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HowShorted

How shorted is C4 Therapeutics, Inc.? CCCC

#10most shorted US stockof 3,805 ranked stocks, more shorted than 99%

32.67%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+2.26
5 reports (~10 weeks)
+10.06
days to cover
22.68
Aggregate net short position time series for C4 Therapeutics, 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 C4 Therapeutics, 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
11 Aug 202624.73% 31 Jul 202627.68% 14 Aug 2026+2.95
12 May 202621.73% 30 Apr 202619.22% 15 May 2026−2.51
26 Feb 20267.35% 13 Feb 20268.79% 27 Feb 2026+1.44
6 Nov 20254.96% 31 Oct 20255.00% 14 Nov 2025+0.04
7 Aug 20256.54% 31 Jul 20255.82% 15 Aug 2025−0.72
7 May 20259.08% 30 Apr 20258.95% 15 May 2025−0.13
27 Feb 202511.42% 14 Feb 202512.11% 28 Feb 2025+0.69
14 Jan 202512.19% 31 Dec 202413.15% 15 Jan 2025+0.96

Fails to deliver

The SEC's fails-to-deliver figure for CCCC: 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
110
9 Sep 2026
Highest in window
213,135
6 Oct 2025
Days with a balance
34
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for C4 Therapeutics, 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 213K shares.

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Sector: Healthcare · By year: 2021 · 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202632.67%+2.26
31 Aug 202630.41%+2.73
14 Aug 202627.68%+2.95
31 Jul 202624.73%+3.19
15 Jul 202621.54%−1.07
30 Jun 202622.61%+2.49
15 Jun 202620.12%+0.54
29 May 202619.58%+0.36
15 May 202619.22%−2.51
30 Apr 202621.73%+0.02
15 Apr 202621.71%+5.04
31 Mar 202616.67%+2.70
13 Mar 202613.97%+5.18
27 Feb 20268.79%+1.44
13 Feb 20267.35%−0.09
30 Jan 20267.44%−0.17
15 Jan 20267.61%+0.10
31 Dec 20257.51%+0.11
15 Dec 20257.40%+1.63
28 Nov 20255.77%+0.77
14 Nov 20255.00%+0.04
31 Oct 20254.96%−0.64
15 Oct 20255.60%+0.65
30 Sep 20254.95%−0.03
15 Sep 20254.98%−0.33
29 Aug 20255.31%−0.51
15 Aug 20255.82%−0.72
31 Jul 20256.54%+0.81
15 Jul 20255.73%−1.26
30 Jun 20256.99%−1.99
13 Jun 20258.98%+0.30
30 May 20258.68%−0.27
15 May 20258.95%−0.13
30 Apr 20259.08%−1.87
15 Apr 202510.95%−0.05
31 Mar 202511.00%−0.58
14 Mar 202511.58%−0.53
28 Feb 202512.11%+0.69
14 Feb 202511.42%+0.94
31 Jan 202510.48%−2.67
15 Jan 202513.15%+0.96
31 Dec 202412.19%−0.37
13 Dec 202412.56%+1.25
29 Nov 202411.31%+0.83
15 Nov 202410.48%+2.19
31 Oct 20248.29%−1.30
15 Oct 20249.59%−6.29
30 Sep 202415.88%−1.32
13 Sep 202417.20%+0.43
30 Aug 202416.77%+1.62
15 Aug 202415.15%+0.05
31 Jul 202415.10%−1.80
15 Jul 202416.90%+4.09
28 Jun 202412.81%−8.33
14 Jun 202421.14%+1.86
31 May 202419.28%+2.79
15 May 202416.49%+1.76
30 Apr 202414.73%+0.79
15 Apr 202413.94%+0.60
28 Mar 202413.34%+5.63
15 Mar 20247.71%+3.39
29 Feb 20244.32%−0.31
15 Feb 20244.63%−2.18
31 Jan 20246.81%−4.45
12 Jan 202411.26%+2.05
29 Dec 20239.21%+5.40
30 Nov 20233.81%−0.16
15 Nov 20233.97%+0.10
31 Oct 20233.87%+0.15
13 Oct 20233.72%−0.88
29 Sep 20234.60%−0.24
15 Sep 20234.84%+0.60
31 Aug 20234.24%+0.38
15 Aug 20233.86%−0.43
31 Jul 20234.29%−0.28
14 Jul 20234.57%−0.45
30 Jun 20235.02%−1.79
15 Jun 20236.81%+0.19
31 May 20236.62%+0.71
15 May 20235.91%+0.03
28 Apr 20235.88%+0.10
14 Apr 20235.78%+0.41
31 Mar 20235.37%−0.60
15 Mar 20235.97%−0.67
28 Feb 20236.64%+0.07
15 Feb 20236.57%−0.96
31 Jan 20237.53%+0.23
13 Jan 20237.30%+0.14
30 Dec 20227.16%−0.27
15 Dec 20227.43%+0.01
30 Nov 20227.42%−0.65
15 Nov 20228.07%−1.89
31 Oct 20229.96%−0.15
14 Oct 202210.11%−0.19
30 Sep 202210.30%+1.03
15 Sep 20229.27%−0.69
31 Aug 20229.96%−0.53
15 Aug 202210.49%−0.34
29 Jul 202210.83%+0.12
15 Jul 202210.71%+0.31
30 Jun 202210.40%+1.77
15 Jun 20228.63%−0.17
31 May 20228.80%+0.81
13 May 20227.99%−2.49
29 Apr 202210.48%−0.54
14 Apr 202211.02%+0.49
31 Mar 202210.53%+0.82
15 Mar 20229.71%+2.22
28 Feb 20227.49%+0.60
15 Feb 20226.89%+1.30
31 Jan 20225.59%−0.84
14 Jan 20226.43%−0.10
31 Dec 20216.53%+0.35
15 Dec 20216.18%+0.49
30 Nov 20215.69%0.00
15 Nov 20215.69%+0.11
29 Oct 20215.58%+0.10
15 Oct 20215.48%−0.02
30 Sep 20215.50%+0.82
15 Sep 20214.68%−0.32
31 Aug 20215.00%−0.65
13 Aug 20215.65%−0.50
30 Jul 20216.15%0.00
15 Jul 20216.15%−0.33
30 Jun 20216.48%+1.01
15 Jun 20215.47%−0.21
28 May 20215.68%−0.48
14 May 20216.16%+0.11
30 Apr 20216.05%−0.83
15 Apr 20216.88%−1.63
31 Mar 20218.51%+3.72
15 Mar 20214.79%+0.27
26 Feb 20214.52%+0.81
12 Feb 20213.71%+0.13
29 Jan 20213.58%−0.62
15 Jan 20214.20%+0.23
31 Dec 20203.97%+1.46
15 Dec 20202.51%+0.22
30 Nov 20202.29%+0.51
13 Nov 20201.78%–

Newest first. Scroll inside the table for earlier dates, back to 13 Nov 2020.

Frequently asked questions

How shorted is C4 Therapeutics, Inc. right now?
32.67% of C4 Therapeutics, Inc.'s (CCCC) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 10th 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 CCCC'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 CCCC's days to cover?
22.68 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.