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HowShorted

How shorted is Puma Biotechnology Inc? PBYI

#927most shorted US stockof 3,805 ranked stocks, more shorted than 75%

8.37%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.09
5 reports (~10 weeks)
+1.24
days to cover
13.80
Aggregate net short position time series for Puma Biotechnology 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 Puma Biotechnology 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
6 Aug 20268.11% 31 Jul 20268.07% 14 Aug 2026−0.04
7 May 20268.15% 30 Apr 20268.24% 15 May 2026+0.09
26 Feb 20267.27% 13 Feb 20267.47% 27 Feb 2026+0.20
6 Nov 20256.64% 31 Oct 20256.61% 14 Nov 2025−0.03
7 Aug 20255.61% 31 Jul 20255.26% 15 Aug 2025−0.35
8 May 20255.97% 30 Apr 20255.78% 15 May 2025−0.19
27 Feb 20256.25% 14 Feb 20256.43% 28 Feb 2025+0.18
7 Nov 20246.50% 31 Oct 20246.08% 15 Nov 2024−0.42

Fails to deliver

The SEC's fails-to-deliver figure for PBYI: 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
692
17 Aug 2026
Highest in window
6,693
14 Oct 2025
Days with a balance
23
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Puma Biotechnology 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 6.7K shares.

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Sector: Healthcare · By year: 2018 · 2019 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20268.37%+0.09
31 Aug 20268.28%+0.21
14 Aug 20268.07%−0.04
31 Jul 20268.11%+0.43
15 Jul 20267.68%+0.55
30 Jun 20267.13%−0.14
15 Jun 20267.27%−0.20
29 May 20267.47%−0.77
15 May 20268.24%+0.09
30 Apr 20268.15%−0.10
15 Apr 20268.25%+0.44
31 Mar 20267.81%−0.34
13 Mar 20268.15%+0.68
27 Feb 20267.47%+0.20
13 Feb 20267.27%+0.36
30 Jan 20266.91%−0.22
15 Jan 20267.13%+0.29
31 Dec 20256.84%+0.03
15 Dec 20256.81%+0.04
28 Nov 20256.77%+0.16
14 Nov 20256.61%−0.03
31 Oct 20256.64%−0.03
15 Oct 20256.67%−0.31
30 Sep 20256.98%+0.24
15 Sep 20256.74%+1.25
29 Aug 20255.49%+0.23
15 Aug 20255.26%−0.35
31 Jul 20255.61%+0.36
15 Jul 20255.25%−0.06
30 Jun 20255.31%−0.08
13 Jun 20255.39%−0.22
30 May 20255.61%−0.17
15 May 20255.78%−0.19
30 Apr 20255.97%+0.13
15 Apr 20255.84%−0.03
31 Mar 20255.87%+0.18
14 Mar 20255.69%−0.74
28 Feb 20256.43%+0.18
14 Feb 20256.25%+0.17
31 Jan 20256.08%−0.18
15 Jan 20256.26%+0.13
31 Dec 20246.13%+0.21
13 Dec 20245.92%+0.20
29 Nov 20245.72%−0.36
15 Nov 20246.08%−0.42
31 Oct 20246.50%−0.87
15 Oct 20247.37%+0.41
30 Sep 20246.96%−0.41
13 Sep 20247.37%+0.28
30 Aug 20247.09%−1.07
15 Aug 20248.16%+0.37
31 Jul 20247.79%−0.08
15 Jul 20247.87%+1.80
28 Jun 20246.07%+0.48
14 Jun 20245.59%+0.38
31 May 20245.21%−1.10
15 May 20246.31%−0.14
30 Apr 20246.45%−0.54
15 Apr 20246.99%+0.07
28 Mar 20246.92%−0.09
15 Mar 20247.01%−1.59
29 Feb 20248.60%+1.05
15 Feb 20247.55%+0.81
31 Jan 20246.74%+0.40
12 Jan 20246.34%+0.25
29 Dec 20236.09%+0.28
15 Dec 20235.81%+1.52
30 Nov 20234.29%+0.33
15 Nov 20233.96%+0.34
31 Oct 20233.62%−0.04
13 Oct 20233.66%−0.02
29 Sep 20233.68%+0.04
15 Sep 20233.64%+0.12
31 Aug 20233.52%+0.08
15 Aug 20233.44%+0.03
31 Jul 20233.41%−0.15
14 Jul 20233.56%+0.13
30 Jun 20233.43%+0.36
15 Jun 20233.07%+0.15
31 May 20232.92%+0.01
15 May 20232.91%−0.11
28 Apr 20233.02%+0.20
14 Apr 20232.82%−0.02
31 Mar 20232.84%+0.22
15 Mar 20232.62%+0.11
28 Feb 20232.51%+0.06
15 Feb 20232.45%+0.15
31 Jan 20232.30%+0.25
13 Jan 20232.05%+0.12
30 Dec 20221.93%−1.19
15 Dec 20223.12%−0.18
30 Nov 20223.30%+0.02
15 Nov 20223.28%−0.06
31 Oct 20223.34%−0.01
14 Oct 20223.35%−0.15
30 Sep 20223.50%−0.38
15 Sep 20223.88%−0.09
31 Aug 20223.97%−0.05
15 Aug 20224.02%+0.04
29 Jul 20223.98%−0.15
15 Jul 20224.13%−0.33
30 Jun 20224.46%−3.22
15 Jun 20227.68%−0.07
31 May 20227.75%+0.35
13 May 20227.40%+0.33
29 Apr 20227.07%−0.49
14 Apr 20227.56%−0.11
31 Mar 20227.67%+0.72
15 Mar 20226.95%+1.22
28 Feb 20225.73%+0.10
15 Feb 20225.63%−0.38
31 Jan 20226.01%−0.26
14 Jan 20226.27%−0.99
31 Dec 20217.26%+0.44
15 Dec 20216.82%−0.76
30 Nov 20217.58%+1.38
15 Nov 20216.20%+0.25
29 Oct 20215.95%−0.19
15 Oct 20216.14%−0.50
30 Sep 20216.64%−0.37
15 Sep 20217.01%−0.03
31 Aug 20217.04%−0.18
13 Aug 20217.22%−0.32
30 Jul 20217.54%+0.38
15 Jul 20217.16%+0.48
30 Jun 20216.68%−2.65
15 Jun 20219.33%−0.23
28 May 20219.56%−0.63
14 May 202110.19%−0.03
30 Apr 202110.22%−1.35
15 Apr 202111.57%−0.71
31 Mar 202112.28%−0.01
15 Mar 202112.29%+0.02
26 Feb 202112.27%+0.44
12 Feb 202111.83%−0.55
29 Jan 202112.38%+0.11
15 Jan 202112.27%−4.52
31 Dec 202016.79%−2.84
15 Dec 202019.63%+0.15
30 Nov 202019.48%−0.84
13 Nov 202020.32%+0.21
30 Oct 202020.11%+0.38
15 Oct 202019.73%+1.42
30 Sep 202018.31%−0.29
15 Sep 202018.60%−0.17
31 Aug 202018.77%+0.27
14 Aug 202018.50%+0.69
31 Jul 202017.81%+0.27
15 Jul 202017.54%+0.22
30 Jun 202017.32%−1.43
15 Jun 202018.75%−0.16
29 May 202018.91%−1.11
15 May 202020.02%−0.19
30 Apr 202020.21%−1.45
15 Apr 202021.66%−0.28
31 Mar 202021.94%+3.19
13 Mar 202018.75%+0.59
28 Feb 202018.16%−0.68
14 Feb 202018.84%−1.57
31 Jan 202020.41%+0.33
15 Jan 202020.08%+2.22
31 Dec 201917.86%−0.31
13 Dec 201918.17%+0.68
29 Nov 201917.49%+0.49
15 Nov 201917.00%−2.81
31 Oct 201919.81%−1.24
15 Oct 201921.05%+0.05
30 Sep 201921.00%−1.96
13 Sep 201922.96%+0.22
30 Aug 201922.74%−0.03
15 Aug 201922.77%+3.76
31 Jul 201919.01%−0.52
15 Jul 201919.53%+1.82
28 Jun 201917.71%+7.53
14 Jun 201910.18%−1.06
31 May 201911.24%+0.50
15 May 201910.74%−0.66
30 Apr 201911.40%−1.04
15 Apr 201912.44%+2.59
29 Mar 20199.85%−2.69
15 Mar 201912.54%+0.36
28 Feb 201912.18%−0.82
15 Feb 201913.00%−0.65
31 Jan 201913.65%+1.87
15 Jan 201911.78%+0.89
31 Dec 201810.89%+1.61
14 Dec 20189.28%−0.88
30 Nov 201810.16%+0.20
15 Nov 20189.96%−2.38
31 Oct 201812.34%−0.99
15 Oct 201813.33%+1.17
28 Sep 201812.16%+1.57
14 Sep 201810.59%+1.03
31 Aug 20189.56%−1.85
15 Aug 201811.41%−0.75
31 Jul 201812.16%−0.55
13 Jul 201812.71%+0.70
29 Jun 201812.01%+4.72
15 Jun 20187.29%+0.10
31 May 20187.19%−0.73
15 May 20187.92%−0.34
30 Apr 20188.26%−0.04
13 Apr 20188.30%−0.41
29 Mar 20188.71%+0.09
15 Mar 20188.62%−0.64
28 Feb 20189.26%−0.37
15 Feb 20189.63%+0.50
31 Jan 20189.13%+1.82
12 Jan 20187.31%+0.21
29 Dec 20177.10%–

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

Frequently asked questions

How shorted is Puma Biotechnology Inc right now?
8.37% of Puma Biotechnology Inc's (PBYI) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 927th 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 PBYI'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 PBYI's days to cover?
13.80 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.