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F5, Inc.

FFIV
Exchange
Nasdaq
Industry
Computer Communications Equipment
SEC CIK
0001048695

In the last 90 days, F5, Inc. insiders filed 0 open-market purchases and 10 sales; 836 institutions reported holding it in 13F filings for Q2 2026, worth $22.6B in total; superinvestors Duquesne Family Office and Maverick Capital hold it.

Four kinds of short-selling data, each measuring something different:

  • Short interest: shares sold short and not yet bought back, as of a settlement date. FINRA publishes it twice a month, about eight business days after the settlement date.
  • Daily short volume: shares sold short each day in off-exchange trades reported to FINRA. It counts trades, not open positions, and is published the next day.
  • Fails-to-deliver: shares not delivered by the settlement date. The SEC publishes them twice a month, about two weeks late.
  • ATS (dark pool) volume: weekly volume on alternative trading systems and other off-exchange venues. FINRA publishes it two to four weeks after the week.

More in the glossary.

Short interest

Shares sold short and not yet bought back, from FINRA, on every settlement date in the last two years.

Short interest
1.26M
Shares, settlement Oct 30, 2026
Change
+189.2K
+17.6% vs. Oct 15, 2026
Days to cover
1.04
Short interest ÷ average daily volume
Average daily volume
1.22M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 2,317,604 sharesNov 15, 2024: 2,092,666 sharesNov 29, 2024: 2,153,104 sharesDec 13, 2024: 1,482,490 sharesDec 31, 2024: 1,556,901 sharesJan 15, 2025: 1,627,027 sharesJan 31, 2025: 1,836,343 sharesFeb 14, 2025: 1,505,655 sharesFeb 28, 2025: 1,526,661 sharesMar 14, 2025: 1,494,699 sharesMar 31, 2025: 1,302,472 sharesApr 15, 2025: 1,692,093 sharesApr 30, 2025: 1,691,064 sharesMay 15, 2025: 1,643,830 sharesMay 30, 2025: 1,807,080 sharesJun 13, 2025: 1,876,815 sharesJun 30, 2025: 1,846,816 sharesJul 15, 2025: 1,679,199 sharesJul 31, 2025: 1,738,075 sharesAug 15, 2025: 1,979,339 sharesAug 29, 2025: 1,926,995 sharesSep 15, 2025: 1,780,357 sharesSep 30, 2025: 1,850,952 sharesOct 15, 2025: 2,577,457 sharesOct 31, 2025: 2,600,788 sharesNov 14, 2025: 2,611,637 sharesNov 28, 2025: 3,260,584 sharesDec 15, 2025: 3,569,034 sharesDec 31, 2025: 3,259,087 sharesJan 15, 2026: 3,037,580 sharesJan 30, 2026: 2,312,144 sharesFeb 13, 2026: 2,093,014 sharesFeb 27, 2026: 1,830,697 sharesMar 13, 2026: 1,876,519 sharesMar 31, 2026: 1,936,331 sharesApr 15, 2026: 1,738,191 sharesApr 30, 2026: 1,576,004 sharesMay 15, 2026: 1,455,561 sharesMay 29, 2026: 1,549,023 sharesJun 15, 2026: 1,384,552 sharesJun 30, 2026: 1,564,617 sharesJul 15, 2026: 1,295,676 sharesJul 31, 2026: 1,409,686 sharesAug 14, 2026: 1,240,342 sharesAug 31, 2026: 1,567,256 sharesSep 15, 2026: 1,350,380 sharesSep 30, 2026: 1,260,728 sharesOct 15, 2026: 1,073,301 sharesOct 30, 2026: 1,262,477 shares
Short interest in FFIV by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20261.26M+189.2K+17.6%1.22M1.04
Oct 15, 20261.07M−187.4K−14.9%512.9K2.09
Sep 30, 20261.26M−89.7K−6.6%592.3K2.13
Sep 15, 20261.35M−216.9K−13.8%457.2K2.95
Aug 31, 20261.57M+326.9K+26.4%463.0K3.39
Aug 14, 20261.24M−169.3K−12.0%670.3K1.85
Jul 31, 20261.41M+114.0K+8.8%753.3K1.87
Jul 15, 20261.30M−268.9K−17.2%494.1K2.62
Jun 30, 20261.56M+180.1K+13.0%749.6K2.09
Jun 15, 20261.38M−164.5K−10.6%508.0K2.73
May 29, 20261.55M+93.5K+6.4%839.9K1.84
May 15, 20261.46M−120.4K−7.6%657.9K2.21
Apr 30, 20261.58M−162.2K−9.3%913.4K1.73
Apr 15, 20261.74M−198.1K−10.2%619.7K2.80
Mar 31, 20261.94M+59.8K+3.2%876.8K2.21
Mar 13, 20261.88M+45.8K+2.5%536.9K3.50
Feb 27, 20261.83M−262.3K−12.5%715.4K2.56
Feb 13, 20262.09M−219.1K−9.5%686.9K3.05
Jan 30, 20262.31M−725.4K−23.9%1.44M1.61
Jan 15, 20263.04M−221.5K−6.8%873.7K3.48
Dec 31, 20253.26M−309.9K−8.7%1.30M2.51
Dec 15, 20253.57M+308.4K+9.5%1.27M2.82
Nov 28, 20253.26M+648.9K+24.9%1.36M2.40
Nov 14, 20252.61M+10.8K+0.4%1.11M2.36
Oct 31, 20252.60M+23.3K+0.9%1.37M1.90
Oct 15, 20252.58M+726.5K+39.3%613.7K4.20
Sep 30, 20251.85M+70.6K+4.0%431.3K4.29
Sep 15, 20251.78M−146.6K−7.6%412.1K4.32
Aug 29, 20251.93M−52.3K−2.6%388.4K4.96
Aug 15, 20251.98M+241.3K+13.9%551.2K3.59
Jul 31, 20251.74M+58.9K+3.5%556.7K3.12
Jul 15, 20251.68M−167.6K−9.1%427.8K3.93
Jun 30, 20251.85M−30.0K−1.6%548.7K3.37
Jun 13, 20251.88M+69.7K+3.9%316.5K5.93
May 30, 20251.81M+163.3K+9.9%433.2K4.17
May 15, 20251.64M−47.2K−2.8%455.3K3.61
Apr 30, 20251.69M−1.03K−0.1%661.8K2.56
Apr 15, 20251.69M+389.6K+29.9%610.6K2.77
Mar 31, 20251.30M−192.2K−12.9%554.7K2.35
Mar 14, 20251.49M−32.0K−2.1%628.8K2.38
Feb 28, 20251.53M+21.0K+1.4%519.2K2.94
Feb 14, 20251.51M−330.7K−18.0%584.0K2.58
Jan 31, 20251.84M+209.3K+12.9%785.9K2.34
Jan 15, 20251.63M+70.1K+4.5%481.8K3.38
Dec 31, 20241.56M+74.4K+5.0%410.1K3.80
Dec 13, 20241.48M−670.6K−31.2%552.2K2.68
Nov 29, 20242.15M+60.4K+2.9%461.5K4.67
Nov 15, 20242.09M−224.9K−9.7%534.8K3.91
Oct 31, 20242.32M+195.1K+9.2%861.0K2.69

Fails-to-deliver

Shares that weren't delivered by the settlement date, from the SEC, for the last 30 dates with fails. The price is the previous day's closing price published by the SEC.

Fails-to-deliver in FFIV by settlement date
Settlement dateSharesPriceValue
Oct 9, 20261$461.66$461.66
Oct 7, 20262,674$469.79$1.26M
Aug 25, 20261$379.04$379.04
Aug 21, 20262$377.79$755.58
Aug 11, 2026105$409.99$43.0K
Jul 30, 202669$386.95$26.7K
Jul 9, 20265,414$419.14$2.27M
May 26, 2026497$393.63$195.6K
May 21, 202616,352$382.42$6.25M
May 14, 2026404$357.40$144.4K
May 4, 2026545$323.20$176.1K
Apr 30, 202684$328.15$27.6K
Apr 23, 2026273$311.18$85.0K
Apr 20, 2026117$310.87$36.4K
Apr 15, 2026151$295.19$44.6K
Apr 14, 2026149$298.07$44.4K
Apr 13, 2026139$289.81$40.3K
Apr 10, 2026324$294.59$95.4K
Apr 9, 2026381$304.76$116.1K
Mar 26, 2026100$297.86$29.8K
Mar 25, 20267,816$289.04$2.26M
Mar 24, 202640,310$289.75$11.7M
Mar 23, 202640,317$284.28$11.5M
Mar 17, 202620$283.73$5.67K
Mar 12, 20264,071$289.52$1.18M
Mar 5, 20267,117$286.12$2.04M
Mar 4, 202620$281.54$5.63K
Feb 23, 2026117$278.39$32.6K
Feb 18, 20268,274$270.58$2.24M
Feb 12, 202675$282.67$21.2K

Daily short volume

Off-exchange short-sale volume, not short interest: shares sold short each day in trades reported to FINRA, for the last 30 trading days.

The short volume ratio isn't a sentiment gauge: market makers sell short to fill buy orders and to hedge, so short sales are usually about half of off-exchange volume.

Off-exchange short volume in FFIV by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026155,36315247,70362.7%
Nov 9, 2026140,47413314,00144.7%
Nov 6, 2026233,3171,062475,30249.1%
Nov 5, 2026364,264785642,36556.7%
Nov 4, 2026193,56146405,59247.7%
Nov 3, 2026152,500398482,18931.6%
Nov 2, 2026334,92559,045684,53948.9%
Oct 30, 2026317,339241,044,35130.4%
Oct 29, 2026248,48412,407906,69527.4%
Oct 28, 2026997,21172,2241,716,14058.1%
Oct 27, 2026336,9140492,03968.5%
Oct 26, 2026129,627393222,89158.2%
Oct 23, 2026116,84110269,24943.4%
Oct 22, 202672,87490186,74339.0%
Oct 21, 202695,718948352,53827.2%
Oct 20, 202695,7212188,99050.6%
Oct 19, 2026135,1720222,24460.8%
Oct 16, 202674,488405188,46639.5%
Oct 15, 202671,5334,463215,17133.2%
Oct 14, 202698,0521,900199,59849.1%
Oct 13, 2026132,99164256,45951.9%
Oct 12, 202687,2802158,85254.9%
Oct 9, 202661,0811,083215,97628.3%
Oct 8, 202682,5161,189216,08138.2%
Oct 7, 202676,817210130,45458.9%
Oct 6, 202688,03333190,64846.2%
Oct 5, 202660,7399139,58443.5%
Oct 2, 202678,72523193,26340.7%
Oct 1, 2026152,0800245,50261.9%
Sep 30, 202668,6048124,90254.9%

ATS (dark pool) volume

Weekly volume on alternative trading systems (ATS) and other off-exchange (OTC) venues, from FINRA, for the last 12 weeks. ATS share is ATS volume ÷ (ATS + OTC volume), not a share of all trading.

Weekly ATS and OTC volume in FFIV
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 19, 2026T1936,54544,835374,34812,79871.4%
Oct 12, 2026T1780,55043,218320,23515,87170.9%
Oct 5, 2026T1637,94737,979439,54514,55259.2%
Sep 28, 2026T1810,18636,347382,46815,49667.9%
Sep 21, 2026T1788,67735,894344,43718,95569.6%
Sep 14, 2026T1876,79438,932598,68320,51959.4%
Sep 7, 2026T1533,53728,754288,0999,63864.9%
Aug 31, 2026T1549,28532,998387,65113,46758.6%
Aug 24, 2026T1529,24831,734270,68416,62166.2%
Aug 17, 2026T1636,36738,870353,77613,88964.3%
Aug 10, 2026T1835,79339,409354,32212,38370.2%
Aug 3, 2026T11,076,87043,610447,45715,00770.6%