Zai Lab (ZLAB) Short Interest Ratio & Short Volume $32.59 -0.04 (-0.12%) Closing price 04:00 PM EasternExtended Trading$32.46 -0.13 (-0.40%) As of 04:09 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 InterestTrendsBuy This Stock Zai Lab Short Interest DataZai Lab (ZLAB) has a short interest of 6.65 million shares. This marks a -14.41% decrease in short interest from the previous month. The short interest ratio (days to cover) is 5.4, indicating that it would take 5.4 days of the average trading volume of 1.07 million shares to cover all short positions.Current Short Interest6,650,000 sharesPrevious Short Interest7,770,000 sharesChange Vs. Previous Month-14.41%Dollar Volume Sold Short$210.74 millionShort Interest Ratio5.4 Days to CoverLast Record DateApril 30, 2025Outstanding Shares110,328,000 sharesPercentage of Shares Shorted6.03%Today's Trading Volume835,602 sharesAverage Trading Volume1,069,920 sharesToday's Volume Vs. Average78% Short Selling Zai Lab? Sign up to receive the latest short interest report for Zai Lab and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartZLAB Short Interest Over TimeZLAB Days to Cover Over TimeZLAB Percentage of Float Shorted Over Time Zai Lab Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 4/30/20256,650,000 shares $210.74 million -14.4%N/A5.4 $31.69 4/15/20257,770,000 shares $236.05 million +6.2%8.2%6.6 $30.38 3/31/20257,320,000 shares $264.54 million -7.6%7.8%7.2 $36.14 3/15/20257,920,000 shares $302.54 million +1.2%8.4%9.9 $38.20 2/28/20257,830,000 shares $271.23 million +3.3%8.3%9.6 $34.64 2/15/20257,580,000 shares $219.82 million -1.7%8.0%9.5 $29.00 1/31/20257,710,000 shares $209.63 million +27.4%N/A9.5 $27.19 1/15/20256,050,000 shares $148.83 million +1.9%N/A6.7 $24.60 12/31/20245,940,000 shares $155.57 million +1.5%N/A6.4 $26.19 12/15/20245,850,000 shares $154.03 million +13.2%N/A6 $26.33 Get the Latest News and Ratings for ZLAB and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Zai Lab and its competitors with MarketBeat's FREE daily newsletter. 11/30/20245,170,000 shares $149.15 million +5.7%N/A5.4 $28.85 11/15/20244,890,000 shares $132.32 million +4.9%N/A5.1 $27.06 10/31/20244,660,000 shares $140.83 million -1.9%N/A6.2 $30.22 10/15/20244,750,000 shares $117.75 million -2.3%N/A6.4 $24.79 9/30/20244,860,000 shares $117.32 million -10.3%N/A7.4 $24.14 9/15/20245,420,000 shares $111.16 million +9.9%N/A9.5 $20.51 8/31/20244,930,000 shares $98.30 million +4.7%N/A8.7 $19.94 8/15/20244,710,000 shares $78.42 million +13.2%N/A8.5 $16.65 7/31/20244,160,000 shares $79.16 million +40.5%N/A6.4 $19.03 7/15/20242,960,000 shares $53.28 million +5.0%N/A4.9 $18.00 6/30/20242,820,000 shares $48.87 million +1.1%N/A4.8 $17.33 6/15/20242,790,000 shares $52.15 million +3.0%N/A4.5 $18.69 5/31/20242,710,000 shares $48.18 million -17.4%N/A4.2 $17.78 5/15/20243,280,000 shares $68.39 million -24.8%N/A5.1 $20.85 4/30/20244,360,000 shares $68.89 million +6.9%N/A6.4 $15.80 4/15/20244,080,000 shares $57.94 million +5.4%N/A6.3 $14.20 3/31/20243,870,000 shares $62.00 million +5.7%N/A5.8 $16.02 3/15/20243,660,000 shares $67.60 million -9.9%N/A5.5 $18.47 2/29/20244,060,000 shares $85.18 million -13.4%N/A6.1 $20.98 2/15/20244,690,000 shares $93.28 million -4.3%N/A7.4 $19.89 1/31/20244,900,000 shares $105.69 million +2.3%N/A8.5 $21.57 1/15/20244,790,000 shares $117.93 million +14.1%N/A9.1 $24.62 12/31/20234,200,000 shares $114.79 million +3.5%N/A8.7 $27.33 12/15/20234,060,000 shares $121.76 million +5.2%N/A8.7 $29.99 11/30/20233,860,000 shares $105.34 million -4.7%N/A9.6 $27.29 11/15/20234,050,000 shares $112.10 million +7.4%N/A9.5 $27.68 10/31/20233,770,000 shares $95.00 million +23.2%N/A8.7 $25.20 10/15/20233,060,000 shares $77.17 million -5.6%N/A7.4 $25.22 9/30/20233,240,000 shares $78.76 million -3.6%N/A7.6 $24.31 9/15/20233,360,000 shares $86.55 million +2.4%N/A7.8 $25.76While others chase AI stocks, smart traders do this (Ad)Since the pandemic, the average mortgage payment has jumped from $1,427 to $2,047. That's an extra $600 every single month just vanishing from people's pockets. Meanwhile, credit card debt is hitting record highs, and savings accounts are at their lowest since 2008. Most folks are left with two options… Get a second job... or work overtime on weekends. But what if there was a third option? I just uncovered a shocking anomaly in the options market that could change everything... One that lets you target extra cash on days when most people make nothing - weekends. Think what that could mean for your monthly budget...you can get the full story here 8/31/20233,280,000 shares $83.54 million +4.1%N/A6.6 $25.47 8/15/20233,150,000 shares $77.24 million +3.3%N/A5.5 $24.52 7/31/20233,050,000 shares $91.68 million +3.4%N/A5.1 $30.06 7/15/20232,950,000 shares $82.16 million +0.3%N/A5 $27.85 6/30/20232,940,000 shares $81.53 million -6.1%N/A5 $27.73 6/15/20233,130,000 shares $89.11 million -4.3%N/A5.1 $28.47 5/31/20233,270,000 shares $106.24 million No ChangeN/A5.1 $32.49 5/15/20233,270,000 shares $110.04 million -1.8%N/A5.7 $33.65 4/30/20233,330,000 shares $116.48 million +1.2%N/A6.1 $34.98 4/15/20233,290,000 shares $126.73 million -3.8%N/A5.7 $38.52 3/31/20233,420,000 shares $113.75 million +4.9%N/A5.2 $33.26 3/15/20233,260,000 shares $104.32 million +12.4%N/A4.2 $32.00 2/28/20232,900,000 shares $107.74 million -0.7%N/A4.2 $37.15 2/15/20232,920,000 shares $108.51 million +1.0%N/A4.4 $37.16 1/31/20232,890,000 shares $121.78 million +6.3%N/A4.1 $42.14 1/15/20232,720,000 shares $129.53 million +1.1%N/A3.6 $47.62 12/30/20222,690,000 shares $82.58 million +4.3%N/A3.7 $30.70 12/15/20222,580,000 shares $84.83 million -9.8%N/A4.4 $32.88 11/30/20222,860,000 shares $110.28 million -3.7%N/A4.4 $38.56 11/15/20222,970,000 shares $114.97 million -0.7%N/A4.4 $38.71 10/31/20222,990,000 shares $66.62 million -1.3%N/A4.7 $22.28 10/15/20223,030,000 shares $87.05 million +2.0%N/A5.6 $28.73 9/30/20222,970,000 shares $101.57 million -5.7%N/A5.6 $34.20 9/15/20223,150,000 shares $154.19 million +9.0%N/A5.7 $48.95 8/31/20222,890,000 shares $133.55 million -0.7%N/A5.3 $46.21 8/15/20222,910,000 shares $133.22 million +4.3%N/A5 $45.78 7/31/20222,790,000 shares $113.08 million -6.4%N/A4.3 $40.53 7/15/20222,980,000 shares $116.22 million +12.0%N/A4.5 $39.00 6/30/20222,660,000 shares $92.25 million -11.9%N/A4.2 $34.68 6/15/20223,020,000 shares $74.02 million -6.2%N/A4.7 $24.51 5/31/20223,220,000 shares $93.70 million -2.7%N/A3.7 $29.10 5/15/20223,310,000 shares $109.96 million +4.8%N/A4 $33.22 4/30/20223,160,000 shares $126.27 million +3.6%N/A3.8 $39.96 4/15/20223,050,000 shares $135.45 million -15.3%N/A3.6 $44.41 3/31/20223,600,000 shares $158.33 million +7.1%N/A4 $43.98 3/15/20223,360,000 shares $97.64 million +7.4%3.6%3.9 $29.06 2/28/20223,130,000 shares $171.21 million -5.4%3.3%4.6 $54.70 2/15/20223,310,000 shares $188.54 million -5.7%3.5%5 $56.96 1/31/20223,510,000 shares $174.34 million +8.0%3.7%5.5 $49.67 1/15/20223,250,000 shares $161.79 million +14.4%3.5%5.2 $49.78 12/31/20212,840,000 shares $178.49 million -6.6%3.0%4.7 $62.85 12/15/20213,040,000 shares $166.90 million +8.6%3.2%4.8 $54.90 11/30/20212,800,000 shares $193.90 million -3.1%3.0%4.8 $69.25 11/15/20212,890,000 shares $248.42 million +3.6%3.1%5.5 $85.96 10/29/20212,790,000 shares $291.28 million +0.4%3.0%5.3 $104.40 10/15/20212,780,000 shares $283.56 million -9.2%3.0%4.7 $102.00 9/30/20213,060,000 shares $322.49 million +21.0%3.2%5.3 $105.39 9/15/20212,530,000 shares $315.59 million No Change2.7%4.6 $124.74 8/31/20212,530,000 shares $365.59 million +2.0%2.7%5 $144.50 8/13/20212,480,000 shares $372.60 million -6.4%2.7%4.5 $150.24While others chase AI stocks, smart traders do this (Ad)Since the pandemic, the average mortgage payment has jumped from $1,427 to $2,047. That's an extra $600 every single month just vanishing from people's pockets. Meanwhile, credit card debt is hitting record highs, and savings accounts are at their lowest since 2008. Most folks are left with two options… Get a second job... or work overtime on weekends. But what if there was a third option? I just uncovered a shocking anomaly in the options market that could change everything... One that lets you target extra cash on days when most people make nothing - weekends. Think what that could mean for your monthly budget...you can get the full story here 7/30/20212,650,000 shares $383.22 million +20.5%2.8%5 $144.61 7/15/20212,200,000 shares $374.42 million +3.3%2.4%4.7 $170.19 6/30/20212,130,000 shares $376.99 million -17.1%2.4%4.1 $176.99 6/15/20212,570,000 shares $426.88 million -12.9%2.8%4.8 $166.10 5/28/20212,950,000 shares $524.10 million No Change3.3%5.6 $177.66 5/14/20212,950,000 shares $447.46 million +18.0%N/A5.6 $151.68 4/30/20212,500,000 shares $420.65 million +7.3%N/A4.8 $168.26 4/15/20212,330,000 shares $384.05 million +17.1%N/A4.7 $164.83 3/31/20211,990,000 shares $257.51 million +3.7%N/A4.6 $129.40 3/15/20211,920,000 shares $275.88 million +31.5%N/A4.9 $143.69 2/26/20211,460,000 shares $215.19 million -10.4%N/A3.9 $147.39 2/12/20211,630,000 shares $297.20 million +2.5%N/A4.6 $182.33 1/29/20211,590,000 shares $249.38 million -20.1%N/A4.1 $156.84 1/15/20211,990,000 shares $326.22 million -5.7%N/A5.2 $163.93 12/31/20202,110,000 shares $282.97 million -14.2%N/A6.1 $134.11 12/15/20202,460,000 shares $267.60 million -4.3%N/A6.4 $108.78 11/30/20202,570,000 shares $277.92 million +0.8%N/A6.4 $108.14 10/30/20202,710,000 shares $228.21 million -14.2%N/A7.4 $84.21 10/15/20203,160,000 shares $287.56 million -10.2%N/A8.8 $91.00 9/30/20203,520,000 shares $292.76 million +32.3%N/A9.4 $83.17 9/15/20202,660,000 shares $209.61 million +4.7%N/A7.8 $78.80 8/31/20202,540,000 shares $201.60 million -5.2%N/A6.9 $79.37 8/14/20202,680,000 shares $213.14 million -2.2%N/A6.1 $79.53 7/31/20202,740,000 shares $208.54 million -2.8%N/A6 $76.11 7/15/20202,820,000 shares $241.62 million +2.6%N/A6.3 $85.68 6/30/20202,750,000 shares $226.96 million -7.4%N/A6 $82.53 6/15/20202,970,000 shares $204.93 million +21.2%N/A6.7 $69.00 5/29/20202,450,000 shares $167.48 million +21.9%N/A5.6 $68.36 ZLAB Short Interest - Frequently Asked Questions What is Zai Lab's current short interest? Short interest is the volume of Zai Lab shares that have been sold short but have not yet been closed out or covered. As of April 30th, investors have sold 6,650,000 shares of ZLAB short. Learn More on Zai Lab's current short interest. What is a good short interest ratio for Zai Lab? 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. ZLAB shares currently have a short interest ratio of 5.0. Learn More on Zai Lab's short interest ratio. Which institutional investors are shorting Zai Lab? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Zai Lab: Jane Street Group LLC, Jefferies Financial Group Inc., and Jefferies Financial Group Inc.. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. Is Zai Lab's short interest increasing or decreasing? Zai Lab saw a decrease in short interest in April. As of April 30th, there was short interest totaling 6,650,000 shares, a decrease of 14.4% from the previous total of 7,770,000 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 Zai Lab's short interest compare to its competitors? Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Zai Lab: Genmab A/S (0.39%), Dr. Reddy's Laboratories Limited (1.79%), Viatris Inc. (4.27%), Moderna, Inc. (17.58%), Qiagen (2.35%), Ascendis Pharma A/S (6.40%), Roivant Sciences Ltd. (12.03%), Revolution Medicines, Inc. (8.89%), BridgeBio Pharma, Inc. (11.68%), Blueprint Medicines Co. (8.76%), 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 Zai Lab stock? Short selling ZLAB is an investing strategy that aims to generate trading profit from Zai Lab as its price is falling. ZLAB shares are trading up $0.27 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 Zai Lab? A short squeeze for Zai Lab 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 ZLAB, which in turn drives the price of the stock up even further. How often is Zai Lab'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 ZLAB, twice per month. The most recent reporting period available is April, 30 2025. More Short Interest Resources from MarketBeat Related Companies Genmab A/S Short Interest Dr. Reddy's Laboratories Short Interest Viatris Short Interest Moderna Short Interest Qiagen Short Interest Ascendis Pharma A/S Short Interest Roivant Sciences Short Interest Revolution Medicines Short Interest BridgeBio Pharma Short Interest Blueprint Medicines Short Interest Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NASDAQ:ZLAB) was last updated on 5/21/2025 by MarketBeat.com Staff From Our PartnersMarket Panic: Trump Just Dropped a Bomb on Your Stockstock Market Panic: Trump Just Dropped a Bomb on Your Stocks The market is in freefall—and Trump's new tarif...American Alternative | SponsoredGold Hits New Highs as Global Markets SpiralWhen Trump took office in 2017, gold was just $1,100 an ounce. 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