Computer Communications Equipment

Cisco Systems Inc. Common Stock (DE) vs F5 Inc.

WatchlistCSCO / FFIVPrices through Oct 22, 2026

Why these are rivals: #1 and #3 by market value ($420B vs $26B) in Nasdaq's "Computer Communications Equipment" industry; SEC SIC 3576 / 3576 (same major group); #1 and #3 by market value ($420B vs $26B) with SEC SIC 3576 (Computer Communications Equipment).

Rivals, but right now the price gap does not have a measured habit of closing, so there is no paper idea, whatever the gap.

  • Co-movement: daily return correlation, 252 sessions: 0.43 (needs >= 0.60)
  • Mean reversion: ADF t-statistic of the spread: -2.59 (needs <= -2.873 (5% critical value))
Business leadership

CSCO is the larger business

Annual revenue reported to the SEC. Scale, not market share.

YearCSCOFFIVLarger
2025$56.7B$3.1BCSCO
2024$53.8B$2.8BCSCO
2023$57.0B$2.8BCSCO
2022$51.6B$2.7BCSCO
2021$49.8B$2.6BCSCO
2020$49.3B$2.4BCSCO

CSCO led in every year with figures for both. Market value: CSCO $419.9B, FFIV $25.5B.

Stock leadership

FFIV is ahead now

Measured against the pair's own last 252 trading days.

FFIV leads CSCO by 2.45 standard deviations: +21.6% over its usual price ratio. 1 lead switch in the last year.

Price change3 mo6 mo12 mo
CSCO-8.1%+18.4%+48.3%
FFIV+14.8%+50.1%+50.4%
Relationship

Not a measured twin today

Only these tests can make a pair tradable on paper.

Pass
Aligned sessions: 2521 (needs >= 254)
Fail
Co-movement: daily return correlation, 252 sessions: 0.43 (needs >= 0.60)
Fail
Mean reversion: ADF t-statistic of the spread: -2.59 (needs <= -2.873 (5% critical value))
Pass
Speed: half-life of the spread, sessions: 15.65 (needs <= 63)
Data
Both stocks current
The twins over two years

Prices side by side, and the gap between them

CSCO Cisco Systems Inc. Common Stock (DE) FFIV F5 Inc.Price index, 100 = 2024-10-18. Tint = which stock is ahead of the pair's usual 1-year relationship (z beyond +/-0.5).
100150200Oct 2024Oct 2025Oct 2026CSCO 185FFIV 207
Spread z-score: CSCO relative to FFIV, against the 252 sessions before each day. Above 0: CSCO ahead; below 0: FFIV ahead. Lines at +/-2 (idea) and +/-4 (stop).
-4stop-2idea0+2idea+4stopOct 2024Oct 2025Oct 2026
Data table (504 sessions)
DateCSCO indexFFIV indexzAhead
2026-10-22184.80206.95-2.45FFIV ahead
2026-10-21188.97210.87-2.41FFIV ahead
2026-10-20188.00210.00-2.43FFIV ahead
2026-10-19187.63207.28-2.28FFIV ahead
2026-10-16189.20203.25-1.89FFIV ahead
2026-10-15193.53209.94-1.94FFIV ahead
2026-10-14200.21210.25-1.50FFIV ahead
2026-10-13202.73218.98-1.78FFIV ahead
2026-10-12203.21217.72-1.65FFIV ahead
2026-10-09208.58220.63-1.47FFIV ahead
2026-10-08202.41212.28-1.34FFIV ahead
2026-10-07206.82214.57-1.20FFIV ahead
2026-10-06207.79216.02-1.19FFIV ahead
2026-10-05198.77210.84-1.37FFIV ahead
2026-10-02197.67208.77-1.30FFIV ahead
2026-10-01191.61204.01-1.36FFIV ahead
2026-09-30189.62204.70-1.47FFIV ahead
2026-09-29188.41201.43-1.35FFIV ahead
2026-09-28188.05200.28-1.29FFIV ahead
2026-09-25187.98203.72-1.44FFIV ahead
2026-09-24188.46205.33-1.47FFIV ahead
2026-09-23187.51209.67-1.69FFIV ahead
2026-09-22187.53208.45-1.61FFIV ahead
2026-09-21196.37206.96-1.10FFIV ahead
2026-09-18192.94198.65-0.87FFIV ahead
2026-09-17194.22199.84-0.85FFIV ahead
2026-09-16189.82194.77-0.81FFIV ahead
2026-09-15193.92198.12-0.75FFIV ahead
2026-09-14193.90189.21-0.34near the usual relationship
2026-09-11197.55189.31-0.18near the usual relationship
2026-09-10189.29183.23-0.25near the usual relationship
2026-09-09192.79186.05-0.22near the usual relationship
2026-09-08192.34179.15+0.08near the usual relationship
2026-09-04192.39179.54+0.07near the usual relationship
2026-09-03191.35180.32+0.00near the usual relationship
2026-09-02192.84179.82+0.09near the usual relationship
2026-09-01193.34181.96+0.03near the usual relationship
2026-08-31194.66187.20-0.13near the usual relationship
2026-08-28193.68181.28+0.09near the usual relationship
2026-08-27197.59188.62-0.06near the usual relationship
2026-08-26197.96183.74+0.16near the usual relationship
2026-08-25195.75175.99+0.41near the usual relationship
2026-08-24194.20174.29+0.43near the usual relationship
2026-08-21195.63176.86+0.39near the usual relationship
2026-08-20193.08173.71+0.43near the usual relationship
2026-08-19194.77175.94+0.40near the usual relationship
2026-08-18196.63180.99+0.27near the usual relationship
2026-08-17198.91181.87+0.33near the usual relationship
2026-08-14196.76185.40+0.11near the usual relationship
2026-08-13199.91191.28+0.01near the usual relationship
2026-08-12218.25194.48+0.53CSCO ahead
2026-08-11212.17190.36+0.49near the usual relationship
2026-08-10215.94188.52+0.69CSCO ahead
2026-08-07213.94184.03+0.80CSCO ahead
2026-08-06212.97189.93+0.55CSCO ahead
2026-08-05214.06189.13+0.62CSCO ahead
2026-08-04214.48189.56+0.63CSCO ahead
2026-08-03204.12186.84+0.39near the usual relationship
2026-07-31204.35185.11+0.46near the usual relationship
2026-07-30200.07178.75+0.57CSCO ahead
2026-07-29198.17177.92+0.54CSCO ahead
2026-07-28203.63185.52+0.44near the usual relationship
2026-07-27201.85187.59+0.31near the usual relationship
2026-07-24201.15180.34+0.56CSCO ahead
2026-07-23198.66178.44+0.55CSCO ahead
2026-07-22197.69184.21+0.31near the usual relationship
2026-07-21197.64187.94+0.17near the usual relationship
2026-07-20195.03189.41+0.03near the usual relationship
2026-07-17197.22188.11+0.16near the usual relationship
2026-07-16193.20185.49+0.12near the usual relationship
2026-07-15196.92193.80-0.04near the usual relationship
2026-07-14206.29198.30+0.12near the usual relationship
2026-07-13210.10193.56+0.41near the usual relationship
2026-07-10213.72197.90+0.38near the usual relationship
2026-07-09208.44197.87+0.22near the usual relationship
2026-07-08200.53192.73+0.14near the usual relationship
2026-07-07196.95191.79+0.06near the usual relationship
2026-07-06200.81192.68+0.16near the usual relationship
2026-07-02198.54187.67+0.26near the usual relationship
2026-07-01206.15195.04+0.26near the usual relationship
2026-06-30206.94191.26+0.42near the usual relationship
2026-06-29207.36188.78+0.53CSCO ahead
2026-06-26200.44181.41+0.57CSCO ahead
2026-06-25209.60177.49+1.02CSCO ahead
2026-06-24210.94176.93+1.10CSCO ahead
2026-06-23213.44179.11+1.10CSCO ahead
2026-06-22214.11179.91+1.10CSCO ahead
2026-06-18210.61177.25+1.10CSCO ahead
2026-06-17206.71176.97+0.99CSCO ahead
2026-06-16210.66178.80+1.06CSCO ahead
2026-06-15211.72182.46+0.96CSCO ahead
2026-06-12213.35182.16+1.04CSCO ahead
2026-06-11214.64181.09+1.12CSCO ahead
2026-06-10209.30179.68+1.02CSCO ahead
2026-06-09212.05181.73+1.04CSCO ahead
2026-06-08218.73182.17+1.24CSCO ahead
2026-06-05214.31180.87+1.16CSCO ahead
2026-06-04229.03187.91+1.36CSCO ahead
2026-06-03222.87186.53+1.23CSCO ahead
2026-06-02225.51188.12+1.27CSCO ahead
2026-06-01213.76181.91+1.14CSCO ahead
2026-05-29212.16176.32+1.31CSCO ahead
2026-05-28209.02176.31+1.22CSCO ahead
2026-05-27210.84178.48+1.21CSCO ahead
2026-05-26208.47182.55+0.99CSCO ahead
2026-05-22212.14181.00+1.17CSCO ahead
2026-05-21208.25176.43+1.23CSCO ahead
2026-05-20201.46175.84+1.04CSCO ahead
2026-05-19203.28176.34+1.09CSCO ahead
2026-05-18209.44174.61+1.37CSCO ahead
2026-05-15208.26166.72+1.66CSCO ahead
2026-05-14203.54167.64+1.48CSCO ahead
2026-05-13179.47164.34+0.76CSCO ahead
2026-05-12174.93163.22+0.64CSCO ahead
2026-05-11173.93164.75+0.54CSCO ahead
2026-05-08170.14162.79+0.48near the usual relationship
2026-05-07162.37158.64+0.34near the usual relationship
2026-05-06161.45156.81+0.39near the usual relationship
2026-05-05166.14156.29+0.61CSCO ahead
2026-05-04163.20151.71+0.70CSCO ahead
2026-05-01161.82148.61+0.78CSCO ahead
2026-04-30161.21148.93+0.75CSCO ahead
2026-04-29157.80150.89+0.53CSCO ahead
2026-04-28153.03139.69+0.84CSCO ahead
2026-04-27155.50136.90+1.09CSCO ahead
2026-04-24156.82139.40+1.04CSCO ahead
2026-04-23156.08137.89+1.09CSCO ahead
2026-04-22158.21143.08+0.94CSCO ahead
2026-04-21158.03145.10+0.84CSCO ahead
2026-04-20154.53144.38+0.73CSCO ahead
2026-04-17151.96142.94+0.69CSCO ahead
2026-04-16148.87141.65+0.62CSCO ahead
2026-04-15145.10137.53+0.66CSCO ahead
2026-04-14145.54135.73+0.77CSCO ahead
2026-04-13145.08137.06+0.69CSCO ahead
2026-04-10144.86133.26+0.87CSCO ahead
2026-04-09146.53135.46+0.85CSCO ahead
2026-04-08147.46140.13+0.67CSCO ahead
2026-04-07142.14142.13+0.33near the usual relationship
2026-04-06141.71141.46+0.35near the usual relationship
2026-04-02139.22139.48+0.32near the usual relationship
2026-04-01137.30135.94+0.41near the usual relationship
2026-03-31136.70133.04+0.53CSCO ahead
2026-03-30135.73128.62+0.71CSCO ahead
2026-03-27140.80129.66+0.91CSCO ahead
2026-03-26144.75134.79+0.84CSCO ahead
2026-03-25144.17136.96+0.71CSCO ahead
2026-03-24142.46132.90+0.84CSCO ahead
2026-03-23138.87133.23+0.66CSCO ahead
2026-03-20136.80130.72+0.69CSCO ahead
2026-03-19138.32133.48+0.63CSCO ahead
2026-03-18136.72129.76+0.74CSCO ahead
2026-03-17139.66131.52+0.80CSCO ahead
2026-03-16139.01130.46+0.83CSCO ahead
2026-03-13138.00133.03+0.66CSCO ahead
2026-03-12136.96129.98+0.77CSCO ahead
2026-03-11137.60133.12+0.64CSCO ahead
2026-03-10136.89131.57+0.69CSCO ahead
2026-03-09134.27131.20+0.58CSCO ahead
2026-03-06138.55131.61+0.78CSCO ahead
2026-03-05140.96130.42+0.96CSCO ahead
2026-03-04142.48131.56+0.98CSCO ahead
2026-03-03139.11129.46+0.94CSCO ahead
2026-03-02139.92127.83+1.07CSCO ahead
2026-02-27139.99124.77+1.25CSCO ahead
2026-02-26137.60127.61+0.99CSCO ahead
2026-02-25139.39128.08+1.06CSCO ahead
2026-02-24137.67125.08+1.14CSCO ahead
2026-02-23136.96123.93+1.18CSCO ahead
2026-02-20139.53128.01+1.10CSCO ahead
2026-02-19138.41128.38+1.03CSCO ahead
2026-02-18137.74127.69+1.04CSCO ahead
2026-02-17135.39124.42+1.11CSCO ahead
2026-02-13135.39125.96+1.03CSCO ahead
2026-02-12132.14120.48+1.18CSCO ahead
2026-02-11150.70129.98+1.57CSCO ahead
2026-02-10152.03129.84+1.65CSCO ahead
2026-02-09152.89128.17+1.80CSCO ahead
2026-02-06149.44127.17+1.71CSCO ahead
2026-02-05145.10124.71+1.66CSCO ahead
2026-02-04142.99127.13+1.44CSCO ahead
2026-02-03146.42126.28+1.67CSCO ahead
2026-02-02142.07129.08+1.32CSCO ahead
2026-01-30137.98126.73+1.25CSCO ahead
2026-01-29138.18129.91+1.10CSCO ahead
2026-01-28139.11134.40+0.92CSCO ahead
2026-01-27138.62124.35+1.44CSCO ahead
2026-01-26135.68122.98+1.38CSCO ahead
2026-01-23131.41119.21+1.39CSCO ahead
2026-01-22130.95120.47+1.30CSCO ahead
2026-01-21129.83120.26+1.26CSCO ahead
2026-01-20129.23119.41+1.29CSCO ahead
2026-01-16132.47123.33+1.25CSCO ahead
2026-01-15132.58125.98+1.11CSCO ahead
2026-01-14131.10122.98+1.21CSCO ahead
2026-01-13132.96124.06+1.26CSCO ahead
2026-01-12130.39124.41+1.10CSCO ahead
2026-01-09130.16123.83+1.13CSCO ahead
2026-01-08130.30123.88+1.15CSCO ahead
2026-01-07131.64123.19+1.27CSCO ahead
2026-01-06132.54124.44+1.25CSCO ahead
2026-01-05133.16125.10+1.26CSCO ahead
2026-01-02133.97118.00+1.75CSCO ahead
2025-12-31135.71117.37+1.90CSCO ahead
2025-12-30136.38119.26+1.84CSCO ahead
2025-12-29137.05119.29+1.90CSCO ahead
2025-12-26137.70121.00+1.84CSCO ahead
2025-12-24137.46120.62+1.87CSCO ahead
2025-12-23137.46119.76+1.95CSCO ahead
2025-12-22137.61119.74+1.99CSCO ahead
2025-12-19138.16118.13+2.15CSCO ahead
2025-12-18135.57119.14+1.96CSCO ahead
2025-12-17133.90117.74+1.98CSCO ahead
2025-12-16136.63118.75+2.10CSCO ahead
2025-12-15137.86120.94+2.05CSCO ahead
2025-12-12137.07120.78+2.04CSCO ahead
2025-12-11139.66121.60+2.16CSCO ahead
2025-12-10141.38118.67+2.50CSCO ahead
2025-12-09140.08118.62+2.47CSCO ahead
2025-12-08138.94114.13+2.77CSCO ahead
2025-12-05137.37114.09+2.73CSCO ahead
2025-12-04137.00111.89+2.93CSCO ahead
2025-12-03136.98110.64+3.10CSCO ahead
2025-12-02135.43109.67+3.15CSCO ahead
2025-12-01133.97109.70+3.11CSCO ahead
2025-11-28135.55109.97+3.28CSCO ahead
2025-11-26134.02109.54+3.29CSCO ahead
2025-11-25134.46110.36+3.33CSCO ahead
2025-11-24134.32108.58+3.57CSCO ahead
2025-11-21134.07107.73+3.75CSCO ahead
2025-11-20132.91103.84+4.19CSCO ahead
2025-11-19138.11102.99+4.92CSCO ahead
2025-11-18136.31104.40+4.85CSCO ahead
2025-11-17137.03105.13+5.08CSCO ahead
2025-11-14137.42107.60+5.08CSCO ahead
2025-11-13136.33109.84+4.94CSCO ahead
2025-11-12130.30110.43+4.42CSCO ahead
2025-11-11126.34109.67+4.24CSCO ahead
2025-11-10127.01110.71+4.33CSCO ahead
2025-11-07125.21112.99+3.93CSCO ahead
2025-11-06125.16114.07+3.89CSCO ahead
2025-11-05127.03113.34+4.39CSCO ahead
2025-11-04127.41110.99+5.03CSCO ahead
2025-11-03131.17114.51+5.27CSCO ahead
2025-10-31128.81116.36+4.88CSCO ahead
2025-10-30128.45118.03+4.71CSCO ahead
2025-10-29125.67118.98+4.21CSCO ahead
2025-10-28127.94123.04+3.94CSCO ahead
2025-10-27125.78133.53+1.93CSCO ahead
2025-10-24124.44137.18+1.16CSCO ahead
2025-10-23123.80138.80+0.81CSCO ahead
2025-10-22124.49136.95+1.15CSCO ahead
2025-10-21124.59137.58+1.06CSCO ahead
2025-10-20124.47136.33+1.18CSCO ahead
2025-10-17123.56138.36+0.77CSCO ahead
2025-10-16121.72135.81+0.83CSCO ahead
2025-10-15122.48152.08-1.12FFIV ahead
2025-10-14120.97157.79-2.04FFIV ahead
2025-10-13118.85156.63-2.25FFIV ahead
2025-10-10119.70152.54-1.66FFIV ahead
2025-10-09123.26157.42-1.71FFIV ahead
2025-10-08123.91157.52-1.64FFIV ahead
2025-10-07121.54152.09-1.36FFIV ahead
2025-10-06121.41151.28-1.29FFIV ahead
2025-10-03119.66149.43-1.34FFIV ahead
2025-10-02120.35150.44-1.37FFIV ahead
2025-10-01121.12150.49-1.27FFIV ahead
2025-09-30120.54148.61-1.14FFIV ahead
2025-09-29119.31148.36-1.31FFIV ahead
2025-09-26118.43149.38-1.59FFIV ahead
2025-09-25119.54148.98-1.37FFIV ahead
2025-09-24118.60149.20-1.56FFIV ahead
2025-09-23118.99149.30-1.53FFIV ahead
2025-09-22119.36151.83-1.80FFIV ahead
2025-09-19120.17151.14-1.61FFIV ahead
2025-09-18121.00152.57-1.67FFIV ahead
2025-09-17119.31148.89-1.49FFIV ahead
2025-09-16117.92148.86-1.72FFIV ahead
2025-09-15118.08149.03-1.74FFIV ahead
2025-09-12117.21147.91-1.75FFIV ahead
2025-09-11119.26153.85-2.20FFIV ahead
2025-09-10120.03150.22-1.63FFIV ahead
2025-09-09118.64149.63-1.79FFIV ahead
2025-09-08117.83147.43-1.65FFIV ahead
2025-09-05117.86145.25-1.37FFIV ahead
2025-09-04119.79144.54-0.97FFIV ahead
2025-09-03119.22142.10-0.74FFIV ahead
2025-09-02119.45141.04-0.57FFIV ahead
2025-08-29121.72143.99-0.61FFIV ahead
2025-08-28122.32146.40-0.83FFIV ahead
2025-08-27120.58146.10-1.07FFIV ahead
2025-08-26120.49145.10-0.96FFIV ahead
2025-08-25118.29145.16-1.32FFIV ahead
2025-08-22118.60145.87-1.36FFIV ahead
2025-08-21118.08144.49-1.28FFIV ahead
2025-08-20118.23145.20-1.35FFIV ahead
2025-08-19117.62145.06-1.44FFIV ahead
2025-08-18117.95145.42-1.45FFIV ahead
2025-08-15116.63145.00-1.62FFIV ahead
2025-08-14122.09146.45-0.97FFIV ahead
2025-08-13124.03149.80-1.10FFIV ahead
2025-08-12125.76150.11-0.90FFIV ahead
2025-08-11124.51146.27-0.61FFIV ahead
2025-08-08126.48147.95-0.54FFIV ahead
2025-08-07123.15145.87-0.77FFIV ahead
2025-08-06121.93147.71-1.19FFIV ahead
2025-08-05118.96146.58-1.52FFIV ahead
2025-08-04120.67147.60-1.39FFIV ahead
2025-08-01118.23141.36-0.98FFIV ahead
2025-07-31119.94144.11-1.07FFIV ahead
2025-07-30120.29137.48-0.17near the usual relationship
2025-07-29119.73137.59-0.28near the usual relationship
2025-07-28119.66138.69-0.44near the usual relationship
2025-07-25121.02137.65-0.12near the usual relationship
2025-07-24120.31138.83-0.37near the usual relationship
2025-07-23120.89138.23-0.23near the usual relationship
2025-07-22120.08136.94-0.19near the usual relationship
2025-07-21120.40138.00-0.28near the usual relationship
2025-07-18119.89138.94-0.47near the usual relationship
2025-07-17120.33138.10-0.32near the usual relationship
2025-07-16118.69134.78-0.15near the usual relationship
2025-07-15118.36133.70-0.08near the usual relationship
2025-07-14119.49135.25-0.12near the usual relationship
2025-07-11119.71134.21+0.02near the usual relationship
2025-07-10121.14137.89-0.22near the usual relationship
2025-07-09122.04138.99-0.24near the usual relationship
2025-07-08120.84139.05-0.40near the usual relationship
2025-07-07121.44137.60-0.18near the usual relationship
2025-07-03122.22138.00-0.14near the usual relationship
2025-07-02120.84136.16-0.11near the usual relationship
2025-07-01121.74136.09-0.01near the usual relationship
2025-06-30122.23135.33+0.12near the usual relationship
2025-06-27120.95135.99-0.11near the usual relationship
2025-06-26121.48132.93+0.25near the usual relationship
2025-06-25120.14135.37-0.15near the usual relationship
2025-06-24119.61136.06-0.29near the usual relationship
2025-06-23118.71135.69-0.36near the usual relationship
2025-06-20116.84132.03-0.21near the usual relationship
2025-06-18116.00131.73-0.29near the usual relationship
2025-06-17115.10132.70-0.49near the usual relationship
2025-06-16115.42133.50-0.54FFIV ahead
2025-06-13112.91131.79-0.66FFIV ahead
2025-06-12114.69134.11-0.69FFIV ahead
2025-06-11113.09134.67-0.93FFIV ahead
2025-06-10114.78135.03-0.78FFIV ahead
2025-06-09116.10135.52-0.69FFIV ahead
2025-06-06116.38135.84-0.69FFIV ahead
2025-06-05113.85135.17-0.91FFIV ahead
2025-06-04113.44135.11-0.96FFIV ahead
2025-06-03113.39133.64-0.83FFIV ahead
2025-06-02112.49131.52-0.74FFIV ahead
2025-05-30111.06131.22-0.88FFIV ahead
2025-05-29111.08129.02-0.68FFIV ahead
2025-05-28111.59130.26-0.74FFIV ahead
2025-05-27112.32131.78-0.81FFIV ahead
2025-05-23111.19129.71-0.75FFIV ahead
2025-05-22111.63130.81-0.81FFIV ahead
2025-05-21111.35131.63-0.92FFIV ahead
2025-05-20111.73131.92-0.91FFIV ahead
2025-05-19112.61131.37-0.77FFIV ahead
2025-05-16112.09131.01-0.80FFIV ahead
2025-05-15113.21129.98-0.60FFIV ahead
2025-05-14107.98129.48-1.11FFIV ahead
2025-05-13108.84130.23-1.09FFIV ahead
2025-05-12108.65128.91-1.00FFIV ahead
2025-05-09105.30124.18-0.94FFIV ahead
2025-05-08105.20125.59-1.08FFIV ahead
2025-05-07104.95122.99-0.88FFIV ahead
2025-05-06104.33121.77-0.84FFIV ahead
2025-05-05104.51122.86-0.93FFIV ahead
2025-05-02104.53123.60-1.00FFIV ahead
2025-05-01102.40122.20-1.11FFIV ahead
2025-04-30101.71121.73-1.15FFIV ahead
2025-04-29101.02120.80-1.15FFIV ahead
2025-04-28100.14121.88-1.36FFIV ahead
2025-04-2599.91124.16-1.61FFIV ahead
2025-04-2499.17123.30-1.63FFIV ahead
2025-04-2398.01120.68-1.53FFIV ahead
2025-04-2296.97117.15-1.33FFIV ahead
2025-04-2195.79115.32-1.30FFIV ahead
2025-04-1798.24118.91-1.37FFIV ahead
2025-04-1698.24119.08-1.40FFIV ahead
2025-04-15100.78121.17-1.32FFIV ahead
2025-04-14101.15120.79-1.26FFIV ahead
2025-04-11101.00120.32-1.24FFIV ahead
2025-04-1099.70117.25-1.10FFIV ahead
2025-04-09102.41121.45-1.21FFIV ahead
2025-04-0893.71111.06-1.21FFIV ahead
2025-04-0795.86111.96-1.05FFIV ahead
2025-04-0496.09110.01-0.83FFIV ahead
2025-04-03100.97115.40-0.81FFIV ahead
2025-04-02108.91125.40-0.90FFIV ahead
2025-04-01108.88123.50-0.74FFIV ahead
2025-03-31108.72122.43-0.66FFIV ahead
2025-03-28107.22121.34-0.72FFIV ahead
2025-03-27108.17124.19-0.89FFIV ahead
2025-03-26108.88125.46-0.94FFIV ahead
2025-03-25107.45126.47-1.20FFIV ahead
2025-03-24107.42126.13-1.18FFIV ahead
2025-03-21106.24123.41-1.06FFIV ahead
2025-03-20106.80123.45-1.01FFIV ahead
2025-03-19107.68124.25-1.00FFIV ahead
2025-03-18106.24121.77-0.93FFIV ahead
2025-03-17107.28122.98-0.94FFIV ahead
2025-03-14106.59120.68-0.80FFIV ahead
2025-03-13105.13118.36-0.74FFIV ahead
2025-03-12106.52122.34-0.98FFIV ahead
2025-03-11106.89121.99-0.91FFIV ahead
2025-03-10109.34122.54-0.71FFIV ahead
2025-03-07112.65126.74-0.76FFIV ahead
2025-03-06111.72126.80-0.87FFIV ahead
2025-03-05112.68130.00-1.06FFIV ahead
2025-03-04111.45128.80-1.09FFIV ahead
2025-03-03111.84130.66-1.23FFIV ahead
2025-02-28112.95134.46-1.46FFIV ahead
2025-02-27112.42133.79-1.47FFIV ahead
2025-02-26112.90135.56-1.59FFIV ahead
2025-02-25113.23134.72-1.50FFIV ahead
2025-02-24111.42134.82-1.72FFIV ahead
2025-02-21112.72135.90-1.69FFIV ahead
2025-02-20113.94140.06-1.95FFIV ahead
2025-02-19114.24142.58-2.16FFIV ahead
2025-02-18113.79141.43-2.13FFIV ahead
2025-02-14114.29142.62-2.21FFIV ahead
2025-02-13112.47142.75-2.46FFIV ahead
2025-02-12110.17142.82-2.78FFIV ahead
2025-02-11109.99141.80-2.76FFIV ahead
2025-02-10110.66141.78-2.73FFIV ahead
2025-02-07109.71140.98-2.82FFIV ahead
2025-02-06109.71141.36-2.91FFIV ahead
2025-02-05110.24139.47-2.71FFIV ahead
2025-02-04108.07137.84-2.88FFIV ahead
2025-02-03107.54135.73-2.79FFIV ahead
2025-01-31106.77136.68-3.04FFIV ahead
2025-01-30106.54138.62-3.35FFIV ahead
2025-01-29104.92138.16-3.61FFIV ahead
2025-01-28104.70124.02-2.09FFIV ahead
2025-01-27104.09120.94-1.82FFIV ahead
2025-01-24109.64125.52-1.62FFIV ahead
2025-01-23109.64125.49-1.62FFIV ahead
2025-01-22108.58125.11-1.74FFIV ahead
2025-01-21107.52123.11-1.66FFIV ahead
2025-01-17106.11121.37-1.66FFIV ahead
2025-01-16105.39121.33-1.77FFIV ahead
2025-01-15105.67120.61-1.65FFIV ahead
2025-01-14104.53118.68-1.59FFIV ahead
2025-01-13103.52117.33-1.57FFIV ahead
2025-01-10103.49116.94-1.54FFIV ahead
2025-01-08104.30119.02-1.70FFIV ahead
2025-01-07103.82118.31-1.69FFIV ahead
2025-01-06103.54119.41-1.88FFIV ahead
2025-01-03103.70116.96-1.56FFIV ahead
2025-01-02104.12115.76-1.36FFIV ahead
2024-12-31104.30115.63-1.33FFIV ahead
2024-12-30104.28116.09-1.41FFIV ahead
2024-12-27105.02117.54-1.50FFIV ahead
2024-12-26105.67118.23-1.50FFIV ahead
2024-12-24105.44117.80-1.50FFIV ahead
2024-12-23103.91116.98-1.62FFIV ahead
2024-12-20103.10115.99-1.63FFIV ahead
2024-12-19101.53115.14-1.76FFIV ahead
2024-12-18101.36115.87-1.91FFIV ahead
2024-12-17103.10119.46-2.13FFIV ahead
2024-12-16102.80121.10-2.42FFIV ahead
2024-12-13103.28120.38-2.28FFIV ahead
2024-12-12103.68120.27-2.24FFIV ahead
2024-12-11103.22119.58-2.25FFIV ahead
2024-12-10103.45117.53-1.97FFIV ahead
2024-12-09103.86118.59-2.07FFIV ahead
2024-12-06105.51118.24-1.79FFIV ahead
2024-12-05105.74118.19-1.77FFIV ahead
2024-12-04105.04116.85-1.72FFIV ahead
2024-12-03104.79115.47-1.58FFIV ahead
2024-12-02104.70115.94-1.67FFIV ahead
2024-11-29104.32115.11-1.63FFIV ahead
2024-11-27104.46114.99-1.61FFIV ahead
2024-11-26104.99115.84-1.66FFIV ahead
2024-11-25103.49114.37-1.70FFIV ahead
2024-11-22103.15113.56-1.66FFIV ahead
2024-11-21101.41112.33-1.77FFIV ahead
2024-11-20101.30111.28-1.65FFIV ahead
2024-11-19100.44110.20-1.64FFIV ahead
2024-11-18100.97110.35-1.59FFIV ahead
2024-11-15101.23109.60-1.43FFIV ahead
2024-11-14102.04111.30-1.55FFIV ahead
2024-11-13104.26113.51-1.51FFIV ahead
2024-11-12103.44112.19-1.45FFIV ahead
2024-11-11103.29111.58-1.38FFIV ahead
2024-11-08102.29110.96-1.43FFIV ahead
2024-11-07102.33111.22-1.45FFIV ahead
2024-11-06101.96110.41-1.38FFIV ahead
2024-11-0598.94107.10-1.37FFIV ahead
2024-11-0498.36106.31-1.34FFIV ahead
2024-11-0197.78106.77-1.47FFIV ahead
2024-10-3196.49107.54-1.73FFIV ahead
2024-10-3097.94109.87-1.81FFIV ahead
2024-10-2998.10110.51-1.86FFIV ahead
2024-10-2897.39100.40-0.76FFIV ahead
2024-10-2598.2099.72-0.58FFIV ahead
2024-10-2498.5998.20-0.35near the usual relationship
2024-10-2399.1599.05-0.39near the usual relationship
2024-10-2299.7299.81-0.42near the usual relationship
2024-10-2199.70100.22-0.47near the usual relationship
2024-10-18100.00100.00-0.42near the usual relationship

One-day company-specific moves (4+ standard deviations, which block ideas for 10 sessions): Oct 29, 2024 (CSCO +0.7%, FFIV +10.1%); Jan 29, 2025 (CSCO +0.2%, FFIV +11.4%); Oct 16, 2025 (CSCO -0.6%, FFIV -10.7%); Oct 28, 2025 (CSCO +1.7%, FFIV -7.9%); May 14, 2026 (CSCO +13.4%, FFIV +2.0%). Upcoming earnings: FFIV Oct 27, 2026 (after-hours).

Paired trades

The shared paper book and the replay, kept apart

Forward paper record

No paper position on this pair yet.

Historical simulation (a diagnostic, same rules)

1 simulated trade to Oct 20, 2026: -12.50% per trade on average after costs, 0 won.

LegsEnteredExitedWhyDaysBefore costsCosts + borrowAfter costs
Long FFIV · Short CSCONov 18, 2022Mar 14, 2023divergence stop116-$1,094.43-$68.26-$1,249.72 (-12.50%)

Per $10,000 a leg. A replay on today's companies cannot prove an edge.

The companies

CSCO and FFIV at a glance

CSCO Cisco Systems Inc. Common Stock (DE)

Listing
Nasdaq · SEC CIK 858877
Industry
Computer Communications Equipment · SIC 3576 Computer Communications Equipment
Market value
$419.9B
Price history
2,521 daily closes, Oct 12, 2016 to Oct 22, 2026

FFIV F5 Inc.

Listing
Nasdaq · SEC CIK 1048695
Industry
Computer Communications Equipment · SIC 3576 Computer Communications Equipment
Market value
$25.5B
Price history
2,521 daily closes, Oct 12, 2016 to Oct 22, 2026

Daily prices: Nasdaq.com. Filings and industry codes: SEC EDGAR. Earnings dates: Nasdaq earnings calendar.

Related
All pairs →
PairStatusAhead nowIndustry
ANET / FFIVWatchlistFFIV by 1.95 sdComputer Communications Equipment
CSCO / ANETWatchlistneitherComputer Communications Equipment

Follow the research behind the paper book

Boostio is a research-first platform in private beta: crypto candidates, daily market stories, public paper trading and now rival stocks. Exploring these pages stays free and open.

Explore the private beta

Paper only: hypothetical paired positions with modelled costs. No broker, no orders, no real money. A historical simulation is a diagnostic, not proof of an edge. Not investment advice.