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CISS short interest Nasdaq Capital Market

C3is Inc. Common Stock. FINRA's reported shares short for this symbol, twice a month by settlement date, shown as the regulator publishes them. No percentage is shown: an SEC filer exists but no defensible share count is available yet.

Shares short
20,750
vs previous settlement
−72,658 (-77.8%)
days to cover
1.00
Settlement date
15 Sep 2026

Shares short over time

Aggregate net short position time series for CISS shares short

Days to cover

FINRA's own figure: reported shares short divided by the security's average daily trading volume, published alongside each settlement.

Aggregate net short position time series for CISS days to cover

Fails to deliver

The SEC's fails-to-deliver figure for CISS: the aggregate net balance of shares that failed to be delivered at each settlement date, published by the SEC twice a month and shown here verbatim for the trailing window. A balance is not a daily flow, and a fail has many ordinary causes; the SEC says it cannot guarantee the accuracy of the data. See what fails to deliver are and the largest balances today.

Last balance on file
8,821
11 Sep 2026
Highest in window
11,792,191
31 Jul 2026
Days with a balance
131
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for C3is Inc. Common Stock fails to deliver

Source: U.S. Securities and Exchange Commission, fails-to-deliver data (public domain). Only settlement days with a positive balance appear; the largest balance in the window was 12M shares.

History

Every FINRA settlement we hold for CISS, newest first.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 202620,750−72,6581.00
31 Aug 202693,408−457,6011.00
14 Aug 2026551,009−2,315,5741.00
31 Jul 20262,866,583+2,805,6031.00
15 Jul 202660,980+24,9731.00
30 Jun 202636,007−46,5251.00
15 Jun 202682,532+33,9181.00
29 May 202648,614−55,4391.00
15 May 2026104,053+19,0733.08
30 Apr 202684,980+74,3491.11
15 Apr 202610,631−47,7561.00
31 Mar 202658,387−2,2271.00
13 Mar 202660,614−190,9871.00
27 Feb 2026251,601−20,3581.00
13 Feb 2026271,959+97,6491.00
30 Jan 2026174,310+113,7241.00
15 Jan 202660,586−119,2171.00
31 Dec 2025179,803−247,4221.00
15 Dec 2025427,225+354,3831.00
28 Nov 202572,842−26,5701.81
14 Nov 202599,412−12,8231.05
31 Oct 2025112,235+62,6911.00
15 Oct 202549,544−219,4101.00
30 Sep 2025268,954+80,6621.00
15 Sep 2025188,292+90,6821.52
29 Aug 202597,610−15,6241.00
15 Aug 2025113,234−52,4533.91
31 Jul 2025165,687+26,9944.09
15 Jul 2025138,693−9,1815.92
30 Jun 2025147,874+56,7531.00
13 Jun 202591,121−6,0381.29
30 May 202597,159−17,7247.20
15 May 2025114,883−14,3033.25
30 Apr 2025129,186+23,6224.38
15 Apr 2025105,564−420,5991.15
31 Mar 2025526,163−1,35412.70
14 Mar 2025527,517+5,18610.96
28 Feb 2025522,331−72,4655.14
14 Feb 2025594,796−35,32711.60
31 Jan 2025630,123+105,4153.51
15 Jan 2025524,708−234,6123.04
31 Dec 2024759,320+683,1171.94
13 Dec 202476,203+7,9801.00
29 Nov 202468,223−188,9031.00
15 Nov 2024257,126−203,8891.73
31 Oct 2024461,015−236,5033.97
15 Oct 2024697,518+43,0684.97
30 Sep 2024654,450−74,3615.46
13 Sep 2024728,811−118,0203.39
30 Aug 2024846,831+11,3892.69
15 Aug 2024835,442+63,8374.46
31 Jul 2024771,605−124,0723.49
15 Jul 2024895,677−249,0042.75
28 Jun 20241,144,681−481,3411.75
14 Jun 20241,626,022+183,6071.44
31 May 20241,442,415+816,4921.00
15 May 2024625,923−53,5011.00
30 Apr 2024679,424+475,3981.00
15 Apr 2024204,026−3,122,3221.00
28 Mar 20243,326,348+917,1641.00
15 Mar 20242,409,184+804,4121.00
29 Feb 20241,604,772−655,1791.00
15 Feb 20242,259,951−1,489,1811.00
31 Jan 20243,749,132+3,319,8931.00
12 Jan 2024429,239+261,9541.06
29 Dec 2023167,285−69,4601.00
15 Dec 2023236,745−8,0231.68
30 Nov 2023244,768−12,1081.00
15 Nov 2023256,876+70,4731.00
31 Oct 2023186,403+124,5881.00
13 Oct 202361,815−38,9331.00
29 Sep 2023100,748+26,5711.00
15 Sep 202374,177+70,1401.00
31 Aug 20234,037−32,1211.00
15 Aug 202336,158−15,5291.00
31 Jul 202351,687−158,2471.00
14 Jul 2023209,934−541,9541.00
30 Jun 2023751,888–1.00

Scroll inside the table for earlier settlements, back to 30 Jun 2023.

Questions

Frequently asked questions

What is CISS's short interest?
20,750 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, down 72,658 from the previous settlement.
Why is there no percentage for CISS?
Because no defensible share count exists to divide by: an SEC filer exists but no defensible share count is available yet. The symbol maps to an SEC filer, but its share count cannot be used yet. A newly listed company needs two cover-page counts on file before the first is trusted; a split or an unexplained jump pauses publication until a fresh SEC count corroborates it; a secondary share class publishes under the company's primary line; and a foreign filer's short count is in depositary-share units. This page upgrades to a percentage automatically once a defensible count exists.
What is CISS's days to cover?
1.00 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume, published in the same file and shown verbatim. We hold no volume data ourselves.
Is this the short float?
No. This page shows FINRA's share count only. Short float divides that count by the public float, and short interest as we publish it elsewhere divides it by shares outstanding from SEC filings. Neither denominator is available for this line, so neither ratio is shown.
How often does this update?
FINRA member firms report short positions as of the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. We ingest each file the day it appears and re-read recent settlements for revisions.

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