Zai Lab (ZLAB) Short Interest Ratio & Short Volume $36.19 -0.77 (-2.08%) Closing price 04:00 PM EasternExtended Trading$36.29 +0.10 (+0.28%) As of 06:57 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 5.11 million shares, representing 5.42% of the float (the number of shares available for trading by the public). This marks a 2.61% increase in short interest from the previous month. The short interest ratio (days to cover) is 4.4, indicating that it would take 4.4 days of the average trading volume of 906,547 shares to cover all short positions.Current Short Interest5,110,000 sharesPrevious Short Interest4,980,000 sharesChange Vs. Previous Month+2.61%Dollar Volume Sold Short$154.78 millionShort Interest Ratio4.4 Days to CoverLast Record DateMay 31, 2025Outstanding Shares110,330,000 sharesShort Percent of Float5.42%Today's Trading Volume563,086 sharesAverage Trading Volume906,547 sharesToday's Volume Vs. Average62% 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 5/31/20255,110,000 shares $154.78 million +2.6%5.4%4.4 $30.29 5/15/20254,980,000 shares $143.18 million -25.1%5.3%4 $28.75 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 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. 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 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 $25.22Why July is critical for your stocks (Ad)Big Study Shows Stocks Extremely Likely to Crash in 2026? Legendary quant analyst Marc Chaikin says in 50 years on Wall Street, one stock cycle indicator worked better than anything else. It's been studied by Schwab, T.Rowe, Goldman, and more. And now Chaikin is sounding the alarm because this cycle indicator is pointing to March 2026 for the next big crash.Get the facts here... 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 $25.76 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 $124.74Why July is critical for your stocks (Ad)Big Study Shows Stocks Extremely Likely to Crash in 2026? Legendary quant analyst Marc Chaikin says in 50 years on Wall Street, one stock cycle indicator worked better than anything else. It's been studied by Schwab, T.Rowe, Goldman, and more. And now Chaikin is sounding the alarm because this cycle indicator is pointing to March 2026 for the next big crash.Get the facts here... 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 $150.24 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 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 May 31st, investors have sold 5,110,000 shares of ZLAB short. 5.42% of Zai Lab's shares are currently sold 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 4.0. 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, and Jefferies Financial Group Inc.. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Zai Lab? 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. 5.42% of Zai Lab's floating shares are currently sold short. Is Zai Lab's short interest increasing or decreasing? Zai Lab saw a increase in short interest during the month of May. As of May 31st, there was short interest totaling 5,110,000 shares, an increase of 2.6% from the previous total of 4,980,000 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? 5.42% of Zai Lab's shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Zai Lab: Summit Therapeutics Inc. (28.33%), Genmab A/S (0.40%), Intra-Cellular Therapies, Inc. (2.58%), Dr. Reddy's Laboratories Limited (1.74%), Ascendis Pharma A/S (9.28%), Viatris Inc. (4.33%), Qiagen (2.96%), Moderna, Inc. (19.23%), Blueprint Medicines Co. (9.93%), BridgeBio Pharma, Inc. (15.35%), 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 ($64.96 billion), Invesco QQQ ($27.88 billion), iShares Russell 2000 ETF ($19.94 billion), iShares 20+ Year Treasury Bond ETF ($9.69 billion), MicroStrategy Incorporated ($8.58 billion), SPDR S&P Biotech ETF ($5.72 billion), Invesco S&P 500 Equal Weight ETF ($5.45 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($4.70 billion), Charter Communications, Inc. ($4.54 billion), and Industrial Select Sector SPDR Fund ($4.49 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 down $0.86 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 increases 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 May, 31 2025. More Short Interest Resources from MarketBeat Related Companies Summit Therapeutics Short Interest Genmab A/S Short Interest Intra-Cellular Therapies Short Interest Dr. Reddy's Laboratories Short Interest Ascendis Pharma A/S Short Interest Viatris Short Interest Qiagen Short Interest Moderna Short Interest Blueprint Medicines Short Interest BridgeBio Pharma 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 6/26/2025 by MarketBeat.com Staff From Our PartnersThe $7 company helping Nvidia build the world’s first trillion-dollar robot …Michael Robinson has been at the forefront of the technology market for over 40 years. 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