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Zai Lab (ZLAB) Short Interest Ratio & Short Volume

Zai Lab logo
$23.58 -0.76 (-3.12%)
Closing price 10/27/2026 04:00 PM Eastern
Extended Trading
$23.28 -0.31 (-1.29%)
As of 04:05 AM 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 Massive. Learn more.
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Zai Lab Short Interest Overview

As of October 15, 2026, Zai Lab (ZLAB) had a short interest of 8.84 million shares sold short, representing 8.17% of the public float. This marks a 23.69% increase in short interest since the prior report. The short interest ratio (days to cover) is 11.3, meaning it would take 11.3 days of the average trading volume of 0 shares to cover all short positions.

Current Short Interest
8,843,854 shares
Previous Short Interest
7,149,727 shares
Change Vs. Previous Month
23.69%
Dollar Volume Sold Short
$207.92 million
Short Interest Ratio
11.3 Days to Cover
Last Record Date
October 15, 2026
Outstanding Shares
113,780,000 shares
Short Percent of Float
8.17%
Today's Trading Volume
1,539,674 shares
Average Trading Volume
0 shares
Today's Volume Vs. Average
∞
Short Selling Zai Lab?
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

ZLAB Short Interest Over Time

ZLAB Days to Cover Over Time

ZLAB Percentage of Float Shorted Over Time

Zai Lab 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
10/15/20268,843,854 shares $207.92 million +23.7%8.2%11.28 $23.51
9/30/20267,149,727 shares $188.32 million -12.4%6.6%9.04 $26.34
9/15/20268,156,879 shares $202.29 million +1.7%7.5%9.19 $24.80
8/31/20268,017,185 shares $204.12 million +7.4%7.4%7.33 $25.46
8/14/20267,465,887 shares $193.74 million +14.3%6.9%5.35 $25.95
7/31/20266,534,451 shares $119.38 million +2.9%6.0%10.85 $18.27
7/15/20266,351,893 shares $129.83 million -22.1%5.9%7.49 $20.44
6/30/20268,154,038 shares $154.93 million +12.5%7.5%7.97 $19.00
6/15/20267,250,668 shares $128.55 million +11.0%6.7%6.63 $17.73
5/29/20266,532,695 shares $115.56 million +25.9%6.1%8.49 $17.69
5/15/20265,187,168 shares $106.80 million +16.5%4.8%6.76 $20.59
4/30/20264,453,973 shares $96.38 million -19.0%4.1%5.14 $21.64
4/15/20265,497,720 shares $127.82 million +3.1%5.1%6.96 $23.25
3/31/20265,332,652 shares $100.31 million +9.0%4.9%6.79 $18.81
3/13/20264,890,948 shares $89.85 million +28.7%4.6%7.24 $18.37
2/27/20263,800,411 shares $73.04 million +12.7%3.5%9.55 $19.22
2/13/20263,371,454 shares $67.53 million -6.0%3.1%4.01 $20.03
1/30/20263,588,257 shares $59.57 million -7.3%3.4%5.47 $16.60
1/15/20263,870,954 shares $72.85 million -8.9%3.6%4.2 $18.82
12/31/20254,248,996 shares $74.95 million -19.8%4.0%4.85 $17.64
12/15/20255,300,558 shares $91.91 million +5.2%5.0%6.93 $17.34
11/28/20255,037,867 shares $102.87 million +9.4%4.7%5.42 $20.42
11/14/20254,603,118 shares $100.12 million -8.4%4.3%4.67 $21.75
10/31/20255,022,907 shares $131.25 million +4.4%4.7%5.52 $26.13
10/15/20254,810,000 shares $141.37 million -1.8%4.5%6.9 $29.39
9/30/20254,900,000 shares $166.06 million +0.4%N/A6.8 $33.89
9/15/20254,880,000 shares $155.77 million +3.0%N/A6.5 $31.92
8/31/20254,740,000 shares $156.89 million -0.8%4.5%6 $33.10
8/15/20254,780,000 shares $170.79 million +4.6%N/A6 $35.73
7/31/20254,570,000 shares $172.75 million +14.8%4.3%5.1 $37.80
7/15/20253,980,000 shares $140.06 million +7,956.7%N/A4.2 $35.19
6/30/202549,400 shares $1.73 million -98.9%1.3%0 $34.97
6/15/20254,390,000 shares $179.99 million -14.1%4.2%3.6 $41.00
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
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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
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 $25.76
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
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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

ZLAB Short Interest - Frequently Asked Questions

Short interest is the volume of Zai Lab shares that have been sold short but have not yet been covered or closed out. As of October 15th, investors have sold 8,843,854 shares of ZLAB short. 8.17% of Zai Lab's shares are currently sold short. Learn More on Zai Lab'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. ZLAB shares currently have a short interest ratio of 11.3. Learn More on Zai Lab'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. 8.17% of Zai Lab's floating shares are currently sold short.

Zai Lab saw a increase in short interest in October. As of October 15th, there was short interest totaling 8,843,854 shares, an increase of 23.7% from the previous total of 7,149,727 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.

8.17% of Zai Lab's shares are currently sold short. Here is how the short interest of companies in the industry of "biotechnology" compare to Zai Lab: BioMarin Pharmaceutical Inc. (6.27%), Madrigal Pharmaceuticals, Inc. (11.53%), Krystal Biotech, Inc. (11.41%), Vaxcyte, Inc. (10.16%), Kymera Therapeutics, Inc. (13.13%), ImmunityBio, Inc. (34.22%), Protagonist Therapeutics, Inc. (16.78%), Spyre Therapeutics, Inc. (14.56%), TG Therapeutics, Inc. (21.21%), Arrowhead Pharmaceuticals, Inc. (8.07%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($71.77 billion), Invesco QQQ ($59.70 billion), iShares Russell 2000 ETF ($23.54 billion), Medtronic PLC ($13.33 billion), SPDR S&P Biotech ETF ($10.47 billion), iShares iBoxx $ High Yield Corporate Bond ETF ($10.36 billion), Nebius Group N.V. ($8.98 billion), iShares 20+ Year Treasury Bond ETF ($8.92 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($8.10 billion), and iShares Semiconductor ETF ($7.74 billion). View all of the most shorted stocks.

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 $0.76 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 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.

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 October, 15 2026.

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

  • 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.


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Short Interest Tools

Short interest data for NASDAQ:ZLAB is sourced from the Financial Industry Regulatory Authority (FINRA), with the most recent report published on 10/26/2026. FINRA publishes updated short interest twice a month.
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