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Stock research / United States / FFIV / Short interest

F5, Inc. short interest

1.1M shares of F5 were sold short at the 15 October 2026 settlement, the fewest at any settlement since 29 Dec 2017, when our record starts. Short sellers would need 2.1 days of normal trading to buy them back.

Shares sold short1.1Mat 15 Oct 2026
Change on the settlement before-14.9%-58% over a year
Days to cover2.09at 513K shares a day
Of shares in issue1.89%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 fewest at any settlement since 29 Dec 2017, when our record starts, and the share price moved -6% 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 20261.1M-14.9%513K2.09
    30 September 20261.3M-6.6%592K2.13
    15 September 20261.4M-13.8%457K2.95
    31 August 20261.6M+26.4%463K3.39
    14 August 20261.2M-12.0%670K1.85
    31 July 20261.4M+8.8%753K1.87
    15 July 20261.3M-17.2%494K2.62
    30 June 20261.6M+13.0%750K2.09
    15 June 20261.4M-10.6%508K2.73
    29 May 20261.5M+6.4%840K1.84
    15 May 20261.5M-7.6%658K2.21
    30 April 20261.6M-9.3%913K1.73
    15 April 20261.7M-10.2%620K2.80
    31 March 20261.9M+3.2%877K2.21
    13 March 20261.9M+2.5%537K3.50
    27 February 20261.8M-12.5%715K2.56
    13 February 20262.1M-9.5%687K3.05
    30 January 20262.3M-23.9%1.4M1.61
    15 January 20263.0M-6.8%874K3.48
    31 December 20253.3M-8.7%1.3M2.51
    15 December 20253.6M+9.5%1.3M2.82
    28 November 20253.3M+24.8%1.4M2.40
    14 November 20252.6M+0.4%1.1M2.36
    31 October 20252.6M+0.9%1.4M1.90
    15 October 20252.6M+39.3%614K4.20
    30 September 20251.9M+4.0%431K4.29
    15 September 20251.8M-7.6%412K4.32
    29 August 20251.9M-2.6%388K4.96
    15 August 20252.0M+13.9%551K3.59
    31 July 20251.7M+3.5%557K3.12
    15 July 20251.7M-9.1%428K3.93
    30 June 20251.8M-1.6%549K3.37
    13 June 20251.9M+3.9%317K5.93
    30 May 20251.8M+9.9%433K4.17
    15 May 20251.6M-2.8%455K3.61
    30 April 20251.7M-0.1%662K2.56
    15 April 20251.7M+29.9%611K2.77
    31 March 20251.3M-12.9%555K2.35
    14 March 20251.5M-2.1%629K2.38
    28 February 20251.5M+1.4%519K2.94
    14 February 20251.5M-18.0%584K2.58
    31 January 20251.8M+12.9%786K2.34
    15 January 20251.6M+4.5%482K3.38
    31 December 20241.6M+5.0%410K3.80
    13 December 20241.5M-31.1%552K2.68
    29 November 20242.2M+2.9%461K4.67
    15 November 20242.1M-9.7%535K3.91
    31 October 20242.3M+9.2%861K2.69
    15 October 20242.1M-4.4%441K4.81
    30 September 20242.2M-2.8%780K2.85
    13 September 20242.3M+14.0%635K3.60
    30 August 20242.0M-8.0%374K5.35
    15 August 20242.2M-12.3%462K4.72
    31 July 20242.5M+0.8%760K3.27
    15 July 20242.5M-7.9%319K7.72
    28 June 20242.7M+11.4%681K3.93
    14 June 20242.4M-19.2%436K5.51
    31 May 20243.0M+22.8%556K5.36
    15 May 20242.4M+25.4%542K4.48
    30 April 20241.9M+3.0%618K3.13
    15 April 20241.9M+10.1%363K5.17
    28 March 20241.7M-6.3%266K6.43
    15 March 20241.8M-1.1%453K4.02
    29 February 20241.8M+11.7%432K4.26
    15 February 20241.6M-1.7%459K3.59
    31 January 20241.7M-10.2%656K2.56
    12 January 20241.9M-9.2%332K5.63
    29 December 20232.1M-9.2%270K7.62
    15 December 20232.3M+44.8%594K3.81
    30 November 20231.6M+19.3%770K2.03
    15 November 20231.3M-5.0%469K2.80
    31 October 20231.4M+0.9%584K2.37
    13 October 20231.4M-0.3%433K3.16
    29 September 20231.4M-6.1%286K4.80
    15 September 20231.5M+10.0%398K3.68
    31 August 20231.3M-11.9%313K4.25
    15 August 20231.5M+0.7%440K3.43
    31 July 20231.5M-14.9%870K1.72
    14 July 20231.8M+0.3%527K3.34
    30 June 20231.8M-13.3%593K2.96
    15 June 20232.0M+2.9%484K4.19
    31 May 20232.0M+4.5%595K3.31
    15 May 20231.9M-0.5%541K3.49
    28 April 20231.9M+2.9%959K1.98
    14 April 20231.8M+2.8%486K3.79
    31 March 20231.8M+3.8%410K4.37
    15 March 20231.7M-2.7%439K3.93
    28 February 20231.8M-2.5%444K4.00
    15 February 20231.8M-3.0%614K2.97
    31 January 20231.9M+13.1%670K2.80
    13 January 20231.7M-2.1%475K3.49
    30 December 20221.7M-11.1%385K4.40
    15 December 20221.9M-0.1%428K4.45
    30 November 20221.9M-9.6%480K3.98
    15 November 20222.1M-6.3%562K3.75
    31 October 20222.3M-6.4%740K3.04
    14 October 20222.4M+9.5%520K4.63
    30 September 20222.2M-10.1%545K4.03
    15 September 20222.4M-8.5%421K5.81
    31 August 20222.7M+9.2%332K8.04
    15 August 20222.4M+4.2%435K5.62
    29 July 20222.3M+7.4%973K2.41
    15 July 20222.2M+10.9%513K4.26
    30 June 20222.0M+9.5%414K4.76
    15 June 20221.8M-4.1%315K5.71
    31 May 20221.9M-6.3%554K3.39
    13 May 20222.0M+5.0%686K2.92
    29 April 20221.9M-8.9%809K2.36
    14 April 20222.1M+0.1%442K4.73
    31 March 20222.1M+1.3%440K4.74
    15 March 20222.1M+6.8%480K4.30
    28 February 20221.9M-8.8%541K3.57
    15 February 20222.1M-9.5%665K3.18
    31 January 20222.3M+19.4%1.5M1.60
    14 January 20222.0M-1.0%369K5.30
    31 December 20212.0M-11.9%409K4.83
    15 December 20212.2M-7.4%442K5.08
    30 November 20212.4M-1.6%457K5.31
    15 November 20212.5M-21.1%443K5.56
    29 October 20213.1M+1.4%541K5.77
    15 October 20213.1M-3.5%273K11.29
    30 September 20213.2M-1.8%377K8.47
    15 September 20213.3M+5.4%458K7.09
    31 August 20213.1M+4.8%324K9.50
    13 August 20212.9M-3.3%418K7.03
    30 July 20213.0M-4.0%622K4.89
    15 July 20213.2M+7.3%374K8.48
    30 June 20213.0M+8.7%483K6.11
    15 June 20212.7M-5.6%500K5.43
    28 May 20212.9M+11.2%464K6.20
    14 May 20212.6M-5.8%502K5.16
    30 April 20212.7M-6.1%772K3.55
    15 April 20212.9M-6.6%524K5.58
    31 March 20213.1M-4.8%603K5.19
    15 March 20213.3M-0.1%511K6.44
    26 February 20213.3M-6.6%876K3.76
    12 February 20213.5M+25.4%554K6.36
    29 January 20212.8M-11.3%1.1M2.56
    15 January 20213.2M-3.6%635K4.99
    31 December 20203.3M+5.6%459K7.16
    15 December 20203.1M-3.5%514K6.05
    30 November 20203.2M-14.9%624K5.17
    13 November 20203.8M-13.1%931K4.07
    30 October 20204.4M+16.6%1.0M4.20
    15 October 20203.7M-3.2%531K7.05
    30 September 20203.9M+5.3%638K6.06
    15 September 20203.7M+3.4%487K7.53
    31 August 20203.5M-1.4%591K6.01
    14 August 20203.6M+7.0%628K5.72
    31 July 20203.4M+6.8%1.1M3.03
    15 July 20203.1M+13.6%746K4.22
    30 June 20202.8M+8.4%849K3.26
    15 June 20202.6M+21.1%560K4.56
    29 May 20202.1M+18.9%630K3.35
    15 May 20201.8M-19.8%740K2.40
    30 April 20202.2M+12.1%1.3M1.70
    15 April 20202.0M-7.2%754K2.62
    31 March 20202.1M-19.4%988K2.15
    13 March 20202.6M+16.4%1.0M2.62
    28 February 20202.3M+8.2%774K2.92
    14 February 20202.1M-17.6%611K3.42
    31 January 20202.5M+36.4%942K2.70
    15 January 20201.9M-6.8%464K4.02
    31 December 20192.0M-5.3%614K3.26
    13 December 20192.1M+11.3%727K2.90
    29 November 20191.9M-7.8%649K2.92
    15 November 20192.1M+5.8%461K4.47
    31 October 20191.9M-8.6%731K2.66
    15 October 20192.1M+3.3%549K3.88
    30 September 20192.1M+2.4%482K4.27
    13 September 20192.0M-16.2%628K3.21
    30 August 20192.4M-12.9%615K3.91
    15 August 20192.8M-15.2%725K3.80
    31 July 20193.2M-1.5%839K3.87
    15 July 20193.3M-1.1%624K5.29
    28 June 20193.3M+14.7%813K4.10
    14 June 20192.9M-12.8%678K4.29
    31 May 20193.3M-19.3%738K4.52
    15 May 20194.1M-12.5%612K6.76
    30 April 20194.7M+2.5%602K7.85
    15 April 20194.6M-2.7%599K7.70
    29 March 20194.7M+1.1%550K8.61
    15 March 20194.7M+1.0%854K5.49
    28 February 20194.6M-3.1%523K8.88
    15 February 20194.8M-4.6%527K9.08
    31 January 20195.0M-8.1%971K5.17
    15 January 20195.5M+12.6%747K7.32
    31 December 20184.9M+2.2%700K6.93
    14 December 20184.7M+3.5%766K6.20
    30 November 20184.6M+1.8%608K7.55
    15 November 20184.5M-6.3%703K6.41
    31 October 20184.8M-8.3%968K4.97
    15 October 20185.2M+21.3%945K5.56
    28 September 20184.3M-3.0%537K8.05
    14 September 20184.5M-9.5%441K10.10
    31 August 20184.9M+2.2%492K10.03
    15 August 20184.8M+10.5%576K8.38
    31 July 20184.4M+6.3%777K5.62
    13 July 20184.1M+7.6%540K7.61
    29 June 20183.8M-9.1%693K5.51
    15 June 20184.2M-1.8%618K6.80
    31 May 20184.3M+9.8%656K6.51
    15 May 20183.9M+5.6%833K4.68
    30 April 20183.7M-13.6%845K4.37
    13 April 20184.3M+12.5%725K5.88
    29 March 20183.8M-1.1%581K6.52
    15 March 20183.8M+6.8%730K5.25
    28 February 20183.6M+5.6%740K4.86
    15 February 20183.4M+13.2%961K3.54
    31 January 20183.0M-13.1%1.1M2.85
    12 January 20183.5M+12.8%580K5.97
    29 December 20173.1M384K7.99
    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.