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 TCCO'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 TCCO's days to cover?

1.00 days for settlement date 15 Jan 2021: 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.

How shorted was TECHNICAL COMMUNICATIONS CORP? TCCO

TECHNICAL COMMUNICATIONS CORP left the US market in 2021. This page is a frozen archive of its reported short interest, ending 15 Jan 2021. The ticker TCCO no longer refers to this company and may since have been reassigned.

0.16%

of shares outstanding reported short · settlement date 15 Jan 2021

vs previous report: −0.06
5 reports (~10 weeks): −0.05
days to cover: 1.00

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.

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 filed	Settlement before	Settlement after	Change
28 Dec 2020	0.22% 15 Dec 2020	0.16% 15 Jan 2021	−0.06
24 Jun 2019	1.52% 31 May 2019	0.89% 28 Jun 2019	−0.63
10 Dec 2018	1.75% 30 Nov 2018	1.54% 14 Dec 2018	−0.21
6 Aug 2018	3.56% 31 Jul 2018	4.14% 15 Aug 2018	+0.58
7 May 2018	3.46% 30 Apr 2018	3.42% 15 May 2018	−0.04
9 Feb 2018	3.41% 31 Jan 2018	3.55% 15 Feb 2018	+0.14

Embed this chart

Paste this snippet to embed the interactive chart. It updates with each FINRA report and keeps the source attribution. Preview

<iframe src="https://howshorted.com/embed/us/tcco-2025/" width="100%" height="430" style="border:0" loading="lazy" title="TECHNICAL COMMUNICATIONS CORP short interest chart"></iframe>
<p>Source: FINRA data compiled by <a href="https://howshorted.com/us/company/tcco-2025/">howshorted.com</a></p>

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Plain

Short position data for TECHNICAL COMMUNICATIONS CORP: FINRA, compiled by howshorted.com, settlement date 15 Jan 2021. https://howshorted.com/us/company/tcco-2025/

Wikipedia

<ref>{{cite web |title=TECHNICAL COMMUNICATIONS CORP short position data |url=https://howshorted.com/us/company/tcco-2025/ |website=HowShorted |publisher=howshorted.com (data: FINRA) |date=2021-01-15 |access-date=2026-10-13}}</ref>

BibTeX

@misc{howshorted-technical-communications-corp-2021-01-15,
  title        = {TECHNICAL COMMUNICATIONS CORP short position data},
  author       = {{HowShorted}},
  howpublished = {\url{https://howshorted.com/us/company/tcco-2025/}},
  note         = {Data: FINRA, settlement date 15 Jan 2021; accessed 2026-10-13},
  year         = {2021}
}

Sector: Technology

History

Full reported short interest history
Settlement date	Short %	Change
15 Jan 2021	0.16%	−0.06
15 Dec 2020	0.22%	−0.01
13 Nov 2020	0.23%	−0.14
30 Sep 2020	0.37%	+0.07
31 Aug 2020	0.30%	+0.09
14 Aug 2020	0.21%	+0.20
15 May 2020	0.01%	−6.15
31 Dec 2019	6.16%	−7.11
13 Dec 2019	13.27%	+12.88
31 Oct 2019	0.39%	−0.11
15 Oct 2019	0.50%	0.00
30 Sep 2019	0.50%	−0.18
13 Sep 2019	0.68%	+0.02
30 Aug 2019	0.66%	+0.29
15 Aug 2019	0.37%	−0.52
28 Jun 2019	0.89%	−0.63
31 May 2019	1.52%	+1.12
15 May 2019	0.40%	−2.50
15 Apr 2019	2.90%	+1.02
31 Dec 2018	1.88%	+0.34
14 Dec 2018	1.54%	−0.21
30 Nov 2018	1.75%	+0.15
15 Nov 2018	1.60%	−0.11
31 Oct 2018	1.71%	−0.96
15 Oct 2018	2.67%	+0.05
28 Sep 2018	2.62%	−0.37
14 Sep 2018	2.99%	−0.13
31 Aug 2018	3.12%	−1.02
15 Aug 2018	4.14%	+0.58
31 Jul 2018	3.56%	−0.47
13 Jul 2018	4.03%	−0.16
29 Jun 2018	4.19%	+0.42
15 Jun 2018	3.77%	−0.77
31 May 2018	4.54%	+1.12
15 May 2018	3.42%	−0.04
30 Apr 2018	3.46%	+0.89
13 Apr 2018	2.57%	−0.24
29 Mar 2018	2.81%	+0.21
15 Mar 2018	2.60%	−0.31
28 Feb 2018	2.91%	−0.64
15 Feb 2018	3.55%	+0.14
31 Jan 2018	3.41%	+0.84
12 Jan 2018	2.57%	−1.29
29 Dec 2017	3.86%	–

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

Frequently asked questions

How shorted was TECHNICAL COMMUNICATIONS CORP?: TECHNICAL COMMUNICATIONS CORP left the US market in 2021. Its final reported figure was 0.16% of shares outstanding for settlement date 15 Jan 2021, per FINRA's consolidated short interest report; this page preserves its full history.
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 TCCO'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 TCCO's days to cover?: 1.00 days for settlement date 15 Jan 2021: 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.