Skip to content
HowShorted

IBB short interest Nasdaq Global Market

iShares Biotechnology ETF. FINRA's reported shares short for this symbol, twice a month by settlement date, shown as the regulator publishes them. No percentage is shown: no SEC filer maps to the symbol (funds, notes, preferreds, warrants and foreign listings).

Shares short
12,267,170
vs previous settlement
+1,281,791 (+11.7%)
days to cover
7.85
Settlement date
15 Sep 2026

Shares short over time

Aggregate net short position time series for IBB 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 IBB days to cover

Fails to deliver

The SEC's fails-to-deliver figure for IBB: 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
15,820
14 Sep 2026
Highest in window
1,407,562
23 Mar 2026
Days with a balance
159
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for iShares Biotechnology ETF 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 1.4M shares.

History

Every FINRA settlement we hold for IBB, newest first. สณ marks a figure FINRA itself flagged as revised.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 202612,267,170+1,281,7917.85
31 Aug 202610,985,379+544,9446.63
14 Aug 202610,440,435+397,9657.36
31 Jul 202610,042,470โˆ’1,867,2387.06
15 Jul 202611,909,708โˆ’198,6336.42
30 Jun 202612,108,341โˆ’327,0707.08
15 Jun 202612,435,411โˆ’808,1858.73
29 May 202613,243,596+234,2338.78
15 May 202613,009,363โˆ’257,9069.67
30 Apr 202613,267,269+683,2299.08
15 Apr 202612,584,040โˆ’714,6109.39
31 Mar 202613,298,650โˆ’1,016,7417.84
13 Mar 202614,315,391โˆ’577,5677.65
27 Feb 202614,892,958โˆ’167,0269.32
13 Feb 202615,059,984+2,338,5166.94
30 Jan 202612,721,468+20,9077.48
15 Jan 202612,700,561+104,8196.17
31 Dec 202512,595,742โˆ’782,8598.52
15 Dec 202513,378,601+1,159,9338.09
28 Nov 202512,218,668โˆ’145,6584.09
14 Nov 202512,364,326+570,2374.81
31 Oct 202511,794,089+91,6116.03
15 Oct 202511,702,478โˆ’850,3965.00
30 Sep 202512,552,874+1,718,7456.00
15 Sep 202510,834,129+401,2425.52
29 Aug 202510,432,887โˆ’36,9698.22
15 Aug 202510,469,856โˆ’1,652,2356.13
31 Jul 202512,122,091+931,6069.75
15 Jul 202511,190,485โˆ’910,3746.86
30 Jun 202512,100,859โˆ’492,1107.31
13 Jun 202512,592,969+443,0225.76
30 May 202512,149,947โˆ’708,9027.12
15 May 202512,858,849+1,734,8115.32
30 Apr 202511,124,038+714,6517.04
15 Apr 202510,409,387+686,2084.27
31 Mar 20259,723,179โˆ’100,1089.72
14 Mar 20259,823,287+457,8788.00
28 Feb 20259,365,409+222,6748.91
14 Feb 20259,142,735โˆ’951,0646.09
31 Jan 202510,093,799โˆ’1,017,7517.57
15 Jan 202511,111,550โˆ’113,8506.81
31 Dec 202411,225,400โˆ’449,0977.37
13 Dec 202411,674,497+416,4429.60
29 Nov 202411,258,055+975,1477.02
15 Nov 202410,282,908+140,3936.82
31 Oct 202410,142,515+319,56910.46
15 Oct 20249,822,946+142,4819.73
30 Sep 20249,680,465+381,2277.69
13 Sep 20249,299,238โˆ’880,1888.39
30 Aug 202410,179,426+40,22812.59
15 Aug 202410,139,198โˆ’786,0707.41
31 Jul 202410,925,268โˆ’1,289,2387.71
15 Jul 202412,214,506+641,7528.73
28 Jun 202411,572,754โˆ’1,268,6319.45
14 Jun 202412,841,385โˆ’1,382,07911.60
31 May 202414,223,464+722,12110.00
15 May 202413,501,343+890,1698.50
30 Apr 202412,611,174โˆ’551,2617.61
15 Apr 202413,162,435+639,2698.96
28 Mar 202412,523,166+1,066,0158.29
15 Mar 202411,457,151+821,2925.85
29 Feb 202410,635,859+65,3844.91
15 Feb 202410,570,475+1,386,3335.65
31 Jan 20249,184,142+446,7925.17
12 Jan 20248,737,350+354,8464.61
29 Dec 20238,382,504โˆ’1,373,3515.76
15 Dec 20239,755,855โˆ’951,7755.12
30 Nov 202310,707,630+569,6987.35
15 Nov 202310,137,932โˆ’409,2004.29
31 Oct 202310,547,132+637,4474.09
13 Oct 20239,909,685โˆ’247,6184.27
29 Sep 202310,157,303+731,9756.35
15 Sep 20239,425,328โˆ’713,5346.83
31 Aug 202310,138,862โˆ’39,5767.92
15 Aug 202310,178,438+186,1657.63
31 Jul 20239,992,273+260,4006.70
14 Jul 20239,731,873โˆ’765,7496.31
30 Jun 202310,497,622+34,0024.86
15 Jun 202310,463,620+976,2267.18
31 May 20239,487,394+116,9925.95
15 May 20239,370,402โˆ’643,3906.59
28 Apr 202310,013,792+238,9476.24
14 Apr 20239,774,845โˆ’70,6156.87
31 Mar 20239,845,460โˆ’689,4776.71
15 Mar 202310,534,937+1,166,4655.22
28 Feb 20239,368,472โˆ’703,7756.28
15 Feb 202310,072,247+635,1056.22
31 Jan 20239,437,142โˆ’430,0507.23
13 Jan 20239,867,192โˆ’571,8336.67
30 Dec 202210,439,025+466,7686.75
15 Dec 20229,972,257โˆ’956,4365.23
30 Nov 202210,928,693+515,5956.75
15 Nov 202210,413,098+673,3544.18
31 Oct 20229,739,744โˆ’1,770,0325.28
14 Oct 202211,509,776+2,331,1926.65
30 Sep 20229,178,584+1,316,6683.73
15 Sep 20227,861,916+896,7233.60
31 Aug 20226,965,193โˆ’1,704,9794.93
15 Aug 20228,670,172+1,087,4944.58
29 Jul 20227,582,678โˆ’176,2054.87
15 Jul 20227,758,883โˆ’1,129,5153.46
30 Jun 20228,888,398+100,9942.85
15 Jun 20228,787,404+991,6204.48
31 May 20227,795,784โˆ’502,1733.42
13 May 20228,297,957+255,5702.08
29 Apr 20228,042,387โˆ’600,0822.66
14 Apr 20228,642,469โˆ’910,0653.37
31 Mar 20229,552,534โˆ’2,417,3103.98
15 Mar 202211,969,844+696,2924.97
28 Feb 202211,273,552+1,075,6734.70
15 Feb 202210,197,879โˆ’484,3943.58
31 Jan 202210,682,273+446,3432.82
14 Jan 202210,235,930+899,2843.49
31 Dec 20219,336,646โˆ’965,0224.46
15 Dec 202110,301,668โˆ’150,1273.80
30 Nov 202110,451,795โˆ’1,325,4014.30
15 Nov 202111,777,196+753,7456.31
29 Oct 202111,023,451โˆ’9,3046.78
15 Oct 202111,032,755โˆ’1,889,4415.22
30 Sep 202112,922,196+1,242,4655.73
15 Sep 202111,679,731+218,6256.12
31 Aug 202111,461,106+61,5565.27
13 Aug 202111,399,550โˆ’1,649,2203.49
30 Jul 202113,048,770โˆ’811,6833.85
15 Jul 202113,860,453โˆ’663,8275.55
30 Jun 202114,524,280โˆ’278,8305.67
15 Jun 202114,803,110สณโˆ’128,7963.34
28 May 202114,931,906โˆ’950,7315.22
14 May 202115,882,637โˆ’3,195,8594.12
30 Apr 202119,078,496โˆ’106,6646.59
15 Apr 202119,185,160+1,864,2776.07
31 Mar 202117,320,883โˆ’492,6914.70
15 Mar 202117,813,574โˆ’1,970,0554.39
26 Feb 202119,783,629โˆ’2,280,2877.34
12 Feb 202122,063,916+1,125,94310.20
29 Jan 202120,937,973โˆ’744,9237.41
15 Jan 202121,682,896โˆ’2,712,5267.51
31 Dec 202024,395,422โˆ’2,789,9439.81
15 Dec 202027,185,365โˆ’1,178,29610.93
30 Nov 202028,363,661+5,226,25711.45
13 Nov 202023,137,404โˆ’734,9065.55
30 Oct 202023,872,310สณ+2,084,4109.89
15 Oct 202021,787,900+695,33610.65
30 Sep 202021,092,564+310,9198.43
15 Sep 202020,781,645โˆ’2,138,6636.42
31 Aug 202022,920,308+392,5229.93
14 Aug 202022,527,786+533,7728.44
31 Jul 202021,994,014+1,440,1738.81
15 Jul 202020,553,841+186,3766.76
30 Jun 202020,367,465โˆ’1,344,4026.18
15 Jun 202021,711,867+4,815,3825.37
29 May 202016,896,485+2,163,7195.16
15 May 202014,732,766สณ+1,526,6864.40
30 Apr 202013,206,080+1,157,7924.45
15 Apr 202012,048,288โˆ’1,834,4164.15
31 Mar 202013,882,704โˆ’2,866,3723.90
13 Mar 202016,749,076โˆ’1,225,5443.40
28 Feb 202017,974,620โˆ’820,0204.39
14 Feb 202018,794,640โˆ’49,4446.92
31 Jan 202018,844,084โˆ’1,884,3897.92
15 Jan 202020,728,473+3,838,2776.27
31 Dec 201916,890,196โˆ’645,0267.17
13 Dec 201917,535,222+638,7788.60
29 Nov 201916,896,444โˆ’1,025,9955.22
15 Nov 201917,922,439+1,808,1388.30
31 Oct 201916,114,301โˆ’236,7468.51
15 Oct 201916,351,047โˆ’1,019,2435.47
30 Sep 201917,370,290+2,875,7067.51
13 Sep 201914,494,584โˆ’465,6246.76
30 Aug 201914,960,208โˆ’470,1886.87
15 Aug 201915,430,396+69,4735.01
31 Jul 201915,360,923+96,7987.35
15 Jul 201915,264,125+2,096,9495.46
28 Jun 201913,167,176โˆ’257,9065.50
14 Jun 201913,425,082+80,4478.30
31 May 201913,344,635โˆ’578,2586.06
15 May 201913,922,893+1,498,7915.03
30 Apr 201912,424,102+1,286,3793.30
15 Apr 201911,137,723โˆ’614,0414.66
29 Mar 201911,751,764+1,302,2764.18
15 Mar 201910,449,488+163,9303.75
28 Feb 201910,285,558+1,038,1056.50
15 Feb 20199,247,453โˆ’626,5025.05
31 Jan 20199,873,955+930,1484.72
15 Jan 20198,943,807+1,303,3123.72
31 Dec 20187,640,495โˆ’671,8342.14
14 Dec 20188,312,329โˆ’1,290,9764.40
30 Nov 20189,603,305โˆ’333,2495.60
15 Nov 20189,936,554+926,9355.02
31 Oct 20189,009,619โˆ’2,216,2683.30
15 Oct 201811,225,887+153,0475.11
28 Sep 201811,072,840โˆ’356,9636.75
14 Sep 201811,429,803+880,8807.56
31 Aug 201810,548,923+117,9845.91
15 Aug 201810,430,939+542,5035.66
31 Jul 20189,888,436โˆ’2,714,6353.72
13 Jul 201812,603,071สณ+364,8285.11
29 Jun 201812,238,243+1,418,7094.04
15 Jun 201810,819,534+302,6165.29
31 May 201810,516,918+850,9414.05
15 May 20189,665,977+944,0693.43
30 Apr 20188,721,908โˆ’151,3554.10
13 Apr 20188,873,263โˆ’374,7723.35
29 Mar 20189,248,035+73,7963.27
15 Mar 20189,174,239โˆ’689,5412.73
28 Feb 20189,863,780โˆ’666,4044.33
15 Feb 201810,530,184+1,245,3792.42
31 Jan 20189,284,805+443,8853.17
12 Jan 20188,840,920สณโˆ’528,1073.20
29 Dec 20179,369,027โ€“6.45

Scroll inside the table for earlier settlements, back to 29 Dec 2017.

Questions

Frequently asked questions

What is IBB's short interest?
12,267,170 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, up 1,281,791 from the previous settlement.
Why is there no percentage for IBB?
Because no defensible share count exists to divide by: no SEC filer maps to the symbol (funds, notes, preferreds, warrants and foreign listings). No SEC filer maps to this symbol in EDGAR's ticker file. That is the normal case for funds, exchange-traded notes, preferred shares, warrants, units and foreign listings, none of which file a share count we could divide by.
What is IBB's days to cover?
7.85 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.

Ranked companies with a percentage: most shorted US stocks. Other symbols with counts only: shares short without a percentage. Browse by name: US companies A to Z.