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HowShorted

How shorted is Columbia Banking System, Inc.? COLB

#2,158most shorted US stockof 3,805 ranked stocks, more shorted than 43%

3.73%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.04
5 reports (~10 weeks)
+0.76
days to cover
3.52
Aggregate net short position time series for Columbia Banking System, Inc.

Markers along the chart's base: ▲ results announced (an 8-K reporting results was filed) ▲ quarterly or annual report filed. Dates are SEC filing dates; hover a point to see events since the previous settlement.

Days to cover

FINRA's own figure: reported shares short divided by the stock's average daily trading volume, published alongside each settlement. It expresses the short position in days of typical trading rather than as a percentage of the company; the two can move differently.

Aggregate net short position time series for Columbia Banking System, Inc. days to cover

Short interest around results

For each results announcement (an 8-K reporting results, by its SEC filing date), the FINRA settlement before it and the first one after. Settlements fall twice a month, so the two figures can sit up to a month apart and much else changes in between: this shows what was reported, not why.

Reported short interest before and after each results announcement
Results filedSettlement beforeSettlement afterChange
23 Jul 20263.33% 15 Jul 20263.05% 31 Jul 2026−0.28
23 Apr 20263.14% 15 Apr 20263.18% 30 Apr 2026+0.04
22 Jan 20262.73% 15 Jan 20262.95% 30 Jan 2026+0.22
30 Oct 20254.62% 15 Oct 20253.18% 31 Oct 2025−1.44
24 Jul 20254.81% 15 Jul 20254.58% 31 Jul 2025−0.23
23 Apr 20253.57% 15 Apr 20254.02% 30 Apr 2025+0.45
23 Jan 20252.20% 15 Jan 20252.49% 31 Jan 2025+0.29
24 Oct 20241.97% 15 Oct 20241.92% 31 Oct 2024−0.05

Fails to deliver

The SEC's fails-to-deliver figure for COLB: 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
36,362
1 Sep 2026
Highest in window
447,714
14 Oct 2025
Days with a balance
42
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Columbia Banking System, Inc. 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 448K shares.

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Sector: Financials

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20263.73%−0.04
31 Aug 20263.77%+0.30
14 Aug 20263.47%+0.42
31 Jul 20263.05%−0.28
15 Jul 20263.33%+0.36
30 Jun 20262.97%−0.31
15 Jun 20263.28%−0.11
29 May 20263.39%+0.32
15 May 20263.07%−0.11
30 Apr 20263.18%+0.04
15 Apr 20263.14%−0.65
31 Mar 20263.79%−0.38
13 Mar 20264.17%+0.39
27 Feb 20263.78%+0.13
13 Feb 20263.65%+0.70
30 Jan 20262.95%+0.22
15 Jan 20262.73%−0.19
31 Dec 20252.92%−0.13
15 Dec 20253.05%−0.19
28 Nov 20253.24%+0.13
14 Nov 20253.11%−0.07
31 Oct 20253.18%−1.44
15 Oct 20254.62%+0.56
30 Sep 20254.06%+0.93
15 Sep 20253.13%−3.49
29 Aug 20256.62%+0.88
15 Aug 20255.74%+1.16
31 Jul 20254.58%−0.23
15 Jul 20254.81%−0.63
30 Jun 20255.44%+0.36
13 Jun 20255.08%+0.30
30 May 20254.78%+0.21
15 May 20254.57%+0.55
30 Apr 20254.02%+0.45
15 Apr 20253.57%+0.10
31 Mar 20253.47%+0.17
14 Mar 20253.30%−0.15
28 Feb 20253.45%+0.88
14 Feb 20252.57%+0.08
31 Jan 20252.49%+0.29
15 Jan 20252.20%+0.23
31 Dec 20241.97%0.00
13 Dec 20241.97%−0.40
29 Nov 20242.37%+0.43
15 Nov 20241.94%+0.02
31 Oct 20241.92%−0.05
15 Oct 20241.97%−0.46
30 Sep 20242.43%−0.80
13 Sep 20243.23%−0.67
30 Aug 20243.90%−0.17
15 Aug 20244.07%+0.05
31 Jul 20244.02%−0.20
15 Jul 20244.22%−0.01
28 Jun 20244.23%+0.15
14 Jun 20244.08%+0.47
31 May 20243.61%−0.12
15 May 20243.73%−0.37
30 Apr 20244.10%+0.51
15 Apr 20243.59%−0.26
28 Mar 20243.85%+1.27
15 Mar 20242.58%+1.23
29 Feb 20241.35%+0.09
15 Feb 20241.26%−0.29
31 Jan 20241.55%−0.18
12 Jan 20241.73%+0.12
29 Dec 20231.61%−0.62
15 Dec 20232.23%+0.33
30 Nov 20231.90%−0.28
15 Nov 20232.18%+0.07
31 Oct 20232.11%+0.54
13 Oct 20231.57%−0.04
29 Sep 20231.61%−0.28
15 Sep 20231.89%−0.28
31 Aug 20232.17%−0.07
15 Aug 20232.24%−0.37
31 Jul 20232.61%−0.82
14 Jul 20233.43%+0.63
30 Jun 20232.80%+0.14
15 Jun 20232.66%−0.63
31 May 20233.29%+0.33
15 May 20232.96%−4.18
28 Apr 20237.14%−0.11
14 Apr 20237.25%+0.67
31 Mar 20236.58%−8.94
28 Feb 202315.52%+1.34
15 Feb 202314.18%+0.41
31 Jan 202313.77%+0.07
13 Jan 202313.70%−0.54
30 Dec 202214.24%+0.64
15 Dec 202213.60%−0.69
30 Nov 202214.29%+0.23
15 Nov 202214.06%−0.60
31 Oct 202214.66%−0.82
14 Oct 202215.48%+1.03
30 Sep 202214.45%+0.21
15 Sep 202214.24%+0.03
31 Aug 202214.21%−0.13
15 Aug 202214.34%+0.04
29 Jul 202214.30%−0.55
15 Jul 202214.85%+0.67
30 Jun 202214.18%+0.06
15 Jun 202214.12%+0.98
31 May 202213.14%+1.25
13 May 202211.89%+0.70
29 Apr 202211.19%+0.25
14 Apr 202210.94%+0.61
31 Mar 202210.33%+0.30
15 Mar 202210.03%+0.80
28 Feb 20229.23%+0.67
15 Feb 20228.56%+1.32
31 Jan 20227.24%+0.19
14 Jan 20227.05%+0.89
31 Dec 20216.16%+0.88
15 Dec 20215.28%+0.67
30 Nov 20214.61%−0.10
15 Nov 20214.71%−0.45
29 Oct 20215.16%+1.75
15 Oct 20213.41%+0.34
30 Sep 20213.07%+0.71
15 Sep 20212.36%−0.08
31 Aug 20212.44%−0.16
13 Aug 20212.60%−0.15
30 Jul 20212.75%−0.46
15 Jul 20213.21%+0.29
30 Jun 20212.92%+0.55
15 Jun 20212.37%+0.09
28 May 20212.28%+0.02
14 May 20212.26%−0.20
30 Apr 20212.46%+0.04
15 Apr 20212.42%−0.32
31 Mar 20212.74%−0.17
15 Mar 20212.91%−0.24
26 Feb 20213.15%−0.08
12 Feb 20213.23%−0.36
29 Jan 20213.59%+0.14
15 Jan 20213.45%+0.20
31 Dec 20203.25%+0.17
15 Dec 20203.08%+0.62
30 Nov 20202.46%+0.08
13 Nov 20202.38%+0.07
30 Oct 20202.31%+0.07
15 Oct 20202.24%−0.24
30 Sep 20202.48%−0.16
15 Sep 20202.64%−0.19
31 Aug 20202.83%−0.40
14 Aug 20203.23%−0.11
31 Jul 20203.34%+0.13
15 Jul 20203.21%−0.48
30 Jun 20203.69%+0.25
15 Jun 20203.44%−0.15
29 May 20203.59%−0.19
15 May 20203.78%−0.08
30 Apr 20203.86%−0.16
15 Apr 20204.02%−0.46
31 Mar 20204.48%+0.43
13 Mar 20204.05%+1.10
28 Feb 20202.95%−0.53
14 Feb 20203.48%−0.18
31 Jan 20203.66%−0.12
15 Jan 20203.78%−0.02
31 Dec 20193.80%−0.25
13 Dec 20194.05%−0.31
29 Nov 20194.36%−0.12
15 Nov 20194.48%+0.42
31 Oct 20194.06%+0.26
15 Oct 20193.80%−0.09
30 Sep 20193.89%−0.01
13 Sep 20193.90%+0.10
30 Aug 20193.80%−0.05
15 Aug 20193.85%+0.20
31 Jul 20193.65%+0.08
15 Jul 20193.57%−0.20
28 Jun 20193.77%+0.18
14 Jun 20193.59%+0.08
31 May 20193.51%+0.35
15 May 20193.16%+0.17
30 Apr 20192.99%0.00
15 Apr 20192.99%−0.32
29 Mar 20193.31%−0.16
15 Mar 20193.47%−0.01
28 Feb 20193.48%−0.01
15 Feb 20193.49%+0.04
31 Jan 20193.45%+0.14
15 Jan 20193.31%−0.19
31 Dec 20183.50%+0.37
14 Dec 20183.13%+0.09
30 Nov 20183.04%+0.12
15 Nov 20182.92%+0.04
31 Oct 20182.88%−0.04
15 Oct 20182.92%+0.24
28 Sep 20182.68%−0.31
14 Sep 20182.99%+0.53
31 Aug 20182.46%−0.03
15 Aug 20182.49%−0.05
31 Jul 20182.54%−0.55
13 Jul 20183.09%0.00
29 Jun 20183.09%−0.22
15 Jun 20183.31%+0.50
31 May 20182.81%+0.18
15 May 20182.63%+0.16
30 Apr 20182.47%+0.06
13 Apr 20182.41%+0.35
29 Mar 20182.06%+0.22
15 Mar 20181.84%+0.44
28 Feb 20181.40%−0.15
15 Feb 20181.55%−0.58
31 Jan 20182.13%−0.10
12 Jan 20182.23%−0.69
29 Dec 20172.92%–

Newest first. Scroll inside the table for earlier dates, back to 29 Dec 2017.

Frequently asked questions

How shorted is Columbia Banking System, Inc. right now?
3.73% of Columbia Banking System, Inc.'s (COLB) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,158th most shorted US stock, out of 3,805 we rank.
What does this number include?
FINRA member firms must report their short positions in all US equities twice a month; FINRA consolidates them per security. We divide that official share count by the company's shares outstanding from its SEC filings. This is the regulatory figure, not a daily estimate.
Why does it only update twice a month?
US short interest is reported for settlement on the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. That cadence is set by regulation; no daily official figure exists.
Is this COLB's short float?
No. This is short interest as a percentage of shares outstanding, the count in the company's SEC filings. "Short float" divides the same FINRA short count by the public float, which excludes closely held shares, so it comes out higher for the same company. We publish no float estimates: the float is not a regulatory figure.
What is COLB's days to cover?
3.52 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume. It is published in the same FINRA file and shown verbatim; we hold no volume data ourselves.
Which funds are short?
US public short interest is aggregate-only: individual short sellers are not named. Only some EU markets publish named positions.