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ACM Research (ACMR) Short Interest Ratio & Short Volume

ACM Research logo
$77.30 +1.12 (+1.47%)
Closing price 09/25/2026 04:00 PM Eastern
Extended Trading
$77.75 +0.45 (+0.58%)
As of 09/25/2026 07:59 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 Massive. Learn more.
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ACM Research Short Interest Overview

As of September 15, 2026, ACM Research (ACMR) had a short interest of 4.14 million shares sold short, representing 8.46% of the public float. This marks a 4.17% increase in short interest since the prior report. The short interest ratio (days to cover) is 4.6, meaning it would take 4.6 days of the average trading volume of 1.06 million shares to cover all short positions.

Current Short Interest
4,136,685 shares
Previous Short Interest
3,970,966 shares
Change Vs. Previous Month
4.17%
Dollar Volume Sold Short
$264.50 million
Short Interest Ratio
4.6 Days to Cover
Last Record Date
September 15, 2026
Outstanding Shares
64,660,000 shares
Short Percent of Float
8.46%
Today's Trading Volume
594,909 shares
Average Trading Volume
1,057,586 shares
Today's Volume Vs. Average
56%
Short Selling ACM Research?
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

ACMR Short Interest Over Time

ACMR Days to Cover Over Time

ACMR Percentage of Float Shorted Over Time

ACM Research 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
9/15/20264,136,685 shares $264.50 million +4.2%8.5%4.64 $63.94
8/31/20263,970,966 shares $289.17 million +20.9%8.1%4.37 $72.82
8/14/20263,285,493 shares $264.22 million -8.8%6.7%4.05 $80.42
7/31/20263,603,818 shares $282.79 million -7.9%7.8%3.35 $78.47
7/15/20263,911,207 shares $359.67 million +20.5%8.4%2.85 $91.96
6/30/20263,246,092 shares $411.90 million +37.6%7.0%1.53 $126.89
6/15/20262,359,065 shares $224.61 million -21.7%5.1%1.48 $95.21
5/29/20263,011,862 shares $260.71 million +7.6%6.5%1.55 $86.56
5/15/20262,798,382 shares $178.17 million +2.1%6.1%1.5 $63.67
4/30/20262,739,731 shares $141.62 million +2.8%6.0%2.39 $51.69
4/15/20262,666,276 shares $132.75 million -14.5%5.8%3.11 $49.79
3/31/20263,119,153 shares $122.74 million -2.7%6.7%3.1 $39.35
3/13/20263,205,331 shares $148.66 million -4.6%7.0%2.18 $46.38
2/27/20263,359,553 shares $187.06 million -8.0%7.3%2.47 $55.68
2/13/20263,651,167 shares $236.74 million +20.1%7.9%2 $64.84
1/30/20263,041,416 shares $176.77 million -15.4%6.8%2.28 $58.12
1/15/20263,596,723 shares $187.71 million -13.4%8.0%2.12 $52.19
12/31/20254,154,305 shares $163.89 million -9.9%9.3%3.58 $39.45
12/15/20254,612,207 shares $174.02 million +5.6%10.3%3.8 $37.73
11/28/20254,367,150 shares $145.80 million -3.3%9.7%4.69 $33.39
11/14/20254,515,245 shares $142.28 million +12.3%10.2%2.34 $31.51
10/31/20254,022,370 shares $166.77 million -8.9%9.1%4.44 $41.46
10/15/20254,410,000 shares $173.40 million -17.7%9.9%2.5 $39.32
9/30/20255,360,000 shares $209.74 million +25.2%N/A3.2 $39.13
9/15/20254,280,000 shares $127.67 million +3.9%N/A3 $29.83
8/31/20254,120,000 shares $116.27 million +2.5%9.3%3.6 $28.22
8/15/20254,020,000 shares $100.58 million +28.0%N/A3.7 $25.02
7/31/20253,140,000 shares $95.33 million -2.8%7.1%3 $30.36
7/15/20253,230,000 shares $95.16 million -3.3%N/A3 $29.46
6/30/20253,340,000 shares $86.51 million -11.6%7.6%2.7 $25.90
6/15/20253,780,000 shares $92.12 million +8.6%8.6%2.7 $24.37
5/31/20253,480,000 shares $77.88 million -6.0%8.8%2.3 $22.38
5/15/20253,700,000 shares $90.02 million -18.9%9.3%2.1 $24.33
4/30/20254,560,000 shares $88.78 million +38.2%N/A2.4 $19.47
4/15/20253,300,000 shares $67.65 million -2.1%8.3%1.8 $20.50
3/31/20253,370,000 shares $78.66 million -4.8%8.5%1.9 $23.34
3/15/20253,540,000 shares $103.30 million -10.4%8.9%2.2 $29.18
2/28/20253,950,000 shares $102.46 million -3.9%10.0%2.4 $25.94
2/15/20254,110,000 shares $97.74 million +17.8%10.4%2.6 $23.78
1/31/20253,490,000 shares $71.72 million -16.7%N/A2.4 $20.55
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10/31/20244,550,000 shares $85.52 million -8.1%N/A3.5 $18.80
10/15/20244,950,000 shares $96.87 million +4.7%N/A3.5 $19.57
9/30/20244,730,000 shares $96.02 million -4.6%N/A3.2 $20.30
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8/31/20244,600,000 shares $82.98 million +0.2%N/A3.5 $18.04
8/15/20244,590,000 shares $93.22 million +2.0%N/A3.5 $20.31
7/31/20244,500,000 shares $80.78 million +13.9%N/A3.2 $17.95
7/15/20243,950,000 shares $100.80 million -6.8%N/A3.2 $25.52
6/30/20244,240,000 shares $97.77 million +5.0%N/A3.5 $23.06
6/15/20244,040,000 shares $95.10 million +3.1%N/A3.3 $23.54
5/31/20243,920,000 shares $84.67 million -3.5%N/A3.1 $21.60
5/15/20244,060,000 shares $96.91 million +7.1%N/A2.4 $23.87
4/30/20243,790,000 shares $96.72 million -6.7%N/A2.2 $25.52
4/15/20244,060,000 shares $114.53 million +12.2%N/A2.4 $28.21
3/31/20243,620,000 shares $105.49 million +11.4%N/A2 $29.14
3/15/20243,250,000 shares $88.11 million -32.3%N/A1.9 $27.11
2/29/20244,800,000 shares $148.42 million +33.0%N/A3.1 $30.92
2/15/20243,610,000 shares $72.09 million -2.7%N/A3.2 $19.97
1/31/20243,710,000 shares $63.89 million +4.5%N/A3.6 $17.22
1/15/20243,550,000 shares $77.43 million +14.5%N/A3 $21.81
12/31/20233,100,000 shares $60.57 million -4.3%N/A2.6 $19.54
12/15/20233,240,000 shares $58.00 million +13.3%N/A2.8 $17.90
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11/15/20232,960,000 shares $53.99 million +0.7%N/A2.4 $18.24
10/31/20232,940,000 shares $39.98 million +11.8%N/A2.3 $13.60
10/15/20232,630,000 shares $49.97 million +7.8%N/A2.5 $19.00
9/30/20232,440,000 shares $44.18 million +22.6%N/A2.8 $18.11
9/15/20231,990,000 shares $30.88 million +10.6%N/A2.4 $15.52
8/31/20231,800,000 shares $31.61 million -11.3%N/A2.2 $17.56
8/15/20232,030,000 shares $27.30 million +3.6%N/A2.8 $13.45
7/31/20231,960,000 shares $25.68 million No ChangeN/A2.9 $13.10
7/15/20231,960,000 shares $26.13 million -4.4%N/A3.1 $13.33
6/30/20232,050,000 shares $26.81 million -6.8%N/A3.3 $13.08
6/15/20232,200,000 shares $25.12 million +2.3%N/A4 $11.42
5/31/20232,150,000 shares $21.74 million -3.6%N/A3.9 $10.11
5/15/20232,230,000 shares $21.61 million +7.7%N/A3.5 $9.69
4/30/20232,070,000 shares $19.35 million -6.3%N/A3.1 $9.35
4/15/20232,210,000 shares $23.32 million -5.2%N/A3.1 $10.55
3/31/20232,330,000 shares $27.26 million +1.3%N/A3 $11.70
3/15/20232,300,000 shares $28.18 million -3.4%N/A2.6 $12.25
2/28/20232,380,000 shares $24.70 million -17.4%N/A2.6 $10.38
2/15/20232,880,000 shares $40.84 million +5.1%N/A3.5 $14.18
1/31/20232,740,000 shares $34.22 million +0.4%N/A3.2 $12.49
1/15/20232,730,000 shares $29.54 million -4.9%N/A2.7 $10.82
12/30/20222,870,000 shares $22.13 million -42.8%N/A2.5 $7.71
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10/15/20224,530,000 shares $36.15 million -7.9%N/A5.3 $7.98
9/30/20224,920,000 shares $61.30 million -1.2%N/A6.9 $12.46
9/15/20224,980,000 shares $78.09 million -5.3%N/A5.8 $15.68
8/31/20225,260,000 shares $88.84 million -14.3%N/A5.9 $16.89
8/15/20226,140,000 shares $120.41 million -8.9%N/A6.9 $19.61
7/31/20226,740,000 shares $113.77 million -14.0%N/A7.7 $16.88
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6/30/20226,510,000 shares $109.56 million +52.1%N/A7.5 $16.83
6/15/20224,280,000 shares $61.85 million -5.7%N/A5 $14.45
5/31/20224,540,000 shares $68.83 million +14.1%N/A4.2 $15.16
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3/31/20224,290,000 shares $88.76 million -8.9%N/A4.1 $20.69
3/15/20224,710,000 shares $74.26 million +299.2%N/A4.7 $15.77
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ACMR Short Interest - Frequently Asked Questions

Short interest is the volume of ACM Research shares that have been sold short but have not yet been covered or closed out. As of September 15th, investors have sold 4,136,685 shares of ACMR short. 8.46% of ACM Research's shares are currently sold short. Learn More on ACM Research'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. ACMR shares currently have a short interest ratio of 4.6. Learn More on ACM Research'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. 8.46% of ACM Research's floating shares are currently sold short.

ACM Research saw a increase in short interest in the month of September. As of September 15th, there was short interest totaling 4,136,685 shares, an increase of 4.2% from the previous total of 3,970,966 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.

8.46% of ACM Research's shares are currently sold short. Here is how the short interest of companies in the industry of "semiconductors & semiconductor equipment" compare to ACM Research: Applied Materials, Inc. (1.78%), Lam Research Corporation (2.09%), MKS Inc. (9.04%), Onto Innovation Inc. (5.61%), Nova Ltd. (7.07%), FormFactor, Inc. (4.16%), Camtek Ltd. (38.85%), AXT Inc (14.29%), Kulicke and Soffa Industries, Inc. (4.33%), Enphase Energy, Inc. (18.61%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($75.21 billion), Invesco QQQ ($46.31 billion), iShares Russell 2000 ETF ($27.98 billion), SPDR S&P Biotech ETF ($11.59 billion), Nebius Group N.V. ($9.70 billion), Canadian Natural Resources Limited ($9.42 billion), iShares 20+ Year Treasury Bond ETF ($8.70 billion), iShares iBoxx $ High Yield Corporate Bond ETF ($8.53 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($7.79 billion), and Financial Select Sector SPDR Fund ($7.74 billion). View all of the most shorted stocks.

Short selling ACMR is an investing strategy that aims to generate trading profit from ACM Research as its price is falling. ACMR shares are trading up $1.12 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 ACM Research 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 ACMR, 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 ACMR, twice per month. The most recent reporting period available is September, 15 2026.

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

  • 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:ACMR is sourced from the Financial Industry Regulatory Authority (FINRA), with the most recent report published on 9/24/2026. FINRA publishes updated short interest twice a month.
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