Skip to content
HowShorted

How shorted is Omeros Corporation? OMER

#203most shorted US stockof 3,805 ranked stocks, more shorted than 94%

17.26%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.36
5 reports (~10 weeks)
−3.76
days to cover
9.31
Aggregate net short position time series for Omeros Corporation

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 Omeros Corporation 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
12 Aug 202621.42% 31 Jul 202620.22% 14 Aug 2026−1.20
13 May 202621.93% 30 Apr 202622.14% 15 May 2026+0.21
31 Mar 202624.42% 13 Mar 202623.47% 15 Apr 2026−0.95
7 Jan 202618.68% 31 Dec 202523.17% 15 Jan 2026+4.49
13 Nov 202517.86% 31 Oct 202518.83% 14 Nov 2025+0.97
14 Aug 202522.02% 31 Jul 202519.68% 15 Aug 2025−2.34
15 May 202515.79% 30 Apr 202521.09% 30 May 2025+5.30
31 Mar 202516.40% 14 Mar 202518.44% 15 Apr 2025+2.04

Fails to deliver

The SEC's fails-to-deliver figure for OMER: 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
62
4 Sep 2026
Highest in window
311,165
5 Jun 2026
Days with a balance
137
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Omeros Corporation 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 311K 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 202617.26%−0.36
31 Aug 202617.62%−2.60
14 Aug 202620.22%−1.20
31 Jul 202621.42%+0.46
15 Jul 202620.96%−0.06
30 Jun 202621.02%−4.13
15 Jun 202625.15%+2.55
29 May 202622.60%+0.46
15 May 202622.14%+0.21
30 Apr 202621.93%−1.54
15 Apr 202623.47%−0.24
31 Mar 202623.71%−0.71
13 Mar 202624.42%+0.03
27 Feb 202624.39%−0.94
13 Feb 202625.33%+0.42
30 Jan 202624.91%+1.74
15 Jan 202623.17%+4.49
31 Dec 202518.68%−0.95
15 Dec 202519.63%+0.80
28 Nov 202518.83%0.00
14 Nov 202518.83%+0.97
31 Oct 202517.86%−1.08
15 Oct 202518.94%+0.34
30 Sep 202518.60%−1.24
15 Sep 202519.84%+0.53
29 Aug 202519.31%−0.37
15 Aug 202519.68%−2.34
31 Jul 202522.02%−1.40
15 Jul 202523.42%+0.13
30 Jun 202523.29%+0.74
13 Jun 202522.55%+1.46
30 May 202521.09%+2.64
15 May 202518.45%+2.66
30 Apr 202515.79%−2.65
15 Apr 202518.44%+2.38
31 Mar 202516.06%−0.34
14 Mar 202516.40%+0.48
28 Feb 202515.92%−0.39
14 Feb 202516.31%+0.15
31 Jan 202516.16%+0.16
15 Jan 202516.00%+1.44
31 Dec 202414.56%+0.26
13 Dec 202414.30%−1.09
29 Nov 202415.39%−3.12
15 Nov 202418.51%−2.16
31 Oct 202420.67%−0.24
15 Oct 202420.91%+0.32
30 Sep 202420.59%+0.15
13 Sep 202420.44%+0.46
30 Aug 202419.98%−0.19
15 Aug 202420.17%−1.09
31 Jul 202421.26%−0.98
15 Jul 202422.24%+0.09
28 Jun 202422.15%−0.69
14 Jun 202422.84%+0.32
31 May 202422.52%−0.85
15 May 202423.37%−0.05
30 Apr 202423.42%+0.76
15 Apr 202422.66%−0.27
28 Mar 202422.93%+1.30
15 Mar 202421.63%−0.36
29 Feb 202421.99%−0.01
15 Feb 202422.00%+0.23
31 Jan 202421.77%−0.21
12 Jan 202421.98%+1.36
29 Dec 202320.62%+0.15
15 Dec 202320.47%−0.02
30 Nov 202320.49%+0.25
15 Nov 202320.24%−0.22
31 Oct 202320.46%−0.45
13 Oct 202320.91%+0.28
29 Sep 202320.63%+1.38
15 Sep 202319.25%−0.01
31 Aug 202319.26%+0.82
15 Aug 202318.44%+0.34
31 Jul 202318.10%−0.32
14 Jul 202318.42%+0.08
30 Jun 202318.34%+2.77
15 Jun 202315.57%+0.95
31 May 202314.62%+0.17
15 May 202314.45%−0.52
28 Apr 202314.97%+0.60
14 Apr 202314.37%+0.15
31 Mar 202314.22%+0.77
15 Mar 202313.45%+1.08
28 Feb 202312.37%+0.48
15 Feb 202311.89%−1.77
31 Jan 202313.66%+0.07
13 Jan 202313.59%−0.35
30 Dec 202213.94%+0.21
15 Dec 202213.73%−0.94
30 Nov 202214.67%+0.58
15 Nov 202214.09%−0.29
31 Oct 202214.38%−0.41
14 Oct 202214.79%−0.23
30 Sep 202215.02%−0.09
15 Sep 202215.11%−0.76
31 Aug 202215.87%−0.64
15 Aug 202216.51%−2.02
29 Jul 202218.53%−0.81
15 Jul 202219.34%−0.43
30 Jun 202219.77%−1.42
15 Jun 202221.19%+0.32
31 May 202220.87%+1.38
13 May 202219.49%+1.52
29 Apr 202217.97%+0.19
14 Apr 202217.78%−0.07
31 Mar 202217.85%−0.44
15 Mar 202218.29%+0.08
28 Feb 202218.21%−0.62
15 Feb 202218.83%+0.72
31 Jan 202218.11%+0.60
14 Jan 202217.51%+0.04
31 Dec 202117.47%−0.14
15 Dec 202117.61%−1.19
30 Nov 202118.80%+0.44
15 Nov 202118.36%−0.44
29 Oct 202118.80%+0.67
15 Oct 202118.13%+2.32
30 Sep 202115.81%−0.81
15 Sep 202116.62%−0.56
31 Aug 202117.18%−0.77
13 Aug 202117.95%+0.15
30 Jul 202117.80%−0.49
15 Jul 202118.29%−0.94
30 Jun 202119.23%−0.50
15 Jun 202119.73%+0.08
28 May 202119.65%−1.90
14 May 202121.55%+0.16
30 Apr 202121.39%−1.11
15 Apr 202122.50%+1.35
31 Mar 202121.15%−0.16
15 Mar 202121.31%+1.04
26 Feb 202120.27%−0.43
12 Feb 202120.70%+0.59
29 Jan 202120.11%+0.07
15 Jan 202120.04%−0.23
31 Dec 202020.27%+0.11
15 Dec 202020.16%+1.06
30 Nov 202019.10%−0.62
13 Nov 202019.72%−3.03
30 Oct 202022.75%−0.34
15 Oct 202023.09%+0.42
30 Sep 202022.67%−0.34
15 Sep 202023.01%−0.54
31 Aug 202023.55%+3.50
14 Aug 202020.05%+1.78
31 Jul 202018.27%−0.68
15 Jul 202018.95%−1.20
30 Jun 202020.15%−0.04
15 Jun 202020.19%+0.02
29 May 202020.17%+0.02
15 May 202020.15%−0.40
30 Apr 202020.55%+0.35
15 Apr 202020.20%−0.20
31 Mar 202020.40%−0.12
13 Mar 202020.52%+0.04
28 Feb 202020.48%−0.92
14 Feb 202021.40%−0.57
31 Jan 202021.97%−0.20
15 Jan 202022.17%+2.46
31 Dec 201919.71%−0.32
13 Dec 201920.03%−2.81
29 Nov 201922.84%−0.86
15 Nov 201923.70%−0.12
31 Oct 201923.82%−0.08
15 Oct 201923.90%+0.92
30 Sep 201922.98%+0.68
13 Sep 201922.30%−1.36
30 Aug 201923.66%−0.87
15 Aug 201924.53%−1.01
31 Jul 201925.54%+0.42
15 Jul 201925.12%+0.70
28 Jun 201924.42%+1.09
14 Jun 201923.33%+0.49
31 May 201922.84%−0.30
15 May 201923.14%+1.24
30 Apr 201921.90%−0.88
15 Apr 201922.78%−1.49
29 Mar 201924.27%+0.94
15 Mar 201923.33%−0.01
28 Feb 201923.34%+1.49
15 Feb 201921.85%−0.04
31 Jan 201921.89%+1.08
15 Jan 201920.81%−0.35
31 Dec 201821.16%+1.07
14 Dec 201820.09%−0.28
30 Nov 201820.37%−0.38
15 Nov 201820.75%+0.39
31 Oct 201820.36%+0.49
15 Oct 201819.87%+4.46
28 Sep 201815.41%−0.66
14 Sep 201816.07%−1.23
31 Aug 201817.30%−0.88
15 Aug 201818.18%−0.64
31 Jul 201818.82%+0.03
13 Jul 201818.79%−0.17
29 Jun 201818.96%−1.31
15 Jun 201820.27%−1.91
31 May 201822.18%+0.75
15 May 201821.43%−0.43
30 Apr 201821.86%+2.06
13 Apr 201819.80%−0.51
29 Mar 201820.31%+1.32
15 Mar 201818.99%+2.16
28 Feb 201816.83%−1.70
15 Feb 201818.53%+1.34
31 Jan 201817.19%+2.54
12 Jan 201814.65%+0.16
29 Dec 201714.49%–

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

Frequently asked questions

How shorted is Omeros Corporation right now?
17.26% of Omeros Corporation's (OMER) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 203rd 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 OMER'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 OMER's days to cover?
9.31 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.