Skip to content
HowShorted

MZZ short interest NYSE Arca

ProShares UltraShort MidCap400. 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
1,338
vs previous settlement
−773 (-36.6%)
days to cover
1.00
Settlement date
15 Sep 2026

Shares short over time

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

Fails to deliver

The SEC's fails-to-deliver figure for MZZ: 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
68
14 Sep 2026
Highest in window
279,290
12 Aug 2026
Days with a balance
101
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for ProShares UltraShort MidCap400 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 279K shares.

History

Every FINRA settlement we hold for MZZ, newest first.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 20261,338−7731.00
31 Aug 20262,111+3831.00
14 Aug 20261,728−2851.00
31 Jul 20262,013−1,5491.00
15 Jul 20263,562+2,1211.00
30 Jun 20261,441−3231.00
15 Jun 20261,764−12,1551.00
29 May 202613,919+501.46
15 May 202613,869−6,8125.51
30 Apr 202620,681+7,0092.63
15 Apr 202613,672+4,4351.00
31 Mar 20269,237−3,2491.31
13 Mar 202612,486−3,9501.55
27 Feb 202616,436+3,5835.58
13 Feb 202612,853+2,1101.41
30 Jan 202610,743−213.46
15 Jan 202610,764+1137.29
31 Dec 202510,651−3,6116.35
15 Dec 202514,262−68.95
28 Nov 202514,268−1,0152.19
14 Nov 202515,283+2454.19
31 Oct 202515,038+31716.01
15 Oct 202514,721+1825.99
30 Sep 202514,539+1107.19
15 Sep 202514,429−2,16210.20
29 Aug 202516,591−3758.31
15 Aug 202516,966+8,9141.81
31 Jul 20258,052−6553.30
15 Jul 20258,707+3195.72
30 Jun 20258,388−2,4981.74
13 Jun 202510,886−3,4199.40
30 May 202514,305+5,3214.67
15 May 20258,984+1,6723.65
30 Apr 20257,312+7162.20
15 Apr 20256,596+1,5011.00
31 Mar 20255,095+8051.03
14 Mar 20254,290−2,8751.00
28 Feb 20257,165+6511.49
14 Feb 20256,514−4831.00
31 Jan 20256,997+2,1794.72
15 Jan 20254,818+1,8261.00
31 Dec 20242,992−9,4241.00
13 Dec 202412,416−82914.17
29 Nov 202413,245+5,6712.17
15 Nov 20247,574+4,9041.48
31 Oct 20242,670+9064.64
15 Oct 20241,764−3221.00
30 Sep 20242,086−4551.04
13 Sep 20242,541−5581.08
30 Aug 20243,099+971.50
15 Aug 20243,002+6291.00
31 Jul 20242,373+5281.00
15 Jul 20241,845−1,2281.71
28 Jun 20243,073+2,2371.00
14 Jun 2024836−2261.00
31 May 20241,062+4321.16
15 May 2024630−1,2131.00
30 Apr 20241,843−2,1821.00
15 Apr 20244,025+3701.97
28 Mar 20243,655−5841.30
15 Mar 20244,239+1,3153.83
29 Feb 20242,924+392.24
15 Feb 20242,885−6621.00
31 Jan 20243,547−1811.00
12 Jan 20243,728−1,3481.00
29 Dec 20235,076−1,2991.11
15 Dec 20236,375−1,0103.66
30 Nov 20237,385−3,2513.63
15 Nov 202310,636+4,7602.95
31 Oct 20235,876+1911.16
13 Oct 20235,685+1,6341.00
29 Sep 20234,051+3341.93
15 Sep 20233,717+8651.17
31 Aug 20232,852−1,8351.00
15 Aug 20234,687+2,7571.00
31 Jul 20231,930−4361.30
14 Jul 20232,366+161.00
30 Jun 20232,350−29,9281.00
15 Jun 202332,278+2,42322.25
31 May 202329,855−47632.70
15 May 202330,331−94121.95
28 Apr 202331,272−37013.88
14 Apr 202331,642−2,79123.05
31 Mar 202334,433+4,6878.72
15 Mar 202329,746−11,4086.37
28 Feb 202341,154−6,46312.11
15 Feb 202347,617+4,12315.18
31 Jan 202343,494+30,4265.28
13 Jan 202313,068−7,0211.00
30 Dec 202220,089+9,2401.28
15 Dec 202210,849−1,2112.91
30 Nov 202212,060+2,25017.66
15 Nov 20229,810+2,4922.44
31 Oct 20227,318+5,0632.25
14 Oct 20222,255−1,1171.00
30 Sep 20223,372−1,1151.00
15 Sep 20224,487−3,9841.70
31 Aug 20228,471+2,9952.02
15 Aug 20225,476+353.81
29 Jul 20225,441+1,2542.55
15 Jul 20224,187+7261.27
30 Jun 20223,461+1,9431.00
15 Jun 20221,518−1,2631.00
31 May 20222,781−1,2961.00
13 May 20224,077−1731.00
29 Apr 20224,250−1,0361.52
14 Apr 20225,286−2,0162.42
31 Mar 20227,302−9782.29
15 Mar 20228,280+3,3771.80
28 Feb 20224,903−3612.02
15 Feb 20225,264−2,8702.59
31 Jan 20228,134+4331.00
14 Jan 20227,701−1,0523.70
31 Dec 20218,753+6,2241.70
15 Dec 20212,529−1,4951.10
30 Nov 20214,024+3181.00
15 Nov 20213,706+1,0786.26
29 Oct 20212,628−5,2141.98
15 Oct 20217,842+6,9912.94
30 Sep 2021851−5,0781.00
15 Sep 20215,929+9037.20
31 Aug 20215,026−8233.54
13 Aug 20215,849+2124.91
30 Jul 20215,637−1501.12
15 Jul 20215,787−5914.10
30 Jun 20216,378−1,5572.86
15 Jun 20217,935+7,6982.33
28 May 2021237−1,6401.00
14 May 20211,877+1,3811.00
30 Apr 2021496−1,7291.00
15 Apr 20212,225−1,3891.11
31 Mar 20213,614+1,6501.00
15 Mar 20211,964−12,9581.00
26 Feb 202114,922+4,1412.93
12 Feb 202110,781−2,2201.84
29 Jan 202113,001−11,4931.00
15 Jan 202124,494+2,6291.59
31 Dec 202021,865+6443.40
15 Dec 202021,221−1,4523.35
30 Nov 202022,673+11,6751.48
13 Nov 202010,998+2,4411.00
30 Oct 20208,557+3,7121.00
15 Oct 20204,845+4,5451.00
30 Sep 2020300−5,0101.00
15 Sep 20205,310−7,5111.00
31 Aug 202012,821+5,4462.31
14 Aug 20207,375+3561.00
31 Jul 20207,019−4,1441.00
15 Jul 202011,163−15,2031.00
30 Jun 202026,366−1101.00
15 Jun 202026,476+5,8991.00
29 May 202020,577−28,5281.00
15 May 202049,105+16,8381.00
30 Apr 202032,267−2,6541.00
15 Apr 202034,921+8,6371.08
31 Mar 202026,284+13,1121.00
13 Mar 202013,172−9,4131.00
28 Feb 202022,585+4,1291.00
14 Feb 202018,456−3,1512.35
31 Jan 202021,607+4,5592.92
15 Jan 202017,048+1,0842.53
31 Dec 201915,964+1,2855.62
13 Dec 201914,679+1,1824.05
29 Nov 201913,497+2,4971.55
15 Nov 201911,000+5,2032.96
31 Oct 20195,797−6,5591.62
15 Oct 201912,356−2,3421.74
30 Sep 201914,698+4,4751.83
13 Sep 201910,223−6,9871.25
30 Aug 201917,210−1173.66
15 Aug 201917,327−2,5251.42
31 Jul 201919,852+5,2727.82
15 Jul 201914,580−4,8185.65
28 Jun 201919,398+4,5396.09
14 Jun 201914,859−10,5953.24
31 May 201925,454+12,0363.32
15 May 201913,418+4504.99
30 Apr 201912,968+3,8293.71
15 Apr 20199,139−1,6531.53
29 Mar 201910,792+3,3741.47
15 Mar 20197,418+6261.23
28 Feb 20196,792+1,3352.78
15 Feb 20195,457−7412.12
31 Jan 20196,198+1551.57
15 Jan 20196,043−7,9421.00
31 Dec 201813,985+9,9531.00
14 Dec 20184,032+2,3251.00
30 Nov 20181,707−1,0141.00
15 Nov 20182,721−19,1531.00
31 Oct 201821,874+16,9401.47
15 Oct 20184,934−1,5621.00
28 Sep 20186,496−1,5333.30
14 Sep 20188,029+7985.92
31 Aug 20187,231−3972.71
15 Aug 20187,628+1,3952.80
31 Jul 20186,233+1,1692.68
13 Jul 20185,064+4543.75
29 Jun 20184,610+2,0933.58
15 Jun 20182,517−364.52
31 May 20182,553−3,2891.85
15 May 20185,842−2752.45
30 Apr 20186,117+2,1502.61
13 Apr 20183,967+521.28
29 Mar 20183,915−6,5071.00
15 Mar 201810,422+6,5802.78
28 Feb 20183,842−10,2971.58
15 Feb 201814,139+10,8211.00
31 Jan 20183,318+8001.40
12 Jan 20182,518−1,6751.52
29 Dec 20174,193–1.63

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

Questions

Frequently asked questions

What is MZZ's short interest?
1,338 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, down 773 from the previous settlement.
Why is there no percentage for MZZ?
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 MZZ's days to cover?
1.00 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.