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Illumina (ILMN) Short Interest Ratio & Short Volume

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$218.22 -3.44 (-1.55%)
As of 09/4/2026 04:00 PM Eastern
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Illumina Short Interest Overview

As of August 14, 2026, Illumina (ILMN) had a short interest of 9.46 million shares sold short, representing 6.46% of the public float. This marks a 17.48% increase in short interest since the prior report. The short interest ratio (days to cover) is 4.8, meaning it would take 4.8 days of the average trading volume of 1.69 million shares to cover all short positions.

Current Short Interest
9,464,776 shares
Previous Short Interest
8,056,689 shares
Change Vs. Previous Month
17.48%
Dollar Volume Sold Short
$1.81 billion
Short Interest Ratio
4.8 Days to Cover
Last Record Date
August 14, 2026
Outstanding Shares
151,000,000 shares
Short Percent of Float
6.46%
Today's Trading Volume
1,728,019 shares
Average Trading Volume
1,689,726 shares
Today's Volume Vs. Average
102%
Short Selling Illumina?
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

ILMN Short Interest Over Time

ILMN Days to Cover Over Time

ILMN Percentage of Float Shorted Over Time

Illumina Tesla Short Interest History & Recent Changes

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Report DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date
8/14/20269,464,776 shares $1.81 billion +17.5%6.5%4.83 $190.89
7/31/20268,056,689 shares $1.65 billion -8.0%5.5%4.51 $205.10
7/15/20268,752,414 shares $1.64 billion +15.7%6.0%4.39 $187.15
6/30/20267,565,780 shares $1.33 billion -17.8%5.1%3.68 $175.83
6/15/20269,207,473 shares $1.54 billion +19.2%6.3%4.53 $166.89
5/29/20267,723,045 shares $1.26 billion +2.9%5.3%4.67 $162.96
5/15/20267,503,141 shares $1.07 billion +14.6%5.1%4.02 $142.54
4/30/20266,546,522 shares $829.71 million -8.8%4.5%4.68 $126.74
4/15/20267,178,290 shares $949.40 million +3.2%4.9%5.22 $132.26
3/31/20266,955,511 shares $857.34 million -3.8%4.7%4.87 $123.26
3/13/20267,230,669 shares $860.02 million +0.9%4.7%4.51 $118.94
2/27/20267,164,759 shares $963.37 million -9.6%4.7%2.94 $134.46
2/13/20267,921,867 shares $925.35 million -4.6%5.4%2.97 $116.81
1/30/20268,300,465 shares $1.20 billion +28.6%5.4%3.96 $144.81
1/15/20266,455,325 shares $937.96 million -5.2%4.2%3.39 $145.30
12/31/20256,807,201 shares $892.83 million -8.2%4.5%4.75 $131.16
12/15/20257,411,422 shares $999.95 million +5.0%4.9%4.8 $134.92
11/28/20257,055,985 shares $927.09 million +7.8%4.6%3.84 $131.39
11/14/20256,544,061 shares $789.67 million -2.7%4.4%3.49 $120.67
10/31/20256,726,492 shares $831.66 million +0.7%4.5%3.43 $123.64
10/15/20256,680,000 shares $621.24 million +1.1%4.4%4 $93.00
9/30/20256,610,000 shares $627.75 million -10.0%N/A3.7 $94.97
9/15/20257,340,000 shares $740.75 million +1.7%N/A3.8 $100.92
8/31/20257,220,000 shares $721.71 million -4.0%4.8%3.6 $99.96
8/15/20257,520,000 shares $752.83 million -2.7%N/A3.5 $100.11
7/31/20257,730,000 shares $793.95 million -2.0%5.2%3.3 $102.71
7/15/20257,890,000 shares $766.51 million +12.9%N/A3.6 $97.15
6/30/20256,990,000 shares $666.92 million +11.0%4.5%3 $95.41
6/15/20256,300,000 shares $547.66 million +15.0%4.1%2.8 $86.93
5/31/20255,480,000 shares $445.91 million -10.2%3.5%2.4 $81.37
5/15/20256,100,000 shares $493.49 million +9.7%3.9%2.6 $80.90
4/30/20255,560,000 shares $431.46 million +1.1%N/A2.1 $77.60
4/15/20255,500,000 shares $410.25 million -2.8%3.5%2 $74.59
3/31/20255,660,000 shares $449.06 million -3.1%3.6%2.1 $79.34
3/15/20255,840,000 shares $499.90 million -10.3%3.7%2.3 $85.60
2/28/20256,510,000 shares $577.70 million +1.1%4.1%2.6 $88.74
2/15/20256,440,000 shares $645.55 million -1.1%4.1%2.7 $100.24
1/31/20256,510,000 shares $864.14 million +9.1%N/A2.9 $132.74
1/15/20255,970,000 shares $813.05 million +18.5%N/A3 $136.19
12/31/20245,040,000 shares $673.50 million -22.6%N/A2.5 $133.63
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12/15/20246,510,000 shares $936.59 million -9.7%N/A3.1 $143.87
11/30/20247,210,000 shares $1.04 billion +10.2%N/A3.8 $144.15
11/15/20246,540,000 shares $883.23 million -2.7%N/A3.5 $135.05
10/31/20246,720,000 shares $968.62 million -0.9%N/A3.9 $144.14
10/15/20246,780,000 shares $1.00 billion +23.3%N/A3.9 $147.61
9/30/20245,500,000 shares $717.26 million +12.7%N/A3.2 $130.41
9/15/20244,880,000 shares $630.40 million +9.2%N/A2.7 $129.18
8/31/20244,470,000 shares $587.36 million +6.2%N/A1.8 $131.40
8/15/20244,210,000 shares $542.25 million -9.7%N/A1.6 $128.80
7/31/20244,660,000 shares $571.32 million -2.5%N/A1.8 $122.60
7/15/20244,780,000 shares $557.16 million -4.8%N/A1.8 $116.56
6/30/20245,020,000 shares $523.99 million -2.3%N/A2 $104.38
6/15/20245,140,000 shares $558.51 million -11.7%N/A2.1 $108.66
5/31/20245,820,000 shares $606.91 million +7.8%N/A3.1 $104.28
5/15/20245,400,000 shares $621.05 million +13.5%N/A3.4 $115.01
4/30/20244,760,000 shares $585.72 million -9.7%N/A2.8 $123.05
4/15/20245,270,000 shares $638.51 million -0.2%N/A3.2 $121.16
3/31/20245,280,000 shares $725.05 million +1.3%N/A3 $137.32
3/15/20245,210,000 shares $665.47 million +5.3%N/A2.9 $127.73
2/29/20244,950,000 shares $692.16 million +3.3%N/A2.5 $139.83
2/15/20244,790,000 shares $699.68 million +2.6%N/A2.2 $146.07
1/31/20244,670,000 shares $667.86 million +0.4%N/A1.8 $143.01
1/15/20244,650,000 shares $641.89 million +9.2%N/A1.7 $138.04
12/31/20234,260,000 shares $593.16 million +5.7%N/A1.6 $139.24
12/15/20234,030,000 shares $512.21 million -19.2%N/A1.6 $127.10
11/30/20234,990,000 shares $508.73 million -7.9%N/A2 $101.95
11/15/20235,420,000 shares $542.92 million +4.6%N/A2.4 $100.17
10/31/20235,180,000 shares $566.80 million -5.7%N/A3.1 $109.42
10/15/20235,490,000 shares $708.81 million -2.7%N/A3.5 $129.11
9/30/20235,640,000 shares $774.26 million -5.2%N/A3.5 $137.28
9/15/20235,950,000 shares $869.59 million +5.5%N/A3.8 $146.15
8/31/20235,640,000 shares $931.84 million -2.6%N/A3.6 $165.22
8/15/20235,790,000 shares $1.02 billion -3.2%N/A3.7 $176.02
7/31/20235,980,000 shares $1.15 billion -16.4%N/A3.9 $192.15
7/15/20237,150,000 shares $1.34 billion +3.3%N/A4.7 $187.15
6/30/20236,920,000 shares $1.30 billion +23.8%N/A5 $187.49
6/15/20235,590,000 shares $1.17 billion +12.0%N/A4.2 $209.94
5/31/20234,990,000 shares $981.28 million +16.1%N/A4 $196.65
5/15/20234,300,000 shares $880.86 million -4.2%N/A3.5 $204.85
4/30/20234,490,000 shares $922.96 million -2.4%N/A3.6 $205.56
4/15/20234,600,000 shares $1.05 billion +1.3%N/A3.8 $228.01
3/31/20234,540,000 shares $1.06 billion -7.5%N/A3.4 $232.55
3/15/20234,910,000 shares $1.12 billion +13.1%N/A3.7 $228.15
2/28/20234,340,000 shares $864.53 million +6.1%N/A3.4 $199.20
2/15/20234,090,000 shares $875.46 million +4.6%N/A3.3 $214.05
1/31/20233,910,000 shares $837.52 million +2.6%N/A3.2 $214.20
1/15/20233,810,000 shares $766.23 million -1.0%N/A2.9 $201.11
12/30/20223,850,000 shares $778.47 million -4.0%N/A3 $202.20
12/15/20224,010,000 shares $831.91 million -5.2%N/A2.7 $207.46
11/30/20224,230,000 shares $922.48 million -3.2%N/A2.8 $218.08
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11/15/20224,370,000 shares $1.04 billion -9.3%N/A2.7 $238.49
10/31/20224,820,000 shares $1.10 billion -3.2%N/A2.7 $228.82
10/15/20224,980,000 shares $992.61 million +15.0%N/A2.9 $199.32
9/30/20224,330,000 shares $826.12 million -0.9%N/A2.6 $190.79
9/15/20224,370,000 shares $882.61 million +0.2%N/A2.9 $201.97
8/31/20224,360,000 shares $879.15 million +24.6%N/A2.7 $201.64
8/15/20223,500,000 shares $793.07 million +17.5%N/A2.3 $226.59
7/31/20222,980,000 shares $645.71 million -16.5%N/A2.1 $216.68
7/15/20223,570,000 shares $675.48 million -7.8%N/A2.5 $189.21
6/30/20223,870,000 shares $713.47 million +12.8%N/A2.9 $184.36
6/15/20223,430,000 shares $664.15 million +38.9%N/A2.7 $193.63
5/31/20222,470,000 shares $591.52 million +22.3%N/A2.4 $239.48
5/15/20222,020,000 shares $471.79 million +9.2%N/A2.1 $233.56
4/30/20221,850,000 shares $548.80 million +16.4%N/A2.1 $296.65
4/15/20221,590,000 shares $535.02 million -3.1%N/A1.9 $336.49
3/31/20221,640,000 shares $573.02 million -4.1%N/A1.7 $349.40
3/15/20221,710,000 shares $534.56 million -2.3%N/A1.8 $312.61
2/28/20221,750,000 shares $571.55 million +6.7%N/A1.7 $326.60
2/15/20221,640,000 shares $561.08 million +3.8%N/A1.5 $342.12
1/31/20221,580,000 shares $551.14 million -11.2%N/A1.5 $348.82
1/15/20221,780,000 shares $721.15 million +4.7%N/A1.8 $405.14
12/31/20211,700,000 shares $646.75 million -0.6%N/A1.8 $380.44
12/15/20211,710,000 shares $669.88 million -5.5%N/A1.8 $391.74
11/30/20211,810,000 shares $661.25 million +4.6%N/A2.1 $365.33
11/15/20211,730,000 shares $655.57 million -16.4%N/A2.1 $378.94
10/29/20212,070,000 shares $859.17 million +12.5%N/A2.5 $415.06
10/15/20211,840,000 shares $754.27 million -12.0%N/A2.3 $409.93
9/30/20212,090,000 shares $847.72 million -14.0%N/A2.7 $405.61
9/15/20212,430,000 shares $1.09 billion +11.0%N/A3.5 $449.88

ILMN Short Interest - Frequently Asked Questions

Short interest is the volume of Illumina shares that have been sold short but have not yet been covered or closed out. As of August 14th, investors have sold 9,464,776 shares of ILMN short. 6.46% of Illumina's shares are currently sold short. Learn More on Illumina's current short interest.

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. ILMN shares currently have a short interest ratio of 4.8. Learn More on Illumina's short interest ratio.

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. 6.46% of Illumina's floating shares are currently sold short.

Illumina saw a increase in short interest in August. As of August 14th, there was short interest totaling 9,464,776 shares, an increase of 17.5% from the previous total of 8,056,689 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.

6.46% of Illumina's shares are currently sold short. Here is how the short interest of companies in the industry of "life sciences tools & services" compare to Illumina: Qiagen N.V. (5.41%), Thermo Fisher Scientific Inc. (1.29%), Agilent Technologies, Inc. (1.83%), IQVIA Holdings Inc. (2.63%), Waters Corporation (3.71%), Mettler-Toledo International, Inc. (3.62%), Medpace Holdings, Inc. (7.11%), Revvity Inc. (5.80%), Charles River Laboratories International, Inc. (5.01%), Icon Plc (5.18%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($71.57 billion), Invesco QQQ ($46.97 billion), iShares Russell 2000 ETF ($24.02 billion), Nebius Group N.V. ($15.37 billion), Sandisk Corporation ($12.60 billion), SPDR S&P Biotech ETF ($12.14 billion), Western Digital Corporation ($10.32 billion), iShares 20+ Year Treasury Bond ETF ($8.38 billion), VanEck Semiconductor ETF ($7.62 billion), and iShares iBoxx $ High Yield Corporate Bond ETF ($7.07 billion). View all of the most shorted stocks.

Short selling ILMN is an investing strategy that aims to generate trading profit from Illumina as its price is falling. ILMN shares are trading down $3.44 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.

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

Short interest is typically published by a stock exchange once per month. However, NASDAQ publishes a report for U.S. stocks, including ILMN, twice per month. The most recent reporting period available is August, 14 2026.

Understanding short interest metrics can help you assess how traders are positioning around a stock like ILMN:

  • Shares Sold Short: The total number of shares that have been sold by short sellers but have not yet been covered or closed out. A high number may indicate bearish sentiment.
  • Short Float: The percentage of a company’s publicly available shares (or "float") that are sold short. A higher short float suggests a greater portion of the stock is being bet against.
  • Days to Cover (Short Interest Ratio): This estimates how many days it would take short sellers to cover their positions, based on average daily trading volume. Higher values can signal potential for a short squeeze if buying pressure increases.

These metrics are often used by traders to gauge sentiment, volatility risk, and the potential for price movements based on short covering activity.


Related Companies
Short Interest Tools

Short interest data for NASDAQ:ILMN is sourced from the Financial Industry Regulatory Authority (FINRA), with the most recent report published on 8/25/2026. FINRA publishes updated short interest twice a month.
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