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HowShorted

How shorted is Ardelyx, Inc.? ARDX

#643most shorted US stockof 3,805 ranked stocks, more shorted than 83%

10.27%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+1.15
5 reports (~10 weeks)
0.00
days to cover
6.34
Aggregate net short position time series for Ardelyx, 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 Ardelyx, 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 202610.53% 31 Jul 20269.00% 14 Aug 2026−1.53
30 Apr 20269.79% 15 Apr 20269.66% 15 May 2026−0.13
19 Feb 20268.37% 13 Feb 20268.92% 27 Feb 2026+0.55
8 Jan 202610.10% 31 Dec 20258.99% 15 Jan 2026−1.11
30 Oct 20257.93% 15 Oct 20258.32% 31 Oct 2025+0.39
4 Aug 202510.89% 31 Jul 20259.81% 15 Aug 2025−1.08
1 May 202512.47% 30 Apr 202511.61% 15 May 2025−0.86
20 Feb 202511.70% 14 Feb 202512.51% 28 Feb 2025+0.81

Fails to deliver

The SEC's fails-to-deliver figure for ARDX: 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
1,778
10 Sep 2026
Highest in window
711,463
25 Mar 2026
Days with a balance
39
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Ardelyx, 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 711K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202610.27%+1.15
31 Aug 20269.12%+0.12
14 Aug 20269.00%−1.53
31 Jul 202610.53%−0.10
15 Jul 202610.63%+0.36
30 Jun 202610.27%−0.64
15 Jun 202610.91%+0.88
29 May 202610.03%+0.37
15 May 20269.66%+0.12
30 Apr 20269.54%−0.25
15 Apr 20269.79%−0.18
31 Mar 20269.97%+1.12
13 Mar 20268.85%−0.07
27 Feb 20268.92%+0.55
13 Feb 20268.37%+0.73
30 Jan 20267.64%−1.35
15 Jan 20268.99%−1.11
31 Dec 202510.10%+1.60
15 Dec 20258.50%+0.23
28 Nov 20258.27%+0.63
14 Nov 20257.64%−0.68
31 Oct 20258.32%+0.39
15 Oct 20257.93%−0.15
30 Sep 20258.08%−0.12
15 Sep 20258.20%−0.70
29 Aug 20258.90%−0.91
15 Aug 20259.81%−1.08
31 Jul 202510.89%−0.64
15 Jul 202511.53%−0.06
30 Jun 202511.59%+0.19
13 Jun 202511.40%−0.74
30 May 202512.14%+0.53
15 May 202511.61%−0.86
30 Apr 202512.47%−0.20
15 Apr 202512.67%−0.19
31 Mar 202512.86%+0.12
14 Mar 202512.74%+0.23
28 Feb 202512.51%+0.81
14 Feb 202511.70%+0.46
31 Jan 202511.24%+1.27
15 Jan 20259.97%−0.28
31 Dec 202410.25%+0.19
13 Dec 202410.06%−0.21
29 Nov 202410.27%+0.43
15 Nov 20249.84%−0.32
31 Oct 202410.16%+0.44
15 Oct 20249.72%−0.07
30 Sep 20249.79%−1.22
13 Sep 202411.01%+0.45
30 Aug 202410.56%−0.48
15 Aug 202411.04%−0.24
31 Jul 202411.28%−0.51
15 Jul 202411.79%−0.53
28 Jun 202412.32%−0.97
14 Jun 202413.29%+0.07
31 May 202413.22%−0.90
15 May 202414.12%−0.91
30 Apr 202415.03%+0.42
15 Apr 202414.61%−0.47
28 Mar 202415.08%−0.56
15 Mar 202415.64%+1.16
29 Feb 202414.48%+1.53
15 Feb 202412.95%+0.82
31 Jan 202412.13%−0.37
12 Jan 202412.50%−1.71
29 Dec 202314.21%+0.02
15 Dec 202314.19%−1.35
30 Nov 202315.54%−0.88
15 Nov 202316.42%+0.71
31 Oct 202315.71%+4.55
13 Oct 202311.16%+0.98
29 Sep 202310.18%−1.07
15 Sep 202311.25%−0.58
31 Aug 202311.83%−0.91
15 Aug 202312.74%+0.03
31 Jul 202312.71%+0.33
14 Jul 202312.38%+0.20
30 Jun 202312.18%+3.60
15 Jun 20238.58%+0.58
31 May 20238.00%+0.22
15 May 20237.78%−0.72
28 Apr 20238.50%−1.63
14 Apr 202310.13%+0.68
31 Mar 20239.45%+2.52
15 Mar 20236.93%+1.06
28 Feb 20235.87%+0.47
15 Feb 20235.40%−0.24
31 Jan 20235.64%−0.59
13 Jan 20236.23%−0.37
30 Dec 20226.60%+0.99
15 Dec 20225.61%−1.01
30 Nov 20226.62%+2.04
15 Nov 20224.58%+0.67
31 Oct 20223.91%−1.23
14 Oct 20225.14%+0.11
30 Sep 20225.03%+0.57
15 Sep 20224.46%−0.78
31 Aug 20225.24%−0.22
15 Aug 20225.46%−2.07
29 Jul 20227.53%+0.04
15 Jul 20227.49%+0.25
30 Jun 20227.24%−1.17
15 Jun 20228.41%−0.55
31 May 20228.96%+0.89
13 May 20228.07%−2.17
29 Apr 202210.24%+1.70
14 Apr 20228.54%−0.11
31 Mar 20228.65%+0.30
15 Mar 20228.35%+0.75
28 Feb 20227.60%+0.08
15 Feb 20227.52%+1.03
31 Jan 20226.49%−0.49
14 Jan 20226.98%−0.13
31 Dec 20217.11%−3.74
15 Dec 202110.85%+5.23
30 Nov 20215.62%+0.39
15 Nov 20215.23%−2.23
29 Oct 20217.46%+1.17
15 Oct 20216.29%−0.13
30 Sep 20216.42%−1.23
15 Sep 20217.65%−0.73
31 Aug 20218.38%−1.54
13 Aug 20219.92%−0.81
30 Jul 202110.73%+0.72
15 Jul 202110.01%+0.74
30 Jun 20219.27%+1.61
15 Jun 20217.66%−0.85
28 May 20218.51%−0.95
14 May 20219.46%+0.46
30 Apr 20219.00%−1.16
15 Apr 202110.16%+1.18
31 Mar 20218.98%+3.17
15 Mar 20215.81%+0.67
26 Feb 20215.14%−0.22
12 Feb 20215.36%+0.22
29 Jan 20215.14%+0.12
15 Jan 20215.02%−0.28
31 Dec 20205.30%−0.22
15 Dec 20205.52%−0.95
30 Nov 20206.47%+0.76
13 Nov 20205.71%−0.67
30 Oct 20206.38%+0.72
15 Oct 20205.66%−0.50
30 Sep 20206.16%−0.49
15 Sep 20206.65%−0.46
31 Aug 20207.11%−0.18
14 Aug 20207.29%+0.61
31 Jul 20206.68%−0.24
15 Jul 20206.92%+0.80
30 Jun 20206.12%+2.50
15 Jun 20203.62%+0.34
29 May 20203.28%+0.13
15 May 20203.15%+0.01
30 Apr 20203.14%−0.19
15 Apr 20203.33%−0.09
31 Mar 20203.42%−0.53
13 Mar 20203.95%−1.15
28 Feb 20205.10%+0.64
14 Feb 20204.46%+0.42
31 Jan 20204.04%+0.26
15 Jan 20203.78%−2.49
31 Dec 20196.27%+1.88
13 Dec 20194.39%+2.35
29 Nov 20192.04%−0.19
15 Nov 20192.23%−0.53
31 Oct 20192.76%+0.25
15 Oct 20192.51%+0.24
30 Sep 20192.27%+0.71
13 Sep 20191.56%+0.76
30 Aug 20190.80%+0.18
15 Aug 20190.62%−0.04
31 Jul 20190.66%−0.07
15 Jul 20190.73%−0.18
28 Jun 20190.91%0.00
14 Jun 20190.91%−0.03
31 May 20190.94%−0.05
15 May 20190.99%−0.03
30 Apr 20191.02%+0.04
15 Apr 20190.98%0.00
29 Mar 20190.98%−0.21
15 Mar 20191.19%+0.06
28 Feb 20191.13%−0.09
15 Feb 20191.22%−0.08
31 Jan 20191.30%+0.02
15 Jan 20191.28%+0.18
31 Dec 20181.10%−0.23
14 Dec 20181.33%+0.05
30 Nov 20181.28%+0.18
15 Nov 20181.10%+0.17
31 Oct 20180.93%−0.05
15 Oct 20180.98%−0.25
28 Sep 20181.23%+0.35
14 Sep 20180.88%−0.02
31 Aug 20180.90%−0.13
15 Aug 20181.03%−0.30
31 Jul 20181.33%+0.17
13 Jul 20181.16%−0.22
29 Jun 20181.38%+0.61
15 Jun 20180.77%−0.45
31 May 20181.22%−1.53
15 May 20182.75%−0.06
30 Apr 20182.81%−0.16
13 Apr 20182.97%−0.53
29 Mar 20183.50%−0.20
15 Mar 20183.70%−0.16
28 Feb 20183.86%+0.33
15 Feb 20183.53%+0.41
31 Jan 20183.12%−0.44
12 Jan 20183.56%−0.40
29 Dec 20173.96%–

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

Frequently asked questions

How shorted is Ardelyx, Inc. right now?
10.27% of Ardelyx, Inc.'s (ARDX) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 643rd 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 ARDX'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 ARDX's days to cover?
6.34 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.