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Duolingo, Inc.

DUOL
Exchange
Nasdaq
Industry
Services-Prepackaged Software
SEC CIK
0001562088

In the last 90 days, Duolingo, Inc. insiders filed 0 open-market purchases and 11 sales; 439 institutions reported holding it in 13F filings for Q2 2026, worth $4.58B in total; no superinvestor holds it.

Four kinds of short-selling data, each measuring something different:

  • Short interest: shares sold short and not yet bought back, as of a settlement date. FINRA publishes it twice a month, about eight business days after the settlement date.
  • Daily short volume: shares sold short each day in off-exchange trades reported to FINRA. It counts trades, not open positions, and is published the next day.
  • Fails-to-deliver: shares not delivered by the settlement date. The SEC publishes them twice a month, about two weeks late.
  • ATS (dark pool) volume: weekly volume on alternative trading systems and other off-exchange venues. FINRA publishes it two to four weeks after the week.

More in the glossary.

Short interest

Shares sold short and not yet bought back, from FINRA, on every settlement date in the last two years.

Short interest
7.15M
Shares, settlement Oct 30, 2026
Change
+44.6K
+0.6% vs. Oct 15, 2026
Days to cover
8.82
Short interest ÷ average daily volume
Average daily volume
810.8K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 1,759,569 sharesNov 15, 2024: 1,427,864 sharesNov 29, 2024: 1,352,009 sharesDec 13, 2024: 1,224,693 sharesDec 31, 2024: 1,295,113 sharesJan 15, 2025: 1,365,585 sharesJan 31, 2025: 1,443,633 sharesFeb 14, 2025: 1,437,905 sharesFeb 28, 2025: 1,231,178 sharesMar 14, 2025: 1,511,244 sharesMar 31, 2025: 1,633,703 sharesApr 15, 2025: 1,383,198 sharesApr 30, 2025: 1,270,958 sharesMay 15, 2025: 1,186,232 sharesMay 30, 2025: 1,434,085 sharesJun 13, 2025: 1,852,681 sharesJun 30, 2025: 2,296,712 sharesJul 15, 2025: 2,423,692 sharesJul 31, 2025: 2,453,625 sharesAug 15, 2025: 3,022,873 sharesAug 29, 2025: 3,308,303 sharesSep 15, 2025: 3,451,571 sharesSep 30, 2025: 3,768,549 sharesOct 15, 2025: 3,858,476 sharesOct 31, 2025: 4,594,054 sharesNov 14, 2025: 5,364,843 sharesNov 28, 2025: 5,405,604 sharesDec 15, 2025: 4,970,210 sharesDec 31, 2025: 6,441,438 sharesJan 15, 2026: 7,431,337 sharesJan 30, 2026: 6,902,698 sharesFeb 13, 2026: 8,729,424 sharesFeb 27, 2026: 8,601,297 sharesMar 13, 2026: 7,634,055 sharesMar 31, 2026: 7,972,506 sharesApr 15, 2026: 7,833,591 sharesApr 30, 2026: 7,604,206 sharesMay 15, 2026: 7,784,364 sharesMay 29, 2026: 7,615,582 sharesJun 15, 2026: 7,912,936 sharesJun 30, 2026: 7,440,425 sharesJul 15, 2026: 7,494,489 sharesJul 31, 2026: 7,263,743 sharesAug 14, 2026: 7,091,179 sharesAug 31, 2026: 7,573,914 sharesSep 15, 2026: 6,573,989 sharesSep 30, 2026: 7,152,857 sharesOct 15, 2026: 7,103,345 sharesOct 30, 2026: 7,147,962 shares
Short interest in DUOL by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20267.15M+44.6K+0.6%810.8K8.82
Oct 15, 20267.10M−49.5K−0.7%839.1K8.47
Sep 30, 20267.15M+578.9K+8.8%1.06M6.72
Sep 15, 20266.57M−999.9K−13.2%1.32M4.97
Aug 31, 20267.57M+482.7K+6.8%1.06M7.16
Aug 14, 20267.09M−172.6K−2.4%1.57M4.50
Jul 31, 20267.26M−230.7K−3.1%1.00M7.23
Jul 15, 20267.49M+54.1K+0.7%982.8K7.63
Jun 30, 20267.44M−472.5K−6.0%1.64M4.54
Jun 15, 20267.91M+297.4K+3.9%1.58M5.01
May 29, 20267.62M−168.8K−2.2%1.20M6.36
May 15, 20267.78M+180.2K+2.4%2.45M3.17
Apr 30, 20267.60M−229.4K−2.9%1.59M4.77
Apr 15, 20267.83M−138.9K−1.7%1.76M4.44
Mar 31, 20267.97M+338.5K+4.4%1.61M4.94
Mar 13, 20267.63M−967.2K−11.3%2.93M2.60
Feb 27, 20268.60M−128.1K−1.5%4.34M1.98
Feb 13, 20268.73M+1.83M+26.5%3.15M2.77
Jan 30, 20266.90M−528.6K−7.1%2.01M3.43
Jan 15, 20267.43M+989.9K+15.4%2.09M3.55
Dec 31, 20256.44M+1.47M+29.6%1.20M5.35
Dec 15, 20254.97M−435.4K−8.1%1.60M3.10
Nov 28, 20255.41M+40.8K+0.8%1.93M2.79
Nov 14, 20255.36M+770.8K+16.8%3.48M1.54
Oct 31, 20254.59M+735.6K+19.1%1.18M3.89
Oct 15, 20253.86M+89.9K+2.4%1.24M3.11
Sep 30, 20253.77M+317.0K+9.2%1.71M2.21
Sep 15, 20253.45M+143.3K+4.3%2.23M1.55
Aug 29, 20253.31M+285.4K+9.4%1.73M1.91
Aug 15, 20253.02M+569.2K+23.2%2.63M1.15
Jul 31, 20252.45M+29.9K+1.2%952.1K2.58
Jul 15, 20252.42M+127.0K+5.5%832.7K2.91
Jun 30, 20252.30M+444.0K+24.0%1.10M2.10
Jun 13, 20251.85M+418.6K+29.2%789.9K2.35
May 30, 20251.43M+247.9K+20.9%667.9K2.15
May 15, 20251.19M−84.7K−6.7%1.22M1.00
Apr 30, 20251.27M−112.2K−8.1%796.3K1.60
Apr 15, 20251.38M−250.5K−15.3%900.2K1.54
Mar 31, 20251.63M+122.5K+8.1%795.6K2.05
Mar 14, 20251.51M+280.1K+22.8%1.21M1.25
Feb 28, 20251.23M−206.7K−14.4%1.23M1.00
Feb 14, 20251.44M−5.73K−0.4%761.6K1.89
Jan 31, 20251.44M+78.0K+5.7%589.3K2.45
Jan 15, 20251.37M+70.5K+5.4%457.7K2.98
Dec 31, 20241.30M+70.4K+5.8%492.4K2.63
Dec 13, 20241.22M−127.3K−9.4%563.6K2.17
Nov 29, 20241.35M−75.9K−5.3%594.2K2.28
Nov 15, 20241.43M−331.7K−18.9%640.4K2.23
Oct 31, 20241.76M−103.3K−5.6%424.1K4.15

Fails-to-deliver

Shares that weren't delivered by the settlement date, from the SEC, for the last 30 dates with fails. The price is the previous day's closing price published by the SEC.

Fails-to-deliver in DUOL by settlement date
Settlement dateSharesPriceValue
Oct 14, 2026714$140.10$100.0K
Oct 7, 202612,834$148.13$1.90M
Oct 2, 2026245$146.57$35.9K
Sep 24, 202678$145.98$11.4K
Sep 22, 202669$149.42$10.3K
Sep 21, 2026100$141.90$14.2K
Sep 17, 20261,795$148.17$266.0K
Sep 8, 2026200$154.46$30.9K
Sep 4, 202623,617$158.82$3.75M
Aug 31, 2026359$146.98$52.8K
Aug 24, 20261,184$146.13$173.0K
Aug 21, 202678$147.03$11.5K
Aug 14, 20261,315$144.10$189.5K
Aug 10, 2026832$130.90$108.9K
Aug 4, 202618,225$135.80$2.47M
Aug 3, 202657,173$134.81$7.71M
Jul 30, 20261,295$140.17$181.5K
Jul 28, 2026784$132.82$104.1K
Jul 22, 202665$124.71$8.11K
Jul 20, 20261,500$133.85$200.8K
Jul 10, 202649,366$129.95$6.42M
Jul 8, 2026219$131.95$28.9K
Jul 7, 20261,694$129.72$219.7K
Jun 29, 20262,619$121.49$318.2K
Jun 26, 2026291$119.94$34.9K
Jun 22, 202622,091$125.56$2.77M
Jun 15, 20261,316$122.63$161.4K
Jun 8, 2026257$109.03$28.0K
Jun 5, 20263$109.15$327.45
May 28, 2026297$107.82$32.0K

Daily short volume

Off-exchange short-sale volume, not short interest: shares sold short each day in trades reported to FINRA, for the last 30 trading days.

The short volume ratio isn't a sentiment gauge: market makers sell short to fill buy orders and to hedge, so short sales are usually about half of off-exchange volume.

Off-exchange short volume in DUOL by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026217,74538369,52558.9%
Nov 9, 2026391,54329671,88258.3%
Nov 6, 2026316,7830566,31955.9%
Nov 5, 2026588,4349831,040,39056.6%
Nov 4, 20262,040,2172,5403,971,10051.4%
Nov 3, 2026520,353346876,06559.4%
Nov 2, 2026334,5706,346538,30062.2%
Oct 30, 2026146,77985299,96148.9%
Oct 29, 2026108,26146210,05951.5%
Oct 28, 2026179,825221388,57546.3%
Oct 27, 2026156,18410270,48257.7%
Oct 26, 2026235,42731385,85961.0%
Oct 23, 2026127,824272272,01847.0%
Oct 22, 2026268,6420413,47265.0%
Oct 21, 2026173,464118241,41471.9%
Oct 20, 202685,6661,116199,40743.0%
Oct 19, 2026133,1290263,96850.4%
Oct 16, 2026195,812103342,66757.1%
Oct 15, 2026314,8342,892607,24851.8%
Oct 14, 2026239,6848360,90466.4%
Oct 13, 2026210,9432,391287,60973.3%
Oct 12, 2026172,32574285,37960.4%
Oct 9, 2026160,48118247,26764.9%
Oct 8, 2026188,15076290,34564.8%
Oct 7, 2026192,291100302,45163.6%
Oct 6, 2026149,454130256,72258.2%
Oct 5, 2026148,26732298,00649.8%
Oct 2, 2026198,2880288,12268.8%
Oct 1, 2026177,55532289,63561.3%
Sep 30, 2026169,998301360,09247.2%

ATS (dark pool) volume

Weekly volume on alternative trading systems (ATS) and other off-exchange (OTC) venues, from FINRA, for the last 12 weeks. ATS share is ATS volume ÷ (ATS + OTC volume), not a share of all trading.

Weekly ATS and OTC volume in DUOL
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 19, 2026T11,110,77237,882473,40513,74370.1%
Oct 12, 2026T11,379,36240,211922,25015,48759.9%
Oct 5, 2026T11,015,64934,911613,90115,68362.3%
Sep 28, 2026T11,783,20353,812625,38718,04874.0%
Sep 21, 2026T11,541,56547,918657,91217,18870.1%
Sep 14, 2026T11,423,67644,6981,203,19517,63554.2%
Sep 7, 2026T11,814,48546,691626,47418,21474.3%
Aug 31, 2026T12,013,31761,7391,105,84731,13364.5%
Aug 24, 2026T11,236,93344,387530,26815,89570.0%
Aug 17, 2026T12,229,06866,028991,03027,74469.2%
Aug 10, 2026T11,693,90854,015935,43622,35164.4%
Aug 3, 2026T12,862,74270,8381,278,32832,78869.1%