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HowShorted

How shorted is HALOZYME THERAPEUTICS, INC.? HALO

#390most shorted US stockof 3,805 ranked stocks, more shorted than 89%

13.35%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.24
5 reports (~10 weeks)
+2.20
days to cover
11.59
Aggregate net short position time series for HALOZYME 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 HALOZYME 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
6 Aug 202612.35% 31 Jul 202612.90% 14 Aug 2026+0.55
11 May 202612.12% 30 Apr 202611.29% 15 May 2026−0.83
17 Feb 202611.69% 13 Feb 202611.44% 27 Feb 2026−0.25
28 Jan 202611.56% 15 Jan 202611.49% 30 Jan 2026−0.07
3 Nov 20259.61% 31 Oct 202510.61% 14 Nov 2025+1.00
5 Aug 20258.49% 31 Jul 20259.04% 15 Aug 2025+0.55
6 May 20257.68% 30 Apr 20258.68% 15 May 2025+1.00
18 Feb 20257.49% 14 Feb 20257.92% 28 Feb 2025+0.43

Fails to deliver

The SEC's fails-to-deliver figure for HALO: 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
395
31 Aug 2026
Highest in window
143,617
1 Oct 2025
Days with a balance
79
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for HALOZYME 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 144K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202613.35%+0.24
31 Aug 202613.11%+0.21
14 Aug 202612.90%+0.55
31 Jul 202612.35%+1.14
15 Jul 202611.21%+0.06
30 Jun 202611.15%+0.23
15 Jun 202610.92%−0.58
29 May 202611.50%+0.21
15 May 202611.29%−0.83
30 Apr 202612.12%+0.04
15 Apr 202612.08%+0.18
31 Mar 202611.90%+0.29
13 Mar 202611.61%+0.17
27 Feb 202611.44%−0.25
13 Feb 202611.69%+0.20
30 Jan 202611.49%−0.07
15 Jan 202611.56%−0.18
31 Dec 202511.74%+1.11
15 Dec 202510.63%+0.11
28 Nov 202510.52%−0.09
14 Nov 202510.61%+1.00
31 Oct 20259.61%−0.23
15 Oct 20259.84%+0.61
30 Sep 20259.23%−0.84
15 Sep 202510.07%−0.09
29 Aug 202510.16%+1.12
15 Aug 20259.04%+0.55
31 Jul 20258.49%+0.70
15 Jul 20257.79%−0.47
30 Jun 20258.26%−0.72
13 Jun 20258.98%+0.42
30 May 20258.56%−0.12
15 May 20258.68%+1.00
30 Apr 20257.68%−0.13
15 Apr 20257.81%+0.32
31 Mar 20257.49%−0.69
14 Mar 20258.18%+0.26
28 Feb 20257.92%+0.43
14 Feb 20257.49%+0.37
31 Jan 20257.12%−0.27
15 Jan 20257.39%−0.08
31 Dec 20247.47%+0.56
13 Dec 20246.91%+0.18
29 Nov 20246.73%−1.48
15 Nov 20248.21%+0.15
31 Oct 20248.06%−0.16
15 Oct 20248.22%+0.44
30 Sep 20247.78%+0.17
13 Sep 20247.61%−0.32
30 Aug 20247.93%+0.29
15 Aug 20247.64%+0.58
31 Jul 20247.06%+0.22
15 Jul 20246.84%−0.25
28 Jun 20247.09%−0.22
14 Jun 20247.31%+0.58
31 May 20246.73%+0.01
15 May 20246.72%+0.11
30 Apr 20246.61%+0.11
15 Apr 20246.50%+0.28
28 Mar 20246.22%−0.25
15 Mar 20246.47%+0.10
29 Feb 20246.37%+0.34
15 Feb 20246.03%+0.25
31 Jan 20245.78%+0.36
12 Jan 20245.42%−0.14
29 Dec 20235.56%−0.12
15 Dec 20235.68%+0.29
30 Nov 20235.39%+0.11
15 Nov 20235.28%+0.30
31 Oct 20234.98%−0.03
13 Oct 20235.01%+0.11
29 Sep 20234.90%−0.29
15 Sep 20235.19%0.00
31 Aug 20235.19%−0.34
15 Aug 20235.53%−0.18
31 Jul 20235.71%+0.39
14 Jul 20235.32%+0.28
30 Jun 20235.04%−0.08
15 Jun 20235.12%−0.17
31 May 20235.29%+0.28
15 May 20235.01%+0.12
28 Apr 20234.89%+0.04
14 Apr 20234.85%+0.02
31 Mar 20234.83%−0.05
15 Mar 20234.88%−0.21
28 Feb 20235.09%+0.09
15 Feb 20235.00%−0.18
31 Jan 20235.18%−1.23
13 Jan 20236.41%−0.33
30 Dec 20226.74%−0.27
15 Dec 20227.01%−0.14
30 Nov 20227.15%−0.35
15 Nov 20227.50%−0.50
31 Oct 20228.00%−0.32
14 Oct 20228.32%−0.47
30 Sep 20228.79%+0.91
15 Sep 20227.88%+0.13
31 Aug 20227.75%+1.24
15 Aug 20226.51%−0.10
29 Jul 20226.61%+0.16
15 Jul 20226.45%+0.53
30 Jun 20225.92%−0.22
15 Jun 20226.14%+0.07
31 May 20226.07%+0.31
13 May 20225.76%−0.08
29 Apr 20225.84%+0.48
14 Apr 20225.36%+0.18
31 Mar 20225.18%+0.19
15 Mar 20224.99%+0.26
28 Feb 20224.73%+0.16
15 Feb 20224.57%+0.07
31 Jan 20224.50%+0.08
14 Jan 20224.42%−0.21
31 Dec 20214.63%0.00
15 Dec 20214.63%+0.12
30 Nov 20214.51%+0.25
15 Nov 20214.26%−0.28
29 Oct 20214.54%+0.31
15 Oct 20214.23%−0.09
30 Sep 20214.32%+0.30
15 Sep 20214.02%−0.16
31 Aug 20214.18%+0.20
13 Aug 20213.98%−0.04
30 Jul 20214.02%−0.47
15 Jul 20214.49%−0.05
30 Jun 20214.54%−0.01
15 Jun 20214.55%−0.26
28 May 20214.81%−0.22
14 May 20215.03%−0.46
30 Apr 20215.49%+0.28
15 Apr 20215.21%−0.54
31 Mar 20215.75%−0.38
15 Mar 20216.13%−3.06
26 Feb 20219.19%−1.49
12 Feb 202110.68%−0.56
29 Jan 202111.24%−0.04
15 Jan 202111.28%+0.29
31 Dec 202010.99%−0.45
15 Dec 202011.44%−0.86
30 Nov 202012.30%+1.50
13 Nov 202010.80%+0.85
30 Oct 20209.95%−0.98
15 Oct 202010.93%+0.25
30 Sep 202010.68%−0.46
15 Sep 202011.14%−0.12
31 Aug 202011.26%−0.45
14 Aug 202011.71%−0.20
31 Jul 202011.91%−0.41
15 Jul 202012.32%+0.28
30 Jun 202012.04%+0.10
15 Jun 202011.94%+0.08
29 May 202011.86%+0.29
15 May 202011.57%+0.37
30 Apr 202011.20%+0.96
15 Apr 202010.24%+0.12
31 Mar 202010.12%−0.09
13 Mar 202010.21%+0.18
28 Feb 202010.03%+0.74
14 Feb 20209.29%+0.43
31 Jan 20208.86%+0.40
15 Jan 20208.46%−0.03
31 Dec 20198.49%−0.06
13 Dec 20198.55%+0.08
29 Nov 20198.47%+3.33
15 Nov 20195.14%+0.18
31 Oct 20194.96%−0.39
15 Oct 20195.35%−0.36
30 Sep 20195.71%+0.26
13 Sep 20195.45%+0.03
30 Aug 20195.42%+0.04
15 Aug 20195.38%+0.24
31 Jul 20195.14%−0.33
15 Jul 20195.47%+0.34
28 Jun 20195.13%+0.15
14 Jun 20194.98%−0.23
31 May 20195.21%+1.46
15 May 20193.75%+0.09
30 Apr 20193.66%+0.08
15 Apr 20193.58%−0.17
29 Mar 20193.75%−0.52
15 Mar 20194.27%+0.15
28 Feb 20194.12%+0.23
15 Feb 20193.89%+0.16
31 Jan 20193.73%−0.09
15 Jan 20193.82%+0.02
31 Dec 20183.80%+0.30
14 Dec 20183.50%−0.16
30 Nov 20183.66%−0.40
15 Nov 20184.06%−0.20
31 Oct 20184.26%+0.05
15 Oct 20184.21%−1.29
28 Sep 20185.50%−0.14
14 Sep 20185.64%−0.08
31 Aug 20185.72%−0.10
15 Aug 20185.82%−0.05
31 Jul 20185.87%−0.06
13 Jul 20185.93%+0.16
29 Jun 20185.77%−0.58
15 Jun 20186.35%+0.54
31 May 20185.81%−0.24
15 May 20186.05%+0.10
30 Apr 20185.95%−0.17
13 Apr 20186.12%−0.12
29 Mar 20186.24%−0.47
15 Mar 20186.71%−0.52
28 Feb 20187.23%+0.23
15 Feb 20187.00%−0.19
31 Jan 20187.19%−0.98
12 Jan 20188.17%+0.36
29 Dec 20177.81%–

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

Frequently asked questions

How shorted is HALOZYME THERAPEUTICS, INC. right now?
13.35% of HALOZYME THERAPEUTICS, INC.'s (HALO) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 390th 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 HALO'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 HALO's days to cover?
11.59 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.