Skip to content
HowShorted

How shorted is Karyopharm Therapeutics Inc.? KPTI

#5most shorted US stockof 3,805 ranked stocks, more shorted than 99%

34.68%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−8.59
5 reports (~10 weeks)
+5.63
days to cover
5.01
Aggregate net short position time series for Karyopharm 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 Karyopharm 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
13 Aug 202633.34% 31 Jul 202642.51% 14 Aug 2026+9.17
14 May 202628.86% 30 Apr 202623.28% 15 May 2026−5.58
12 Feb 202615.59% 30 Jan 202613.45% 13 Feb 2026−2.14
12 Jan 20264.08% 31 Dec 20258.58% 15 Jan 2026+4.50
3 Nov 20257.48% 31 Oct 20258.26% 14 Nov 2025+0.78
8 Oct 202526.03% 30 Sep 202516.59% 15 Oct 2025−9.44
11 Aug 202524.62% 31 Jul 202524.73% 15 Aug 2025+0.11
13 Jan 202515.53% 31 Dec 202415.80% 15 Jan 2025+0.27

Fails to deliver

The SEC's fails-to-deliver figure for KPTI: 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.

Latest balance
14,881
14 Sep 2026
Highest in window
981,756
6 Aug 2026
Days with a balance
105
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Karyopharm 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 982K shares.

Embed this chart

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

Download chart cardShare on XRedditLinkedIn
Cite this page
Plain
Wikipedia
BibTeX

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

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202634.68%−8.59
31 Aug 202643.27%+0.76
14 Aug 202642.51%+9.17
31 Jul 202633.34%+5.49
15 Jul 202627.85%−1.20
30 Jun 202629.05%+4.41
15 Jun 202624.64%+1.04
29 May 202623.60%+0.32
15 May 202623.28%−5.58
30 Apr 202628.86%−2.31
15 Apr 202631.17%+1.42
31 Mar 202629.75%+10.17
13 Mar 202619.58%+3.38
27 Feb 202616.20%+2.75
13 Feb 202613.45%−2.14
30 Jan 202615.59%+7.01
15 Jan 20268.58%+4.50
31 Dec 20254.08%+0.63
15 Dec 20253.45%−0.49
28 Nov 20253.94%−4.32
14 Nov 20258.26%+0.78
31 Oct 20257.48%−9.11
15 Oct 202516.59%−9.44
30 Sep 202526.03%+0.61
15 Sep 202525.42%+0.26
29 Aug 202525.16%+0.43
15 Aug 202524.73%+0.11
31 Jul 202524.62%+0.68
15 Jul 202523.94%+0.45
30 Jun 202523.49%+0.08
13 Jun 202523.41%−0.59
30 May 202524.00%−0.17
15 May 202524.17%+7.70
14 Feb 202516.47%+0.40
31 Jan 202516.07%+0.27
15 Jan 202515.80%+0.27
31 Dec 202415.53%−0.26
13 Dec 202415.79%+0.69
29 Nov 202415.10%−0.01
15 Nov 202415.11%+0.99
31 Oct 202414.12%−0.01
15 Oct 202414.13%−0.79
30 Sep 202414.92%+0.54
13 Sep 202414.38%−0.47
30 Aug 202414.85%+0.21
15 Aug 202414.64%−0.10
31 Jul 202414.74%−1.31
15 Jul 202416.05%−2.34
28 Jun 202418.39%+0.22
14 Jun 202418.17%+1.05
31 May 202417.12%+2.20
15 May 202414.92%0.00
30 Apr 202414.92%−5.56
15 Apr 202420.48%+0.54
28 Mar 202419.94%−0.16
15 Mar 202420.10%−0.27
29 Feb 202420.37%−0.09
15 Feb 202420.46%+3.96
31 Jan 202416.50%+0.19
12 Jan 202416.31%+0.64
29 Dec 202315.67%+0.18
15 Dec 202315.49%−0.69
30 Nov 202316.18%−0.31
15 Nov 202316.49%+0.85
31 Oct 202315.64%+0.26
13 Oct 202315.38%+0.83
29 Sep 202314.55%+1.40
15 Sep 202313.15%+0.29
31 Aug 202312.86%+0.17
15 Aug 202312.69%−0.43
31 Jul 202313.12%+0.97
14 Jul 202312.15%+1.14
30 Jun 202311.01%−3.48
15 Jun 202314.49%+0.04
31 May 202314.45%−0.57
15 May 202315.02%−0.73
28 Apr 202315.75%+0.08
14 Apr 202315.67%−1.18
31 Mar 202316.85%+2.09
15 Mar 202314.76%−1.41
28 Feb 202316.17%−2.65
15 Feb 202318.82%−9.69
31 Jan 202328.51%+1.81
13 Jan 202326.70%+0.94
30 Dec 202225.76%+5.52
15 Dec 202220.24%+3.45
30 Nov 202216.79%−0.02
15 Nov 202216.81%+0.15
31 Oct 202216.66%−0.50
14 Oct 202217.16%+0.32
30 Sep 202216.84%−1.02
15 Sep 202217.86%−1.05
31 Aug 202218.91%−2.43
15 Aug 202221.34%−1.18
29 Jul 202222.52%−0.25
15 Jul 202222.77%+2.19
30 Jun 202220.58%+1.25
15 Jun 202219.33%+1.11
31 May 202218.22%−0.13
13 May 202218.35%+0.78
29 Apr 202217.57%+0.58
14 Apr 202216.99%−0.50
31 Mar 202217.49%+3.04
15 Mar 202214.45%−1.33
28 Feb 202215.78%+1.20
15 Feb 202214.58%−0.52
31 Jan 202215.10%−0.40
14 Jan 202215.50%−0.55
31 Dec 202116.05%−1.80
15 Dec 202117.85%+1.02
30 Nov 202116.83%−0.30
15 Nov 202117.13%−0.23
29 Oct 202117.36%−0.32
15 Oct 202117.68%−1.44
30 Sep 202119.12%+1.65
15 Sep 202117.47%−0.98
31 Aug 202118.45%−0.14
13 Aug 202118.59%−1.35
30 Jul 202119.94%−0.09
15 Jul 202120.03%−0.01
30 Jun 202120.04%+0.81
15 Jun 202119.23%+0.97
28 May 202118.26%−1.53
14 May 202119.79%−0.02
30 Apr 202119.81%−1.50
15 Apr 202121.31%+0.57
31 Mar 202120.74%−0.14
15 Mar 202120.88%−1.57
26 Feb 202122.45%+1.06
12 Feb 202121.39%+2.11
29 Jan 202119.28%−2.27
15 Jan 202121.55%+0.59
31 Dec 202020.96%+0.98
15 Dec 202019.98%−0.40
30 Nov 202020.38%−0.71
13 Nov 202021.09%−0.29
30 Oct 202021.38%+0.36
15 Oct 202021.02%+0.65
30 Sep 202020.37%+0.77
15 Sep 202019.60%+0.17
31 Aug 202019.43%−1.64
14 Aug 202021.07%−0.11
31 Jul 202021.18%−1.65
15 Jul 202022.83%+1.52
30 Jun 202021.31%+1.50
15 Jun 202019.81%+0.86
29 May 202018.95%+0.75
15 May 202018.20%−0.27
30 Apr 202018.47%−3.31
15 Apr 202021.78%+1.53
31 Mar 202020.25%+1.36
13 Mar 202018.89%−0.98
28 Feb 202019.87%+0.31
14 Feb 202019.56%−1.03
31 Jan 202020.59%+5.27
15 Jan 202015.32%+0.08
31 Dec 201915.24%−1.11
13 Dec 201916.35%−1.33
29 Nov 201917.68%+0.36
15 Nov 201917.32%+0.30
31 Oct 201917.02%−2.47
15 Oct 201919.49%−3.58
30 Sep 201923.07%−0.61
13 Sep 201923.68%+4.66
30 Aug 201919.02%+0.71
15 Aug 201918.31%−0.18
31 Jul 201918.49%+1.94
15 Jul 201916.55%+2.16
28 Jun 201914.39%−0.33
14 Jun 201914.72%+1.52
31 May 201913.20%+2.23
15 May 201910.97%−0.62
30 Apr 201911.59%−0.86
15 Apr 201912.45%+0.12
29 Mar 201912.33%−0.22
15 Mar 201912.55%−0.37
28 Feb 201912.92%+0.37
15 Feb 201912.55%+2.72
31 Jan 20199.83%−0.13
15 Jan 20199.96%−0.05
31 Dec 201810.01%+0.85
14 Dec 20189.16%−1.90
30 Nov 201811.06%−0.13
15 Nov 201811.19%+0.68
31 Oct 201810.51%−0.59
15 Oct 201811.10%+2.81
28 Sep 20188.29%0.00
14 Sep 20188.29%−0.12
31 Aug 20188.41%+0.24
15 Aug 20188.17%−2.15
31 Jul 201810.32%−0.50
13 Jul 201810.82%−0.11
29 Jun 201810.93%+1.84
15 Jun 20189.09%+1.71
31 May 20187.38%−0.63
15 May 20188.01%+0.85
30 Apr 20187.16%+1.97
13 Apr 20185.19%+0.44
29 Mar 20184.75%+0.56
15 Mar 20184.19%−0.28
28 Feb 20184.47%+0.14
15 Feb 20184.33%+0.28
31 Jan 20184.05%−0.05
12 Jan 20184.10%+0.08
29 Dec 20174.02%–

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

Frequently asked questions

How shorted is Karyopharm Therapeutics Inc. right now?
34.68% of Karyopharm Therapeutics Inc.'s (KPTI) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 5th 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 KPTI'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 KPTI's days to cover?
5.01 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.