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Alnylam Pharmaceuticals (ALNY) Short Interest Ratio & Short Volume

Alnylam Pharmaceuticals logo
$446.51 -5.82 (-1.29%)
Closing price 08/29/2025 04:00 PM Eastern
Extended Trading
$446.62 +0.11 (+0.02%)
As of 08/29/2025 05:37 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 3.24 million shares, representing 2.51% of the float (the number of shares available for trading by the public). This marks a -4.14% decrease in short interest from the previous month. The short interest ratio (days to cover) is 3.2, indicating that it would take 3.2 days of the average trading volume of 1.19 million shares to cover all short positions.

Current Short Interest
3,240,000 shares
Previous Short Interest
3,380,000 shares
Change Vs. Previous Month
-4.14%
Dollar Volume Sold Short
$1.27 billion
Short Interest Ratio
3.2 Days to Cover
Last Record Date
July 31, 2025
Outstanding Shares
131,080,000 shares
Short Percent of Float
2.51%
Today's Trading Volume
827,614 shares
Average Trading Volume
1,190,821 shares
Today's Volume Vs. Average
69%
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Skip Charts & View Short Interest History

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
7/31/20253,240,000 shares $1.27 billion -4.1%2.5%3.2 $392.24
7/15/20253,380,000 shares $1.05 billion +1.5%N/A3.6 $311.12
6/30/20253,330,000 shares $1.09 billion -1.5%2.6%3.4 $326.09
6/15/20253,380,000 shares $1.04 billion -2.0%2.6%3.4 $307.99
5/31/20253,450,000 shares $1.05 billion -6.3%2.7%3.3 $304.59
5/15/20253,680,000 shares $1.04 billion +16.8%2.9%3.7 $283.40
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
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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
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
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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
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

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 July 31st, investors have sold 3,240,000 shares of ALNY short. 2.51% of Alnylam Pharmaceuticals' shares are currently sold 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: LMR Partners LLP, Group One Trading LLC, 683 Capital Management LLC, Jane Street Group LLC, Volterra Technologies LP, Diadema Partners LP, Qube Research & Technologies Ltd, Walleye Capital LLC, Walleye Trading LLC, Arrowpoint Investment Partners Singapore Pte. Ltd., JPMorgan Chase & Co., Persistent Asset Partners Ltd, Garda Capital Partners LP, Mirae Asset Securities USA Inc., Portman Square Capital LLP, and Twin Tree Management LP. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission.

What is a good short interest percentage for Alnylam Pharmaceuticals?

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. 2.51% of Alnylam Pharmaceuticals' floating shares are currently sold short.

Is Alnylam Pharmaceuticals' short interest increasing or decreasing?

Alnylam Pharmaceuticals saw a decrease in short interest in the month of July. As of July 31st, there was short interest totaling 3,240,000 shares, a decrease of 4.1% from the previous total of 3,380,000 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?

2.51% of Alnylam Pharmaceuticals' shares are currently sold short. Here is how the short interest of companies in the industry of "biotechnology" compare to Alnylam Pharmaceuticals: Amgen Inc. (2.33%), Gilead Sciences, Inc. (1.61%), Vertex Pharmaceuticals Incorporated (1.71%), Regeneron Pharmaceuticals, Inc. (2.24%), Biogen Inc. (2.71%), Incyte Corporation (3.85%), United Therapeutics Corporation (3.56%), Neurocrine Biosciences, Inc. (3.02%), BioMarin Pharmaceutical Inc. (2.71%), Exelixis, Inc. (6.67%),

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 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 $5.82 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 July, 31 2025.




This page (NASDAQ:ALNY) was last updated on 9/1/2025 by MarketBeat.com Staff
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