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HowShorted

How shorted is PROTO LABS, INC.? PRLB

#2,407most shorted US stockof 3,805 ranked stocks, more shorted than 36%

3.15%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.58
5 reports (~10 weeks)
+0.29
days to cover
4.82
Aggregate net short position time series for PROTO LABS, 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 PROTO LABS, 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
31 Jul 20262.84% 15 Jul 20262.74% 14 Aug 2026−0.10
1 May 20262.58% 30 Apr 20262.71% 15 May 2026+0.13
6 Feb 20262.18% 30 Jan 20262.26% 13 Feb 2026+0.08
31 Oct 20252.48% 15 Oct 20252.97% 14 Nov 2025+0.49
31 Jul 20252.76% 15 Jul 20252.80% 15 Aug 2025+0.04
2 May 20253.47% 30 Apr 20253.54% 15 May 2025+0.07
7 Feb 20252.43% 31 Jan 20252.79% 14 Feb 2025+0.36
1 Nov 20244.14% 31 Oct 20242.90% 15 Nov 2024−1.24

Fails to deliver

The SEC's fails-to-deliver figure for PRLB: 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
1,000
20 Jul 2026
Highest in window
5,257
4 Mar 2026
Days with a balance
27
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for PROTO LABS, 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 5.3K shares.

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Sector: Industrials

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20263.15%+0.58
31 Aug 20262.57%−0.17
14 Aug 20262.74%−0.08
31 Jul 20262.82%−0.02
15 Jul 20262.84%−0.02
30 Jun 20262.86%−0.08
15 Jun 20262.94%+0.23
29 May 20262.71%0.00
15 May 20262.71%+0.13
30 Apr 20262.58%−0.16
15 Apr 20262.74%+0.08
31 Mar 20262.66%+0.18
13 Mar 20262.48%+0.20
27 Feb 20262.28%+0.02
13 Feb 20262.26%+0.08
30 Jan 20262.18%+0.25
15 Jan 20261.93%−0.02
31 Dec 20251.95%−0.34
15 Dec 20252.29%−0.25
28 Nov 20252.54%−0.43
14 Nov 20252.97%+0.40
31 Oct 20252.57%+0.09
15 Oct 20252.48%−0.17
30 Sep 20252.65%−0.23
15 Sep 20252.88%+0.03
29 Aug 20252.85%+0.05
15 Aug 20252.80%+0.13
31 Jul 20252.67%−0.09
15 Jul 20252.76%−0.44
30 Jun 20253.20%−0.08
13 Jun 20253.28%−0.17
30 May 20253.45%−0.09
15 May 20253.54%+0.07
30 Apr 20253.47%−0.21
15 Apr 20253.68%+0.35
31 Mar 20253.33%+0.42
14 Mar 20252.91%−0.21
28 Feb 20253.12%+0.33
14 Feb 20252.79%+0.36
31 Jan 20252.43%−0.30
15 Jan 20252.73%−0.05
31 Dec 20242.78%−0.86
13 Dec 20243.64%+0.45
29 Nov 20243.19%+0.29
15 Nov 20242.90%−1.24
31 Oct 20244.14%+0.27
15 Oct 20243.87%−0.07
30 Sep 20243.94%+1.17
13 Sep 20242.77%+0.05
30 Aug 20242.72%+0.18
15 Aug 20242.54%+0.61
31 Jul 20241.93%+0.04
15 Jul 20241.89%+0.11
28 Jun 20241.78%−0.29
14 Jun 20242.07%−0.17
31 May 20242.24%+0.08
15 May 20242.16%+0.23
30 Apr 20241.93%+0.01
15 Apr 20241.92%−0.11
28 Mar 20242.03%−0.38
15 Mar 20242.41%+0.16
29 Feb 20242.25%+0.41
15 Feb 20241.84%−0.08
31 Jan 20241.92%+0.11
12 Jan 20241.81%−0.03
29 Dec 20231.84%−0.60
15 Dec 20232.44%−0.03
30 Nov 20232.47%−0.09
15 Nov 20232.56%+0.57
31 Oct 20231.99%−0.82
13 Oct 20232.81%−0.42
29 Sep 20233.23%−0.25
15 Sep 20233.48%+0.09
31 Aug 20233.39%+0.58
15 Aug 20232.81%−0.02
31 Jul 20232.83%−0.22
14 Jul 20233.05%−0.19
30 Jun 20233.24%−0.63
15 Jun 20233.87%−0.01
31 May 20233.88%+0.15
15 May 20233.73%+0.11
28 Apr 20233.62%−0.10
14 Apr 20233.72%+0.12
31 Mar 20233.60%−0.71
15 Mar 20234.31%+0.27
28 Feb 20234.04%+0.25
15 Feb 20233.79%+0.33
31 Jan 20233.46%+0.18
13 Jan 20233.28%−0.11
30 Dec 20223.39%+0.42
15 Dec 20222.97%−0.42
30 Nov 20223.39%−0.36
15 Nov 20223.75%+0.32
31 Oct 20223.43%−0.01
14 Oct 20223.44%−0.33
30 Sep 20223.77%+0.55
15 Sep 20223.22%−0.19
31 Aug 20223.41%+0.31
15 Aug 20223.10%−0.07
29 Jul 20223.17%−0.19
15 Jul 20223.36%−0.16
30 Jun 20223.52%+0.08
15 Jun 20223.44%+0.23
31 May 20223.21%−0.11
13 May 20223.32%−0.06
29 Apr 20223.38%+0.15
14 Apr 20223.23%−0.88
31 Mar 20224.11%−0.31
15 Mar 20224.42%−0.49
28 Feb 20224.91%+0.14
15 Feb 20224.77%−0.08
31 Jan 20224.85%−0.84
14 Jan 20225.69%−0.54
31 Dec 20216.23%0.00
15 Dec 20216.23%−2.89
30 Nov 20219.12%−0.68
15 Nov 20219.80%+0.06
29 Oct 20219.74%−0.99
15 Oct 202110.73%+1.06
30 Sep 20219.67%−0.13
15 Sep 20219.80%−0.33
31 Aug 202110.13%+0.82
13 Aug 20219.31%+0.73
30 Jul 20218.58%+0.02
15 Jul 20218.56%−1.21
30 Jun 20219.77%−0.60
15 Jun 202110.37%+0.13
28 May 202110.24%−0.01
14 May 202110.25%+0.61
30 Apr 20219.64%+0.10
15 Apr 20219.54%+0.31
31 Mar 20219.23%−0.39
15 Mar 20219.62%+2.31
26 Feb 20217.31%+0.39
12 Feb 20216.92%−0.86
29 Jan 20217.78%−6.91
15 Jan 202114.69%−1.92
31 Dec 202016.61%−2.07
15 Dec 202018.68%+0.10
30 Nov 202018.58%+0.85
13 Nov 202017.73%+1.60
30 Oct 202016.13%+0.76
15 Oct 202015.37%+0.72
30 Sep 202014.65%−0.02
15 Sep 202014.67%−1.08
31 Aug 202015.75%+0.11
14 Aug 202015.64%−0.31
31 Jul 202015.95%−2.85
15 Jul 202018.80%+0.75
30 Jun 202018.05%+1.17
15 Jun 202016.88%+1.16
29 May 202015.72%−0.61
15 May 202016.33%−0.98
30 Apr 202017.31%−0.88
15 Apr 202018.19%+1.18
31 Mar 202017.01%+2.18
13 Mar 202014.83%+1.00
28 Feb 202013.83%+0.32
14 Feb 202013.51%+0.90
31 Jan 202012.61%+0.01
15 Jan 202012.60%+0.17
31 Dec 201912.43%+0.92
13 Dec 201911.51%+0.23
29 Nov 201911.28%+0.12
15 Nov 201911.16%−0.11
31 Oct 201911.27%+0.37
15 Oct 201910.90%+0.41
30 Sep 201910.49%+0.84
13 Sep 20199.65%+0.12
30 Aug 20199.53%+0.45
15 Aug 20199.08%−0.04
31 Jul 20199.12%+2.04
15 Jul 20197.08%+0.76
28 Jun 20196.32%+0.50
14 Jun 20195.82%+0.11
31 May 20195.71%+0.23
15 May 20195.48%−0.24
30 Apr 20195.72%+0.35
15 Apr 20195.37%+0.07
29 Mar 20195.30%+0.29
15 Mar 20195.01%+0.41
28 Feb 20194.60%+0.13
15 Feb 20194.47%−0.14
31 Jan 20194.61%+0.07
15 Jan 20194.54%+0.08
31 Dec 20184.46%−0.41
14 Dec 20184.87%−0.31
30 Nov 20185.18%+0.29
15 Nov 20184.89%+0.37
31 Oct 20184.52%−0.56
15 Oct 20185.08%−0.98
28 Sep 20186.06%+0.40
14 Sep 20185.66%+0.52
31 Aug 20185.14%0.00
15 Aug 20185.14%−0.01
31 Jul 20185.15%+0.15
13 Jul 20185.00%+0.11
29 Jun 20184.89%+0.20
15 Jun 20184.69%+0.19
31 May 20184.50%−0.20
15 May 20184.70%−0.29
30 Apr 20184.99%+0.01
13 Apr 20184.98%+0.25
29 Mar 20184.73%−0.10
15 Mar 20184.83%−0.93
28 Feb 20185.76%−0.87
15 Feb 20186.63%−2.19
31 Jan 20188.82%−0.71
12 Jan 20189.53%−0.36
29 Dec 20179.89%–

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

Frequently asked questions

How shorted is PROTO LABS, INC. right now?
3.15% of PROTO LABS, INC.'s (PRLB) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,407th 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 PRLB'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 PRLB's days to cover?
4.82 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.