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Firefly Aerospace Inc. short interest

13.5M shares of Firefly Aerospace were sold short at the 15 October 2026 settlement, the most at any settlement since 29 Dec 2017, when our record starts. Short sellers would need 4.0 days of normal trading to buy them back.

Shares sold short13.5Mat 15 Oct 2026
Change on the settlement before+12.9%+546% over a year
Days to cover3.97at 3.4M shares a day
Of shares in issue8.11%shares short over shares outstanding
New to this? How to read this page
  1. Short interest is the number of shares investors have borrowed and sold, betting the price will fall, and not yet bought back.
  2. Days to cover is shares short over an average day's trading: how many days it would take short sellers to buy them all back. Above 5 or so is high.
  3. Rising short interest says more investors are betting against the stock. A crowded short can also rise fast if shorts rush to buy back.
  4. Brokers report it twice a month to FINRA, about ten days after each settlement date.
  5. What is short interest?

Short interest, days to cover and the price

Short interest is the most at any settlement since 29 Dec 2017, when our record starts, and the share price moved -33% over the last year.

Shares sold shortDays to coverShare price

Three charts on one timeline. Top: shares sold short at each settlement. Middle: days to cover, taller meaning shorts would need longer to buy back. Bottom: the share price, so you can see whether shorts added as the price fell or rose.

How it compares

every company on the site

    The bar ranks every company on the site from the lowest on the left to the highest on the right, in three equal thirds; the small figures under it are the values where each third starts, and the black tick is the middle company. The orange dot is this company; the grey ticks are the other companies in its industry (hover or tap for names). A hatched block is companies tied at none.

    Every settlement since 29 Dec 2017 as a table
    SettlementShares shortChangeAverage daily volumeDays to cover
    15 October 202613.5M+12.9%3.4M3.97
    30 September 202611.9M+7.5%3.7M3.22
    15 September 202611.1M+2.6%2.2M5.08
    31 August 202610.8M-2.8%2.4M4.58
    14 August 202611.1M+1.6%3.5M3.21
    31 July 202610.9M-8.4%3.5M3.14
    15 July 202612.0M-9.4%3.4M3.48
    30 June 202613.2M+11.4%7.7M1.72
    15 June 202611.8M+3.7%8.1M1.46
    29 May 202611.4M+23.9%10.8M1.05
    15 May 20269.2M+12.9%7.0M1.32
    30 April 20268.2M-11.1%5.3M1.55
    15 April 20269.2M+17.6%8.6M1.07
    31 March 20267.8M+14.6%6.7M1.16
    13 March 20266.8M+6.0%3.7M1.83
    27 February 20266.4M+18.4%2.3M2.74
    13 February 20265.4M-6.7%3.4M1.61
    30 January 20265.8M+13.5%3.7M1.57
    15 January 20265.1M+8.6%3.7M1.40
    31 December 20254.7M+36.4%3.5M1.34
    15 December 20253.5M+18.0%2.5M1.41
    28 November 20252.9M+10.8%1.9M1.54
    14 November 20252.6M+11.2%2.6M1.04
    31 October 20252.4M+13.9%1.4M1.72
    15 October 20252.1M-0.9%3.1M1.00
    30 September 20252.1M+31.0%2.2M1.00
    15 September 20251.6M+82.9%592K2.72
    29 August 2025879K+7.8%691K1.27
    15 August 2025816K-10.1%4.5M1.00
    30 July 2021907K-3.7%194K4.67
    15 July 2021942K+2.5%222K4.24
    30 June 2021918K-0.5%259K3.54
    15 June 2021923K-0.6%178K5.17
    28 May 2021928K-13.8%149K6.25
    14 May 20211.1M-16.8%214K5.03
    30 April 20211.3M+44.9%383K3.38
    15 April 2021893K+50.7%809K1.10
    31 March 2021593K+78.2%1.3M1.00
    15 March 2021333K+18.4%396K1.00
    26 February 2021281K-11.5%310K1.00
    12 February 2021317K-12.7%176K1.81
    29 January 2021363K+9.6%253K1.44
    15 January 2021332K-11.1%392K1.00
    31 December 2020373K+26.5%769K1.00
    15 December 2020295K-25.9%315K1.00
    30 November 2020398K+20.4%329K1.21
    13 November 2020331K-18.3%393K1.00
    30 October 2020405K+5.9%184K2.20
    15 October 2020382K-28.4%195K1.96
    30 September 2020534K+40.1%364K1.46
    15 September 2020381K+1.7%171K2.23
    31 August 2020375K+26.0%304K1.23
    14 August 2020297K-9.8%417K1.00
    31 July 2020330K+18.0%201K1.64
    15 July 2020280K+7.6%254K1.10
    30 June 2020260K+31.7%335K1.00
    15 June 2020197K+22.1%569K1.00
    29 May 2020162K-0.2%721K1.00
    15 May 2020162K+34.9%419K1.00
    30 April 2020120K-17.7%310K1.00
    15 April 2020146K+75.7%410K1.00
    31 March 202083K-65.2%470K1.00
    13 March 2020238K+5.2%297K1.00
    28 February 2020226K+348.8%189K1.20
    14 February 202050K-18.4%102K1.00
    31 January 202062K+63.5%101K1.00
    15 January 202038K-45.9%91K1.00
    31 December 201970K-18.5%95K1.00
    13 December 201986K-28.9%73K1.18
    29 November 2019121K-7.3%127K1.00
    15 November 2019130K-23.4%274K1.00
    31 October 2019170K-10.8%205K1.00
    15 October 2019190K+5.0%160K1.19
    30 September 2019182K-2.6%211K1.00
    13 September 2019186K+35.2%395K1.00
    30 August 2019138K-12.3%396K1.00
    15 August 2019157K+19.4%101K1.56
    31 July 2019132K-14.9%103K1.28
    15 July 2019155K+39.8%122K1.27
    28 June 2019111K-5.4%324K1.00
    14 June 2019117K-0.4%352K1.00
    31 May 2019117K+10.0%283K1.00
    15 May 2019107K+48.6%153K1.00
    30 April 201972K+12.6%83K1.00
    15 April 201964K-10.5%178K1.00
    29 March 201971K+10.9%79K1.00
    15 March 201964K+41.6%134K1.00
    28 February 201945K-15.5%49K1.00
    15 February 201954K-26.0%73K1.00
    31 January 201973K+13.0%67K1.08
    15 January 201964K-46.9%138K1.00
    31 December 2018121K-12.6%131K1.00
    14 December 2018138K+153.9%111K1.25
    30 November 201855K-15.3%83K1.00
    15 November 201864K-21.2%83K1.00
    31 October 201882K+11.6%58K1.40
    15 October 201873K+12.3%59K1.23
    28 September 201865K-47.0%45K1.45
    14 September 2018123K-0.8%87K1.42
    31 August 2018124K-14.5%155K1.00
    15 August 2018145K-16.1%52K2.79
    31 July 2018173K+20.7%52K3.36
    13 July 2018144K+33.6%59K2.43
    29 June 2018107K+2.5%135K1.00
    15 June 2018105K+36.6%89K1.18
    31 May 201877K-17.5%138K1.00
    15 May 201893K+26.4%181K1.00
    30 April 201874K-28.9%71K1.04
    13 April 2018104K-7.9%76K1.37
    29 March 2018112K-41.4%100K1.13
    15 March 2018192K-9.0%277K1.00
    28 February 2018211K+10.1%74K2.85
    15 February 2018192K+42.3%165K1.17
    31 January 2018135K+8.9%107K1.26
    12 January 2018124K-17.1%167K1.00
    29 December 2017149K99K1.51
    Shares in millions (M) or thousands (K); hold the pointer on a figure for the exact count. FINRA publishes consolidated short interest twice a month, about ten days after each settlement.