Key Highlights

  • KLA (NASDAQ:KLAC) rose about 3% after hours on October 28, 2026 after guiding fiscal second-quarter revenue to USD 4.70 billion, plus or minus USD 200 million, about 4.7% above a USD 4.487 billion consensus.
  • NXP (NASDAQ:NXPI) rose 5.7% after hours following its third-quarter results. The cause was not confirmed, and no figures were retrieved, though SK hynix ADR rose 13.3% in a strong chip session in the same period.
  • F5 (NASDAQ:FFIV) closed down 20.43% after guiding fiscal 2027 revenue growth to 8% to 9% from 11%. A Piper Sandler downgrade was reported, but the rating and target were not captured in the material reviewed.
  • CoStar Group (NASDAQ:CSGP) fell 14% to 15% despite third-quarter revenue of USD 952 million, up 14%. One account says guidance was raised and another says it was weak, so the cause is not confirmed.

KLA (NASDAQ:KLAC): Guide above consensus

KLA (NASDAQ:KLAC) reported on October 28, 2026 and guided fiscal second-quarter revenue to USD 4.70 billion, plus or minus USD 200 million. That range runs from USD 4.50 billion to USD 4.90 billion, and even the low end sits just above the USD 4.487 billion consensus quoted in the account. Earnings per share guidance was USD 1.44 against a USD 1.36 consensus. The shares rose about 3% after hours. The data are verified in one account only, and the results for the quarter just reported were not retrieved, so this article concentrates on the forward guidance, which is what drove the move. Guidance is a forecast, so it can be revised in later quarters, up or down. Companies that make inspection and process-control tools for chip factories sell into capital spending plans, so their next-quarter guidance is read as a signal of how much chipmakers intend to invest in new equipment and in yield improvement for existing lines. Guidance above consensus tells analysts to raise estimates, which usually lifts the share price at once, while guidance below does the reverse. The reaction here arrived within a wider chip rally: SK hynix ADR rose 13.3% and Vertiv rose 16.5% in the same period, while Marvell fell 9.4% on reported talks with Lumentum.

NXP (NASDAQ:NXPI): Chip rally and unconfirmed cause

NXP (NASDAQ:NXPI) rose 5.7% after hours on October 28, 2026, and Garmin fell 4.65%. The account behind the move ties NXP to its third-quarter results and Garmin to a filing made on the same day. The price moves are confirmed, but the causes are not verified, and no numbers from either company were retrieved. That means this article cannot say whether NXP beat analyst estimates, whether it gave guidance, or what the Garmin filing contained. It reports the reaction and the timing, and it points to the company releases and the filing as the documents that carry the actual facts. Readers should also note that after-hours quotes come from thin trading and can differ across venues and minutes. Semiconductor suppliers sell to carmakers, industrial and mobile customers, so their results are read as a gauge of those end markets. A filing, by contrast, can cover almost anything: an earnings statement, an executive change, a financing or a legal matter. The first risk is that the causes are guesses: a 5.7% rise driven partly by sector momentum can fade if the chip rally weakens. Nasdaq-100 futures were down 1.2% at 4:09 a.m. ET on October 29, 2026, and Marvell fell 9.4% on reported talks with Lumentum, which shows how quickly sentiment can turn.

F5 (NASDAQ:FFIV): Growth outlook cut

F5 (NASDAQ:FFIV) said in its company release that it expects fiscal 2027 revenue growth of 8% to 9%, compared with 11% for the earlier period referenced in the material reviewed. The stock closed down 20.43% on October 28, 2026. Simple arithmetic shows the gap: on a base of 100, growth of 11% gives 111, while 8% to 9% gives 108 to 109. That is a revenue shortfall of about 2 to 3 points relative to the earlier pace, which compounds into the following year. The material reviewed did not give the dollar revenue guide, the earnings per share outlook or the quarterly results, so the full picture is incomplete. Investors pay for expected growth, so when F5 (NASDAQ:FFIV) lowers its growth outlook, the multiple the market applies to revenue and profit can compress even if the business remains profitable. A Piper Sandler downgrade, as reported, can amplify this because analysts reset estimates and some funds follow ratings. The mechanism is a feedback loop: lower guide, lower estimates, lower target multiples. The reviewed material did not say why growth is slowing, whether from customer spending, product mix or competition, so the cause behind the cut is not verified.

CoStar Group (NASDAQ:CSGP): Growth with a steep fall

CoStar Group (NASDAQ:CSGP) reported third-quarter revenue of USD 952 million, up 14%, according to the company release, and its shares fell 14% to 15% on October 28, 2026. Reversing the growth rate, the prior-year quarter was about USD 835 million, simple arithmetic on published numbers. The material reviewed did not give earnings per share, margins, cash flow or consensus estimates, so it is unclear whether the quarter beat or missed expectations. The mismatch between solid growth and a steep fall usually means something other than headline revenue disappointed, which makes the reaction harder to explain from the numbers alone. Without consensus numbers, it is not possible to say whether the market saw this as a shortfall. One account says CoStar Group (NASDAQ:CSGP) raised full-year guidance, while another points to weak revenue guidance. Guidance is management's forecast for future results, and markets often react more to a change in that forecast than to the quarter just reported. A raised full-year figure could still imply a slower fourth quarter, which is one way both descriptions might coexist, though that is conjecture. The only reliable way to settle it is to read the company release and guidance schedule directly, which was not available in the material reviewed.

Where Things Stand

The answer is that chip equipment and semiconductor names rose on results and guidance, while software and data names fell on guidance resets. KLA (NASDAQ:KLAC) guided above consensus. NXP (NASDAQ:NXPI) gained after results. F5 (NASDAQ:FFIV) cut its outlook. CoStar Group (NASDAQ:CSGP) sank on conflicting guidance accounts, and ServiceNow and Fortinet also fell after hours. Nasdaq-100 futures were down about 1.2% at 4:09 a.m. ET on October 29, so the tone toward technology remained fragile. This is not investment advice.