Fastly (FSLY) Short Interest Ratio & Short Volume $8.07 -0.21 (-2.48%) Closing price 06/10/2025 03:59 PM EasternExtended Trading$8.09 +0.01 (+0.12%) As of 06/10/2025 07:56 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 Fastly Short Interest DataFastly (FSLY) has a short interest of 10.43 million shares, representing 7.97% of the float (the number of shares available for trading by the public). This marks a 5.89% increase in short interest from the previous month. The short interest ratio (days to cover) is 3.6, indicating that it would take 3.6 days of the average trading volume of 3.09 million shares to cover all short positions.Current Short Interest10,430,000 sharesPrevious Short Interest9,850,000 sharesChange Vs. Previous Month+5.89%Dollar Volume Sold Short$84.07 millionShort Interest Ratio3.6 Days to CoverLast Record DateMay 15, 2025Outstanding Shares144,686,000 sharesShort Percent of Float7.97%Today's Trading Volume2,598,663 sharesAverage Trading Volume3,091,032 sharesToday's Volume Vs. Average84% Short Selling Fastly? Sign up to receive the latest short interest report for Fastly and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartFSLY Short Interest Over TimeFSLY Days to Cover Over TimeFSLY Percentage of Float Shorted Over Time Fastly Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 5/15/202510,430,000 shares $84.07 million +5.9%8.0%3.6 $8.06 4/30/20259,850,000 shares $56.64 million +1.2%N/A3 $5.75 4/15/20259,730,000 shares $51.91 million -6.4%7.4%3.1 $5.34 3/31/202510,400,000 shares $66.09 million -1.2%7.9%3.3 $6.36 3/15/202510,530,000 shares $71.87 million +1.0%8.0%3.3 $6.83 2/28/202510,430,000 shares $70.77 million -4.4%8.0%3 $6.79 2/15/202510,910,000 shares $88.21 million +17.2%8.3%3.1 $8.09 1/31/20259,310,000 shares $97.34 million -7.3%N/A2.9 $10.46 1/15/202510,040,000 shares $94.78 million +8.4%N/A3.1 $9.44 12/31/20249,260,000 shares $87.41 million -8.5%N/A2.9 $9.44 Get the Latest News and Ratings for FSLY and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Fastly and its competitors with MarketBeat's FREE daily newsletter. 12/15/202410,120,000 shares $106.06 million +2.1%N/A3.2 $10.48 11/30/20249,910,000 shares $84.04 million -2.8%N/A3.2 $8.48 11/15/202410,200,000 shares $65.28 million -13.9%N/A3.9 $6.40 10/31/202411,840,000 shares $85.60 million -4.2%N/A4.1 $7.23 10/15/202412,360,000 shares $89.24 million -14.1%N/A4 $7.22 9/30/202414,390,000 shares $108.93 million -2.2%N/A4.5 $7.57 9/15/202414,720,000 shares $98.62 million +3.0%N/A4.5 $6.70 8/31/202414,290,000 shares $86.03 million -7.3%N/A4.3 $6.02 8/15/202415,410,000 shares $96.70 million -7.1%N/A4.5 $6.28 7/31/202416,590,000 shares $134.54 million +2.0%N/A5.2 $8.11 7/15/202416,270,000 shares $123.73 million +1.0%N/A4.4 $7.61 6/30/202416,110,000 shares $118.73 million -1.4%N/A4.4 $7.37 6/15/202416,330,000 shares $117.58 million +17.2%N/A4.3 $7.20 5/31/202413,930,000 shares $109.21 million -3.1%N/A3.7 $7.84 5/15/202414,370,000 shares $126.46 million +14.6%N/A3.5 $8.80 4/30/202412,540,000 shares $158.69 million +9.1%N/A2.6 $12.66 4/15/202411,490,000 shares $150.75 million +12.8%N/A2.8 $13.12 3/31/202410,190,000 shares $132.16 million +14.1%N/A2.5 $12.97 3/15/20248,930,000 shares $112.52 million +7.2%N/A2.3 $12.60 2/29/20248,330,000 shares $118.45 million +5.7%N/A2.2 $14.22 2/15/20247,880,000 shares $128.52 million -0.4%N/A2.3 $16.31 1/31/20247,910,000 shares $159.03 million +6.9%N/A3 $20.11 1/15/20247,400,000 shares $132.24 million -10.8%N/A2.7 $17.87 12/31/20238,300,000 shares $147.74 million +4.0%N/A3.1 $17.80 12/15/20237,980,000 shares $149.19 million -14.1%N/A3 $18.70 11/30/20239,290,000 shares $154.21 million -6.1%N/A3.5 $16.60 11/15/20239,890,000 shares $171.00 million -0.3%N/A3.6 $17.29 10/31/20239,920,000 shares $145.63 million -11.0%N/A3.5 $14.68 10/15/202311,150,000 shares $163.91 million -12.7%N/A3.9 $14.70 9/30/202312,770,000 shares $244.80 million -9.4%N/A4.4 $19.17Elon’s backup plan for AI (Ad)Elon knows the future isn’t about smarter AI — it’s about powering it. And this new technology is quietly becoming one of the most profitable stories of the year.Chris Rowe just shared the full details in a live presentation… Watch it here before it comes down. 9/15/202314,090,000 shares $289.34 million +0.6%N/A5.1 $20.54 8/31/202314,010,000 shares $333.30 million +4.2%N/A4.7 $23.79 8/15/202313,450,000 shares $251.65 million +17.9%N/A4.5 $18.71 7/31/202311,410,000 shares $209.60 million -1.6%N/A3.8 $18.37 7/15/202311,600,000 shares $203 million +4.6%N/A4 $17.50 6/30/202311,090,000 shares $174.78 million -3.3%N/A3.8 $15.76 6/15/202311,470,000 shares $203.13 million -6.9%N/A3.6 $17.71 5/31/202312,320,000 shares $200.51 million +1.1%N/A3.8 $16.28 5/15/202312,190,000 shares $161.03 million -5.7%N/A3.4 $13.21 4/30/202312,930,000 shares $191.11 million -5.6%N/A2.7 $14.78 4/15/202313,700,000 shares $218.24 million +10.8%N/A2.9 $15.93 3/31/202312,370,000 shares $219.69 million -9.5%N/A2.6 $17.76 3/15/202313,670,000 shares $199.17 million +4.7%N/A2.9 $14.57 2/28/202313,060,000 shares $181.40 million +1.5%N/A2.9 $13.89 2/15/202312,870,000 shares $178.51 million +10.8%N/A3 $13.87 1/31/202311,620,000 shares $120.27 million -1.7%N/A3.7 $10.35 1/15/202311,820,000 shares $114.18 million +6.3%N/A3.7 $9.66 12/30/202211,120,000 shares $91.07 million +3.6%N/A3.5 $8.19 12/15/202210,730,000 shares $95.50 million -3.7%N/A3.5 $8.90 11/30/202211,140,000 shares $107.61 million +3.9%N/A3.5 $9.66 11/15/202210,720,000 shares $114.70 million -9.7%N/A3.2 $10.70 10/31/202211,870,000 shares $100.78 million +0.9%N/A3.5 $8.49 10/15/202211,770,000 shares $87.57 million -12.9%N/A3.4 $7.44 9/30/202213,510,000 shares $123.75 million +2.8%N/A3.7 $9.16 9/15/202213,140,000 shares $129.56 million +0.5%N/A3.3 $9.86 8/31/202213,080,000 shares $122.30 million +22.1%N/A3.2 $9.35 8/15/202210,710,000 shares $130.02 million -15.1%N/A2.6 $12.14 7/31/202212,610,000 shares $143.38 million -2.4%N/A2.8 $11.37 7/15/202212,920,000 shares $150.39 million -10.3%N/A2.8 $11.64 6/30/202214,410,000 shares $167.30 million +2.3%N/A2.9 $11.61 6/15/202214,080,000 shares $154.32 million -1.1%N/A2.8 $10.96 5/31/202214,230,000 shares $185.70 million -11.9%N/A2.8 $13.05 5/15/202216,160,000 shares $198.44 million +15.5%N/A2.7 $12.28 4/30/202213,990,000 shares $222.44 million +2.5%N/A2.3 $15.90 4/15/202213,650,000 shares $257.71 million -2.9%N/A2.4 $18.88 3/31/202214,050,000 shares $244.19 million +1.3%N/A2.7 $17.38 3/15/202213,870,000 shares $190.02 million +11.5%N/A2.9 $13.70 2/28/202212,440,000 shares $231.38 million +20.2%11.8%2.8 $18.60 2/15/202210,350,000 shares $305.33 million -24.2%N/A2.6 $29.50 1/31/202213,650,000 shares $391.21 million -1.7%N/A5 $28.66 1/15/202213,880,000 shares $433.33 million -4.4%N/A4.7 $31.22 12/31/202114,520,000 shares $514.73 million -3.2%N/A4.8 $35.45 12/15/202115,000,000 shares $598.65 million -1.7%N/A5 $39.91 11/30/202115,260,000 shares $622.00 million +2.0%N/A5.2 $40.76 11/15/202114,960,000 shares $742.02 million -4.8%N/A5.1 $49.60 10/29/202115,710,000 shares $795.08 million -6.2%14.9%5.1 $50.61 10/15/202116,750,000 shares $751.91 million +0.3%15.9%4.3 $44.89 9/30/202116,700,000 shares $675.35 million +1.9%15.9%4.4 $40.44 9/15/202116,390,000 shares $714.11 million -3.0%15.6%4 $43.57 8/31/202116,900,000 shares $736.84 million -10.2%16.2%3.8 $43.60Elon’s backup plan for AI (Ad)Elon knows the future isn’t about smarter AI — it’s about powering it. And this new technology is quietly becoming one of the most profitable stories of the year.Chris Rowe just shared the full details in a live presentation… Watch it here before it comes down. 8/13/202118,820,000 shares $792.51 million -12.8%18.1%3.9 $42.11 7/30/202121,580,000 shares $1.04 billion +9.7%22.8%4.2 $48.07 7/15/202119,680,000 shares $966.29 million +2.0%19.1%4.1 $49.10 6/30/202119,290,000 shares $1.15 billion -6.7%18.6%4 $59.60 6/15/202120,670,000 shares $1.13 billion -5.8%20.0%4.4 $54.53 5/28/202121,950,000 shares $1.04 billion -0.2%22.3%4.8 $47.19 5/14/202122,000,000 shares $879.56 million +11.1%N/A4.6 $39.98 4/30/202119,810,000 shares $1.29 billion -1.7%N/A3.8 $65.05 4/15/202120,150,000 shares $1.45 billion +6.6%N/A4.4 $71.92 3/31/202118,900,000 shares $1.23 billion -7.1%N/A3.9 $65.26 3/15/202120,340,000 shares $1.53 billion +5.7%N/A4 $75.16 2/26/202119,240,000 shares $1.39 billion +37.3%N/A3 $72.19 2/12/202114,010,000 shares $1.52 billion -0.9%N/A2.2 $108.26 1/29/202114,140,000 shares $1.55 billion -7.4%N/A2.3 $109.54 1/15/202115,270,000 shares $1.39 billion +0.5%N/A2 $91.12 12/31/202015,190,000 shares $1.37 billion -1.9%N/A1.6 $90.43 12/15/202015,480,000 shares $1.46 billion -11.6%N/A1.5 $94.25 11/30/202017,520,000 shares $1.48 billion -10.6%N/A1.7 $84.30 11/15/202019,600,000 shares $1.52 billion +31.4%N/A1.9 $77.71 10/30/202014,920,000 shares $1.02 billion +135.3%N/A1.4 $68.38 10/15/20206,340,000 shares $780.96 million -21.0%N/A0.6 $123.18 9/30/20208,020,000 shares $751.31 million -11.5%N/A0.8 $93.68 9/15/20209,060,000 shares $761.76 million +11.3%N/A0.8 $84.08 8/31/20208,140,000 shares $755.72 million -18.4%N/A0.7 $92.84 8/14/20209,970,000 shares $763.80 million +31.0%N/A0.9 $76.61 7/31/20207,610,000 shares $734.29 million -5.7%N/A0.8 $96.49 7/15/20208,070,000 shares $664.73 million +7.2%N/A1 $82.37 6/30/20207,530,000 shares $641.03 million +59.2%N/A1.1 $85.13 6/15/20204,730,000 shares $245.87 million +8.2%N/A1 $51.98 FSLY Short Interest - Frequently Asked Questions What is Fastly's current short interest? Short interest is the volume of Fastly shares that have been sold short but have not yet been closed out or covered. As of May 15th, investors have sold 10,430,000 shares of FSLY short. 7.97% of Fastly's shares are currently sold short. Learn More on Fastly's current short interest. What is a good short interest ratio for Fastly? 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. FSLY shares currently have a short interest ratio of 4.0. Learn More on Fastly's short interest ratio. Which institutional investors are shorting Fastly? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Fastly: Jane Street Group LLC, Millennium Management LLC, PEAK6 LLC, Walleye Trading LLC, Simplex Trading LLC, Wolverine Asset Management LLC, and IMC Chicago LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Fastly? 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. 7.97% of Fastly's floating shares are currently sold short. Is Fastly's short interest increasing or decreasing? Fastly saw a increase in short interest during the month of May. As of May 15th, there was short interest totaling 10,430,000 shares, an increase of 5.9% from the previous total of 9,850,000 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 Fastly's short interest compare to its competitors? 7.97% of Fastly's shares are currently sold short. Here is how the short interest of companies in the industry of "computer software" compare to Fastly: Asana, Inc. (11.12%), Paycor HCM, Inc. (6.81%), SoundHound AI, Inc. (31.48%), Tenable Holdings, Inc. (3.97%), Cellebrite DI Ltd. (2.07%), AvePoint, Inc. (6.30%), Braze, Inc. (4.71%), Workiva Inc. (3.44%), Rumble Inc. (11.66%), BlackLine, Inc. (12.64%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Invesco QQQ ($29.20 billion), Strategy Incorporated ($10.88 billion), iShares 20+ Year Treasury Bond ETF ($10.04 billion), Capital One Financial Co. ($5.51 billion), Charter Communications, Inc. ($5.00 billion), Super Micro Computer, Inc. ($4.43 billion), Apollo Global Management, Inc. ($4.02 billion), Hims & Hers Health, Inc. ($3.65 billion), VanEck Semiconductor ETF ($3.27 billion), and Coinbase Global, Inc. ($3.10 billion). View all of the most shorted stocks. What does it mean to sell short Fastly stock? Short selling FSLY is an investing strategy that aims to generate trading profit from Fastly as its price is falling. FSLY shares are trading down $0.21 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 Fastly? A short squeeze for Fastly 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 FSLY, which in turn drives the price of the stock up even further. How often is Fastly'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 FSLY, twice per month. The most recent reporting period available is May, 15 2025. More Short Interest Resources from MarketBeat Related Companies Asana Short Interest Data Paycor HCM Short Interest Data SoundHound AI Short Interest Data Tenable Short Interest Data Cellebrite DI Short Interest Data AvePoint Short Interest Data Braze Short Interest Data Workiva Short Interest Data Rumble Short Interest Data BlackLine Short Interest Data Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NYSE:FSLY) was last updated on 6/11/2025 by MarketBeat.com Staff From Our PartnersElon’s NEXT Big IPO?Cancel your internet TODAY!? Take your latest internet bill and light it on fire… then count the seconds it...Banyan Hill Publishing | SponsoredTrump wipes out trillions overnight…Is there anybody more powerful than Donald Trump right now? 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