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HowShorted

XBI short interest NYSE Arca

State Street SPDR S&P Biotech. 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
75,264,165
vs previous settlement
+807,405 (+1.1%)
days to cover
9.91
Settlement date
15 Sep 2026

Shares short over time

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

Fails to deliver

The SEC's fails-to-deliver figure for XBI: 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
184
14 Sep 2026
Highest in window
2,544,861
30 Mar 2026
Days with a balance
203
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for State Street SPDR S&P Biotech 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 2.5M shares.

History

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

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 202675,264,165+807,4059.91
31 Aug 202674,456,760โˆ’2,677,5858.10
14 Aug 202677,134,345โˆ’1,713,57710.39
31 Jul 202678,847,922+3,738,3659.52
15 Jul 202675,109,557โˆ’38,8218.34
30 Jun 202675,148,378โˆ’3,920,3246.30
15 Jun 202679,068,702+2,075,5929.09
29 May 202676,993,110+2,652,0039.72
15 May 202674,341,107โˆ’418,2978.73
30 Apr 202674,759,404+1,424,50610.24
15 Apr 202673,334,898โˆ’12,107,7037.59
31 Mar 202685,442,601+8,714,9488.10
13 Mar 202676,727,653+111,2207.35
27 Feb 202676,616,433โˆ’190,2828.42
13 Feb 202676,806,715โˆ’1,327,6449.00
30 Jan 202678,134,359โˆ’2,049,8108.82
15 Jan 202680,184,169+2,427,8877.08
31 Dec 202577,756,282โˆ’2,719,92610.08
15 Dec 202580,476,208+4,355,8857.82
28 Nov 202576,120,323โˆ’18,0947.46
14 Nov 202576,138,417+7,191,5575.80
31 Oct 202568,946,860โˆ’3,354,8406.99
15 Oct 202572,301,700โˆ’5,221,6286.81
30 Sep 202577,523,328+4,471,0267.75
15 Sep 202573,052,302โˆ’1,735,7817.40
29 Aug 202574,788,083โˆ’1,528,00710.56
15 Aug 202576,316,090โˆ’3,181,6567.84
31 Jul 202579,497,746+9,912,9257.14
15 Jul 202569,584,821โˆ’5,090,3887.21
30 Jun 202574,675,209โˆ’3,302,8857.80
13 Jun 202577,978,094+5,894,2997.25
30 May 202572,083,795โˆ’1,476,1876.77
15 May 202573,559,982+817,2525.09
30 Apr 202572,742,730+6,333,5846.88
15 Apr 202566,409,146+3,704,4943.49
31 Mar 202562,704,652+3,639,9728.29
14 Mar 202559,064,680+618,3646.20
28 Feb 202558,446,316+1,057,1436.94
14 Feb 202557,389,173+1,248,0186.31
31 Jan 202556,141,155โˆ’1,869,0576.38
15 Jan 202558,010,212+1,339,2945.86
31 Dec 202456,670,918+2,839,0516.83
13 Dec 202453,831,867โˆ’2,499,1166.59
29 Nov 202456,330,983โˆ’2,161,9435.59
15 Nov 202458,492,926+2,552,0605.01
31 Oct 202455,940,866โˆ’950,5828.90
15 Oct 202456,891,448+2,095,4438.25
30 Sep 202454,796,005+508,2666.37
13 Sep 202454,287,739โˆ’1,210,9358.47
30 Aug 202455,498,674+4,539,3499.41
15 Aug 202450,959,325โˆ’319,4685.91
31 Jul 202451,278,793โˆ’5,577,2046.14
15 Jul 202456,855,997โˆ’4,000,5007.23
28 Jun 202460,856,497+1,251,4047.90
14 Jun 202459,605,093+3,497,6846.82
31 May 202456,107,409+128,2636.95
15 May 202455,979,146โˆ’1,605,0245.26
30 Apr 202457,584,170+3,044,9185.12
15 Apr 202454,539,252+1,427,1464.77
28 Mar 202453,112,106โˆ’471,9334.88
15 Mar 202453,584,039+2,151,0274.65
29 Feb 202451,433,012+1,088,4763.89
15 Feb 202450,344,536+4,789,9834.47
31 Jan 202445,554,553+1,477,5534.13
12 Jan 202444,077,000+2,631,2023.36
29 Dec 202341,445,798+2,627,0104.02
15 Dec 202338,818,788+2,188,6593.29
30 Nov 202336,630,129โˆ’6,591,7203.72
15 Nov 202343,221,849สณโˆ’7,232,1903.15
31 Oct 202350,454,039+3,779,7244.72
13 Oct 202346,674,315+1,942,2364.13
29 Sep 202344,732,079+2,598,0694.68
15 Sep 202342,134,010+1,427,0426.85
31 Aug 202340,706,968+777,3947.08
15 Aug 202339,929,574โˆ’1,463,3086.16
31 Jul 202341,392,882+86,1796.57
14 Jul 202341,306,703+116,9917.70
30 Jun 202341,189,712โˆ’1,984,1876.20
15 Jun 202343,173,899+2,049,9236.54
31 May 202341,123,976+2,741,2395.04
15 May 202338,382,737โˆ’1,864,9534.38
28 Apr 202340,247,690โˆ’4,561,9105.26
14 Apr 202344,809,600+2,368,4045.25
31 Mar 202342,441,196+54,5214.99
15 Mar 202342,386,675+5,043,5733.99
28 Feb 202337,343,102+823,9934.43
15 Feb 202336,519,109โˆ’2,129,5584.30
31 Jan 202338,648,667+1,481,7274.16
13 Jan 202337,166,940+2,495,6303.42
30 Dec 202234,671,310+459,3373.77
15 Dec 202234,211,973โˆ’1,231,3143.99
30 Nov 202235,443,287โˆ’1,430,6194.53
15 Nov 202236,873,906+915,9552.90
31 Oct 202235,957,951โˆ’555,1823.49
14 Oct 202236,513,133โˆ’461,1303.61
30 Sep 202236,974,263+6,737,9612.82
15 Sep 202230,236,302โˆ’3,024,7582.76
31 Aug 202233,261,060+1,042,7003.47
15 Aug 202232,218,360โˆ’5,730,0372.46
29 Jul 202237,948,397+36,1443.62
15 Jul 202237,912,253+1,701,4172.89
30 Jun 202236,210,836+1,177,7902.38
15 Jun 202235,033,046โˆ’1,436,4172.77
31 May 202236,469,463+468,1542.72
13 May 202236,001,309+1,000,2171.67
29 Apr 202235,001,092โˆ’163,6312.24
14 Apr 202235,164,723+6,114,5292.69
31 Mar 202229,050,194โˆ’3,130,7402.61
15 Mar 202232,180,934+321,4512.53
28 Feb 202231,859,483โˆ’3,709,8432.29
15 Feb 202235,569,326โˆ’3,857,8882.53
31 Jan 202239,427,214+4,282,6222.21
14 Jan 202235,144,592+4,037,0422.56
31 Dec 202131,107,550โˆ’1,226,4062.76
15 Dec 202132,333,956+3,444,0992.99
30 Nov 202128,889,857+645,9443.58
15 Nov 202128,243,913โˆ’4,705,4424.60
29 Oct 202132,949,355+1,494,7266.39
15 Oct 202131,454,629+1,320,1027.53
30 Sep 202130,134,527โˆ’4,402,5756.63
15 Sep 202134,537,102+799,5228.16
31 Aug 202133,737,580โˆ’1,310,1646.32
13 Aug 202135,047,744โˆ’2,700,5587.65
30 Jul 202137,748,302+909,3997.51
15 Jul 202136,838,903+244,7516.75
30 Jun 202136,594,152โˆ’1,182,5376.51
15 Jun 202137,776,689สณโˆ’4,057,3816.18
28 May 202141,834,070โˆ’5,313,6668.45
14 May 202147,147,736โˆ’409,8205.91
30 Apr 202147,557,556โˆ’7,265,4197.20
15 Apr 202154,822,975+151,6599.62
31 Mar 202154,671,316+5,254,2116.94
15 Mar 202149,417,105+85,9266.65
26 Feb 202149,331,179+3,154,2747.54
12 Feb 202146,176,905โˆ’3,649,1769.90
29 Jan 202149,826,081โˆ’1,481,6279.97
15 Jan 202151,307,708+1,027,71312.02
31 Dec 202050,279,995+3,163,79510.45
15 Dec 202047,116,200โˆ’6,718,61511.64
30 Nov 202053,834,815+6,677,52614.30
13 Nov 202047,157,289โˆ’7,506,5198.16
30 Oct 202054,663,808+3,908,82315.20
15 Oct 202050,754,985โˆ’2,014,06317.75
30 Sep 202052,769,048+4,056,67111.34
15 Sep 202048,712,377โˆ’3,014,5229.30
31 Aug 202051,726,899+80,95213.19
14 Aug 202051,645,947โˆ’2,165,51514.09
31 Jul 202053,811,462+1,998,27810.92
15 Jul 202051,813,184โˆ’2,964,41011.28
30 Jun 202054,777,594โˆ’2,149,3037.49
15 Jun 202056,926,897+5,183,3439.36
29 May 202051,743,554โˆ’7,532,9078.75
15 May 202059,276,461สณโˆ’2,532,6908.89
30 Apr 202061,809,151โˆ’2,308,3599.55
15 Apr 202064,117,510โˆ’240,4749.37
31 Mar 202064,357,984+9,656,5256.39
13 Mar 202054,701,459+2,914,8065.77
28 Feb 202051,786,653+3,484,7318.05
14 Feb 202048,301,922โˆ’393,51713.50
31 Jan 202048,695,439+6,84511.27
15 Jan 202048,688,594+7,760,1648.76
31 Dec 201940,928,430โˆ’2,213,49212.24
13 Dec 201943,141,922โˆ’548,6547.74
29 Nov 201943,690,576+67,4597.28
15 Nov 201943,623,117+2,725,84512.04
31 Oct 201940,897,272โˆ’1,196,5559.90
15 Oct 201942,093,827โˆ’520,9077.06
30 Sep 201942,614,734+1,880,3707.78
13 Sep 201940,734,364โˆ’625,4859.63
30 Aug 201941,359,849+33,24510.74
15 Aug 201941,326,604+1,395,6468.87
31 Jul 201939,930,958+519,58210.72
15 Jul 201939,411,376+2,519,23210.98
28 Jun 201936,892,144โˆ’5,681,8757.81
14 Jun 201942,574,019โˆ’2,784,64612.05
31 May 201945,358,665โˆ’1,315,8039.02
15 May 201946,674,468+3,167,3028.27
30 Apr 201943,507,166+4,268,1666.86
15 Apr 201939,239,000โˆ’1,181,5338.88
29 Mar 201940,420,533+820,3397.97
15 Mar 201939,600,194+3,644,3177.35
28 Feb 201935,955,877โˆ’2,967,7668.05
15 Feb 201938,923,643+1,926,42311.96
31 Jan 201936,997,220+3,785,5758.11
15 Jan 201933,211,645+4,5775.35
31 Dec 201833,207,068โˆ’102,3033.62
14 Dec 201833,309,371โˆ’984,4265.53
30 Nov 201834,293,797โˆ’2,371,3175.99
15 Nov 201836,665,114+1,562,8865.99
31 Oct 201835,102,228โˆ’1,116,0783.92
15 Oct 201836,218,306+1,510,9746.21
28 Sep 201834,707,332โˆ’303,31112.43
14 Sep 201835,010,643+20,17113.55
31 Aug 201834,990,472โˆ’2,134,4379.28
15 Aug 201837,124,909+1,898,6608.69
31 Jul 201835,226,249โˆ’2,291,3478.65
13 Jul 201837,517,596สณ+1,577,4929.85
29 Jun 201835,940,104+2,322,7066.69
15 Jun 201833,617,398+2,202,9937.04
31 May 201831,414,405+532,4577.90
15 May 201830,881,948โˆ’638,1327.92
30 Apr 201831,520,080โˆ’1,485,5347.00
13 Apr 201833,005,614+2,640,9055.61
29 Mar 201830,364,709โˆ’891,2805.98
15 Mar 201831,255,989+1,179,5727.85
28 Feb 201830,076,417+1,521,7008.76
15 Feb 201828,554,717+1,476,3784.58
31 Jan 201827,078,339โˆ’1,986,3384.99
12 Jan 201829,064,677+2,033,5145.44
29 Dec 201727,031,163โ€“8.47

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

Questions

Frequently asked questions

What is XBI's short interest?
75,264,165 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, up 807,405 from the previous settlement.
Why is there no percentage for XBI?
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 XBI's days to cover?
9.91 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 funds by shares short and days to cover: most shorted ETFs. Other symbols with counts only: shares short without a percentage. Browse by name: US companies A to Z.