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Old Second Bancorp Inc

OSBC
Exchange
Nasdaq
Industry
State Commercial Banks
SEC CIK
0000357173

In the last 90 days, Old Second Bancorp Inc insiders filed 1 open-market purchase and 5 sales; 184 institutions reported holding it in 13F filings for Q2 2026, worth $903.3M 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
3.19M
Shares, settlement Oct 30, 2026
Change
+150.4K
+5.0% vs. Oct 15, 2026
Days to cover
5.19
Short interest ÷ average daily volume
Average daily volume
615.0K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 246,964 sharesNov 15, 2024: 319,458 sharesNov 29, 2024: 332,694 sharesDec 13, 2024: 532,777 sharesDec 31, 2024: 567,078 sharesJan 15, 2025: 515,700 sharesJan 31, 2025: 304,809 sharesFeb 14, 2025: 295,618 sharesFeb 28, 2025: 404,706 sharesMar 14, 2025: 501,410 sharesMar 31, 2025: 611,830 sharesApr 15, 2025: 613,447 sharesApr 30, 2025: 493,989 sharesMay 15, 2025: 808,745 sharesMay 30, 2025: 463,273 sharesJun 13, 2025: 486,198 sharesJun 30, 2025: 421,799 sharesJul 15, 2025: 391,161 sharesJul 31, 2025: 422,257 sharesAug 15, 2025: 401,799 sharesAug 29, 2025: 404,870 sharesSep 15, 2025: 474,858 sharesSep 30, 2025: 1,007,988 sharesOct 15, 2025: 1,050,824 sharesOct 31, 2025: 1,144,967 sharesNov 14, 2025: 1,234,153 sharesNov 28, 2025: 1,154,177 sharesDec 15, 2025: 972,940 sharesDec 31, 2025: 948,028 sharesJan 15, 2026: 1,115,152 sharesJan 30, 2026: 1,134,585 sharesFeb 13, 2026: 1,461,147 sharesFeb 27, 2026: 1,124,152 sharesMar 13, 2026: 1,573,727 sharesMar 31, 2026: 1,746,879 sharesApr 15, 2026: 1,421,624 sharesApr 30, 2026: 1,771,562 sharesMay 15, 2026: 1,696,205 sharesMay 29, 2026: 1,712,898 sharesJun 15, 2026: 1,734,571 sharesJun 30, 2026: 1,969,834 sharesJul 15, 2026: 1,729,893 sharesJul 31, 2026: 1,706,682 sharesAug 14, 2026: 1,828,676 sharesAug 31, 2026: 2,002,571 sharesSep 15, 2026: 2,469,231 sharesSep 30, 2026: 2,745,379 sharesOct 15, 2026: 3,040,735 sharesOct 30, 2026: 3,191,124 shares
Short interest in OSBC by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20263.19M+150.4K+5.0%615.0K5.19
Oct 15, 20263.04M+295.4K+10.8%633.7K4.80
Sep 30, 20262.75M+276.1K+11.2%512.7K5.36
Sep 15, 20262.47M+466.7K+23.3%435.6K5.67
Aug 31, 20262.00M+173.9K+9.5%360.8K5.55
Aug 14, 20261.83M+122.0K+7.2%421.5K4.34
Jul 31, 20261.71M−23.2K−1.3%503.0K3.39
Jul 15, 20261.73M−239.9K−12.2%342.8K5.05
Jun 30, 20261.97M+235.3K+13.6%491.8K4.00
Jun 15, 20261.73M+21.7K+1.3%297.4K5.83
May 29, 20261.71M+16.7K+1.0%341.3K5.02
May 15, 20261.70M−75.4K−4.3%370.0K4.58
Apr 30, 20261.77M+349.9K+24.6%491.8K3.60
Apr 15, 20261.42M−325.3K−18.6%397.3K3.58
Mar 31, 20261.75M+173.2K+11.0%402.7K4.34
Mar 13, 20261.57M+449.6K+40.0%406.2K3.87
Feb 27, 20261.12M−337.0K−23.1%298.3K3.77
Feb 13, 20261.46M+326.6K+28.8%323.9K4.51
Jan 30, 20261.13M+19.4K+1.7%423.4K2.68
Jan 15, 20261.12M+167.1K+17.6%331.4K3.36
Dec 31, 2025948.0K−24.9K−2.6%248.2K3.82
Dec 15, 2025972.9K−181.2K−15.7%295.4K3.29
Nov 28, 20251.15M−80.0K−6.5%256.7K4.50
Nov 14, 20251.23M+89.2K+7.8%326.8K3.78
Oct 31, 20251.14M+94.1K+9.0%485.7K2.36
Oct 15, 20251.05M+42.8K+4.3%302.1K3.48
Sep 30, 20251.01M+533.1K+112.3%422.8K2.38
Sep 15, 2025474.9K+70.0K+17.3%223.8K2.12
Aug 29, 2025404.9K+3.07K+0.8%176.3K2.30
Aug 15, 2025401.8K−20.5K−4.8%173.6K2.31
Jul 31, 2025422.3K+31.1K+8.0%239.3K1.76
Jul 15, 2025391.2K−30.6K−7.3%252.1K1.55
Jun 30, 2025421.8K−64.4K−13.3%238.6K1.77
Jun 13, 2025486.2K+22.9K+5.0%172.9K2.81
May 30, 2025463.3K−345.5K−42.7%202.4K2.29
May 15, 2025808.7K+314.8K+63.7%219.0K3.69
Apr 30, 2025494.0K−119.5K−19.5%219.0K2.26
Apr 15, 2025613.4K+1.62K+0.3%257.6K2.38
Mar 31, 2025611.8K+110.4K+22.0%226.2K2.70
Mar 14, 2025501.4K+96.7K+23.9%200.9K2.50
Feb 28, 2025404.7K+109.1K+36.9%249.1K1.62
Feb 14, 2025295.6K−9.19K−3.0%186.2K1.59
Jan 31, 2025304.8K−210.9K−40.9%277.0K1.10
Jan 15, 2025515.7K−51.4K−9.1%244.7K2.11
Dec 31, 2024567.1K+34.3K+6.4%271.7K2.09
Dec 13, 2024532.8K+200.1K+60.1%206.5K2.58
Nov 29, 2024332.7K+13.2K+4.1%203.7K1.63
Nov 15, 2024319.5K+72.5K+29.4%343.3K1.00
Oct 31, 2024247.0K−319.4K−56.4%316.6K1.00

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 OSBC by settlement date
Settlement dateSharesPriceValue
Oct 9, 202624,252$24.86$602.9K
Sep 11, 202610,359$25.53$264.5K
Sep 8, 202612$25.72$308.64
Sep 4, 2026392$25.68$10.1K
Sep 1, 202618,994$25.08$476.4K
Aug 31, 2026558$25.24$14.1K
Aug 24, 20265,959$25.34$151.0K
Aug 6, 202610,173$25.89$263.4K
Jul 31, 20261,573$25.34$39.9K
Jul 30, 20261,379$25.29$34.9K
Jul 22, 202632,920$23.68$779.5K
Jul 9, 202632,304$22.71$733.6K
Jul 1, 2026201$23.32$4.69K
Jun 24, 20262,612$22.57$59.0K
Jun 10, 2026100$21.94$2.19K
Jun 1, 202688$21.32$1.88K
May 22, 20261,246$21.08$26.3K
May 15, 20261,445$20.71$29.9K
May 1, 20262,332$20.61$48.1K
Apr 29, 20261,342$20.91$28.1K
Apr 15, 202611$21.61$237.71
Apr 6, 20262,220$20.74$46.0K
Apr 2, 2026159$20.45$3.25K
Jan 30, 2026406$19.98$8.11K
Jan 16, 202687$20.99$1.83K
Dec 12, 2025444$20.63$9.16K
Dec 10, 202526$19.80$514.8
Oct 23, 20256,473$17.95$116.2K
Oct 15, 2025298$17.97$5.36K
Oct 14, 20254,688$17.24$80.8K

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 OSBC by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 12, 202660,928076,94679.2%
Nov 11, 202667,6000122,71855.1%
Nov 10, 202679,2180213,34137.1%
Nov 9, 202666,55910108,38161.4%
Nov 6, 202684,7400134,63362.9%
Nov 5, 2026116,9500237,54749.2%
Nov 4, 2026146,2980248,25258.9%
Nov 3, 2026163,4160228,52571.5%
Nov 2, 202678,9850222,68535.5%
Oct 30, 202697,0780136,72271.0%
Oct 29, 2026119,4620205,16558.2%
Oct 28, 202692,3780155,71559.3%
Oct 27, 2026101,4360182,18855.7%
Oct 26, 2026135,4860290,88046.6%
Oct 23, 2026110,4420213,17751.8%
Oct 22, 2026106,2970272,44539.0%
Oct 21, 202632,8330111,86529.4%
Oct 20, 202653,2230175,45430.3%
Oct 19, 202650,4630127,49339.6%
Oct 16, 202670,2390203,78434.5%
Oct 15, 202688,5410173,00051.2%
Oct 14, 202690,1740147,78961.0%
Oct 13, 2026114,3620139,89481.7%
Oct 12, 202697,9740143,63668.2%
Oct 9, 202681,639093,59087.2%
Oct 8, 2026126,63084159,35979.5%
Oct 7, 202684,3660111,18375.9%
Oct 6, 2026137,1870213,97364.1%
Oct 5, 202683,81212133,71462.7%
Oct 2, 202689,10278142,82862.4%

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 OSBC
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T2557,59316,485305,2372,98264.6%
Sep 28, 2026T2421,35217,413282,0712,09159.9%
Sep 21, 2026T2474,73116,532258,6322,40064.7%
Sep 14, 2026T2473,89417,962223,5873,06667.9%
Sep 7, 2026T2278,53213,000135,3411,82867.3%
Aug 31, 2026T2441,60614,834171,7552,46572.0%
Aug 24, 2026T2300,99212,56392,7671,78576.4%
Aug 17, 2026T2377,84214,991125,2191,92875.1%
Aug 10, 2026T2310,00116,247307,7551,70650.2%
Aug 3, 2026T2483,49617,743181,8312,36172.7%
Jul 27, 2026T2570,77720,667225,0772,08371.7%
Jul 20, 2026T2570,67418,021211,2202,52773.0%