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Vaxcyte (PCVX) Short Interest Ratio & Short Volume

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$62.62 +1.28 (+2.09%)
As of 08/21/2026 04:00 PM Eastern
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Vaxcyte Short Interest Overview

As of July 31, 2026, Vaxcyte (PCVX) had a short interest of 14.46 million shares sold short, representing 10.36% of the public float. This marks a 1.64% increase in short interest since the prior report. The short interest ratio (days to cover) is 14.8, meaning it would take 14.8 days of the average trading volume of 965,036 shares to cover all short positions.

Current Short Interest
14,464,951 shares
Previous Short Interest
14,231,919 shares
Change Vs. Previous Month
1.64%
Dollar Volume Sold Short
$782.26 million
Short Interest Ratio
14.8 Days to Cover
Last Record Date
July 31, 2026
Outstanding Shares
148,800,000 shares
Short Percent of Float
10.36%
Today's Trading Volume
1,141,513 shares
Average Trading Volume
965,036 shares
Today's Volume Vs. Average
118%
Short Selling Vaxcyte?
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

PCVX Short Interest Over Time

PCVX Days to Cover Over Time

PCVX Percentage of Float Shorted Over Time

Vaxcyte 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
7/31/202614,464,951 shares $782.26 million +1.6%10.4%14.82 $54.08
7/15/202614,231,919 shares $807.52 million -18.5%10.2%12.37 $56.74
6/30/202617,468,070 shares $1.02 billion +19.4%12.5%6.91 $58.13
6/15/202614,629,103 shares $725.02 million +1.1%10.5%10.73 $49.56
5/29/202614,473,801 shares $743.95 million +5.0%10.4%8.85 $51.40
5/15/202613,789,778 shares $722.45 million -2.5%9.9%7.75 $52.39
4/30/202614,143,473 shares $809.57 million -1.5%10.1%13.09 $57.24
4/15/202614,356,548 shares $867.85 million +4.9%10.3%11.75 $60.45
3/31/202613,685,643 shares $795.27 million +4.7%9.8%9.77 $58.11
3/13/202613,067,798 shares $713.24 million -1.4%9.4%10.89 $54.58
2/27/202613,257,134 shares $818.50 million -3.6%9.5%10.72 $61.74
2/13/202613,755,621 shares $744.18 million +15.1%9.9%7.85 $54.10
1/30/202611,953,116 shares $640.33 million -1.2%9.4%7.51 $53.57
1/15/202612,095,806 shares $581.08 million +1.6%9.5%12.49 $48.04
12/31/202511,905,942 shares $549.34 million +10.0%9.4%9.81 $46.14
12/15/202510,827,314 shares $480.08 million +5.1%8.5%6.62 $44.34
11/28/202510,301,208 shares $511.35 million +10.3%8.1%7.67 $49.64
11/14/20259,336,796 shares $454.61 million +8.9%7.4%6.34 $48.69
10/31/20258,574,767 shares $388.27 million -14.4%6.8%6.57 $45.28
10/15/202510,010,000 shares $439.84 million -9.7%8.0%5.9 $43.94
9/30/202511,080,000 shares $399.10 million -2.5%N/A6.9 $36.02
9/15/202511,360,000 shares $352.16 million -1.3%N/A7.3 $31.00
8/31/202511,510,000 shares $354.39 million +0.6%9.1%8 $30.79
8/15/202511,440,000 shares $374.09 million -14.0%N/A7.5 $32.70
7/31/202513,300,000 shares $451.54 million -2.4%10.6%8.1 $33.95
7/15/202513,620,000 shares $480.51 million -3.2%N/A7.6 $35.28
6/30/202514,070,000 shares $457.42 million +2.7%11.3%6.7 $32.51
6/15/202513,700,000 shares $473.47 million +3.8%11.0%5.5 $34.56
5/31/202513,200,000 shares $430.32 million -2.2%10.9%5.4 $32.60
5/15/202513,490,000 shares $416.84 million +12.0%11.2%5.5 $30.90
4/30/202512,040,000 shares $431.51 million -2.4%N/A5.6 $35.84
4/15/202512,340,000 shares $373.04 million +2.4%10.2%6.3 $30.23
3/31/202512,050,000 shares $455.01 million -4.4%10.0%6.6 $37.76
3/15/202512,610,000 shares $937.81 million +2.3%10.4%10.9 $74.37
2/28/202512,330,000 shares $900.34 million -7.5%10.2%10.7 $73.02
2/15/202513,330,000 shares $1.12 billion -1.5%11.0%12 $84.00
1/31/202513,530,000 shares $1.19 billion -6.6%N/A10.3 $88.32
1/15/202514,490,000 shares $1.29 billion +1.2%N/A11.4 $89.29
12/31/202414,320,000 shares $1.17 billion +13.7%N/A12.7 $81.86
12/15/202412,600,000 shares $1.11 billion +14.2%N/A11.4 $87.72
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11/30/202411,030,000 shares $1.04 billion +13.8%N/A10.4 $94.34
11/15/20249,690,000 shares $841.38 million +8.5%N/A7.6 $86.83
10/31/20248,930,000 shares $949.71 million -4.4%N/A9.2 $106.35
10/15/20249,340,000 shares $1.08 billion -3.2%N/A10.2 $115.49
9/30/20249,650,000 shares $1.10 billion -0.6%N/A10 $114.27
9/15/20249,710,000 shares $1.13 billion -5.7%N/A9.4 $116.00
8/31/202410,300,000 shares $831.83 million -8.4%N/A10.4 $80.76
8/15/202411,240,000 shares $881.67 million -2.3%N/A15.9 $78.44
7/31/202411,500,000 shares $907.24 million -3.1%N/A15.4 $78.89
7/15/202411,870,000 shares $999.10 million +15.5%N/A16.2 $84.17
6/30/202410,280,000 shares $776.24 million +6.2%N/A14.6 $75.51
6/15/20249,680,500 shares $706.10 million +0.8%N/A14.9 $72.94
5/31/20249,600,000 shares $674.59 million +0.8%N/A15.3 $70.27
5/15/20249,520,000 shares $681.92 million +12.9%N/A13.7 $71.63
4/30/20248,430,000 shares $510.44 million +2.3%N/A11.7 $60.55
4/15/20248,240,000 shares $514.09 million -0.2%N/A9.7 $62.39
3/31/20248,260,000 shares $564.24 million -3.8%N/A9.6 $68.31
3/15/20248,590,000 shares $598.72 million +1.5%N/A9.9 $69.70
2/29/20248,460,000 shares $624.52 million -20.6%N/A9.3 $73.82
2/15/202410,650,000 shares $798.86 million +19.7%N/A12.3 $75.01
1/31/20248,900,000 shares $635.64 million +6.5%N/A10.7 $71.42
1/15/20248,360,000 shares $507.62 million +9.7%N/A12.4 $60.72
12/31/20237,620,000 shares $478.54 million +3.7%N/A11.6 $62.80
12/15/20237,350,000 shares $445.12 million +3.8%N/A11.6 $60.56
11/30/20237,080,000 shares $366.53 million -2.6%N/A11.5 $51.77
11/15/20237,270,000 shares $369.32 million -0.8%N/A12.6 $50.80
10/31/20237,330,000 shares $352.57 million +6.2%N/A12.7 $48.10
10/15/20236,900,000 shares $317.40 million -4.2%N/A12.8 $46.00
9/30/20237,200,000 shares $367.06 million -9.1%N/A13.5 $50.98
9/15/20237,920,000 shares $409.62 million +4.9%N/A14.9 $51.72
8/31/20237,550,000 shares $392.00 million -2.6%N/A13.9 $51.92
8/15/20237,750,000 shares $368.05 million +3.6%N/A13.6 $47.49
7/31/20237,480,000 shares $359.49 million -0.1%N/A12.3 $48.06
7/15/20237,490,000 shares $371.80 million +0.4%N/A10.2 $49.64
6/30/20237,460,000 shares $372.55 million +8.4%N/A8.1 $49.94
6/15/20236,880,000 shares $358.72 million -2.7%N/A7.2 $52.14
5/31/20237,070,000 shares $350.11 million +4.0%N/A7.5 $49.52
5/15/20236,800,000 shares $342.45 million +3.8%N/A7 $50.36
4/30/20236,550,000 shares $280.54 million -7.1%N/A7 $42.83
4/15/20237,050,000 shares $257.33 million +17.3%N/A8.1 $36.50
3/31/20236,010,000 shares $225.25 million +6.0%N/A8.8 $37.48
3/15/20235,670,000 shares $220.56 million +14.8%N/A8.3 $38.90
2/28/20234,940,000 shares $202.39 million +4.7%N/A7 $40.97
2/15/20234,720,000 shares $203.67 million +1.5%N/A6.6 $43.15
1/31/20234,650,000 shares $210.88 million +5.9%N/A6 $45.35
1/15/20234,390,000 shares $195.88 million -2.0%N/A3.3 $44.62
12/30/20224,480,000 shares $214.82 million +30.2%N/A3.4 $47.95
12/15/20223,440,000 shares $156.45 million +3.6%N/A2.6 $45.48
11/30/20223,320,000 shares $152.92 million -8.8%N/A2.7 $46.06
11/15/20223,640,000 shares $160.31 million -12.3%N/A3.1 $44.04
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10/31/20224,150,000 shares $180.98 million +29.7%N/A3.7 $43.61
10/15/20223,200,000 shares $78.59 million +29.0%8.2%4.2 $24.56
9/30/20222,480,000 shares $59.52 million +22.8%6.3%5.7 $24.00
9/15/20222,020,000 shares $57.00 million +10.4%5.2%5.1 $28.22
8/31/20221,830,000 shares $47.87 million -12.9%4.7%4.8 $26.16
8/15/20222,100,000 shares $54.68 million +4.5%5.4%5.5 $26.04
7/31/20222,010,000 shares $46.39 million -1.0%5.3%5.4 $23.08
7/15/20222,030,000 shares $50.53 million +9.7%5.4%5.6 $24.89
6/30/20221,850,000 shares $40.26 million +11.5%4.9%5 $21.76
6/15/20221,660,000 shares $31.04 million -18.2%4.4%4.4 $18.70
5/31/20222,030,000 shares $48.70 million +2.0%5.4%6.3 $23.99
5/15/20221,990,000 shares $46.82 million +4.2%5.3%7 $23.53
4/30/20221,910,000 shares $46.24 million +2.7%5.2%6.9 $24.21
4/15/20221,860,000 shares $45.63 million -6.5%5.0%6.6 $24.53
3/31/20221,990,000 shares $48.06 million -0.5%5.6%6.3 $24.15
3/15/20222,000,000 shares $49.78 million -1.5%5.6%6.9 $24.89
2/28/20222,030,000 shares $47.04 million +9.7%5.7%7 $23.17
2/15/20221,850,000 shares $38.31 million +12.8%5.3%6.4 $20.71
1/31/20221,640,000 shares $31.23 million +28.1%5.1%6.2 $19.04
1/15/20221,280,000 shares $24.87 million +14.3%4.0%5.5 $19.43
12/31/20211,120,000 shares $26.64 million -21.7%3.7%7 $23.79
12/15/20211,430,000 shares $32.02 million +26.6%4.7%9.5 $22.39
11/30/20211,130,000 shares $23.03 million -7.4%3.8%7.5 $20.38
11/15/20211,220,000 shares $31.82 million -6.9%4.1%8.1 $26.08
10/29/20211,310,000 shares $30.65 million +2.3%4.5%8 $23.40
10/15/20211,280,000 shares $31.24 million -9.9%4.3%7.8 $24.41
9/30/20211,420,000 shares $36.03 million -20.7%4.8%8.4 $25.37
9/15/20211,790,000 shares $47.35 million -23.5%6.1%9 $26.45
8/31/20212,340,000 shares $61.38 million -17.6%8.0%11.2 $26.23

PCVX Short Interest - Frequently Asked Questions

Short interest is the volume of Vaxcyte shares that have been sold short but have not yet been covered or closed out. As of July 31st, investors have sold 14,464,951 shares of PCVX short. 10.36% of Vaxcyte's shares are currently sold short. Learn More on Vaxcyte'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. PCVX shares currently have a short interest ratio of 14.8. Learn More on Vaxcyte'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. 10.36% of Vaxcyte's floating shares are currently sold short.

Vaxcyte saw a increase in short interest during the month of July. As of July 31st, there was short interest totaling 14,464,951 shares, an increase of 1.6% from the previous total of 14,231,919 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.

10.36% of Vaxcyte's shares are currently sold short. Here is how the short interest of companies in the industry of "biotechnology" compare to Vaxcyte: Biogen Inc. (3.70%), Alnylam Pharmaceuticals, Inc. (3.62%), Insmed, Inc. (5.31%), Roivant Sciences Ltd. (5.37%), Moderna, Inc. (13.98%), Incyte Corporation (6.03%), BioNTech SE Sponsored ADR (1.21%), United Therapeutics Corporation (5.92%), Genmab A/S Sponsored ADR (1.20%), BridgeBio Pharma, Inc. (13.92%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($70.50 billion), Invesco QQQ ($50.36 billion), iShares Russell 2000 ETF ($21.20 billion), Western Digital Corporation ($13.40 billion), SPDR S&P Biotech ETF ($11.59 billion), Nebius Group N.V. ($11.46 billion), iShares 20+ Year Treasury Bond ETF ($7.84 billion), iShares iBoxx $ High Yield Corporate Bond ETF ($7.51 billion), iShares Semiconductor ETF ($6.37 billion), and Financial Select Sector SPDR Fund ($6.34 billion). View all of the most shorted stocks.

Short selling PCVX is an investing strategy that aims to generate trading profit from Vaxcyte as its price is falling. PCVX shares are trading up $1.28 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 Vaxcyte 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 PCVX, 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 PCVX, twice per month. The most recent reporting period available is July, 31 2026.

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

  • 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 data for NASDAQ:PCVX is sourced from the Financial Industry Regulatory Authority (FINRA), with the most recent report published on 8/11/2026. FINRA publishes updated short interest twice a month.
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