Skip to main content
Livermore
Livermore
US stocksTW
ZHEN

Westinghouse Air Brake Technologies Corp

WAB
Exchange
NYSE
Industry
Railroad Equipment
SEC CIK
0000943452

In the last 90 days, Westinghouse Air Brake Technologies Corp insiders filed 0 open-market purchases and 6 sales; 1,201 institutions reported holding it in 13F filings for Q2 2026, worth $42.2B in total; Duquesne Family Office 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
3.75M
Shares, settlement Oct 30, 2026
Change
−16.6K
−0.4% vs. Oct 15, 2026
Days to cover
3.24
Short interest ÷ average daily volume
Average daily volume
1.16M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 2,022,874 sharesNov 15, 2024: 2,279,661 sharesNov 29, 2024: 2,174,838 sharesDec 13, 2024: 2,483,370 sharesDec 31, 2024: 2,405,301 sharesJan 15, 2025: 2,359,850 sharesJan 31, 2025: 2,235,313 sharesFeb 14, 2025: 2,454,713 sharesFeb 28, 2025: 2,225,570 sharesMar 14, 2025: 2,555,414 sharesMar 31, 2025: 1,828,610 sharesApr 15, 2025: 1,900,510 sharesApr 30, 2025: 2,083,429 sharesMay 15, 2025: 2,019,115 sharesMay 30, 2025: 1,572,032 sharesJun 13, 2025: 2,077,474 sharesJun 30, 2025: 1,947,362 sharesJul 15, 2025: 1,871,884 sharesJul 31, 2025: 2,587,696 sharesAug 15, 2025: 2,576,803 sharesAug 29, 2025: 2,733,787 sharesSep 15, 2025: 2,675,972 sharesSep 30, 2025: 2,839,512 sharesOct 15, 2025: 2,502,808 sharesOct 31, 2025: 2,412,782 sharesNov 14, 2025: 2,528,060 sharesNov 28, 2025: 2,137,809 sharesDec 15, 2025: 2,411,534 sharesDec 31, 2025: 2,049,501 sharesJan 15, 2026: 2,118,291 sharesJan 30, 2026: 1,822,895 sharesFeb 13, 2026: 1,789,915 sharesFeb 27, 2026: 2,287,421 sharesMar 13, 2026: 1,852,504 sharesMar 31, 2026: 2,207,643 sharesApr 15, 2026: 2,493,303 sharesApr 30, 2026: 3,002,669 sharesMay 15, 2026: 2,838,275 sharesMay 29, 2026: 2,987,913 sharesJun 15, 2026: 3,026,090 sharesJun 30, 2026: 3,015,317 sharesJul 15, 2026: 3,383,668 sharesJul 31, 2026: 3,836,310 sharesAug 14, 2026: 2,792,145 sharesAug 31, 2026: 3,326,896 sharesSep 15, 2026: 3,634,070 sharesSep 30, 2026: 3,538,216 sharesOct 15, 2026: 3,771,311 sharesOct 30, 2026: 3,754,718 shares
Short interest in WAB by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20263.75M−16.6K−0.4%1.16M3.24
Oct 15, 20263.77M+233.1K+6.6%863.9K4.37
Sep 30, 20263.54M−95.9K−2.6%857.5K4.13
Sep 15, 20263.63M+307.2K+9.2%708.9K5.13
Aug 31, 20263.33M+534.8K+19.2%825.2K4.03
Aug 14, 20262.79M−1.04M−27.2%926.7K3.01
Jul 31, 20263.84M+452.6K+13.4%1.28M3.00
Jul 15, 20263.38M+368.4K+12.2%683.5K4.95
Jun 30, 20263.02M−10.8K−0.4%1.01M2.98
Jun 15, 20263.03M+38.2K+1.3%738.3K4.10
May 29, 20262.99M+149.6K+5.3%975.4K3.06
May 15, 20262.84M−164.4K−5.5%970.7K2.92
Apr 30, 20263.00M+509.4K+20.4%1.03M2.91
Apr 15, 20262.49M+285.7K+12.9%1.25M2.00
Mar 31, 20262.21M+355.1K+19.2%826.4K2.67
Mar 13, 20261.85M−434.9K−19.0%916.5K2.02
Feb 27, 20262.29M+497.5K+27.8%925.8K2.47
Feb 13, 20261.79M−33.0K−1.8%1.11M1.61
Jan 30, 20261.82M−295.4K−14.0%661.6K2.76
Jan 15, 20262.12M+68.8K+3.4%655.3K3.23
Dec 31, 20252.05M−362.0K−15.0%818.6K2.50
Dec 15, 20252.41M+273.7K+12.8%752.8K3.20
Nov 28, 20252.14M−390.3K−15.4%861.9K2.48
Nov 14, 20252.53M+115.3K+4.8%975.3K2.59
Oct 31, 20252.41M−90.0K−3.6%949.7K2.54
Oct 15, 20252.50M−336.7K−11.9%842.9K2.97
Sep 30, 20252.84M+163.5K+6.1%1.21M2.35
Sep 15, 20252.68M−57.8K−2.1%1.08M2.49
Aug 29, 20252.73M+157.0K+6.1%836.8K3.27
Aug 15, 20252.58M−10.9K−0.4%1.26M2.04
Jul 31, 20252.59M+715.8K+38.2%1.53M1.69
Jul 15, 20251.87M−75.5K−3.9%855.4K2.19
Jun 30, 20251.95M−130.1K−6.3%1.09M1.79
Jun 13, 20252.08M+505.4K+32.2%688.8K3.02
May 30, 20251.57M−447.1K−22.1%923.1K1.70
May 15, 20252.02M−64.3K−3.1%780.3K2.59
Apr 30, 20252.08M+182.9K+9.6%1.04M1.99
Apr 15, 20251.90M+71.9K+3.9%1.08M1.75
Mar 31, 20251.83M−726.8K−28.4%1.10M1.66
Mar 14, 20252.56M+329.8K+14.8%1.23M2.08
Feb 28, 20252.23M−229.1K−9.3%1.51M1.47
Feb 14, 20252.45M+219.4K+9.8%1.44M1.70
Jan 31, 20252.24M−124.5K−5.3%792.9K2.82
Jan 15, 20252.36M−45.5K−1.9%1.01M2.33
Dec 31, 20242.41M−78.1K−3.1%1.18M2.04
Dec 13, 20242.48M+308.5K+14.2%1.44M1.73
Nov 29, 20242.17M−104.8K−4.6%726.6K2.99
Nov 15, 20242.28M+256.8K+12.7%862.7K2.64
Oct 31, 20242.02M+180.0K+9.8%1.00M2.01

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 WAB by settlement date
Settlement dateSharesPriceValue
Oct 9, 202643$280.80$12.1K
Sep 4, 20263,724$280.83$1.05M
Aug 28, 2026118$297.28$35.1K
Aug 20, 20261,710$292.23$499.7K
Aug 18, 2026198$300.65$59.5K
Aug 7, 2026624$295.23$184.2K
Jun 29, 202610$269.53$2.70K
Jun 15, 20261,720$265.20$456.1K
Jun 12, 202614,908$262.09$3.91M
Jun 10, 202614$265.77$3.72K
May 27, 20266$261.47$1.57K
May 21, 2026480$259.13$124.4K
May 19, 20266,323$260.17$1.65M
May 18, 20262$263.90$527.8
May 14, 20262$264.78$529.56
May 5, 20262,324$262.22$609.4K
Apr 16, 202621$257.38$5.40K
Apr 15, 20263$268.29$804.87
Apr 13, 20262,609$267.28$697.3K
Apr 9, 2026420$269.66$113.3K
Mar 31, 20262$237.37$474.74
Mar 25, 202617$245.62$4.18K
Mar 24, 202618$241.68$4.35K
Mar 13, 20263,611$240.36$867.9K
Feb 17, 202631$256.06$7.94K
Jan 23, 202628$233.70$6.54K
Nov 17, 2025158$203.92$32.2K
Nov 4, 20259,368$204.92$1.92M
Oct 31, 202562,729$203.14$12.7M
Oct 29, 202511,354$197.99$2.25M

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 WAB by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026283,901298428,16766.3%
Nov 9, 2026254,439101457,09855.7%
Nov 6, 2026205,91015381,25954.0%
Nov 5, 2026180,3800433,36641.6%
Nov 4, 2026216,150128372,31858.1%
Nov 3, 2026126,45487246,50051.3%
Nov 2, 2026156,3980299,73952.2%
Oct 30, 2026123,729270234,54252.8%
Oct 29, 2026115,58917349,14433.1%
Oct 28, 202685,69551333,50825.7%
Oct 27, 202690,7030333,92527.2%
Oct 26, 2026155,303411347,08744.7%
Oct 23, 2026225,758283539,82941.8%
Oct 22, 2026348,847500842,39641.4%
Oct 21, 2026749,8001,0001,265,68459.2%
Oct 20, 2026187,0810459,37340.7%
Oct 19, 2026123,0360264,74946.5%
Oct 16, 2026114,9000266,41343.1%
Oct 15, 2026239,388228444,19553.9%
Oct 14, 2026111,588665337,57833.1%
Oct 13, 2026109,9980302,18536.4%
Oct 12, 2026119,1240236,04250.5%
Oct 9, 2026110,947101269,76741.1%
Oct 8, 2026113,718137282,91740.2%
Oct 7, 2026141,259356323,18743.7%
Oct 6, 2026113,453219265,24842.8%
Oct 5, 2026172,73998392,17344.0%
Oct 2, 2026136,589392410,38033.3%
Oct 1, 2026119,506888361,92533.0%
Sep 30, 2026180,4640288,49762.6%

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 WAB
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 19, 2026T12,648,97061,1381,134,40120,20570.0%
Oct 12, 2026T11,084,85439,616898,62218,87854.7%
Oct 5, 2026T11,151,87344,627528,59319,17168.5%
Sep 28, 2026T11,273,44243,801533,52018,34670.5%
Sep 21, 2026T11,184,24342,153499,09719,95170.4%
Sep 14, 2026T1910,95734,451691,41916,56556.9%
Sep 7, 2026T1719,12433,458361,12613,72266.6%
Aug 31, 2026T1938,51338,807627,13216,46959.9%
Aug 24, 2026T1767,43233,027537,93315,00258.8%
Aug 17, 2026T11,211,98637,873902,96315,73857.3%
Aug 10, 2026T11,282,23633,123725,67913,79063.9%
Aug 3, 2026T1983,05841,0111,531,74014,53139.1%