Skip to content
HowShorted

How shorted is X4 Pharmaceuticals, Inc? XFOR

#935most shorted US stockof 3,805 ranked stocks, more shorted than 75%

8.31%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+1.06
5 reports (~10 weeks)
+2.25
days to cover
7.07
Aggregate net short position time series for X4 Pharmaceuticals, 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 X4 Pharmaceuticals, 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
5 Nov 20251.71% 31 Oct 20252.22% 14 Nov 2025+0.51
25 Mar 20255.07% 14 Mar 20254.65% 31 Mar 2025−0.42
13 Nov 20246.78% 31 Oct 20247.59% 15 Nov 2024+0.81
8 Aug 20248.76% 31 Jul 20249.12% 15 Aug 2024+0.36
7 May 20247.85% 30 Apr 20247.27% 15 May 2024−0.58
21 Mar 20248.50% 15 Mar 20247.34% 28 Mar 2024−1.16
9 Nov 20237.00% 31 Oct 20236.85% 15 Nov 2023−0.15
4 May 20232.48% 28 Apr 20232.41% 15 May 2023−0.07

Fails to deliver

The SEC's fails-to-deliver figure for XFOR: 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
11,061
11 Sep 2026
Highest in window
220,693
22 Dec 2025
Days with a balance
86
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for X4 Pharmaceuticals, 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 221K 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

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20268.31%+1.06
31 Aug 20267.25%+0.02
14 Aug 20267.23%−0.13
31 Jul 20267.36%+0.21
15 Jul 20267.15%+1.09
30 Jun 20266.06%+1.46
15 Jun 20264.60%+0.89
29 May 20263.71%+0.49
15 May 20263.22%−0.21
30 Apr 20263.43%−0.03
15 Apr 20263.46%+0.02
31 Mar 20263.44%−0.41
13 Mar 20263.85%−0.10
27 Feb 20263.95%+0.09
13 Feb 20263.86%+0.29
30 Jan 20263.57%+0.03
15 Jan 20263.54%+0.11
31 Dec 20253.43%−0.18
15 Dec 20253.61%+0.77
28 Nov 20252.84%+0.62
14 Nov 20252.22%+0.51
31 Oct 20251.71%−3.36
15 Apr 20255.07%+0.42
31 Mar 20254.65%−0.42
14 Mar 20255.07%−0.49
28 Feb 20255.56%−0.93
14 Feb 20256.49%−3.25
31 Jan 20259.74%+1.79
15 Jan 20257.95%+0.12
31 Dec 20247.83%+0.09
13 Dec 20247.74%+0.41
29 Nov 20247.33%−0.26
15 Nov 20247.59%+0.81
31 Oct 20246.78%−0.73
15 Oct 20247.51%−0.54
30 Sep 20248.05%−0.03
13 Sep 20248.08%−0.96
30 Aug 20249.04%−0.08
15 Aug 20249.12%+0.36
31 Jul 20248.76%−1.07
15 Jul 20249.83%+1.56
28 Jun 20248.27%+1.17
14 Jun 20247.10%+0.03
31 May 20247.07%−0.20
15 May 20247.27%−0.58
30 Apr 20247.85%+0.55
15 Apr 20247.30%−0.04
28 Mar 20247.34%−1.16
15 Mar 20248.50%−0.11
29 Feb 20248.61%+0.70
15 Feb 20247.91%+0.26
31 Jan 20247.65%+0.48
12 Jan 20247.17%+0.22
29 Dec 20236.95%−0.07
15 Dec 20237.02%+0.19
30 Nov 20236.83%−0.02
15 Nov 20236.85%−0.15
31 Oct 20237.00%+0.38
13 Oct 20236.62%+0.16
29 Sep 20236.46%−0.16
15 Sep 20236.62%+0.36
31 Aug 20236.26%−0.45
15 Aug 20236.71%+4.30
15 May 20232.41%−0.07
28 Apr 20232.48%−0.41
14 Apr 20232.89%+1.34
31 Mar 20231.55%+0.15
15 Mar 20231.40%−0.43
28 Feb 20231.83%+0.33
15 Feb 20231.50%−0.06
31 Jan 20231.56%−0.25
13 Jan 20231.81%−0.48
30 Dec 20222.29%+0.36
15 Dec 20221.93%−0.28
30 Nov 20222.21%−0.02
15 Nov 20222.23%−0.11
31 Oct 20222.34%+1.63
15 Sep 20220.71%−0.09
31 Aug 20220.80%−1.08
15 Aug 20221.88%−0.30
29 Jul 20222.18%+0.26
15 Jul 20221.92%−0.02
30 Jun 20221.94%−0.20
15 Jun 20222.14%+0.02
31 May 20222.12%+0.13
13 May 20221.99%−0.02
29 Apr 20222.01%−0.38
14 Apr 20222.39%+0.33
31 Mar 20222.06%+0.23
15 Mar 20221.83%−0.04
28 Feb 20221.87%+0.43
15 Feb 20221.44%−0.76
31 Jan 20222.20%+0.46
14 Jan 20221.74%−1.08
31 Dec 20212.82%+1.15
15 Dec 20211.67%+0.55
30 Nov 20211.12%+0.15
15 Nov 20210.97%0.00
29 Oct 20210.97%−0.08
15 Oct 20211.05%+0.30
30 Sep 20210.75%−0.80
15 Sep 20211.55%+0.03
31 Aug 20211.52%−0.13
13 Aug 20211.65%−0.47
30 Jul 20212.12%−1.28
15 Jul 20213.40%−3.20
15 Jun 20216.60%+1.32
28 May 20215.28%−0.18
14 May 20215.46%+0.90
30 Apr 20214.56%+0.65
15 Apr 20213.91%+0.38
31 Mar 20213.53%+0.39
15 Mar 20213.14%+0.26
26 Feb 20212.88%+0.26
12 Feb 20212.62%+0.33
29 Jan 20212.29%−0.02
15 Jan 20212.31%+0.01
31 Dec 20202.30%+0.19
15 Dec 20202.11%−0.08
30 Nov 20202.19%+0.18
13 Nov 20202.01%+0.08
30 Oct 20201.93%−0.10
15 Oct 20202.03%+0.13
30 Sep 20201.90%+0.11
15 Sep 20201.79%+0.19
31 Aug 20201.60%−0.19
14 Aug 20201.79%+0.15
31 Jul 20201.64%−0.04
15 Jul 20201.68%+0.46
30 Jun 20201.22%+0.24
15 Jun 20200.98%−0.21
29 May 20201.19%−0.10
15 May 20201.29%+0.05
30 Apr 20201.24%−0.03
15 Apr 20201.27%−0.03
31 Mar 20201.30%−0.13
13 Mar 20201.43%−0.39
28 Feb 20201.82%+0.29
14 Feb 20201.53%+0.13
31 Jan 20201.40%−0.12
15 Jan 20201.52%+0.19
31 Dec 20191.33%0.00
13 Dec 20191.33%+0.10
29 Nov 20191.23%−0.22
15 Nov 20191.45%−0.10
31 Oct 20191.55%−0.21
15 Oct 20191.76%–

Newest first. Scroll inside the table for earlier dates, back to 15 Oct 2019.

Frequently asked questions

How shorted is X4 Pharmaceuticals, Inc right now?
8.31% of X4 Pharmaceuticals, Inc's (XFOR) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 935th 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 XFOR'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 XFOR's days to cover?
7.07 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.