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Alnylam Pharmaceuticals (ALNY) Short Interest Ratio & Short Volume

Alnylam Pharmaceuticals logo
$289.00 -3.58 (-1.22%)
Closing price 04:00 PM Eastern
Extended Trading
$285.50 -3.50 (-1.21%)
As of 04:12 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.

Alnylam Pharmaceuticals Short Interest Data

Alnylam Pharmaceuticals (ALNY) has a short interest of 3.15 million shares. This marks a 2.94% increase in short interest from the previous month. The short interest ratio (days to cover) is 3.3, indicating that it would take 3.3 days of the average trading volume of 915,989 shares to cover all short positions.

Current Short Interest
3,150,000 shares
Previous Short Interest
3,060,000 shares
Change Vs. Previous Month
+2.94%
Dollar Volume Sold Short
$829.21 million
Short Interest Ratio
3.3 Days to Cover
Last Record Date
April 30, 2025
Outstanding Shares
130,388,000 shares
Percentage of Shares Shorted
2.42%
Today's Trading Volume
614,991 shares
Average Trading Volume
915,989 shares
Today's Volume Vs. Average
67%
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ALNY Short Interest Over Time

ALNY Days to Cover Over Time

ALNY Percentage of Float Shorted Over Time

Alnylam Pharmaceuticals Short Interest History

Report DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date
4/30/20253,150,000 shares $829.21 million +2.9%N/A3.3 $263.24
4/15/20253,060,000 shares $706.65 million +2.3%2.4%3.4 $230.93
3/31/20252,990,000 shares $807.36 million +17.7%2.3%3.5 $270.02
3/15/20252,540,000 shares $614.07 million +2.0%2.0%3.4 $241.76
2/28/20252,490,000 shares $614.41 million -22.7%2.0%3.7 $246.75
2/15/20253,220,000 shares $825.77 million +9.5%2.5%4.8 $256.45
1/31/20252,940,000 shares $797.65 million -6.7%N/A4.2 $271.31
1/15/20253,150,000 shares $790.68 million -6.0%N/A4.2 $251.01
12/31/20243,350,000 shares $788.29 million -4.0%N/A4.4 $235.31
12/15/20243,490,000 shares $856.59 million +3.0%N/A4.5 $245.44
11/30/20243,390,000 shares $857.91 million -9.4%N/A4.4 $253.07
11/15/20243,740,000 shares $880.99 million +1.1%N/A4.3 $235.56
10/31/20243,700,000 shares $986.38 million -23.6%N/A4.6 $266.59
10/15/20244,840,000 shares $1.39 billion +7.3%N/A5.8 $287.36
9/30/20244,510,000 shares $1.24 billion +1.4%N/A5.5 $275.03
9/15/20244,450,000 shares $1.18 billion +18.0%N/A3.8 $265.27
8/31/20243,770,000 shares $990.34 million -16.6%N/A3.1 $262.69
8/15/20244,520,000 shares $1.19 billion +4.4%N/A4 $262.70
7/31/20244,330,000 shares $1.03 billion -3.6%N/A4 $237.46
7/15/20244,490,000 shares $1.15 billion +22.0%N/A4.5 $256.18
6/30/20243,680,000 shares $894.24 million +72.8%N/A3.9 $243.00
6/15/20242,130,000 shares $341.63 million -14.1%N/A2.6 $160.39
5/31/20242,480,000 shares $368.11 million -2.4%N/A4.4 $148.43
5/15/20242,540,000 shares $374.40 million -3.4%N/A4.3 $147.40
4/30/20242,630,000 shares $378.59 million +5.2%N/A3.2 $143.95
4/15/20242,500,000 shares $369.25 million -10.7%N/A3 $147.70
3/31/20242,800,000 shares $418.46 million +4.1%N/A3.3 $149.45
3/15/20242,690,000 shares $401.54 million -11.5%N/A3.2 $149.27
2/29/20243,040,000 shares $459.31 million -23.8%N/A3.6 $151.09
2/15/20243,990,000 shares $588.25 million -0.5%N/A5 $147.43
1/31/20244,010,000 shares $693.37 million -7.4%N/A6.5 $172.91
1/15/20244,330,000 shares $837.38 million -8.5%N/A7.4 $193.39
12/31/20234,730,000 shares $905.37 million -5.2%N/A7.6 $191.41
12/15/20234,990,000 shares $924.35 million -2.0%N/A7.8 $185.24
11/30/20235,090,000 shares $856.39 million -1.9%N/A7.6 $168.25
11/15/20235,190,000 shares $887.75 million -1.5%N/A8 $171.05
10/31/20235,270,000 shares $799.99 million -1.7%N/A8.3 $151.80
10/15/20235,360,000 shares $901.12 million +3.9%N/A8.7 $168.12
9/30/20235,160,000 shares $913.84 million +0.2%N/A8.6 $177.10
9/15/20235,150,000 shares $952.70 million -2.8%N/A9 $184.99
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8/31/20235,300,000 shares $1.05 billion -1.5%N/A9.9 $197.82
8/15/20235,380,000 shares $969.10 million +1.7%N/A10.2 $180.13
7/31/20235,290,000 shares $1.03 billion +6.9%N/A9.7 $195.40
7/15/20234,950,000 shares $975.65 million -0.6%N/A8.4 $197.10
6/30/20234,980,000 shares $945.90 million +0.4%N/A8 $189.94
6/15/20234,960,000 shares $1.00 billion -1.8%N/A7.4 $202.34
5/31/20235,050,000 shares $934.30 million -1.4%N/A7 $185.01
5/15/20235,120,000 shares $1.06 billion +0.8%N/A6.3 $206.20
4/30/20235,080,000 shares $1.01 billion +2.2%N/A6.2 $199.20
4/15/20234,970,000 shares $1.01 billion -4.1%N/A6 $203.92
3/31/20235,180,000 shares $1.04 billion +5.1%N/A6.4 $200.32
3/15/20234,930,000 shares $915.75 million -8.5%N/A6.3 $185.75
2/28/20235,390,000 shares $1.03 billion +5.7%N/A7 $191.45
2/15/20235,100,000 shares $1.13 billion -4.3%N/A6.5 $222.10
1/31/20235,330,000 shares $1.21 billion -6.2%N/A7.1 $226.40
1/15/20235,680,000 shares $1.34 billion +11.2%N/A7.3 $235.53
12/30/20225,110,000 shares $1.21 billion -5.4%N/A6.2 $237.65
12/15/20225,400,000 shares $1.24 billion +8.2%N/A6.1 $229.37
11/30/20224,990,000 shares $1.10 billion -10.3%N/A5.1 $220.59
11/15/20225,560,000 shares $1.19 billion -7.8%N/A5.7 $214.29
10/31/20226,030,000 shares $1.25 billion +25.6%N/A6.1 $207.26
10/15/20224,800,000 shares $890.54 million +5.7%N/A4.2 $185.53
9/30/20224,540,000 shares $908.73 million +3.7%N/A4.2 $200.16
9/15/20224,380,000 shares $913.14 million +4.3%N/A4.2 $208.48
8/31/20224,200,000 shares $868.01 million -16.0%N/A4 $206.67
8/15/20225,000,000 shares $1.16 billion +1.4%N/A5.2 $231.01
7/31/20224,930,000 shares $700.26 million -1.2%N/A4.9 $142.04
7/15/20224,990,000 shares $725.50 million +4.2%N/A5.8 $145.39
6/30/20224,790,000 shares $698.62 million +1.1%N/A5.5 $145.85
6/15/20224,740,000 shares $642.03 million -15.7%5.0%5.4 $135.45
5/31/20225,620,000 shares $707.00 million -4.1%N/A6.8 $125.80
5/15/20225,860,000 shares $741.11 million -1.0%N/A6.7 $126.47
4/30/20225,920,000 shares $789.91 million +2.3%N/A7 $133.43
4/15/20225,790,000 shares $968.90 million +11.8%N/A7.1 $167.34
3/31/20225,180,000 shares $845.84 million +9.5%N/A6.4 $163.29
3/15/20224,730,000 shares $723.31 million +3.7%N/A5.4 $152.92
2/28/20224,560,000 shares $719.80 million +3.9%N/A5.2 $157.85
2/15/20224,390,000 shares $672.99 million +8.1%N/A5.3 $153.30
1/31/20224,060,000 shares $558.66 million +2.8%3.6%5.1 $137.60
1/15/20223,950,000 shares $586.58 million +11.9%N/A4.8 $148.50
12/31/20213,530,000 shares $598.62 million -6.1%N/A4.6 $169.58
12/15/20213,760,000 shares $718.39 million -4.8%N/A5.1 $191.06
11/30/20213,950,000 shares $726.01 million -2.5%N/A6.5 $183.80
11/15/20214,050,000 shares $701.91 million +4.9%N/A6.8 $173.31
10/29/20213,860,000 shares $615.90 million -0.5%N/A6.4 $159.56
10/15/20213,880,000 shares $809.21 million -3.2%N/A7.1 $208.56
9/30/20214,010,000 shares $757.13 million -9.3%N/A6.7 $188.81
9/15/20214,420,000 shares $828.66 million -8.5%N/A7 $187.48
8/31/20214,830,000 shares $972.91 million -3.6%N/A7.2 $201.43
8/13/20215,010,000 shares $984.67 million -1.0%N/A7.3 $196.54
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7/30/20215,060,000 shares $905.44 million +19.9%N/A7.7 $178.94
7/15/20214,220,000 shares $725.63 million -2.3%3.6%6.8 $171.95
6/30/20214,320,000 shares $732.33 million -6.7%3.7%7.2 $169.52
6/15/20214,630,000 shares $770.90 million +9.2%4.0%8.7 $166.50
5/28/20214,240,000 shares $602.04 million -6.2%3.7%8.6 $141.99
5/14/20214,520,000 shares $600.80 million +9.4%N/A9.1 $132.92
4/30/20214,130,000 shares $576.92 million +0.7%N/A7.7 $139.69
4/15/20214,100,000 shares $567.07 million +12.3%N/A7 $138.31
3/31/20213,650,000 shares $493.22 million -1.9%N/A5.3 $135.13
3/15/20213,720,000 shares $528.98 million +0.5%N/A5.2 $142.20
2/26/20213,700,000 shares $542.38 million +5.1%N/A5.4 $146.59
2/12/20213,520,000 shares $582.14 million -4.9%N/A5.2 $165.38
1/29/20213,700,000 shares $572.54 million -4.4%N/A5.4 $154.74
1/15/20213,870,000 shares $638.82 million +10.9%N/A5.9 $165.07
12/31/20203,490,000 shares $457.33 million -4.6%N/A6.4 $131.04
12/15/20203,660,000 shares $485.65 million -3.2%N/A7.2 $132.69
11/30/20203,780,000 shares $490.87 million +1.3%N/A7.4 $129.86
11/15/20203,730,000 shares $505.45 million +3.9%N/A7.2 $135.51
10/30/20203,590,000 shares $442.72 million +5.9%N/A7.5 $123.32
10/15/20203,390,000 shares $487.85 million +4.0%N/A7.3 $143.91
9/30/20203,260,000 shares $474.66 million -9.2%N/A6.6 $145.60
9/15/20203,590,000 shares $468.53 million -10.7%N/A6.2 $130.51
8/31/20204,020,000 shares $533.21 million -5.6%N/A6.1 $132.64
8/14/20204,260,000 shares $579.96 million No ChangeN/A6.2 $136.14
7/31/20204,260,000 shares $620.94 million -9.9%N/A5.7 $145.76
7/15/20204,730,000 shares $747.43 million -13.1%N/A5.8 $158.02
6/30/20205,440,000 shares $804.63 million -7.0%N/A6.2 $147.91
6/15/20205,850,000 shares $751.02 million +11.9%N/A6.9 $128.38
5/29/20205,230,000 shares $707.46 million +0.6%N/A6.1 $135.27

ALNY Short Interest - Frequently Asked Questions

What is Alnylam Pharmaceuticals' current short interest?

Short interest is the volume of Alnylam Pharmaceuticals shares that have been sold short but have not yet been covered or closed out. As of April 30th, traders have sold 3,150,000 shares of ALNY short. Learn More on Alnylam Pharmaceuticals' current short interest.

What is a good short interest ratio for Alnylam Pharmaceuticals?

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. ALNY shares currently have a short interest ratio of 3.0. Learn More on Alnylam Pharmaceuticals's short interest ratio.

Which institutional investors are shorting Alnylam Pharmaceuticals?

As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Alnylam Pharmaceuticals: Jane Street Group LLC, Goldman Sachs Group Inc., Parallax Volatility Advisers L.P., Millennium Management LLC, 683 Capital Management LLC, Twin Tree Management LP, Kingdon Capital Management L.L.C., PEAK6 LLC, Jane Street Group LLC, Walleye Trading LLC, Walleye Capital LLC, Garda Capital Partners LP, Altium Capital Management LLC, Persistent Asset Partners Ltd, Arrowpoint Investment Partners Singapore Pte. Ltd., Simplex Trading LLC, JPMorgan Chase & Co., Wolverine Asset Management LLC, and Portman Square Capital LLP. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission.

Is Alnylam Pharmaceuticals' short interest increasing or decreasing?

Alnylam Pharmaceuticals saw a increase in short interest in the month of April. As of April 30th, there was short interest totaling 3,150,000 shares, an increase of 2.9% from the previous total of 3,060,000 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 Alnylam Pharmaceuticals' short interest compare to its competitors?

Here is how the short interest of companies in the industry of "biotechnology" compare to Alnylam Pharmaceuticals: Gilead Sciences, Inc. (1.90%), Vertex Pharmaceuticals Incorporated (1.48%), Regeneron Pharmaceuticals, Inc. (2.78%), Biogen Inc. (2.18%), United Therapeutics Co. (4.45%), Neurocrine Biosciences, Inc. (4.54%), Incyte Co. (3.36%), BioMarin Pharmaceutical Inc. (2.35%), Exelixis, Inc. (7.20%), Exact Sciences Co. (5.36%),

Which stocks are the most shorted right now?

As of the most recent reporting period, the following stocks had the largest short interest positions: Spotify Technology S.A. ($4.67 billion), Charter Communications, Inc. ($4.58 billion), Capital One Financial Co. ($4.47 billion), The Kroger Co. ($2.56 billion), Reddit, Inc. ($2.23 billion), Rivian Automotive, Inc. ($2.16 billion), Live Nation Entertainment, Inc. ($1.90 billion), SoFi Technologies, Inc. ($1.85 billion), Zscaler, Inc. ($1.75 billion), and Omnicom Group Inc. ($1.75 billion). View all of the most shorted stocks.

What does it mean to sell short Alnylam Pharmaceuticals stock?

Short selling ALNY is an investing strategy that aims to generate trading profit from Alnylam Pharmaceuticals as its price is falling. ALNY shares are trading down $3.58 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 Alnylam Pharmaceuticals?

A short squeeze for Alnylam Pharmaceuticals occurs when it has a large amount of short interest and its stock appreciates in price. This forces short sellers to cover their short interest positions by buying actual shares of ALNY, which in turn drives the price of the stock up even further.

How often is Alnylam Pharmaceuticals' 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 ALNY, twice per month. The most recent reporting period available is April, 30 2025.




This page (NASDAQ:ALNY) was last updated on 5/22/2025 by MarketBeat.com Staff
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