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Proto Labs (PRLB) Short Interest Ratio & Short Volume

Proto Labs logo
$80.57 +2.04 (+2.60%)
As of 01:21 PM Eastern
This is a fair market value price provided by Massive. Learn more.
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Proto Labs Short Interest Overview

As of May 29, 2026, Proto Labs (PRLB) had a short interest of 644,067 shares sold short, representing 2.74% of the public float. This marks a 0.06% increase in short interest since the prior report. The short interest ratio (days to cover) is 3.3, meaning it would take 3.3 days of the average trading volume of 183,233 shares to cover all short positions.

Current Short Interest
644,067 shares
Previous Short Interest
643,691 shares
Change Vs. Previous Month
0.06%
Dollar Volume Sold Short
$48.70 million
Short Interest Ratio
3.3 Days to Cover
Last Record Date
May 29, 2026
Outstanding Shares
23,790,000 shares
Short Percent of Float
2.74%
Today's Trading Volume
88,010 shares
Average Trading Volume
183,233 shares
Today's Volume Vs. Average
48%
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

PRLB Short Interest Over Time

PRLB Days to Cover Over Time

PRLB Percentage of Float Shorted Over Time

Proto Labs 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
5/29/2026644,067 shares $48.70 million +0.1%2.7%3.34 $75.61
5/15/2026643,691 shares $46.28 million +5.0%2.7%2.88 $71.90
4/30/2026612,973 shares $39.71 million -5.4%2.6%4.49 $64.78
4/15/2026647,664 shares $40.94 million +2.7%2.8%4.46 $63.22
3/31/2026630,613 shares $35.80 million +7.5%2.7%3.82 $56.77
3/13/2026586,703 shares $31.86 million +8.5%2.5%3.44 $54.30
2/27/2026540,900 shares $33.47 million +1.0%2.3%3.1 $61.89
2/13/2026535,467 shares $36.11 million +3.8%2.3%1.76 $67.45
1/30/2026515,791 shares $27.18 million +13.0%2.2%2.95 $52.70
1/15/2026456,341 shares $25.06 million -1.1%2.0%3.47 $54.91
12/31/2025461,538 shares $23.37 million -15.0%2.0%2.8 $50.63
12/15/2025542,670 shares $28.44 million -9.8%2.3%4.65 $52.42
11/28/2025601,534 shares $30.57 million -14.4%2.6%3.73 $50.82
11/14/2025703,045 shares $34.05 million +15.4%3.0%2.79 $48.43
10/31/2025609,446 shares $30.28 million +2.8%2.6%2.54 $49.69
10/15/2025593,000 shares $32.74 million -6.1%2.5%3.2 $55.21
9/30/2025631,500 shares $31.66 million -8.3%2.7%3.5 $50.14
9/15/2025688,700 shares $34.20 million +1.2%2.9%3.7 $49.66
8/31/2025680,700 shares $33.82 million +1.9%2.9%3.7 $49.69
8/15/2025668,000 shares $32.12 million +4.8%2.8%3.3 $48.09
7/31/2025637,700 shares $27.42 million -2.9%2.7%3.2 $43.00
7/15/2025656,800 shares $25.90 million -13.6%2.8%3.4 $39.44
6/30/2025760,100 shares $30.40 million -2.4%3.2%3.6 $40.00
6/15/2025778,600 shares $29.22 million -5.1%3.3%3.7 $37.53
5/31/2025820,600 shares $30.37 million -2.4%3.5%3.9 $37.01
5/15/2025840,500 shares $34.12 million +1.8%3.6%4 $40.60
4/30/2025825,600 shares $28.99 million -7.3%3.5%3.5 $35.11
4/15/2025890,800 shares $30.45 million +10.6%3.8%3.7 $34.18
3/31/2025805,800 shares $28.25 million +14.3%3.4%3.5 $35.06
3/15/2025705,100 shares $25.76 million -6.7%3.0%2.8 $36.53
2/28/2025755,400 shares $30.09 million +11.8%3.2%2.9 $39.84
2/15/2025676,000 shares $29.88 million +13.6%2.8%2.6 $44.20
1/31/2025594,900 shares $24.80 million -11.2%2.5%2.2 $41.68
1/15/2025669,900 shares $25.55 million -1.8%2.8%2.4 $38.14
12/31/2024682,100 shares $26.66 million -23.6%2.8%2.5 $39.09
12/15/2024892,800 shares $38.92 million +14.2%3.7%3.2 $43.59
11/30/2024781,500 shares $32.19 million +9.9%3.2%2.8 $41.19
11/15/2024711,000 shares $26.64 million -29.6%2.9%2.6 $37.47
10/31/20241,010,000 shares $27.67 million +3.8%4.2%3.7 $27.40
10/15/2024973,400 shares $27.61 million -1.9%3.9%4 $28.36
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9/30/2024991,800 shares $29.13 million +42.5%4.0%4.1 $29.37
9/15/2024695,800 shares $20.57 million +1.8%2.8%2.9 $29.57
8/31/2024683,400 shares $20.90 million +6.8%2.8%3.2 $30.58
8/15/2024639,700 shares $19.20 million +32.1%2.6%3.3 $30.01
7/31/2024484,200 shares $16.86 million +1.3%1.9%2.7 $34.82
7/15/2024478,100 shares $15.50 million +6.4%1.9%3.1 $32.42
6/30/2024449,400 shares $13.88 million -14.2%1.8%3 $30.89
6/15/2024524,000 shares $15.99 million -7.6%2.1%3.6 $30.51
5/31/2024566,900 shares $17.56 million +3.8%2.3%4.2 $30.97
5/15/2024546,100 shares $18.11 million +11.8%2.2%3.8 $33.16
4/30/2024488,300 shares $14.88 million -1.1%1.9%2.9 $30.48
4/15/2024493,700 shares $15.69 million -5.4%1.9%3 $31.79
3/31/2024521,600 shares $18.65 million -15.9%2.1%3.1 $35.75
3/15/2024620,100 shares $21.11 million +7.2%2.4%3.8 $34.05
2/29/2024578,600 shares $21.08 million +22.1%2.3%3.1 $36.43
2/15/2024473,800 shares $17.47 million -4.2%1.9%2.6 $36.87
1/31/2024494,300 shares $17.81 million +6.1%1.9%2.6 $36.04
1/15/2024466,100 shares $16.83 million -2.0%1.8%2.2 $36.10
12/31/2023475,600 shares $18.53 million -24.3%1.9%2.3 $38.96
12/15/2023628,200 shares $23.76 million -1.4%2.5%3 $37.82
11/30/2023637,000 shares $23.06 million -3.6%2.5%3.3 $36.20
11/15/2023661,000 shares $23.88 million +28.8%2.6%3.6 $36.13
10/31/2023513,100 shares $12.11 million -30.0%2.0%3.1 $23.61
10/15/2023733,100 shares $18.76 million -12.9%2.8%4.7 $25.59
9/30/2023841,700 shares $22.22 million -7.3%3.3%5.6 $26.40
9/15/2023907,500 shares $24.43 million +2.4%3.5%5.5 $26.92
8/31/2023885,900 shares $26.14 million +21.0%3.4%5.1 $29.51
8/15/2023732,300 shares $21.17 million -1.4%2.8%4.2 $28.91
7/31/2023742,300 shares $24.61 million -7.2%2.9%4.1 $33.15
7/15/2023800,200 shares $27.83 million -5.7%3.1%4.7 $34.78
6/30/2023848,600 shares $29.67 million -16.0%3.3%4.9 $34.96
6/15/20231,010,000 shares $35.41 million -1.0%3.9%5.9 $35.06
5/31/20231,020,000 shares $31.38 million +4.4%3.9%5.7 $30.76
5/15/2023976,600 shares $30.55 million +1.1%3.8%5 $31.28
4/30/2023966,000 shares $27.79 million -2.7%3.7%4.2 $28.77
4/15/2023992,800 shares $30.22 million +3.3%3.8%4.2 $30.44
3/31/2023960,900 shares $31.85 million -16.4%3.6%4 $33.15
3/15/20231,150,000 shares $36.85 million +6.5%4.4%4.7 $32.04
2/28/20231,080,000 shares $33.96 million +6.9%4.1%4.2 $31.44
2/15/20231,010,000 shares $34.29 million +7.7%3.8%3.7 $33.95
1/31/2023938,100 shares $28.71 million +5.4%3.5%3.3 $30.60
1/15/2023889,800 shares $24.49 million -3.1%3.3%3 $27.52
12/30/2022918,400 shares $23.45 million +14.0%3.4%3.1 $25.53
12/15/2022805,900 shares $20.43 million -12.4%3.0%2.7 $25.35
11/30/2022919,900 shares $24.40 million -9.8%3.4%3.4 $26.52
11/15/20221,020,000 shares $24.05 million +8.3%3.8%4 $23.58
10/31/2022942,300 shares $35.99 million -0.3%3.5%4.4 $38.19
10/15/2022945,300 shares $33.68 million -9.1%3.5%5.3 $35.63
9/30/20221,040,000 shares $37.89 million +17.5%3.8%6.2 $36.43
9/15/2022885,500 shares $34.06 million -5.6%3.3%5.4 $38.46
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8/31/2022937,600 shares $36.00 million +9.9%3.4%5.5 $38.40
8/15/2022852,900 shares $39.26 million -2.3%3.1%5.1 $46.03
7/31/2022872,500 shares $42.66 million -5.5%3.5%4.7 $48.89
7/15/2022923,200 shares $43.29 million -4.5%3.7%4.9 $46.89
6/30/2022967,000 shares $46.26 million +2.3%3.9%5 $47.84
6/15/2022945,000 shares $43.86 million +7.2%3.8%4.6 $46.41
5/31/2022881,600 shares $42.48 million -3.3%3.2%4.5 $48.19
5/15/2022912,100 shares $39.18 million -1.6%3.4%4.4 $42.96
4/30/2022927,300 shares $39.51 million +4.7%3.4%4.1 $42.61
4/15/2022886,100 shares $41.94 million -21.6%3.3%3.7 $47.33
3/31/20221,130,000 shares $59.78 million -6.6%4.2%4.4 $52.90
3/15/20221,210,000 shares $59.42 million -10.4%4.5%4.5 $49.11
2/28/20221,350,000 shares $75.91 million +3.1%5.0%4.2 $56.23
2/15/20221,310,000 shares $77.81 million -2.2%4.8%3.4 $59.40
1/31/20221,340,000 shares $67.24 million -14.7%4.9%3.4 $50.18
1/15/20221,570,000 shares $79.00 million -8.7%5.7%3.3 $50.32
12/31/20211,720,000 shares $88.32 million No Change6.3%3.3 $51.35
12/15/20211,720,000 shares $89.42 million -31.8%6.3%3.2 $51.99
11/30/20212,520,000 shares $126.30 million -6.7%9.2%5 $50.12
11/15/20212,700,000 shares $157.41 million +0.4%9.9%5.9 $58.30
10/29/20212,690,000 shares $160.89 million -9.7%9.8%6 $59.81
10/15/20212,980,000 shares $211.04 million +11.2%10.8%7.8 $70.82
9/30/20212,680,000 shares $178.49 million -1.5%9.7%8.2 $66.60
9/15/20212,720,000 shares $191.65 million -3.2%9.9%8.2 $70.46
8/31/20212,810,000 shares $208.39 million +8.9%10.2%8.5 $74.16
8/13/20212,580,000 shares $203.82 million +8.4%9.4%7.3 $79.00
7/30/20212,380,000 shares $186.09 million +0.4%8.6%6 $78.19
7/15/20212,370,000 shares $200.50 million -12.6%8.6%5.8 $84.60
6/30/20212,710,000 shares $248.78 million -5.6%9.9%6.3 $91.80

PRLB Short Interest - Frequently Asked Questions

Short interest is the volume of Proto Labs shares that have been sold short but have not yet been covered or closed out. As of May 29th, investors have sold 644,067 shares of PRLB short. 2.74% of Proto Labs' shares are currently sold short. Learn More on Proto Labs' 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. PRLB shares currently have a short interest ratio of 3.3. Learn More on Proto Labs'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. 2.74% of Proto Labs' floating shares are currently sold short.

Proto Labs saw a increase in short interest in May. As of May 29th, there was short interest totaling 644,067 shares, an increase of 0.1% from the previous total of 643,691 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.

2.74% of Proto Labs' shares are currently sold short. Here is how the short interest of companies in the industry of "industrial machinery" compare to Proto Labs: Enpro Inc. (1.83%), Mueller Water Products (2.25%), Standex International Corporation (6.59%), Kadant Inc (8.56%), Kennametal Inc. (5.95%), Gorman-Rupp Company (The) (2.09%), Albany International Corporation (1.62%), Tennant Company (7.32%), TriMas Corporation (15.03%), Graham Corporation (3.72%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($81.27 billion), Invesco QQQ ($49.06 billion), iShares Russell 2000 ETF ($23.61 billion), Western Digital Corporation ($16.93 billion), Sandisk Corporation ($15.61 billion), Salesforce Inc. ($11.65 billion), SPDR S&P Biotech ETF ($10.52 billion), Nebius Group N.V. ($10.24 billion), Lumentum Holdings Inc. ($8.74 billion), and iShares iBoxx $ High Yield Corporate Bond ETF ($8.21 billion). View all of the most shorted stocks.

Short selling PRLB is an investing strategy that aims to generate trading profit from Proto Labs as its price is falling. PRLB shares are trading up $2.18 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 Proto Labs 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 PRLB, 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 PRLB, twice per month. The most recent reporting period available is May, 29 2026.

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

  • 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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This page (NYSE:PRLB) was last updated on 6/16/2026 by MarketBeat.com Staff.
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