Ciena (CIEN) Short Interest Ratio & Short Volume $92.05 +1.18 (+1.30%) Closing price 03:59 PM EasternExtended Trading$91.69 -0.36 (-0.39%) As of 04:37 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. Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Ciena Short Interest DataCiena (CIEN) has a short interest of 5.74 million shares, representing 4.13% of the float (the number of shares available for trading by the public). This marks a 5.71% increase in short interest from the previous month. The short interest ratio (days to cover) is 2.7, indicating that it would take 2.7 days of the average trading volume of 2.28 million shares to cover all short positions.Current Short Interest5,740,000 sharesPrevious Short Interest5,430,000 sharesChange Vs. Previous Month+5.71%Dollar Volume Sold Short$533.47 millionShort Interest Ratio2.7 Days to CoverLast Record DateJuly 31, 2025Outstanding Shares141,370,000 sharesFloat Size139,140,000 sharesShort Percent of Float4.13%Today's Trading Volume1,068,561 sharesAverage Trading Volume2,275,913 sharesToday's Volume Vs. Average47% Short Selling Ciena? Sign up to receive the latest short interest report for Ciena and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartCIEN Short Interest Over TimeCIEN Days to Cover Over TimeCIEN Percentage of Float Shorted Over Time Ciena Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 7/31/20255,740,000 shares $533.47 million +5.7%4.1%2.7 $92.94 7/15/20255,430,000 shares $448.68 million -12.1%3.9%2.6 $82.63 6/30/20256,180,000 shares $502.68 million +26.9%4.5%2.9 $81.34 6/15/20254,870,000 shares $351.57 million +29.5%3.5%2.2 $72.19 5/31/20253,760,000 shares $300.72 million -3.6%2.7%1.6 $79.98 5/15/20253,900,000 shares $311.06 million -7.1%2.8%1.8 $79.76 4/30/20254,200,000 shares $281.57 million -6.5%3.0%1.8 $67.04 4/15/20254,490,000 shares $266.71 million +13.4%3.2%1.7 $59.40 3/31/20253,960,000 shares $239.31 million -5.7%2.8%1.5 $60.43 3/15/20254,200,000 shares $268.12 million +11.7%3.0%1.7 $63.84 Get the Latest News and Ratings for CIEN and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Ciena and its competitors with MarketBeat's FREE daily newsletter. 2/28/20253,760,000 shares $298.87 million -4.6%2.7%1.4 $79.49 2/15/20253,940,000 shares $352.42 million -19.4%2.8%1.7 $89.45 1/31/20254,890,000 shares $426.39 million -11.3%3.5%2.1 $87.20 1/15/20255,510,000 shares $473.14 million +19.3%4.0%2.6 $85.87 12/31/20244,620,000 shares $391.82 million -25.0%3.3%2.3 $84.81 12/15/20246,160,000 shares $552.68 million -1.6%4.4%2.9 $89.72 11/30/20246,260,000 shares $436.45 million +0.3%4.4%3.5 $69.72 11/15/20246,240,000 shares $419.52 million +3.5%4.4%3.2 $67.23 10/31/20246,030,000 shares $383.12 million -1.3%4.2%3.1 $63.54 10/15/20246,110,000 shares $402.47 million +3.7%4.3%3.3 $65.87 9/30/20245,890,000 shares $362.82 million -0.7%4.1%3.4 $61.60 9/15/20245,930,000 shares $333.09 million +3.1%4.2%3.7 $56.17 8/31/20245,750,000 shares $331.49 million +19.1%4.1%3.7 $57.65 8/15/20244,830,000 shares $262.37 million +9.5%3.4%3.2 $54.32 7/31/20244,410,000 shares $232.58 million +6.3%3.1%3 $52.74 7/15/20244,150,000 shares $202.94 million +3.2%2.9%2.7 $48.90 6/30/20244,020,000 shares $193.68 million +22.2%2.8%2.5 $48.18 6/15/20243,290,000 shares $153.64 million -38.7%2.3%2 $46.70 5/31/20245,370,000 shares $258.62 million -2.2%3.8%3.1 $48.16 5/15/20245,490,000 shares $270.71 million +5.6%3.9%2.9 $49.31 4/30/20245,200,000 shares $240.34 million +14.0%3.7%2.5 $46.22 4/15/20244,560,000 shares $202.14 million -13.6%3.2%2.2 $44.33 3/31/20245,280,000 shares $261.10 million +4.6%3.7%2.5 $49.45 3/15/20245,050,000 shares $252.60 million -15.8%3.5%2.4 $50.02 2/29/20246,000,000 shares $341.46 million +11.9%4.2%2.7 $56.91 2/15/20245,360,000 shares $305.79 million +16.3%3.7%3 $57.05 1/31/20244,610,000 shares $244.33 million +2.0%3.2%2.7 $53.00 1/15/20244,520,000 shares $224.73 million +10.5%3.2%2.8 $49.72 12/31/20234,090,000 shares $184.09 million +14.3%2.9%2.7 $45.01 12/15/20233,580,000 shares $155.44 million -2.2%2.5%2.4 $43.42Is Elon's empire crumbling? (Ad)The Tesla Shock Nobody Sees Coming While headlines scream "Tesla is doomed"... Jeff Brown has uncovered a revolutionary AI breakthrough buried inside Tesla's labs. One that is helping AI escape from our computer screens and manifest itself here in the real world all while creating a 25,000% growth market explosion starting as early as October 23rd. Click here to see the Tesla shock that could blindside everyone. 11/30/20233,660,000 shares $167.77 million -1.9%2.5%2.7 $45.84 11/15/20233,730,000 shares $173.05 million -7.2%2.6%2.7 $46.40 10/31/20234,020,000 shares $169.64 million +30.1%2.8%2.8 $42.20 10/15/20233,090,000 shares $129.78 million +3.3%2.1%2 $42.00 9/30/20232,990,000 shares $141.31 million -15.3%2.1%1.8 $47.26 9/15/20233,530,000 shares $172.30 million -0.3%2.4%2.1 $48.81 8/31/20233,540,000 shares $177 million +2.6%2.4%1.8 $50.00 8/15/20233,450,000 shares $145.07 million -11.3%2.3%1.7 $42.05 7/31/20233,890,000 shares $164.20 million +9.3%2.6%1.9 $42.21 7/15/20233,560,000 shares $147.60 million -13.6%2.4%1.8 $41.46 6/30/20234,120,000 shares $175.06 million -1.2%2.8%2.1 $42.49 6/15/20234,170,000 shares $184.69 million -3.0%2.8%2.1 $44.29 5/31/20234,300,000 shares $200.94 million -3.6%2.9%2.3 $46.73 5/15/20234,460,000 shares $198.11 million +13.8%3.0%2.6 $44.42 4/30/20233,920,000 shares $180.48 million -7.3%2.7%2.3 $46.04 4/15/20234,230,000 shares $216.32 million +8.5%2.9%2.5 $51.14 3/31/20233,900,000 shares $204.83 million +0.5%2.7%2.3 $52.52 3/15/20233,880,000 shares $193.15 million -5.4%2.6%2.4 $49.78 2/28/20234,100,000 shares $197.70 million +4.9%2.8%2.2 $48.22 2/15/20233,910,000 shares $191.20 million +1.8%2.7%2.3 $48.90 1/31/20233,840,000 shares $199.76 million -2.8%2.6%2.1 $52.02 1/15/20233,950,000 shares $201.81 million +1.3%2.7%2.1 $51.09 12/30/20223,900,000 shares $198.82 million +9.9%2.7%2.1 $50.98 12/15/20223,550,000 shares $172.28 million +2.6%2.4%1.8 $48.53 11/30/20223,460,000 shares $155.56 million -18.2%2.4%1.8 $44.96 11/15/20224,230,000 shares $193.40 million -15.2%2.9%2.3 $45.72 10/31/20224,990,000 shares $239.02 million -1.2%3.4%2.9 $47.90 10/15/20225,050,000 shares $199.93 million +3.1%3.5%3.1 $39.59 9/30/20224,900,000 shares $198.11 million -1.6%3.4%3.2 $40.43 9/15/20224,980,000 shares $210.16 million +31.4%3.4%3.3 $42.20 8/31/20223,790,000 shares $192.30 million -2.1%2.6%2.5 $50.74 8/15/20223,870,000 shares $213.51 million +4.9%2.6%2.7 $55.17 7/31/20223,690,000 shares $190.40 million -1.1%2.5%2.5 $51.60 7/15/20223,730,000 shares $177.18 million -1.8%2.5%2.5 $47.50 6/30/20223,800,000 shares $173.66 million -0.8%2.6%2.5 $45.70 6/15/20223,830,000 shares $170.40 million +10.7%2.6%2.6 $44.49 5/31/20223,460,000 shares $175.84 million +7.8%2.3%2.3 $50.82 5/15/20223,210,000 shares $168.08 million +16.3%2.1%2.2 $52.36 4/30/20222,760,000 shares $152.27 million +10.0%1.8%1.8 $55.17 4/15/20222,510,000 shares $140.16 million -3.8%1.7%1.6 $55.84 3/31/20222,610,000 shares $158.24 million -9.7%1.7%1.5 $60.63 3/15/20222,890,000 shares $163.60 million -38.0%1.9%1.7 $56.61 2/28/20224,660,000 shares $318.84 million -3.9%3.1%2.5 $68.42 2/15/20224,850,000 shares $332.37 million +69.6%3.2%2.8 $68.53 1/31/20222,860,000 shares $189.65 million -40.8%1.9%1.8 $66.31 1/15/20224,830,000 shares $344.91 million -12.7%3.2%3.2 $71.41 12/31/20215,530,000 shares $425.64 million -12.6%3.6%4.1 $76.97 12/15/20216,330,000 shares $471.59 million +85.6%4.2%5.1 $74.50 11/30/20213,410,000 shares $205.38 million +2.4%2.2%3.3 $60.23 11/15/20213,330,000 shares $204.96 million -19.6%2.2%3.1 $61.55Is Elon's empire crumbling? (Ad)The Tesla Shock Nobody Sees Coming While headlines scream "Tesla is doomed"... Jeff Brown has uncovered a revolutionary AI breakthrough buried inside Tesla's labs. One that is helping AI escape from our computer screens and manifest itself here in the real world all while creating a 25,000% growth market explosion starting as early as October 23rd. Click here to see the Tesla shock that could blindside everyone. 10/29/20214,140,000 shares $224.76 million +5.9%2.7%3.7 $54.29 10/15/20213,910,000 shares $204.30 million -5.3%2.6%3.8 $52.25 9/30/20214,130,000 shares $212.08 million -2.4%2.7%3.8 $51.35 9/15/20214,230,000 shares $225.80 million +8.7%2.8%3.8 $53.38 8/31/20213,890,000 shares $222.24 million +5.4%2.5%3.4 $57.13 8/13/20213,690,000 shares $206.34 million -10.7%2.4%3.1 $55.92 7/30/20214,130,000 shares $240.12 million -11.2%2.7%3.4 $58.14 7/15/20214,650,000 shares $262.68 million -11.1%3.0%3.4 $56.49 6/30/20215,230,000 shares $297.53 million +12.5%3.4%3.8 $56.89 6/15/20214,650,000 shares $267.98 million -0.2%3.0%3.4 $57.63 5/28/20214,660,000 shares $246.37 million -5.9%3.1%3.4 $52.87 5/14/20214,950,000 shares $250.67 million +11.2%3.2%3.6 $50.64 4/30/20214,450,000 shares $234.74 million +15.6%2.9%3.3 $52.75 4/15/20213,850,000 shares $215.29 million -4.5%2.5%2.9 $55.92 3/31/20214,030,000 shares $220.48 million -0.5%2.6%3 $54.71 3/15/20214,050,000 shares $220.08 million +31.9%2.7%2.7 $54.34 2/26/20213,070,000 shares $159.18 million -7.8%2.0%1.8 $51.85 2/12/20213,330,000 shares $185.31 million -16.1%2.2%2 $55.65 1/29/20213,970,000 shares $214.66 million -13.9%2.6%2.3 $54.07 1/15/20214,610,000 shares $251.06 million -16.0%3.0%2.6 $54.46 12/31/20205,490,000 shares $288.17 million +35.6%3.6%3 $52.49 12/15/20204,050,000 shares $193.71 million +37.3%2.7%2.1 $47.83 11/30/20202,950,000 shares $131.19 million +14.8%1.9%1.5 $44.47 11/15/20202,570,000 shares $111.92 million -16.3%1.7%1 $43.55 10/30/20203,070,000 shares $119.15 million -29.9%2.0%1.3 $38.81 10/15/20204,380,000 shares $184.27 million +30.0%2.9%1.9 $42.07 9/30/20203,370,000 shares $133.76 million -8.7%2.2%1.4 $39.69 9/15/20203,690,000 shares $153.58 million +25.9%2.4%1.6 $41.62 8/31/20202,930,000 shares $166.34 million -26.6%1.9%1.3 $56.77 CIEN Short Interest - Frequently Asked Questions What is Ciena's current short interest? Short interest is the volume of Ciena shares that have been sold short but have not yet been covered or closed out. As of July 31st, investors have sold 5,740,000 shares of CIEN short. 4.13% of Ciena's shares are currently sold short. Learn More on Ciena's current short interest. What is a good short interest ratio for Ciena? 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. CIEN shares currently have a short interest ratio of 3.0. Learn More on Ciena's short interest ratio. Which institutional investors are shorting Ciena? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Ciena: Group One Trading LLC, Jane Street Group LLC, Squarepoint Ops LLC, Oribel Capital Management LP, Walleye Capital LLC, Walleye Trading LLC, Capital Fund Management S.A., Twin Tree Management LP, IMC Chicago LLC, CenterStar Asset Management LLC, 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 Ciena? 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. 4.13% of Ciena's floating shares are currently sold short. Is Ciena's short interest increasing or decreasing? Ciena saw a increase in short interest during the month of July. As of July 31st, there was short interest totaling 5,740,000 shares, an increase of 5.7% from the previous total of 5,430,000 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. What is Ciena's float size? Ciena currently has issued a total of 141,370,000 shares. Some of Ciena's outstanding shares are available for trading, while others are subject to various restrictions. The public float, also referred to as floating shares or "the float", are shares that publicly owned, unrestricted and available to trade on the open market. Ciena currently has a public float of 139,140,000 shares. How does Ciena's short interest compare to its competitors? 4.13% of Ciena's shares are currently sold short. Here is how the short interest of companies compare to Ciena: Lumentum Holdings Inc. (15.61%), Arista Networks, Inc. (1.48%), Amphenol Corporation (1.09%), F5, Inc. (3.05%), EchoStar Corporation (12.38%), InterDigital, Inc. (7.52%), Calix, Inc (4.29%), Viasat Inc. (18.80%), Extreme Networks, Inc. (5.90%), Bel Fuse Inc. (4.40%), 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), MicroStrategy Incorporated ($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 Ciena stock? Short selling CIEN is an investing strategy that aims to generate trading profit from Ciena as its price is falling. CIEN shares are trading down $0.39 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 Ciena? A short squeeze for Ciena 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 CIEN, which in turn drives the price of the stock up even further. How often is Ciena'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 CIEN, twice per month. The most recent reporting period available is July, 31 2025. 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