Harmonic Drive Systems (HSYDF) Short Interest Ratio & Short Volume $20.41 +0.41 (+2.06%) As of 10/16/2025 12:52 PM Eastern Add Compare Share Share Short Interest Stock AnalysisChartHeadlinesShort InterestBuy This Stock Harmonic Drive Systems Short Interest DataHarmonic Drive Systems (HSYDF) has a short interest of 444,400 shares. This marks a 69.23% increase in short interest from the previous month. The short interest ratio (days to cover) is 1,110.9, indicating that it would take 1,110.9 days of the average trading volume of 406 shares to cover all short positions.Current Short Interest444,400 sharesPrevious Short Interest262,600 sharesChange Vs. Previous Month+69.23%Dollar Volume Sold Short$8.22 millionShort Interest Ratio1,110.9 Days to CoverLast Record DateSeptember 30, 2025Today's Trading Volume25 sharesAverage Trading Volume406 sharesToday's Volume Vs. Average6% Short Selling Harmonic Drive Systems? 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Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartHSYDF Short Interest Over TimeHSYDF Days to Cover Over TimeHSYDF Percentage of Float Shorted Over Time Harmonic Drive Systems Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 9/30/2025444,400 shares $8.22 million +69.2%N/A1110.9 $18.49 9/15/2025262,600 shares $4.86 million -9.9%N/A375.1 $18.50 8/31/2025291,400 shares $4.95 million +8.9%N/A1457 $17.00 8/15/2025267,500 shares $4.98 million +8.7%N/A891.7 $18.62 7/31/2025246,000 shares $4.68 million -18.7%N/A820 $19.04 7/15/2025302,700 shares $5.23 million -35.5%N/A189.2 $17.27 6/30/2025469,200 shares $9.41 million -14.2%N/A521.3 $20.06 6/15/2025546,600 shares $11.65 million -32.9%N/A2733 $21.31 5/31/2025815,000 shares $18.42 million -23.1%N/A4075 $22.60 5/15/20251,060,000 shares $25.57 million -7.7%N/A10600 $24.12 Get the Latest News and Ratings for HSYDF and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Harmonic Drive Systems and its competitors with MarketBeat's FREE daily newsletter. 4/30/20251,148,100 shares $21.90 million +43.6%N/A0 $19.08 4/15/2025799,600 shares $16.43 million -12.0%N/A1142.3 $20.55 3/31/2025908,400 shares $19.98 million -13.6%N/A9084 $22.00 3/15/20251,051,900 shares $26.30 million -24.0%N/A2629.8 $25.00 2/28/20251,383,900 shares $43.04 million +10.1%N/A3459.8 $31.10 2/15/20251,257,200 shares $38.72 million -13.0%N/A1257.2 $30.80 1/31/20251,445,300 shares $43.36 million -3.0%N/A1806.6 $30.00 1/15/20251,489,600 shares $35.75 million +44.6%N/A3724 $24.00 12/31/20241,030,000 shares $22.45 million +23.1%N/A10300 $21.80 12/15/2024836,700 shares $10.63 million +16.4%N/A0 $12.70 11/30/2024719,100 shares $9.13 million No ChangeN/A7191 $12.70 11/15/2024719,100 shares $13.30 million -16.7%N/A7191 $18.50 10/31/2024863,000 shares $15.92 million +6.9%N/A8630 $18.45 10/15/2024807,000 shares $17.67 million +8.9%N/A0 $21.90 9/30/2024741,400 shares $16.24 million -3.2%N/A0 $21.90 9/15/2024765,700 shares $16.77 million -2.8%N/A7657 $21.90 8/31/2024788,000 shares $20.72 million -4.4%N/A0 $26.30 8/15/2024824,100 shares $21.67 million -31.1%N/A0 $26.30 7/31/20241,195,600 shares $31.44 million -5.4%N/A0 $26.30 7/15/20241,263,600 shares $33.23 million +29.5%N/A0 $26.30 6/30/2024975,900 shares $25.67 million +0.4%N/A0 $26.30 6/15/2024972,100 shares $25.57 million -7.7%N/A0 $26.30 5/31/20241,053,200 shares $27.70 million +4.6%N/A0 $26.30 5/15/20241,007,100 shares $28.80 million -2.5%N/A0 $28.60 4/30/20241,032,900 shares $28.71 million +0.4%N/A0 $27.80 4/15/20241,029,000 shares $28.61 million +0.6%N/A0 $27.80 3/31/20241,023,000 shares $28.44 million +3.2%N/A0 $27.80 3/15/2024990,900 shares $27.55 million +5.0%N/A3303 $27.80 2/29/2024943,600 shares $26.23 million -5.7%N/A0 $27.80 2/15/20241,000,700 shares $27.82 million -2.9%N/A0 $27.80 1/15/20241,056,000 shares $29.36 million -5.9%N/A0 $27.80 12/31/20231,122,000 shares $33.10 million -4.0%N/A86310.3 $29.50 12/15/20231,168,200 shares $39.43 million +7.0%N/A0 $33.75 11/30/20231,091,400 shares $36.83 million +4.0%N/A0 $33.75 11/15/20231,049,300 shares $35.41 million +4.4%N/A0 $33.75 10/31/20231,004,700 shares $33.91 million +9.4%N/A0 $33.75 10/15/2023918,800 shares $31.01 million +8.8%N/A0 $33.75 9/30/2023844,600 shares $28.51 million -8.7%N/A0 $33.75 9/15/2023924,600 shares $31.21 million +0.5%N/A0 $33.75 8/31/2023919,700 shares $31.04 million +5.6%N/A0 $33.75 8/15/2023870,600 shares $29.38 million +10.4%N/A0 $33.75 7/31/2023788,400 shares $26.61 million No ChangeN/A0 $33.75 7/15/2023788,400 shares $26.61 million -1.7%N/A0 $33.75 6/30/2023801,600 shares $27.05 million -3.3%N/A8016 $33.75 6/15/2023828,700 shares $28.08 million -12.7%N/A8287 $33.88 5/31/2023948,700 shares $34.49 million -14.0%N/A0 $36.35 5/15/20231,103,400 shares $40.11 million +1.8%N/A0 $36.35 4/30/20231,084,400 shares $39.42 million -2.2%N/A0 $36.35 4/15/20231,109,300 shares $40.32 million -1.1%N/A0 $36.35 3/31/20231,121,200 shares $40.76 million +1.0%N/A0 $36.35 3/15/20231,110,000 shares $40.35 million -2.1%N/A0 $36.35 2/28/20231,133,800 shares $47.62 million +9.3%N/A0 $42.00 2/15/20231,037,500 shares $43.58 million -15.5%N/A0 $42.00 1/31/20231,227,700 shares $0.00 +3.5%N/A0 $0.00 HSYDF Short Interest - Frequently Asked Questions What is Harmonic Drive Systems' current short interest? Short interest is the volume of Harmonic Drive Systems shares that have been sold short but have not yet been covered or closed out. As of September 30th, investors have sold 444,400 shares of HSYDF short. Learn More on Harmonic Drive Systems' current short interest. What is a good short interest ratio for Harmonic Drive Systems? 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. HSYDF shares currently have a short interest ratio of 1,111.0. Learn More on Harmonic Drive Systems's short interest ratio. Is Harmonic Drive Systems' short interest increasing or decreasing? Harmonic Drive Systems saw a increase in short interest during the month of September. As of September 30th, there was short interest totaling 444,400 shares, an increase of 69.2% from the previous total of 262,600 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. Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: AppLovin Corporation ($15.71 billion), Robinhood Markets, Inc. ($7.56 billion), Reddit Inc. ($4.55 billion), Coinbase Global, Inc. ($4.53 billion), CoreWeave Inc. ($4.43 billion), Charter Communications, Inc. ($4.07 billion), Seagate Technology Holdings PLC ($3.94 billion), IonQ, Inc. ($3.78 billion), TC Energy Corporation ($3.13 billion), and Live Nation Entertainment, Inc. ($3.12 billion). View all of the most shorted stocks. What does it mean to sell short Harmonic Drive Systems stock? Short selling HSYDF is an investing strategy that aims to generate trading profit from Harmonic Drive Systems as its price is falling. HSYDF shares are trading up $0.41 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 Harmonic Drive Systems? A short squeeze for Harmonic Drive Systems 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 HSYDF, which in turn drives the price of the stock up even further. How often is Harmonic Drive Systems' 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 HSYDF, twice per month. The most recent reporting period available is September, 30 2025. 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