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Plug Power Inc

PLUG
Exchange
Nasdaq
Industry
Electrical Industrial Apparatus
SEC CIK
0001093691

In the last 90 days, Plug Power Inc insiders filed 0 open-market purchases and 3 sales; 512 institutions reported holding it in 13F filings for Q2 2026, worth $2.20B in total; Coatue Management is the only superinvestor holding 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
281.0M
Shares, settlement Oct 30, 2026
Change
−11.0M
−3.8% vs. Oct 15, 2026
Days to cover
6.19
Short interest ÷ average daily volume
Average daily volume
45.4M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 224,225,675 sharesNov 15, 2024: 216,188,653 sharesNov 29, 2024: 195,294,227 sharesDec 13, 2024: 212,686,488 sharesDec 31, 2024: 204,871,134 sharesJan 15, 2025: 238,461,720 sharesJan 31, 2025: 256,137,870 sharesFeb 14, 2025: 286,404,448 sharesFeb 28, 2025: 282,440,620 sharesMar 14, 2025: 282,337,541 sharesMar 31, 2025: 279,671,714 sharesApr 15, 2025: 263,642,469 sharesApr 30, 2025: 252,653,744 sharesMay 15, 2025: 265,123,224 sharesMay 30, 2025: 225,554,876 sharesJun 13, 2025: 238,128,517 sharesJun 30, 2025: 292,921,816 sharesJul 15, 2025: 297,013,658 sharesJul 31, 2025: 320,167,200 sharesAug 15, 2025: 341,527,861 sharesAug 29, 2025: 349,053,383 sharesSep 15, 2025: 358,842,791 sharesSep 30, 2025: 383,764,248 sharesOct 15, 2025: 331,367,320 sharesOct 31, 2025: 310,624,243 sharesNov 14, 2025: 305,087,014 sharesNov 28, 2025: 336,107,447 sharesDec 15, 2025: 343,021,901 sharesDec 31, 2025: 348,127,252 sharesJan 15, 2026: 340,177,277 sharesJan 30, 2026: 348,414,622 sharesFeb 13, 2026: 346,597,509 sharesFeb 27, 2026: 327,292,724 sharesMar 13, 2026: 329,084,206 sharesMar 31, 2026: 339,721,877 sharesApr 15, 2026: 344,599,730 sharesApr 30, 2026: 343,460,531 sharesMay 15, 2026: 340,711,258 sharesMay 29, 2026: 347,303,584 sharesJun 15, 2026: 339,623,154 sharesJun 30, 2026: 340,731,106 sharesJul 15, 2026: 330,057,977 sharesJul 31, 2026: 294,021,600 sharesAug 14, 2026: 290,919,389 sharesAug 31, 2026: 290,960,720 sharesSep 15, 2026: 287,260,138 sharesSep 30, 2026: 284,616,311 sharesOct 15, 2026: 291,955,349 sharesOct 30, 2026: 280,964,711 shares
Short interest in PLUG by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 2026281.0M−11.0M−3.8%45.4M6.19
Oct 15, 2026292.0M+7.34M+2.6%50.9M5.73
Sep 30, 2026284.6M−2.64M−0.9%48.7M5.84
Sep 15, 2026287.3M−3.70M−1.3%47.2M6.09
Aug 31, 2026291.0M+41.3K0.0%56.1M5.19
Aug 14, 2026290.9M−3.10M−1.1%72.0M4.04
Jul 31, 2026294.0M−36.0M−10.9%49.0M6.00
Jul 15, 2026330.1M−10.7M−3.1%47.8M6.91
Jun 30, 2026340.7M+1.11M+0.3%56.5M6.03
Jun 15, 2026339.6M−7.68M−2.2%58.4M5.82
May 29, 2026347.3M+6.59M+1.9%83.9M4.14
May 15, 2026340.7M−2.75M−0.8%95.9M3.55
Apr 30, 2026343.5M−1.14M−0.3%77.7M4.42
Apr 15, 2026344.6M+4.88M+1.4%71.8M4.80
Mar 31, 2026339.7M+10.6M+3.2%64.6M5.26
Mar 13, 2026329.1M+1.79M+0.6%97.9M3.36
Feb 27, 2026327.3M−19.3M−5.6%81.0M4.04
Feb 13, 2026346.6M−1.82M−0.5%97.2M3.56
Jan 30, 2026348.4M+8.24M+2.4%120.9M2.88
Jan 15, 2026340.2M−7.95M−2.3%95.1M3.58
Dec 31, 2025348.1M+5.11M+1.5%84.9M4.10
Dec 15, 2025343.0M+6.91M+2.1%101.4M3.38
Nov 28, 2025336.1M+31.0M+10.2%111.6M3.01
Nov 14, 2025305.1M−5.54M−1.8%121.2M2.52
Oct 31, 2025310.6M−20.7M−6.3%104.9M2.96
Oct 15, 2025331.4M−52.4M−13.7%224.8M1.47
Sep 30, 2025383.8M+24.9M+6.9%152.4M2.52
Sep 15, 2025358.8M+9.79M+2.8%38.7M9.26
Aug 29, 2025349.1M+7.53M+2.2%39.5M8.83
Aug 15, 2025341.5M+21.4M+6.7%46.1M7.40
Jul 31, 2025320.2M+23.2M+7.8%73.4M4.36
Jul 15, 2025297.0M+4.09M+1.4%86.2M3.44
Jun 30, 2025292.9M+54.8M+23.0%87.4M3.35
Jun 13, 2025238.1M+12.6M+5.6%131.8M1.81
May 30, 2025225.6M−39.6M−14.9%176.0M1.28
May 15, 2025265.1M+12.5M+4.9%138.4M1.92
Apr 30, 2025252.7M−11.0M−4.2%128.7M1.96
Apr 15, 2025263.6M−16.0M−5.7%49.4M5.33
Mar 31, 2025279.7M−2.67M−0.9%58.3M4.79
Mar 14, 2025282.3M−103.1K0.0%68.8M4.10
Feb 28, 2025282.4M−3.96M−1.4%56.9M4.96
Feb 14, 2025286.4M+30.3M+11.8%53.9M5.31
Jan 31, 2025256.1M+17.7M+7.4%76.3M3.36
Jan 15, 2025238.5M+33.6M+16.4%81.2M2.94
Dec 31, 2024204.9M−7.82M−3.7%49.3M4.16
Dec 13, 2024212.7M+17.4M+8.9%77.4M2.75
Nov 29, 2024195.3M−20.9M−9.7%57.4M3.40
Nov 15, 2024216.2M−8.04M−3.6%74.6M2.90
Oct 31, 2024224.2M−19.6M−8.0%42.4M5.28

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 PLUG by settlement date
Settlement dateSharesPriceValue
Oct 14, 20261,269$1.56$1.98K
Oct 13, 2026742,501$1.62$1.20M
Oct 9, 202617,805$1.73$30.8K
Oct 8, 20262,331$1.78$4.15K
Oct 7, 20265,435$1.86$10.1K
Oct 6, 202622,564$1.89$42.6K
Oct 2, 2026956$1.89$1.81K
Oct 1, 202665,209$1.94$126.5K
Sep 30, 20263,447$1.91$6.58K
Sep 29, 2026930$1.86$1.73K
Sep 28, 2026612,309$1.98$1.21M
Sep 25, 2026123,690$1.96$242.4K
Sep 24, 2026426,989$2.04$871.1K
Sep 23, 202648,957$2.11$103.3K
Sep 22, 202656,672$2.09$118.4K
Sep 21, 202697,308$2.09$203.4K
Sep 18, 20261,328,346$2.12$2.82M
Sep 17, 202645,221$2.02$91.3K
Sep 16, 2026163,487$2.05$335.1K
Sep 11, 2026228,568$2.11$482.3K
Sep 10, 2026192,938$2.17$418.7K
Sep 9, 20261,049,682$2.26$2.37M
Sep 8, 2026604,215$2.17$1.31M
Sep 4, 202616,934$2.11$35.7K
Sep 2, 20264,130$2.09$8.63K
Sep 1, 202618,800$2.16$40.6K
Aug 31, 2026229,141$2.19$501.8K
Aug 28, 20261,513,150$2.27$3.43M
Aug 27, 20261,210$2.17$2.63K
Aug 26, 202632,145$2.27$73.0K

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 PLUG by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 13, 202617,928,1332,527,76629,507,96960.8%
Nov 12, 202610,788,2871,713,05520,466,52752.7%
Nov 11, 20268,871,6311,258,37814,947,54159.4%
Nov 10, 202620,771,0862,027,99231,493,65966.0%
Nov 9, 202629,514,66052,03348,448,89460.9%
Nov 6, 202634,262,320168,69459,013,63158.1%
Nov 5, 202636,434,588234,73758,871,13661.9%
Nov 4, 202632,656,087298,38353,162,47361.4%
Nov 3, 202616,099,44633,04327,586,71158.4%
Nov 2, 202617,338,77043,21826,927,18464.4%
Oct 30, 202611,270,61329,76920,152,92355.9%
Oct 29, 202619,246,74184,08132,888,82758.5%
Oct 28, 202617,410,711126,74827,724,17562.8%
Oct 27, 202613,397,43199,32725,097,43553.4%
Oct 26, 202618,500,32673,53128,661,53564.5%
Oct 23, 20269,588,65424,94616,414,26958.4%
Oct 22, 202615,260,93047,77425,629,87059.5%
Oct 21, 202614,657,84934,74824,271,45860.4%
Oct 20, 202615,015,35638,56328,855,63252.0%
Oct 19, 202612,885,29363,19923,873,16154.0%
Oct 16, 202615,874,17056,54729,160,70254.4%
Oct 15, 202619,447,20670,43734,440,81956.5%
Oct 14, 202622,795,819265,26048,362,97147.1%
Oct 13, 202615,787,088112,92428,704,61255.0%
Oct 12, 202613,760,24544,46026,999,51651.0%
Oct 9, 202613,793,31011,56227,749,26549.7%
Oct 8, 202615,978,26669,98127,705,12157.7%
Oct 7, 202615,890,74268,63026,216,74560.6%
Oct 6, 202615,154,87844,70426,932,15556.3%
Oct 5, 202614,832,83781,36923,125,18864.1%

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 PLUG
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T222,491,59086,490117,754,222267,68016.0%
Sep 28, 2026T221,918,74885,059129,041,845320,02614.5%
Sep 21, 2026T218,882,17566,727114,913,800312,20314.1%
Sep 14, 2026T219,154,88376,607142,175,409314,81211.9%
Sep 7, 2026T213,268,85864,539115,670,159240,81710.3%
Aug 31, 2026T216,541,47965,779118,300,359249,16212.3%
Aug 24, 2026T221,125,31469,086198,289,924312,3399.6%
Aug 17, 2026T218,571,78569,004148,307,500200,58311.1%
Aug 10, 2026T242,371,441101,026206,313,454308,77517.0%
Aug 3, 2026T222,287,28073,10297,665,544243,15818.6%
Jul 27, 2026T234,714,39692,666115,895,496277,59623.0%
Jul 20, 2026T215,786,38865,31677,018,243235,28217.0%