MSTZ short interest Cboe BZX
T-Rex 2X Inverse MSTR Daily Ta. 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
- 3,648,624
- vs previous settlement
- −4,787,861 (-56.8%)
- days to cover
- 1.00
- Settlement date
- 15 Sep 2026
Days to cover
FINRA's own figure: reported shares short divided by the security's average daily trading volume, published alongside each settlement.
Fails to deliver
The SEC's fails-to-deliver figure for MSTZ: 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
- 439,953
- 14 Sep 2026
- Highest in window
- 10,417,362
- 4 Sep 2026
- Days with a balance
- 199
- Window
- 16 Sep 2025 to 14 Sep 2026
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 10M shares.
History
Every FINRA settlement we hold for MSTZ, newest first.
| Settlement date | Shares short | Change | Days to cover |
|---|---|---|---|
| 15 Sep 2026 | 3,648,624 | −4,787,861 | 1.00 |
| 31 Aug 2026 | 8,436,485 | +7,167,559 | 1.00 |
| 14 Aug 2026 | 1,268,926 | +106,156 | 1.00 |
| 31 Jul 2026 | 1,162,770 | −60,156 | 1.00 |
| 15 Jul 2026 | 1,222,926 | −59,262 | 1.00 |
| 30 Jun 2026 | 1,282,188 | −3,093,007 | 1.00 |
| 15 Jun 2026 | 4,375,195 | +3,024,563 | 1.00 |
| 29 May 2026 | 1,350,632 | −3,595,364 | 1.00 |
| 15 May 2026 | 4,945,996 | +4,462,233 | 1.00 |
| 30 Apr 2026 | 483,763 | +177,548 | 1.00 |
| 15 Apr 2026 | 306,215 | −421,276 | 1.00 |
| 31 Mar 2026 | 727,491 | −1,185,853 | 1.00 |
| 13 Mar 2026 | 1,913,344 | +320,633 | 1.00 |
| 27 Feb 2026 | 1,592,711 | +260,820 | 1.00 |
| 13 Feb 2026 | 1,331,891 | +77,756 | 1.00 |
| 30 Jan 2026 | 1,254,135 | −1,398,602 | 1.00 |
| 15 Jan 2026 | 2,652,737 | +762,385 | 1.00 |
| 31 Dec 2025 | 1,890,352 | −125,064 | 1.00 |
| 15 Dec 2025 | 2,015,416 | +740,010 | 1.00 |
| 28 Nov 2025 | 1,275,406 | −793,243 | 1.00 |
| 14 Nov 2025 | 2,068,649 | +613,885 | 1.00 |
| 31 Oct 2025 | 1,454,764 | −2,572,725 | 1.00 |
| 15 Oct 2025 | 4,027,489 | −1,815,965 | 1.00 |
| 30 Sep 2025 | 5,843,454 | +1,226,396 | 1.00 |
| 15 Sep 2025 | 4,617,058 | −562,210 | 1.00 |
| 29 Aug 2025 | 5,179,268 | +73,839 | 1.00 |
| 15 Aug 2025 | 5,105,429 | −305,036 | 1.00 |
| 31 Jul 2025 | 5,410,465 | −12,274,576 | 1.00 |
| 15 Jul 2025 | 17,685,041 | +10,664,252 | 1.00 |
| 30 Jun 2025 | 7,020,789 | +4,123,983 | 1.00 |
| 13 Jun 2025 | 2,896,806 | −441,576 | 1.00 |
| 30 May 2025 | 3,338,382 | +764,062 | 1.00 |
| 15 May 2025 | 2,574,320 | +250,878 | 1.00 |
| 30 Apr 2025 | 2,323,442 | +1,600,015 | 1.00 |
| 15 Apr 2025 | 723,427 | +487,472 | 1.00 |
| 31 Mar 2025 | 235,955 | −125,051 | 1.00 |
| 14 Mar 2025 | 361,006 | +164,493 | 1.00 |
| 28 Feb 2025 | 196,513 | −180,357 | 1.00 |
| 14 Feb 2025 | 376,870 | −358,197 | 1.00 |
| 31 Jan 2025 | 735,067 | +113,248 | 1.00 |
| 15 Jan 2025 | 621,819 | +126,121 | 1.00 |
| 31 Dec 2024 | 495,698 | −4,604,033 | 1.00 |
| 13 Dec 2024 | 5,099,731 | −2,227,140 | 1.00 |
| 29 Nov 2024 | 7,326,871 | +4,476,913 | 1.00 |
| 15 Nov 2024 | 2,849,958 | +2,450,241 | 1.00 |
| 31 Oct 2024 | 399,717 | +358,853 | 1.00 |
| 15 Oct 2024 | 40,864 | +38,361 | 1.00 |
| 30 Sep 2024 | 2,503 | – | 1.00 |
Scroll inside the table for earlier settlements, back to 30 Sep 2024.
Questions
Frequently asked questions
- What is MSTZ's short interest?
- 3,648,624 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, down 4,787,861 from the previous settlement.
- Why is there no percentage for MSTZ?
- 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 MSTZ'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.