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Aar Corp

AIR
Exchange
NYSE
Industry
Aircraft & Parts
SEC CIK
0000001750

In the last 90 days, Aar Corp insiders filed 0 open-market purchases and 3 sales; 412 institutions reported holding it in 13F filings for Q2 2026, worth $5.78B 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
2.43M
Shares, settlement Oct 30, 2026
Change
+338.9K
+16.2% vs. Oct 15, 2026
Days to cover
5.03
Short interest ÷ average daily volume
Average daily volume
484.2K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 562,163 sharesNov 15, 2024: 545,123 sharesNov 29, 2024: 549,501 sharesDec 13, 2024: 617,469 sharesDec 31, 2024: 792,170 sharesJan 15, 2025: 834,198 sharesJan 31, 2025: 685,333 sharesFeb 14, 2025: 640,813 sharesFeb 28, 2025: 616,331 sharesMar 14, 2025: 646,192 sharesMar 31, 2025: 894,587 sharesApr 15, 2025: 757,299 sharesApr 30, 2025: 670,248 sharesMay 15, 2025: 720,224 sharesMay 30, 2025: 636,160 sharesJun 13, 2025: 723,817 sharesJun 30, 2025: 829,731 sharesJul 15, 2025: 827,294 sharesJul 31, 2025: 752,988 sharesAug 15, 2025: 794,676 sharesAug 29, 2025: 932,664 sharesSep 15, 2025: 961,540 sharesSep 30, 2025: 1,113,327 sharesOct 15, 2025: 1,133,642 sharesOct 31, 2025: 1,183,910 sharesNov 14, 2025: 1,086,210 sharesNov 28, 2025: 1,132,000 sharesDec 15, 2025: 1,207,541 sharesDec 31, 2025: 1,194,711 sharesJan 15, 2026: 1,390,906 sharesJan 30, 2026: 1,098,280 sharesFeb 13, 2026: 1,261,803 sharesFeb 27, 2026: 1,167,440 sharesMar 13, 2026: 1,163,629 sharesMar 31, 2026: 1,276,980 sharesApr 15, 2026: 1,137,144 sharesApr 30, 2026: 1,167,785 sharesMay 15, 2026: 1,147,695 sharesMay 29, 2026: 1,226,997 sharesJun 15, 2026: 1,263,783 sharesJun 30, 2026: 1,540,714 sharesJul 15, 2026: 1,416,560 sharesJul 31, 2026: 1,321,741 sharesAug 14, 2026: 1,352,216 sharesAug 31, 2026: 1,488,188 sharesSep 15, 2026: 1,599,093 sharesSep 30, 2026: 1,974,283 sharesOct 15, 2026: 2,095,615 sharesOct 30, 2026: 2,434,557 shares
Short interest in AIR by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20262.43M+338.9K+16.2%484.2K5.03
Oct 15, 20262.10M+121.3K+6.2%618.3K3.39
Sep 30, 20261.97M+375.2K+23.5%793.6K2.49
Sep 15, 20261.60M+110.9K+7.5%340.4K4.70
Aug 31, 20261.49M+136.0K+10.1%447.1K3.33
Aug 14, 20261.35M+30.5K+2.3%290.6K4.65
Jul 31, 20261.32M−94.8K−6.7%554.1K2.39
Jul 15, 20261.42M−124.2K−8.1%385.4K3.68
Jun 30, 20261.54M+276.9K+21.9%646.3K2.38
Jun 15, 20261.26M+36.8K+3.0%372.7K3.39
May 29, 20261.23M+79.3K+6.9%341.4K3.59
May 15, 20261.15M−20.1K−1.7%393.4K2.92
Apr 30, 20261.17M+30.6K+2.7%384.7K3.04
Apr 15, 20261.14M−139.8K−11.0%379.0K3.00
Mar 31, 20261.28M+113.4K+9.7%737.5K1.73
Mar 13, 20261.16M−3.81K−0.3%421.9K2.76
Feb 27, 20261.17M−94.4K−7.5%314.7K3.71
Feb 13, 20261.26M+163.5K+14.9%445.2K2.83
Jan 30, 20261.10M−292.6K−21.0%413.8K2.65
Jan 15, 20261.39M+196.2K+16.4%917.5K1.52
Dec 31, 20251.19M−12.8K−1.1%390.3K3.06
Dec 15, 20251.21M+75.5K+6.7%307.3K3.93
Nov 28, 20251.13M+45.8K+4.2%363.8K3.11
Nov 14, 20251.09M−97.7K−8.3%350.4K3.10
Oct 31, 20251.18M+50.3K+4.4%351.5K3.37
Oct 15, 20251.13M+20.3K+1.8%801.8K1.41
Sep 30, 20251.11M+151.8K+15.8%781.4K1.42
Sep 15, 2025961.5K+28.9K+3.1%259.3K3.71
Aug 29, 2025932.7K+138.0K+17.4%266.4K3.50
Aug 15, 2025794.7K+41.7K+5.5%427.0K1.86
Jul 31, 2025753.0K−74.3K−9.0%620.5K1.21
Jul 15, 2025827.3K−2.44K−0.3%344.4K2.40
Jun 30, 2025829.7K+105.9K+14.6%293.5K2.83
Jun 13, 2025723.8K+87.7K+13.8%268.1K2.70
May 30, 2025636.2K−84.1K−11.7%180.6K3.52
May 15, 2025720.2K+50.0K+7.5%227.5K3.17
Apr 30, 2025670.2K−87.1K−11.5%257.4K2.60
Apr 15, 2025757.3K−137.3K−15.4%404.3K1.87
Mar 31, 2025894.6K+248.4K+38.4%438.6K2.04
Mar 14, 2025646.2K+29.9K+4.8%225.0K2.87
Feb 28, 2025616.3K−24.5K−3.8%194.4K3.17
Feb 14, 2025640.8K−44.5K−6.5%153.1K4.18
Jan 31, 2025685.3K−148.9K−17.9%191.9K3.57
Jan 15, 2025834.2K+42.0K+5.3%413.7K2.02
Dec 31, 2024792.2K+174.7K+28.3%259.5K3.05
Dec 13, 2024617.5K+68.0K+12.4%189.1K3.26
Nov 29, 2024549.5K+4.38K+0.8%172.5K3.19
Nov 15, 2024545.1K−17.0K−3.0%277.6K1.96
Oct 31, 2024562.2K−143.7K−20.4%238.5K2.36

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 AIR by settlement date
Settlement dateSharesPriceValue
Oct 9, 202624$101.58$2.44K
Oct 5, 20264,831$102.51$495.2K
Oct 1, 202659$101.47$5.99K
Sep 21, 20265,970$112.77$673.2K
Sep 18, 20262,949$112.12$330.6K
Sep 17, 2026560$117.23$65.6K
Sep 14, 20261,824$125.48$228.9K
Sep 10, 2026238$124.60$29.7K
Sep 8, 202626$126.54$3.29K
Aug 27, 20261$138.58$138.58
Aug 21, 20268,259$132.39$1.09M
Aug 18, 2026201,853$153.71$31.0M
Aug 12, 20261$145.45$145.45
Jul 30, 20264$135.40$541.6
Jul 24, 2026200$129.47$25.9K
Jul 23, 2026218$127.60$27.8K
Jul 22, 2026200$141.40$28.3K
Jul 16, 202619$135.73$2.58K
Jul 15, 2026415$134.46$55.8K
Jul 6, 20264,730$140.11$662.7K
Jun 26, 202630$138.51$4.16K
May 19, 202642$103.79$4.36K
Apr 27, 202695$110.54$10.5K
Apr 17, 20262,891$118.51$342.6K
Apr 15, 2026538$125.99$67.8K
Apr 14, 2026104$123.77$12.9K
Mar 27, 202652,895$110.82$5.86M
Mar 26, 202650$118.52$5.93K
Mar 23, 20267$101.33$709.31
Mar 16, 2026213$101.91$21.7K

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 AIR by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026105,699239135,48278.0%
Nov 9, 2026106,20625187,35956.7%
Nov 6, 202660,30166487,71168.7%
Nov 5, 2026107,78511159,28067.7%
Nov 4, 2026149,1470235,41463.4%
Nov 3, 2026117,5990183,43064.1%
Nov 2, 2026154,8380198,27578.1%
Oct 30, 202682,0860121,55367.5%
Oct 29, 202696,15439156,01861.6%
Oct 28, 2026102,3093,172168,52760.7%
Oct 27, 2026134,2670180,78174.3%
Oct 26, 2026114,6880190,27760.3%
Oct 23, 2026148,4140212,66069.8%
Oct 22, 2026129,2001343,64437.6%
Oct 21, 202686,0740164,06552.5%
Oct 20, 2026114,0690182,62762.5%
Oct 19, 202697,5051,650131,25174.3%
Oct 16, 2026143,0840208,96268.5%
Oct 15, 202680,9030201,38940.2%
Oct 14, 2026136,51515243,70856.0%
Oct 13, 202677,144342139,35955.4%
Oct 12, 202672,3867173,62441.7%
Oct 9, 202675,104713137,03454.8%
Oct 8, 2026136,5800191,30971.4%
Oct 7, 202699,2110172,57457.5%
Oct 6, 2026121,9840217,42156.1%
Oct 5, 2026143,5340272,80052.6%
Oct 2, 2026230,1116487,47847.2%
Oct 1, 2026258,8680383,91567.4%
Sep 30, 2026311,74216,820565,82355.1%

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 AIR
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T2751,86822,127345,9837,94268.5%
Sep 28, 2026T22,154,02945,498778,84812,71073.4%
Sep 21, 2026T2571,94822,121316,3746,55064.4%
Sep 14, 2026T2746,74827,511432,7846,82763.3%
Sep 7, 2026T2324,44716,342264,7434,00255.1%
Aug 31, 2026T2325,82417,003222,5876,22659.4%
Aug 24, 2026T2280,64216,682194,0215,42259.1%
Aug 17, 2026T2789,12421,4261,067,1596,81042.5%
Aug 10, 2026T2287,81415,702134,8184,37068.1%
Aug 3, 2026T2466,81517,776297,1929,63561.1%
Jul 27, 2026T2573,10118,429218,3836,49572.4%
Jul 20, 2026T21,035,38127,645386,15611,33372.8%