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EFFI short interest NYSE Arca

Harbor Osmosis International R. FINRA's reported shares short for this symbol, twice a month by settlement date, shown as the regulator publishes them. No percentage is shown: exchange-traded product: its share count floats with creation and redemption.

Shares short
5,415
vs previous settlement
−732 (-11.9%)
days to cover
51.08
Settlement date
15 Sep 2026

Shares short over time

Aggregate net short position time series for EFFI shares short

Days to cover

FINRA's own figure: reported shares short divided by the security's average daily trading volume, published alongside each settlement.

Aggregate net short position time series for EFFI days to cover

Fails to deliver

The SEC's fails-to-deliver figure for EFFI: 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
7
14 Sep 2026
Highest in window
52,412
23 Mar 2026
Days with a balance
110
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Harbor Osmosis International R 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 52K shares.

History

Every FINRA settlement we hold for EFFI, newest first.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 20265,415−73251.08
31 Aug 20266,147−6221.05
14 Aug 20266,769+12616.43
31 Jul 20266,643−20834.42
15 Jul 20266,851−6115.19
30 Jun 20266,912−25821.60
15 Jun 20267,170−46845.09
29 May 20267,638−41972.06
15 May 20268,057−87311.68
30 Apr 20268,930+8,4348.84
15 Apr 2026496+3241.98
31 Mar 2026172+691.00
13 Mar 2026103−3301.00
27 Feb 2026433+1993.64
13 Feb 2026234+43.21
30 Jan 2026230+381.10
15 Jan 2026192−1921.24
31 Dec 2025384+1871.29
15 Dec 2025197−45.18
28 Nov 2025201+32.39
14 Nov 2025198+332.51
31 Oct 2025165−1163.37
15 Oct 2025281+293.31
30 Sep 2025252−413.26
15 Sep 2025256−865.95
29 Aug 2025342+1713.60
15 Aug 2025171−5,6031.00
31 Jul 20255,774+4,82014.05
15 Jul 2025954−26215.64
30 Jun 20251,216−254.81
13 Jun 20251,241+1,22311.71
30 May 202518−1,3859.00
15 May 20251,403+1,19912.75
30 Apr 2025204+551.00
15 Apr 2025199+1866.33
31 Mar 2025181+1060.33
14 Mar 2025171+3024.43
28 Feb 2025141+947.00
14 Feb 2025132+166.00
31 Jan 2025131+13010.92
15 Jan 20251−1871.00
31 Dec 2024188–2.58

Scroll inside the table for earlier settlements, back to 31 Dec 2024.

Questions

Frequently asked questions

What is EFFI's short interest?
5,415 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, down 732 from the previous settlement.
Why is there no percentage for EFFI?
Because no defensible share count exists to divide by: exchange-traded product: its share count floats with creation and redemption. An exchange-traded product's share count changes every day as units are created and redeemed, so no filing gives a stable count to divide by. FINRA's shares-short figure is exact; a percentage of it would not be.
What is EFFI's days to cover?
51.08 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume, published in the same file and shown verbatim. We hold no volume data ourselves.
Is this the short float?
No. This page shows FINRA's share count only. Short float divides that count by the public float, and short interest as we publish it elsewhere divides it by shares outstanding from SEC filings. Neither denominator is available for this line, so neither ratio is shown.
How often does this update?
FINRA member firms report short positions as of the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. We ingest each file the day it appears and re-read recent settlements for revisions.

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