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First Interstate Bancsystem Inc

FIBK
Exchange
Nasdaq
Industry
State Commercial Banks
SEC CIK
0000860413

In the last 90 days, First Interstate Bancsystem Inc insiders filed 0 open-market purchases and 7 sales; 299 institutions reported holding it in 13F filings for Q2 2026, worth $3.52B 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
8.78M
Shares, settlement Oct 30, 2026
Change
+61.9K
+0.7% vs. Oct 15, 2026
Days to cover
7.49
Short interest ÷ average daily volume
Average daily volume
1.17M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 2,135,464 sharesNov 15, 2024: 2,295,609 sharesNov 29, 2024: 2,305,331 sharesDec 13, 2024: 2,333,092 sharesDec 31, 2024: 2,505,832 sharesJan 15, 2025: 2,647,268 sharesJan 31, 2025: 2,700,569 sharesFeb 14, 2025: 2,361,651 sharesFeb 28, 2025: 2,441,587 sharesMar 14, 2025: 2,723,492 sharesMar 31, 2025: 3,160,906 sharesApr 15, 2025: 2,989,016 sharesApr 30, 2025: 3,001,721 sharesMay 15, 2025: 2,867,664 sharesMay 30, 2025: 3,546,260 sharesJun 13, 2025: 4,019,856 sharesJun 30, 2025: 4,049,750 sharesJul 15, 2025: 3,587,571 sharesJul 31, 2025: 2,909,487 sharesAug 15, 2025: 3,018,839 sharesAug 29, 2025: 3,204,392 sharesSep 15, 2025: 4,688,064 sharesSep 30, 2025: 5,250,751 sharesOct 15, 2025: 4,934,413 sharesOct 31, 2025: 4,804,782 sharesNov 14, 2025: 5,005,177 sharesNov 28, 2025: 5,153,664 sharesDec 15, 2025: 8,147,898 sharesDec 31, 2025: 6,710,941 sharesJan 15, 2026: 6,631,852 sharesJan 30, 2026: 6,039,514 sharesFeb 13, 2026: 6,859,194 sharesFeb 27, 2026: 7,703,135 sharesMar 13, 2026: 7,593,272 sharesMar 31, 2026: 8,597,748 sharesApr 15, 2026: 9,123,128 sharesApr 30, 2026: 10,898,439 sharesMay 15, 2026: 9,098,887 sharesMay 29, 2026: 8,673,318 sharesJun 15, 2026: 8,294,118 sharesJun 30, 2026: 9,237,536 sharesJul 15, 2026: 9,218,865 sharesJul 31, 2026: 8,983,565 sharesAug 14, 2026: 8,897,125 sharesAug 31, 2026: 9,519,141 sharesSep 15, 2026: 9,884,438 sharesSep 30, 2026: 8,633,375 sharesOct 15, 2026: 8,716,847 sharesOct 30, 2026: 8,778,743 shares
Short interest in FIBK by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20268.78M+61.9K+0.7%1.17M7.49
Oct 15, 20268.72M+83.5K+1.0%1.12M7.80
Sep 30, 20268.63M−1.25M−12.7%1.50M5.77
Sep 15, 20269.88M+365.3K+3.8%958.0K10.32
Aug 31, 20269.52M+622.0K+7.0%822.6K11.57
Aug 14, 20268.90M−86.4K−1.0%1.01M8.79
Jul 31, 20268.98M−235.3K−2.6%1.42M6.32
Jul 15, 20269.22M−18.7K−0.2%976.6K9.44
Jun 30, 20269.24M+943.4K+11.4%1.25M7.42
Jun 15, 20268.29M−379.2K−4.4%838.7K9.89
May 29, 20268.67M−425.6K−4.7%1.07M8.09
May 15, 20269.10M−1.80M−16.5%1.37M6.66
Apr 30, 202610.9M+1.78M+19.5%1.34M8.13
Apr 15, 20269.12M+525.4K+6.1%1.26M7.24
Mar 31, 20268.60M+1.00M+13.2%1.33M6.47
Mar 13, 20267.59M−109.9K−1.4%1.15M6.58
Feb 27, 20267.70M+843.9K+12.3%819.4K9.40
Feb 13, 20266.86M+819.7K+13.6%1.12M6.15
Jan 30, 20266.04M−592.3K−8.9%1.16M5.21
Jan 15, 20266.63M−79.1K−1.2%1.07M6.22
Dec 31, 20256.71M−1.44M−17.6%1.04M6.44
Dec 15, 20258.15M+2.99M+58.1%2.67M3.05
Nov 28, 20255.15M+148.5K+3.0%1.45M3.57
Nov 14, 20255.01M+200.4K+4.2%794.2K6.30
Oct 31, 20254.80M−129.6K−2.6%953.4K5.04
Oct 15, 20254.93M−316.3K−6.0%761.0K6.48
Sep 30, 20255.25M+562.7K+12.0%1.12M4.69
Sep 15, 20254.69M+1.48M+46.3%900.4K5.21
Aug 29, 20253.20M+185.6K+6.2%638.8K5.02
Aug 15, 20253.02M+109.4K+3.8%913.4K3.31
Jul 31, 20252.91M−678.1K−18.9%791.3K3.68
Jul 15, 20253.59M−462.2K−11.4%751.5K4.77
Jun 30, 20254.05M+29.9K+0.7%1.34M3.03
Jun 13, 20254.02M+473.6K+13.4%861.6K4.67
May 30, 20253.55M+678.6K+23.7%867.3K4.09
May 15, 20252.87M−134.1K−4.5%937.6K3.06
Apr 30, 20253.00M+12.7K+0.4%930.7K3.23
Apr 15, 20252.99M−171.9K−5.4%1.20M2.49
Mar 31, 20253.16M+437.4K+16.1%716.1K4.41
Mar 14, 20252.72M+281.9K+11.6%704.3K3.87
Feb 28, 20252.44M+79.9K+3.4%495.6K4.93
Feb 14, 20252.36M−338.9K−12.6%560.3K4.22
Jan 31, 20252.70M+53.3K+2.0%521.2K5.18
Jan 15, 20252.65M+141.4K+5.6%709.0K3.73
Dec 31, 20242.51M+172.7K+7.4%683.2K3.67
Dec 13, 20242.33M+27.8K+1.2%642.1K3.63
Nov 29, 20242.31M+9.72K+0.4%647.5K3.56
Nov 15, 20242.30M+160.1K+7.5%640.2K3.59
Oct 31, 20242.14M−22.8K−1.1%577.1K3.70

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 FIBK by settlement date
Settlement dateSharesPriceValue
Oct 9, 20262$34.94$69.88
Oct 6, 202635,643$35.62$1.27M
Sep 30, 202679,988$36.00$2.88M
Sep 29, 202616,173$36.33$587.6K
Sep 21, 2026328$37.35$12.3K
Sep 10, 2026198$36.82$7.29K
Sep 3, 20269,296$37.16$345.4K
Aug 31, 202635$37.04$1.30K
Aug 28, 2026258$37.27$9.62K
Aug 19, 20268,404$38.46$323.2K
Aug 14, 202643$38.84$1.67K
Aug 13, 202640,291$38.53$1.55M
Aug 12, 2026983$38.02$37.4K
Aug 11, 20265,001$37.38$186.9K
Aug 10, 202693$37.53$3.49K
Aug 7, 2026864$37.42$32.3K
Aug 6, 2026794$38.07$30.2K
Aug 3, 202623,486$38.02$892.9K
Jul 31, 2026682$38.46$26.2K
Jul 30, 202622$37.75$830.5
Jul 24, 20264,636$38.10$176.6K
Jul 20, 2026983$39.18$38.5K
Jul 9, 2026111$38.25$4.25K
Jul 7, 2026768$39.38$30.2K
Jul 6, 202644$39.15$1.72K
Jul 2, 202644$39.26$1.73K
Jun 30, 20266,957$38.59$268.5K
Jun 26, 2026305$38.44$11.7K
Jun 23, 20263,503$36.71$128.6K
Jun 22, 2026801$36.43$29.2K

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 FIBK by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 12, 2026190,07626235,62980.7%
Nov 11, 2026142,6020174,17781.9%
Nov 10, 2026143,24536195,24373.4%
Nov 9, 2026333,4496390,57285.4%
Nov 6, 2026131,51019185,78970.8%
Nov 5, 2026305,841162378,85480.7%
Nov 4, 2026406,5571534,63076.0%
Nov 3, 2026181,8220273,34966.5%
Nov 2, 2026161,9994322,46450.2%
Oct 30, 2026160,8620205,73178.2%
Oct 29, 2026199,43022268,39074.3%
Oct 28, 2026320,0904453,72470.5%
Oct 27, 2026301,3071,091403,23574.7%
Oct 26, 2026244,601205384,42663.6%
Oct 23, 2026353,984577479,86973.8%
Oct 22, 2026509,9660657,89377.5%
Oct 21, 2026174,359109251,17869.4%
Oct 20, 2026154,397744238,34964.8%
Oct 19, 2026144,53997222,64464.9%
Oct 16, 2026136,388540190,05371.8%
Oct 15, 2026131,6010231,61656.8%
Oct 14, 2026199,13271281,18370.8%
Oct 13, 2026133,2427205,47164.8%
Oct 12, 202697,76744180,00154.3%
Oct 9, 2026104,6651,360193,10354.2%
Oct 8, 2026191,2053,234292,79365.3%
Oct 7, 2026139,688942208,80266.9%
Oct 6, 2026226,6131331,65768.3%
Oct 5, 2026210,6100666,51831.6%
Oct 2, 2026106,272907230,45146.1%

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 FIBK
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T21,291,90635,100526,9466,30571.0%
Sep 28, 2026T21,447,42230,209511,5957,37773.9%
Sep 21, 2026T21,224,06534,380804,8177,45760.3%
Sep 14, 2026T21,591,13844,490877,5035,53964.5%
Sep 7, 2026T2779,63628,701732,1234,31051.6%
Aug 31, 2026T2816,38926,703945,5115,54946.3%
Aug 24, 2026T2933,15926,842362,8925,23772.0%
Aug 17, 2026T21,046,52233,025263,3615,54679.9%
Aug 10, 2026T21,061,50931,962462,1094,83269.7%
Aug 3, 2026T21,289,56134,736583,2837,14268.9%
Jul 27, 2026T21,994,36646,909489,4126,72280.3%
Jul 20, 2026T21,542,52140,101582,6365,21572.6%