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Insmed (INSM) Short Interest Ratio & Short Volume

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$144.75 +1.61 (+1.12%)
Closing price 04:00 PM Eastern
Extended Trading
$144.08 -0.67 (-0.47%)
As of 07:55 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.

Insmed Short Interest Data

Insmed (INSM) has a short interest of 10.56 million shares, representing 5.15% of the float (the number of shares available for trading by the public). This marks a 0.57% increase in short interest from the previous month. The short interest ratio (days to cover) is 2.8, indicating that it would take 2.8 days of the average trading volume of 2.05 million shares to cover all short positions.

Current Short Interest
10,560,000 shares
Previous Short Interest
10,500,000 shares
Change Vs. Previous Month
+0.57%
Dollar Volume Sold Short
$1.44 billion
Short Interest Ratio
2.8 Days to Cover
Last Record Date
August 31, 2025
Outstanding Shares
211,380,000 shares
Short Percent of Float
5.15%
Today's Trading Volume
1,448,238 shares
Average Trading Volume
2,054,275 shares
Today's Volume Vs. Average
70%
Short Selling Insmed?
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INSM Short Interest Over Time

INSM Days to Cover Over Time

INSM Percentage of Float Shorted Over Time

Insmed Short Interest History

Report DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date
8/31/202510,560,000 shares $1.44 billion +0.6%5.2%2.8 $136.10
8/15/202510,500,000 shares $1.34 billion +10.1%N/A2.7 $127.80
7/31/20259,540,000 shares $1.02 billion -1.6%4.7%2.6 $107.28
7/15/20259,690,000 shares $996.81 million -1.1%N/A2.6 $102.87
6/30/20259,800,000 shares $986.27 million -15.9%5.3%2.7 $100.64
6/15/202511,650,000 shares $1.15 billion -33.3%6.3%3.8 $98.73
5/31/202517,460,000 shares $1.22 billion +6.0%10.2%7 $69.97
5/15/202516,470,000 shares $1.11 billion +4.4%9.7%7.4 $67.22
4/30/202515,780,000 shares $1.14 billion +4.4%N/A7.2 $72.00
4/15/202515,120,000 shares $1.07 billion +4.3%8.9%7.1 $71.07
3/31/202514,500,000 shares $1.11 billion +0.2%8.5%7.3 $76.29
3/15/202514,470,000 shares $1.11 billion -1.0%8.5%7.8 $76.55
2/28/202514,620,000 shares $1.19 billion +1.1%8.6%7.6 $81.55
2/15/202514,460,000 shares $1.15 billion -0.6%8.5%7.9 $79.31
1/31/202514,540,000 shares $1.11 billion -3.6%N/A8.1 $76.58
1/15/202515,090,000 shares $1.06 billion -2.3%N/A8.8 $70.20
12/31/202415,440,000 shares $1.07 billion +18.7%N/A10 $69.04
12/15/202413,010,000 shares $931.91 million +3.1%N/A8.5 $71.63
11/30/202412,620,000 shares $948.52 million +4.3%N/A8.3 $75.16
11/15/202412,100,000 shares $802.11 million -12.6%N/A7.8 $66.29
10/31/202413,850,000 shares $931.83 million +1.1%N/A8.1 $67.28
10/15/202413,700,000 shares $1.02 billion +3.8%N/A7.8 $74.66
9/30/202413,200,000 shares $963.60 million +8.0%N/A6.7 $73.00
9/15/202412,220,000 shares $912.35 million -0.1%N/A5.4 $74.66
8/31/202412,230,000 shares $935.23 million -9.4%N/A4.9 $76.47
8/15/202413,500,000 shares $1.00 billion -1.4%N/A3.7 $74.14
7/31/202413,690,000 shares $995.95 million -7.9%N/A3.9 $72.75
7/15/202414,870,000 shares $1.15 billion +15.9%N/A4.2 $77.47
6/30/202412,830,000 shares $859.61 million +10.9%N/A3.7 $67.00
6/15/202411,570,000 shares $739.55 million +6.5%N/A3.5 $63.92
5/31/202410,860,000 shares $597.84 million +9.4%N/A3.6 $55.05
5/15/20249,930,000 shares $247.55 million +16.4%N/A5.6 $24.93
4/30/20248,530,000 shares $210.86 million -9.3%N/A4.8 $24.72
4/15/20249,400,000 shares $252.11 million +4.0%N/A5.5 $26.82
3/31/20249,040,000 shares $245.26 million +2.3%N/A5.4 $27.13
3/15/20248,840,000 shares $227.36 million +3.2%N/A5.5 $25.72
2/29/20248,570,000 shares $237.56 million -7.2%N/A5 $27.72
2/15/20249,230,000 shares $265.36 million -11.2%N/A5.4 $28.75
1/31/202410,390,000 shares $288.84 million +9.1%N/A6.6 $27.80
1/15/20249,520,000 shares $270.94 million -7.8%N/A6 $28.46
12/31/202310,320,000 shares $319.82 million -14.9%N/A7 $30.99
12/15/202312,130,000 shares $344.73 million No ChangeN/A8.5 $28.42
11/30/202312,130,000 shares $303.49 million -14.4%N/A9 $25.02
11/15/202314,170,000 shares $352.83 million -8.2%N/A10.1 $24.90
10/31/202315,440,000 shares $386.93 million +13.4%N/A11.1 $25.06
10/15/202313,620,000 shares $337.23 million +6.4%N/A9.7 $24.76
9/30/202312,800,000 shares $323.20 million -6.4%N/A9.5 $25.25
9/15/202313,680,000 shares $364.02 million +10.0%N/A10.6 $26.61
8/31/202312,440,000 shares $272.31 million +11.9%N/A10.1 $21.89
8/15/202311,120,000 shares $250.31 million +9.1%N/A10.4 $22.51
7/31/202310,190,000 shares $225.10 million +5.6%N/A9.8 $22.09
7/15/20239,650,000 shares $198.79 million +7.7%N/A9.8 $20.60
6/30/20238,960,000 shares $189.06 million -4.6%N/A9 $21.10
6/15/20239,390,000 shares $187.89 million +4.2%N/A8.9 $20.01
5/31/20239,010,000 shares $171.46 million -2.7%N/A8.1 $19.03
5/15/20239,260,000 shares $178.44 million +1.7%N/A7.8 $19.27
4/30/20239,110,000 shares $177.65 million -8.2%N/A7.5 $19.50
4/15/20239,920,000 shares $166.16 million -6.7%N/A8.3 $16.75
3/31/202310,630,000 shares $181.24 million -3.7%N/A8.6 $17.05
3/15/202311,040,000 shares $197.28 million +6.0%N/A8.6 $17.87
2/28/202310,420,000 shares $212.36 million -2.5%N/A8 $20.38
2/15/202310,690,000 shares $218.18 million -6.4%N/A8.2 $20.41
1/31/202311,420,000 shares $245.87 million +6.0%N/A8.6 $21.53
1/15/202310,770,000 shares $209.48 million +0.8%N/A6.9 $19.45
12/30/202210,690,000 shares $213.59 million +16.1%N/A6.9 $19.98
12/15/20229,210,000 shares $179.23 million +16.9%N/A6.4 $19.46
11/30/20227,880,000 shares $145.70 million +6.1%N/A5.7 $18.49
11/15/20227,430,000 shares $140.35 million -4.3%N/A5.4 $18.89
10/31/20227,760,000 shares $134.40 million -10.3%N/A5.7 $17.32
10/15/20228,650,000 shares $179.06 million +0.5%N/A6.5 $20.70
9/30/20228,610,000 shares $185.46 million +7.2%N/A7.7 $21.54
9/15/20228,030,000 shares $194.17 million +22.6%N/A6.9 $24.18
8/31/20226,550,000 shares $161.26 million -3.3%N/A5.6 $24.62
8/15/20226,770,000 shares $185.50 million -5.8%N/A5.9 $27.40
7/31/20227,190,000 shares $159.04 million -20.6%N/A5.9 $22.12
7/15/20229,060,000 shares $209.56 million -17.4%N/A7.8 $23.13
6/30/202210,970,000 shares $216.33 million -4.1%N/A9.6 $19.72
6/15/202211,440,000 shares $203.63 million +4.9%15.6%10.1 $17.80
5/31/202210,910,000 shares $205.33 million -0.9%N/A10.2 $18.82
5/15/202211,010,000 shares $200.27 million -2.6%N/A10.3 $18.19
4/30/202211,300,000 shares $248.26 million +0.9%N/A11.4 $21.97
4/15/202211,200,000 shares $287.28 million +10.0%N/A11.7 $25.65
3/31/202210,180,000 shares $239.23 million +1.4%N/A10.8 $23.50
3/15/202210,040,000 shares $218.77 million -2.1%N/A11.5 $21.79
2/28/202210,260,000 shares $245.21 million +2.9%N/A11.7 $23.90
2/15/20229,970,000 shares $242.17 million +9.0%N/A11.7 $24.29
1/31/20229,150,000 shares $207.52 million +29.8%N/A11.5 $22.68
1/15/20227,050,000 shares $167.30 million -0.3%N/A9.2 $23.73
12/31/20217,070,000 shares $192.59 million -4.6%N/A9.4 $27.24
12/15/20217,410,000 shares $207.70 million +3.6%N/A9.2 $28.03
11/30/20217,150,000 shares $196.77 million -0.4%N/A8.6 $27.52
11/15/20217,180,000 shares $218.99 million -3.8%N/A8.8 $30.50
10/29/20217,460,000 shares $224.92 million -18.7%N/A9.2 $30.15
10/15/20219,180,000 shares $243.18 million +4.1%8.2%11.8 $26.49
9/30/20218,820,000 shares $242.90 million +1.5%7.9%11.4 $27.54
9/15/20218,690,000 shares $240.19 million -15.8%7.8%12.2 $27.64
8/31/202110,320,000 shares $289.37 million +7.1%9.3%13.4 $28.04
8/13/20219,640,000 shares $227.12 million +5.5%8.7%11.9 $23.56
7/30/20219,140,000 shares $224.84 million +12.7%8.2%7.7 $24.60
7/15/20218,110,000 shares $222.94 million -1.5%7.4%6.9 $27.49
6/30/20218,230,000 shares $234.23 million +0.9%7.5%7.2 $28.46
6/15/20218,160,000 shares $239.17 million +5.4%7.4%6.9 $29.31
5/28/20217,740,000 shares $190.40 million -5.8%7.1%6.1 $24.60
5/14/20218,220,000 shares $209.45 million +7.0%N/A6.4 $25.48
4/30/20217,680,000 shares $268.03 million -12.1%N/A6.7 $34.90
4/15/20218,740,000 shares $288.59 million -0.6%N/A9.3 $33.02
3/31/20218,790,000 shares $283.74 million +2.5%N/A9 $32.28
3/15/20218,580,000 shares $335.56 million +6.7%N/A8.8 $39.11
2/26/20218,040,000 shares $298.77 million +0.3%N/A9.2 $37.16
2/12/20218,020,000 shares $323.53 million -5.1%N/A9.7 $40.34
1/29/20218,450,000 shares $316.62 million -6.9%N/A10 $37.47
1/15/20219,080,000 shares $339.32 million -1.0%N/A10.3 $37.37
12/31/20209,170,000 shares $311.60 million -4.3%N/A10.9 $33.98
12/15/20209,580,000 shares $382.29 million -7.7%N/A11.4 $39.91
11/30/202010,380,000 shares $413.12 million -9.7%N/A12 $39.80
11/15/202011,500,000 shares $415.61 million +5.8%N/A13.5 $36.14
10/30/202010,870,000 shares $344.25 million -7.3%N/A13 $31.67
10/15/202011,730,000 shares $415.24 million +4.0%N/A14.9 $35.40
9/30/202011,280,000 shares $362.54 million -2.8%N/A14.3 $32.14

INSM Short Interest - Frequently Asked Questions

What is Insmed's current short interest?

Short interest is the volume of Insmed shares that have been sold short but have not yet been covered or closed out. As of August 31st, traders have sold 10,560,000 shares of INSM short. 5.15% of Insmed's shares are currently sold short. Learn More on Insmed's current short interest.

What is a good short interest ratio for Insmed?

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. INSM shares currently have a short interest ratio of 3.0. Learn More on Insmed's short interest ratio.

Which institutional investors are shorting Insmed?

As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Insmed: Nomura Holdings Inc., Group One Trading LLC, Boothbay Fund Management LLC, Bank of America Corp DE, 683 Capital Management LLC, Jane Street Group LLC, Caption Management LLC, Volterra Technologies LP, Squarepoint Ops LLC, OCONNOR A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS LLC , Walleye Capital LLC, Walleye Trading LLC, Jefferies Financial Group Inc., JPMorgan Chase & Co., Garda Capital Partners LP, and Quaker Wealth Management LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission.

What is a good short interest percentage for Insmed?

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. 5.15% of Insmed's floating shares are currently sold short.

Is Insmed's short interest increasing or decreasing?

Insmed saw a increase in short interest in August. As of August 31st, there was short interest totaling 10,560,000 shares, an increase of 0.6% from the previous total of 10,500,000 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 Insmed's short interest compare to its competitors?

5.15% of Insmed's shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Insmed: Sanofi (0.21%), GSK PLC Sponsored ADR (0.55%), Takeda Pharmaceutical Co. (0.25%), argenex SE (3.01%), BeOne Medicines Ltd. - Sponsored ADR (1.37%), BioNTech SE Sponsored ADR (2.54%), Teva Pharmaceutical Industries Ltd. (4.43%), Genmab A/S Sponsored ADR (0.63%), Summit Therapeutics PLC (26.50%), Dr. Reddy's Laboratories Ltd (1.16%),

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 ($73.23 billion), Invesco QQQ ($29.52 billion), iShares Russell 2000 ETF ($20.82 billion), iShares 20+ Year Treasury Bond ETF ($10.76 billion), Palo Alto Networks, Inc. ($9.37 billion), Strategy Inc ($7.58 billion), Invesco S&P 500 Equal Weight ETF ($6.78 billion), SPDR S&P Biotech ETF ($6.72 billion), AppLovin Corporation ($6.37 billion), and iShares iBoxx $ Investment Grade Corporate Bond ETF ($6.29 billion). View all of the most shorted stocks.

What does it mean to sell short Insmed stock?

Short selling INSM is an investing strategy that aims to generate trading profit from Insmed as its price is falling. INSM shares are trading down $0.07 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 Insmed?

A short squeeze for Insmed 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 INSM, which in turn drives the price of the stock up even further.

How often is Insmed'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 INSM, twice per month. The most recent reporting period available is August, 31 2025.




This page (NASDAQ:INSM) was last updated on 9/16/2025 by MarketBeat.com Staff
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