are pessimistic about the stock. Companies with a short interest percentage of 20% or more indicates widespread negative sentiment. 1.04% of Merck & Co., Inc.'s floating shares are currently sold short.

Is Merck & Co., Inc.'s short interest increasing or decreasing?

Merck & Co., Inc. saw a drop in short interest in July. As of July 31st, there was short interest totaling 25,880,000 shares, a drop of 10.0% from the previous total of 28,770,000 shares. Changes in short volume can be used to identify positive and negative investor sentiment. Investors that short sell a stock are betting that its price will decline in the future. An increase in short sale volume suggests bearish (negative) sentiment among investors. A decrease on short sale volume suggests bullish (positive) sentiment.

How does Merck & Co., Inc.'s short interest compare to its competitors?

1.04% of Merck & Co., Inc.'s shares are currently sold short. Here is how the short interest of companies in the sector of "medical" compare to Merck & Co., Inc.: Amgen Inc. (2.33%), Corcept Therapeutics Incorporated (11.85%), Gilead Sciences, Inc. (1.61%), Moderna, Inc. (18.29%), Vertex Pharmaceuticals Incorporated (1.71%), AbbVie Inc. (0.86%), Bristol Myers Squibb Company (1.52%), Johnson & Johnson (0.71%), Eli Lilly and Company (0.84%), Pfizer Inc. (1.90%),

Which stocks are the most shorted right now?

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($70.87 billion), Invesco QQQ ($30.12 billion), iShares Russell 2000 ETF ($19.85 billion), iShares 20+ Year Treasury Bond ETF ($10.34 billion), Strategy Inc ($8.98 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($7.61 billion), SPDR S&P Biotech ETF ($6.81 billion), Invesco S&P 500 Equal Weight ETF ($6.14 billion), Palo Alto Networks, Inc. ($5.97 billion), and Super Micro Computer, Inc. ($5.28 billion). View all of the most shorted stocks.

What does it mean to sell short Merck & Co., Inc. stock?

Short selling MRK is an investing strategy that aims to generate trading profit from Merck & Co., Inc. as its price is falling. MRK shares are trading up $0.92 today. To short a stock, an investor borrows shares, sells them and buys the shares back on the public market later to return it to the lender. Short sellers are betting that a stock will decline in price. If the stock does drop after selling, the short seller buys it back at a lower price and returns it to the lender. The difference between the sell price and the buy price is the trader's profit.

How does a short squeeze work against Merck & Co., Inc.?

A short squeeze for Merck & Co., Inc. occurs when it has a large amount of short interest and its stock increases in price. This forces short sellers to cover their short interest positions by buying actual shares of MRK, which in turn drives the price of the stock up even further.

How often is Merck & Co., Inc.'s short interest reported?

Short interest is typically published by a stock exchange once per month. However, NASDAQ publishes a report for U.S. stocks, including MRK, twice per month. The most recent reporting period available is July, 31 2025.



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This page (NYSE:MRK) was last updated on 8/31/2025 by MarketBeat.com Staff
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